PEDS 2011 Conference Prog ramme 2 IEEE PEDS 2011 Conference Programme Schedule 5 December (Mon) 6 December (Tue) 7 December (Wed) 8 December (Thur) 0900 - 1040 HSSS-I MDMC-II

The 9th IEEE International Conference on

Power Electronics and Drive Systems IEEE PEDS 2011

The Amara Hotel, Singapore

5 – 8 December 2011

IEEE PEDS 2011 Conference Programme 1

The 9th IEEE International Conference on

Power Electronics and Drive Systems

IEEE PEDS 2011

The Amara Hotel, Singapore

5 – 8 December 2011

Conference Programme


IEEE PEDS 2011 Conference Programme Schedule

5 December

(Mon)

6 December

(Tue)

7 December

(Wed)

8 December

(Thur)

0900 - 1040

HSSS-I

MDMC-III

DGSG-I

RET-I

PIC-I

MDMC-V

APEHIA-I

RET-III

Tea Break Tea Break

1100 - 1240

Opening

Ceremony and

Plenary Session PSPC-I

MDMC-IV

DGSG-II

RET-II

SMPS-I

ADEM-I

APEHIA-II

RET-IV

Lunch Lunch Lunch

1400 - 1540

PEET-I

MDMC-I

PQHS-I

APEPSG -I

1400 – 1405 Set up

1405 – 1500 PS-I

SMPS-II

APEHIA-III

Tea Break Tea Break Tea Break

1600 - 1740

Tutorials and

Conference

Registration

MSPE-I

MDMC-II

PQHS-II

APEPSG -II

1520 – 1525 Set up

1525 – 1630 PS-II

1630 – 1650 Announcement

PEDS 2013 Ballroom I

1800 - 1930

Welcome Reception

1700 – 2100

Conference Dinner

ADEM-I: Analysis and Design of Electrical Machines I APEHIA-I: Applications of Power Electronics in Home Appliance, Industry and Aerospace I APEHIA-II: Applications of Power Electronics in Home Appliance, Industry and Aerospace II APEHIA-III: Applications of Power Electronics in Home Appliance, Industry and Aerospace III APEPSG-I: Applications of Power Electronics in Power System and Generation/FACTS I APEPSG -II: Applications of Power Electronics in Power System and Generation/FACTS II DGSG-I: Distributed Generation and Smart-Grid I DGSG-II: Distributed Generation and Smart-Grid II HSSS-I: Hard-Switching and Soft-Switching Static Power Converters I MDMC-I: Motion Drives and Motion Control I MDMC-II: Motion Drives and Motion Control II MDMC-III: Motion Drives and Motion Control III MDMC-IV: Motion Drives and Motion Control IV

MDMC-V: Motion Drives and Motion Control V MSPE-I: Modelling & Simulation in Power Electronics I PEET-I: Power Electronic Emerging Technologies I PIC-I: Power Integrated Circuits I PQHS-I: Power Quality Issues, Harmonic Problems and Solutions I PQHS-II: Power Quality Issues, Harmonic Problems and Solutions II PS-I: Poster Session I PS-II: Poster Session II PSPC-I: Power Semiconductors, Passive Components and Packaging Technologies I RET-I: Renewable Energy Technologies I RET-II: Renewable Energy Technologies II RET-III: Renewable Energy Technologies III RET-IV: Renewable Energy Technologies IV SMPS-I: Switch-Mode Power Supplies and UPS I SMPS-II: Switch-Mode Power Supplies and UPS II


Welcome Message from Conference Chairman

With the exponential growth of energy usage, rapid depletion of fossil-fuel and rising cost of non-renewable energy resources, the energy security and access, the environmental impacts of energy usage and at the same time with distributed and clean energy generation becoming widespread and important. Power Electronics is the enabling technology that deals with the conversion and control of electrical energy and supports a wide range of application energy related areas such as transportation, power supplies, renewable energy, energy harvesting, energy scavenging, lighting, displays, photovoltaics, wind turbines, fuel cell, and energy saving systems etc. In view of the growing importance of power electronic technology, the international biennial conference on Power Electronics and Drive Systems was originated in Singapore in 1995. Since then the PEDS Conference series has been running successfully on a biennial basis in the Asia and Pacific region. I am happy that it has come back to Singapore almost after an interval of 8 years (the last one held in Singapore was in 2003) and will be the 9th PEDS Conference. It tries to bring together professionals and executives in the power electronics and electric drives and energy sector, electrical power companies, manufacturing industries, research institutes and educational bodies to share and exchange ideas and information pertaining to power electronics and electric drive technologies. In the 3-day technical sessions, we will have 216 paper presentations coming from 38 countries. Besides technical paper presentations, there will also be one full-day for tutorials with four different topics, a plenary keynote session and an exhibition. Singapore is only one of two cities in the world to have a significant area of primary rainforest (at the Bukit Timah Hill) within its boundaries. The walk in the rain forest can be a relaxing experience. Or, another good choice will be to visit the National Orchid Garden, which is perhaps the best orchid garden in Singapore. With its friendly and welcoming people, state-of-the-art infrastructure and something new happening almost every day, Singapore will definitely provide an enjoyable experience during your stay. We hope you enjoy the visit to Singapore and have a pleasant conference.

Sanjib K. Panda

Conference Chairman


Message from Technical Programme Chairman

Power Electronics as a cutting edge technology has come a long way since the first PEDS conference in 1995. Although it may be now regarded as a mature technology, there are still many areas where improvements and innovations are frequently produced. These are in many ways due to the up-tick in applications such as renewable energy systems, smart grids, electro-mobility and green buildings. Hence it is important for power electronics conferences such as the PEDS to continue to provide regular forums for industrial and academic researchers to report their latest contributions to knowledge capital in power electronics and drives systems, and to network with each other. PEDS has returned to its venue of origin of Singapore in 2011, and I am pleased to serve as its Technical Program Chair again. We look forward to the presentations of over 200 high quality papers in the 3-day conference. The technical program is made possible through the hard work of the numerous peer reviewers and I would like to take this opportunity to thank all of them. Most of all, I should also thank and congratulate all the authors of these papers, many of them have been loyal and consistent supporters of the PEDS series of conferences. I wish all PEDS-2011 conference delegates an enjoyable experience in this Uniquely Singapore. King-Jet Tseng

Technical Programme Chairman


Conference Committee

General Chairman

Sanjib K. Panda (NUS)

Conference Advisory Board

Norbert Cheung (Hong Kong)

Yanuarsyah Haroen (Indonesia)

Sukumvit Phoomvuthisarn (Thailand)

Zainal Salam (Malaysia)

Tian-Hua Liu (Taiwan)

General Co-Chairman

Fai Choy Leong (SP)

Secretary

Yung C. Liang (NUS)

Treasurer

Dilip V. Battul (SP)

Technical Programme Chairman

King Jet Tseng (NTU)

Publication Chairman

Sanjib K. Sahoo (NUS)

Tutorial Chairman

Akshay K. Rathore (NUS)

International Panel Members

P. Acarnley, UK Hirofumi Akagi, Japan J. Marcos Alonso, Spain Gehan A. J. Amaratunga, England Ashoka Bhat, Canada D. Boroyevich, USA B. K. Bose, USA C. C. Chan, Hong Kong Henry Chung, Hong Kong J. C. Clare, UK Francis P. Dawson, Canada Deepak Divan, USA Malik E. Elbuluk, USA Prasad Enjeti, USA Bulent Ertan, Turkey A. J. Forsyth, UK Hideaki Fujita, Japan T. C. Green, England Yanuarsyah Haroen, Indonesia Boyong He, China Hiang-Kwee Ho, Singapore J. Holtz, Germany Qin Huang, Alex, USA R. S. Y. Hui, Hong Kong Iqbal Husain, USA Thomas M. Jahns, USA Praveen Jain, UK K. Jezernik, Slovenia M. K. Kazimierczuk, USA Ralph Kennel, Germany J. Kolar, Switzerland Matsuse Kouki, Japan Jason Lai, USA Loi Lei Lai, UK

Yung C. Liang, Singapore Yi-Lu Liu, USA Pascal Lorenz, France Robert D. Lorenz, USA

Bobuyuki Matsui, Japan Bed Mohan, USA M. Bakaoka, Japan Chem Bayar, Australia T. Binomiya, Japan Shigeru Okuma, Japan Dr. S. Paramasivam, India Z. Qian, China Dierk Schroeder, Germany H. Sekiya, Japan P.C. Sen, Canada Jul-Ki Seok, Korea M. Shoyama, Japan T. Suetsugu, Japan Seung-Ki Sul, Korea Ooi Boon Teck, Canada Paolo Tenti, Italy Tore M. Undeland, )orway Don Mahinda Vilathgamuwa, Singapore Lixiang Wei, USA Bin Wu, Canada J. Daan Van Wyk, USA Dehong Xu, China Dian Guo Xu, China Longya Xu, USA Abdul Halim Bin Mohamed Yatim, Malaysia Zhengming Zhao, China Georges Zissis, France Udaya Madawala, )ew Zealand John Y. Hung, USA


Tutorial Sessions

Date/Time: Monday, 5 December 2011 / 9:00am – 12:00pm

Tutorial 1: Design and Analysis of Bi-directional Inductive Power Transfer Systems

Dr. Udaya K. Madawala and Dr. Duleepa Thrimawithana

Department of Electrical & Computer Engineering

The University of Auckland, )ew Zealand

Abstract

Over the past decade, Inductive Power Transfer (IPT) technology has evolved into a state, where it is now

recognized as an efficient and reliable technique for transferring power across an air-gap through very weak

magnetic coupling. As many industrial and domestic applications require power with no physical contacts,

IPT technology is gaining global popularity and wide acceptance for numerous applications over a wide

power range. IPT is safe, and ideal for supplying power in hostile environments being unaffected by dust or

chemicals or water. It offers the advantages of high efficiency, typically about 85-90%, robustness and high

reliability. In the past many IPT systems with various circuit topologies, var compensation strategies and

levels of sophistication in control have been proposed and successfully implemented for applications, which

range from very low power bio-medical implants to high power battery charging systems. However, these

IPT systems have specifically been designed and optimized for applications that require only uni-directional

power flow or power transfer across an air-gap only in one direction and, hence, are not suitable for

applications that require bi-directional power transfer. Bi-directional IPT systems are ideal for applications,

such as electric vehicles used for ‘living and mobility’ and vehicle-to-grid systems, which require both

storage and retrieval of energy with no physical contacts

This is an introductory tutorial for bi-directional IPT systems. Different compensation strategies and control

concepts employed in typical bi-directional IPT systems are described in the tutorial with design examples.

Participants are expected to gain valuable knowledge in relation to theory, analysis and design of

bidirectional IPT Systems.

Biography

Udaya K. Madawala (Senior Member IEEE) graduated with B. Sc. (Electrical Engineering) (Hons) from

The University of Moratuwa, Sri Lanka in 1987 and received his PhD (Power Electronics) from The

University of Auckland, New Zealand in 1993. He was employed by Fisher & Paykel Ltd, New Zealand as a

Research and Development Engineer in 1993, and he joined the Department of Electrical and Computer

Engineering at The University of Auckland, New Zealand, as a Research Fellow and worked on various

energy related power electronics projects. At present, he is a full-time Associate Professor, and serves as an

Associate Editor for IEEE Transactions on Industrial Electronics, IEEE Transactions on Power Electronics

and International Journal on Industrial Electronics and Motor Drives. He is a member of the Power

Electronics Technical Committee and the Chairman of the sub-committee of Power Electronic Converters of

the IEEE Industrial Electronic Society, and also the Chairman of the Joint Chapter of IEEE Industrial

Electronics and Industrial Applications Society, New Zealand (North). He has more than 130 international

journal and conference publications and 4 patents. His research interests are in the fields of renewable or


green energy, power electronics and inductive power transfer, and he works as a consultant to industry in

these fields.

Biography

Duleepa J. Thrimawithana (Member IEEE) graduated with B. E. (Electrical Engineering) (1st Class Hons.)

from The University of Auckland, New Zealand in 2005. He received his PhD (Power Electronics) from the

same university in 2009. From 2005 to 2008 he worked, in collaboration with Tru-Test Ltd, New Zealand as

a research engineer in the areas of power converter and high voltage pulse generator design. In 2008 he

joined the Department of Electrical and Computer Engineering at the University of Auckland as a part-time

lecturer. During this time he worked in collaboration with the Department of Energy Technology, Aalborg

University, Denmark and was involved in modeling of micro-grids and vehicle to grid interface systems. At

present he is working as a lecturer at the Department of Electrical and Computer Engineering, Auckland

University of Technology, New Zealand. His main research areas are in the fields of inductive power transfer

systems and power electronic converters that are suitable for green energy applications.

Tutorial 2: Predictive Control - A Simple and Powerful Method to Control Power Converters and

Drives

Dr. Ralph Kennel1, Dr. José Rodríguez

2 and Dr. Patricio Cortés

2 1Technische Universitaet Muenchen Lehrstuhl für Elektrische Antriebssysteme und

Leistungselektronik Arcisstr. Germany. 2Departamento de Electrónica Universidad Técnica Federico Santa María, Chile.

Abstract

Up to now the control of electrical power using power converters has been based on the principle of mean

value, using pulse width modulation with linear controllers in a cascaded structure. Recent research works

have demonstrated that it is possible to use Predictive Control to control electrical energy with the use of

power converters, without using modulators and linear controllers. This is a new approach that will have a

strong impact on control in power electronics in coming decades.

The main advantages of predictive control are:

• Concepts are very intuitive and easy to understand.

• It can be applied to a great variety of systems.

• The multivariable case can be easily considered.

• Dead times can be compensated.

• Easy inclusion of non-linearities in the model.

• Simple treatment of constraints.

• The resulting controller is easy to implement.

• This methodology is open to include modifications and extensions depending on specific

applications.

The participants of this tutorial will learn:

• The basic concepts and ideas.

• Different types of predictive controllers.

• Detailed examples of predictive controllers.


• Several applications in different converter topologies.

Biography

Ralph M. Kennel was born in 1955 at Kaiserslautern (Germany). In 1979 he got his diploma degree and in

1984 his Dr.-Ing. (Ph.D.) degree from the University of Kaiserslautern. From 1983 to 1999 he worked on

several positions with Robert BOSCH GmbH (Germany). Until 1997 he was responsible for the development

of servo drives. Dr. Kennel was one of the main supporters of VECON and SERCOS interface, two multi-

company development projects for a microcontroller and a digital interface especially dedicated to servo

drives. Furthermore he took actively part in the definition and release of new standards with respect to CE

marking for servo drives. Between 1997 and 1999 Dr. Kennel was responsible for “Advanced and Product

Development of Fractional Horsepower Motors” in automotive applications. His main activity was preparing

the introduction of brushless drive concepts to the automotive market. From 1994 to 1999 Dr. Kennel was

appointed Visiting Professor at the University of Newcastle-upon-Tyne (England, UK). From 1999 - 2008 he

was Professor for Electrical Machines and Drives at Wuppertal University (Germany). Since 2008 he is

Professor for Electrical Drive systems and Power Electronics at the Technical University of Munich

(Germany). His main interests today are: sensorless control of AC drives, predictive control of power

electronics and Hardware-in-the-Loop systems. Dr. Kennel is a Senior Member of IEEE, a Fellow of IEE

and a Chartered Engineer in the UK. Within IEEE he is Treasurer of the Germany Section as well as Vice

President for Meetings of the Power Electronics society (PELS).

José Rodríguez received the Engineer degree from the Universidad Técnica Federico Santa Maria,

Valparaíso, Chile, in 1977, and the Dr.-Ing. degree from the University of Erlangen, Erlangen, Germany, in

1985, both in electrical engineering. Since 1977, he has been with the Department of Electronics Engineering,

University Técnica Federico Santa María, where he is currently a Professor. From 2001 to 2004, he was the

Director of the Department of Electronics Engineering. From 2004 to 2005, he served as Vice Rector of

academic affairs, and since 2005, he has been the Rector of the university. During his sabbatical leave in

1996, he was responsible for the Mining Division, Siemens Corporation, Santiago, Chile. He has extensive

consulting experience in the mining industry, particularly in the application of large drives such as

cycloconverter-fed synchronous motors for SAG mills, high-power conveyors, and controlled ac drives for

shovels and power quality issues. He has directed more than 40 R&D projects in the field of industrial

electronics. He has coauthored more than 300 journal and conference proceeding papers and contributed one

book chapter. His research group has been recognized as one of the two centers of excellence in engineering

in Chile from 2005 to 2008. His main research interests include multilevel inverters, new converter

topologies, and adjustable-speed drives. Prof. Rodríguez has been an active Associate Editor for the IEEE

Power Electronics and IEEE Industrial Electronics Societies since 2002. He has served as Guest Editor for

the IEEE Transactions on Industrial Electronics in six instances [Special Sections on Matrix Converters

(2002), Multilevel Inverters (2002), Modern Rectifiers (2005), High Power Drives (2007), Predictive Control

of Power Converters and Drives (2008) and Special Sections on Matrix Converters (2011),].

Patricio Cortés received the Engineer and M.Sc. degrees in electronic engineering from the Universidad

Técnica Federico Santa María (UTFSM), Valparaíso, Chile, in 2004. He received the Ph.D. degree at the

same university in 2008. In 2003, he joined the Department of Electronics Engineering, UTFSM, where he

currently is a Research Associate. His main research interests are control of power converters, predictive

control and adjustable speed drives.


Date/Time: Monday, 5 December 2011 / 2:00pm – 5:00pm

Tutorial 3: Cooperative and Hierarchical control of Intelligent Microgrids: Towards the Smartgrid

Dr. Josep M. Guerrero 1Institute of Energy Technology, Aalborg University, Denmark 2Technical University of Catalonia, Barcelona, Spain

Abstract

A Microgrid can be defined as a part of the grid with elements like distributed energy sources, power

electronics converters, energy storage devices and controllable local loads that can operate autonomously

islanded but also interacting with the main power network, in a controlled, coordinated way. In this tutorial,

the distributed control of these elements will be presented. Cooperative control and hierarchical control

schemes will be introduced to coordinate the power electronics converters of the Microgrid in order to

control the power flow and to enhance the power quality. The tutorial will be focused on analysis, modelling,

and control design of power electronics based Microgrids. Power electronics control and communications

will be emphasized. Further, the interconnection of Microgrid clusters will be shown as an approach towards

the Smartgrid.

Biography

Josep M. Guerrero (S’01–M’04–SM’08) was born in Barcelona, Spain, in 1973. He received the B.S.

degree in telecommunications engineering, the M.S. degree in electronics engineering, and the Ph.D. degree

in power electronics from the Technical University of Catalonia, Barcelona, Spain, in 1997, 2000 and 2003,

respectively. He is part time Associate Professor with the Department of Automatic Control Systems and

Computer Engineering, Technical University of Catalonia, where he currently teaches courses on FPGAs and

control of renewable energy systems. From 2011 he is a Full Professor at the Institute of Energy Technology,

Aalborg Universiy, Denmark, and responsible of the Microgrid research program. He has been a visiting

Professor at Zhejiang University, China, and University of Cergy-Pontoise, France. His research interests

include power electronics converters for distributed generation and distributed energy storage systems,

control and management of microgrids and islanded minigrids, and photovoltaic and wind power plants

control. He is an associate editor of the IEEE Transactions on Industrial Electronics and the IEEE

Transactions on Power Electronics. He currently chairs of Renewable Energy Systems Technical Committee

of IEEE IES. He is an elected IEEE IES Adcom member.

Tutorial 4: Wind Energy Conversion Systems

Professor Bhim Singh

FIEEE, F)AE, F)ASc, FIETE, FIE(I)

Department of Electrical Engineering, Indian Institute of Technology Delhi Hauz

Khas, )ew Delhi-110016, India.

Abstract

This tutorial will deal with the grid connected and standalone wind energy conversion systems (WECSs).

Starting from classification, configurations, state of art, design aspects, control algorithms, implementation,


performance, power quality aspects will be covered in grid connected WECS and off grid stand alone WECS

to provide good guidelines for easy selection of an appropriate configuration for specific conditions. These

WECSs will be discussed with different generators such as a squirrel cage induction generator (SCIG) and a

permanent magnet synchronous generator (PMSG) for grid connected WECS and in off-grid standalone

mode with a battery energy storage system (BESS) using one voltage source converter (VSC) for fixed speed

operation of WCES. The doubly fed induction generator (DFIG), SCIG, PMSG, permanent magnet brushless

DC generator (PMBLDCG), switched reluctance generator (SRG) using two VSCs in grid connected mode

and in off-grid standalone mode with a battery energy storage system (BESS) at the dc bus of two voltage

source converters (VSCs) will be covered for variable speed operation of these WCES. It is targeted to

provide broad perspective on WECS technology to the researchers, engineers and designers dealing with

them.

This tutorial will deal with the wind energy conversion systems (WECSs) classification, configurations, state

of art, design aspects, control algorithms, implementation, their performance, power quality aspects,

components selection considerations, latest trends, and future developments. A broad classification of

WECSs in two categories namely grid connected WECS and off grid standalone WECS is expected to be

good guidelines for easy selection of an appropriate configuration for specific conditions. A large number of

configurations of three-phase WECS will be discussed in grid connected and off grid standalone fixed speed

and variable speed operations of these WECS. These WECS will be discussed with different generators such

as squirrel cage induction generator (SCIG) and permanent magnet synchronous generator (PMSG) with grid

connected fixed speed operation of the WCES and doubly fed induction generator (DFIG), SCIG, PMSG,

permanent magnet brushless DC generator (PMBLDCG), switched reluctance generator (SRG) with grid

connected variable speed operation of these WECS using two voltage source converters (VSCs).

In off-grid standalone mode, these WECS will be covered with different generators such as squirrel cage

induction generator (SCIG) and permanent magnet synchronous generator (PMSG) with battery energy

storage system (BESS) at the dc bus of one VSC used for voltage and frequency control in fixed speed

operation of WCES. For variable speed operation of WCES, the doubly fed induction generator (DFIG),

SCIG, PMSG, permanent magnet brushless DC generator (PMBLDCG), switched reluctance generator (SRG)

will be discussed with a battery energy storage system (BESS) at the common dc bus of two voltage source

converters (VSCs) in off-grid standalone mode. In most of these WECS, the maximum power tracking will

be discussed to justify the use of power converters and advanced control algorithms. It is targeted to provide

broad perspective on WECS technology to the researchers, engineers and designers dealing with them. It is

hoped that this glimpse of WECS and their performance will be a useful reference to the designers, users,

manufacturers and researchers working on WECS dealing with power quality.

The tutorial will be three hours in duration and will consist of two parts. An outline is provided below.

Part 1: Latest Trends in Grid Interfaced Wind Energy Conversion Systems (1.5 Hour)

• Configurations of Grid Interfaced Wind Energy Conversion Systems.

• Design of Grid Interfaced Wind Energy Conversion Systems.

• Control Algorithms for Grid Interfaced Wind Energy Conversion Systems.

• Maximum Power Tracking in Grid Interfaced Wind Energy Conversion Systems.

• Performance of Grid Interfaced Wind Energy Conversion Systems.

• Comparative Study of Different Grid Interfaced Wind Energy Conversion Systems.

Part 2: Latest Trends in Standalone Wind Energy Conversion Systems (1.5 Hour)

• Configurations of Standalone Wind Energy Conversion Systems.


• Design of Standalone Wind Energy Conversion Systems.

• Control Algorithms for Standalone Wind Energy Conversion Systems.

• Maximum Power Tracking in Standalone Wind Energy Conversion Systems.

• Performance of Standalone Wind Energy Conversion Systems.

• Comparative Study of Different Standalone Wind Energy Conversion Systems.

Biography

Professor Bhim Singh received Bachelor of Engineering (BE) in Electrical Engineering degree from the

University of Roorkee, Roorkee, India, in 1977, and M.Tech. (Power Apparatus and Systems) and Ph.D.

degrees from Indian Institute of Technology (IIT) Delhi, India, in 1979 and 1983, respectively. In 1983, he

joined Department of Electrical Engineering, University of Roorkee, as a Lecturer. Where, he became a

Reader there in 1988. In December 1990, he joined Department of Electrical Engineering, IIT Delhi, New

Delhi, India, as an Assistant Professor. Where he has became an Associate Professor in 1994 and a Professor

in 1997. He has received Khosla Research Prize of University of Roorkee in the year 1991. He is recipient of

JC Bose and Bimal K Bose awards of The Institution of Electronics and Telecommunication Engineers

(IETE) for his contribution in the field of Power Electronics. He is also a recipient of Maharashtra State

National Award of Indian Society for Technical Education (ISTE) in recognition of his outstanding research

work in the area of Power Quality. He has received PES Delhi Chapter Outstanding Engineer Award for the

year 2006. He has been the General Chair of the IEEE International Conference on Power Electronics,

Drives and Energy Systems (PEDES’2006) held in New Delhi.

Prof. Singh has demonstrated a high level of leadership for more than 30 years in research, consulting and

innovative teaching. He has organized more than forty short term courses and workshops and has delivered

more than fifty invited specialized lectures including several memorial lectures. He has chaired many

international and national conferences / seminars and has delivered many special and state-of-art seminars.

Prof. Singh has guided 35 Ph.D. dissertations 110 ME/M.Tech./MS(R) theses and 60 BE/B.Tech. projects.

He has been granted one US patent and filed nine Indian patents. He has executed more than seventy

sponsored and consultancy projects. His fields of interest include power electronics, electrical machines,

electric drives, renewable energy generation, power quality, FACTS (Flexible Ac Transmission Systems),

HVDC (High Voltage Direct Current) transmission systems. Prof. Singh is a Fellow of the Indian National

Academy of Engineering (FNAE), The National Academy of Science, India (FNASc), Institution of

Engineers (India) (FIE), and Institution of Electronics and Telecommunication Engineers (FIETE) and a Life

Member of the Indian Society for Technical Education (ISTE), System Society of India (SSI), and National

Institution of Quality and Reliability (NIQR) and Fellow of Institute of Electrical and Electronics Engineers

(FIEEE).


Opening Ceremony

Date/Time: Tuesday, 06 December 2011/09:00 – 09:30 hrs Venue: Ballroom 2 Plenary Session

Date/Time: Tuesday, 06 December 2011/09:30 – 12:40 hrs Venue: Ballroom 2 Session Chair: Sanjib Kumar Panda, )ational University of Singapore, Singapore

324 A Shunt Current Control for Hybrid Power Source Consisting of EDLC and Battery in PMSM Drive )aomitsu Urasaki, Masaharu Iwasaki and Tomonobu Senjyu Japan

250 A Simple Voltage Control Method with Unity Displacement Power Factor for Four Leg

Indirect Matrix Converters Marco Rivera, I. Contreras, J. Rodriguez, R. Peña, J. Espinoza Chile

275 Monolithic RC-Snubber for Power Electronic Applications

Joachim vom Dorp, S.E. Berberich, T. Erlbacher, A.J. Bauer, H. Ryssel, L. Frey Germany

381 Investigation of the Circuit Parameters Design in a Power Converter by using High

Frequency Power Devices Kenta Watanabe, Jun-ichi Itoh Japan

Session PEET-I: Power Electronic Emerging Technologies I

Date/Time: Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue: Ballroom 2 Session Chair: Yen Kheng Tan, )anyang Technological University, Singapore 161 Torque and Flux Control of an Induction Machine fed by an Indirect Matrix Converter with

Instantaneous Reactive Power Minimization Operating under Unbalanced AC Supply Marco Rivera, Jose Rodriguez, Johann Kolar, Jose Espinoza Chile

206 SHE-PWM Control for Asymmetrical Hybrid Multilevel Flying Capacitor and H-bridge Converter Mohamed Dahidah, Georgios Konstantinou, Vassilios Agelidis Malaysia

386 A New Quick Response Digital Modified PID Control LLC Resonant Converter for DC

Power Supply System Koji Murata, Fujio Kurokawa Japan

460 A P-Q Based Synchronization Technique for BiDirectional Inductive Power Transfer

System Duleepa J. Thrimawithana, Udaya K. Madawala, Michael )eath New Zealand


270 A Series-Resonant Half-Bridge Inverter for Induction Iron Appliances

)arongrit Sanajit, Anuwat Jangwanitlert Thailand

Session MDMC-I: Motion Drives and Motion Control I

Date/Time: Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue: Connection Room 1 Session Chair: Rastko Fišer, University of Ljubljana, Slovenia 72 HybridFuzzy Controller Optimization via SemiParallel GA for Servomotor Control

)ordin Saad, Oyas Wahyunggoro, Taib Ibrahim Malaysia

80 Voltage Vector Approximation Control of Multistage Multilevel Inverter Using Simplified Logic Implementation M. Menshawi, M. Abdul Kadir, S. Mekhilef Malaysia

93 Dynamic Model of Brushless DC Drive Using FE Method Based Characteristics

Burin Kerdsup and )isai H. Fuengwarodsakul Thailand

115 A New Flux Observer Based on Voltage Reconstruction for Threelevel DTC Inverter Yaofei Han, Xiaohong Fan, Zhangfei Zhao

China 122 Dynamic Model of Induction Machine with Faulty Cage in Rotor Reference Frame

Vanja Ambrozic, Klemen Drobnic, Rastko Fiser, and Mitja )emec Slovenia

Session PQHS-I: Power Quality Issues, Harmonic Problems and Solutions I

Date/Time: Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue: Connection Room 2 Session Chair: Josep M. Guerrero, Aalborg University, Denmark

66 Generalized Unified Power Quality Conditioner for Compensating Current and Voltage

Imperfections Bahr Eldin S. M, K. S. Rama Rao, ). Perumal Sudan

251 Hierarchical Control Scheme for Voltage Harmonics Compensation in an Islanded Droop-

Controlled Microgrid Mehdi Savaghebi, Josep M. Guerrero, Alireza Jalilian, Juan C. Vasquez, Tzung-Lin Lee Islamic Republic Of Iran

130 Comparative Evaluation of Harmonic Compensation Capability of Active Power Filter with

Conventional and Bacterial Foraging Based Control Sushree Patnaik, Prof Anup Panda India


186 An Improvement of Synchronously Rotating Reference Frame Based Voltage Sag Detection for Voltage Sag Compensation Applications under Distorted Grid Voltages

Yutthachai Sillapawicharn, Yuttana Kumsuwan Thailand

Session APEPSG-I: Applications of Power Electronics in Power System and

Generation/FACTS I

Date/Time: Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue: Connection Room 4 Session Chair: Prafulla Chandra Panda, )ational Institute of Technology, Rourkela, Orissa, India

26 Gradient Approximation Based Maximum Power Point Tracking for PV Grid Connected System

Ahmed Abo khalil Egypt

273 Malfunction Analysis of SiC-SIT DC Circuit Breaker in 400V-DC Power Supply System

Seiya Abe, Sihun Yang, Masahito Shoyama, Tamotsu )inomiya, Akira Matsumoto, Akiyoshi Fukui Japan

145 A New Time Sharing Charge FC 5L Inverter

Masakazu Muneshima Japan

178 Distributed Generation using Indirect Matrix Converter in Boost Operating Mode

Xiong Liu, Poh Chiang Loh, Peng Wang, Frede Blaabjerg Singapore

209 Damping of Power System Oscillations using an Advanced Unified Power Flow Controller

Prafulla Chandra Panda, Jose P Therattil India

Session MSPE-I: Modelling & Simulation in Power Electronics I

Date/Time: Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue: Ballroom 2 Session Chair: Veerachary Mummadi, Indian Institute of Technology Delhi, )ew Delhi, India 466 Comparison of Zero-voltage-switching Current-fed Full-bridge and Half-bridge Isolated

Dc/Dc Converters with Active-clamp Akshay K Rathore, Xiaodong Li Singapore

154 Analysis and Compensation of the Output Voltage Imbalance in a Four Switch HalfBridge PFC Sheng-Yuan Ou,Chin-Tse Ho, Jui-Chih Li and Chung-Yen Yang Taiwan

448 Voltage mode Digital Controller For Single Switch Sixth-Order Boost Converter Veerachary Mummadi

India


Session MDMC-II: Motion Drives and Motion Control II

Date/Time: Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue: Connection Room 1 Session Chair: Pavel Vaclavek, Brno University of Technology, Czech Republic 155 Sensorless PMSM Drive System Based on Direct Torque Control in M–T Frame

Synchronized with Stator Flux-Linkage Vector Yukinori Inoue, Shigeo Morimoto, Masayuki Sanada Japan

190 Driving Performance Enhancement for SRM with Adaptive Learning Control of Critical Energized Parameters Shun-Chung Wang, Han-Bin Lin, Shao-Shan Chiang, Yi-Hua Liu, Yuan-Lin Chen, Kuei-Chiang Liang Taiwan

192 Performance Improvement of Induction Motor

Masayuki Morimoto Japan

195 A New Four-level Dual Inverter fed Open-end Winding Induction Motor Drive V.T.Somasekhar

India 223 Field Weakening Implementation in AC Induction Machine Predictive Control

Pavel Vaclavek, Petr Blaha Czech Republic

Session PQHS-II: Power Quality Issues, Harmonic Problems and Solutions II

Date/Time: Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue: Connection Room 2 Session Chair: Chung-Ming Young, )ational Taiwan University of Science and Technology,

Taiwan

124 Analysis of dv/dt Filter Installation for PWM AC Drive Applications Pravit Mart-ro, Warachart Sae-Kok, Surin Khomfoi Thailand

451 A Half-Bridge Inverter Based Active Power Quality Compensator with a DC Voltage

Balancer for Electrified Railways Toshihiko Tanaka, Tint Soe Win, Masayuki Okamoto, Eiji Hiraki Japan

346 Transformerless Single-Stage High Step-Up AC-DC Converter Based on Symmetrical

Cockcroft-Walton Voltage Multiplier with PFC Chung-Ming Young, Ming-Hui Chen, Hong-Lin Chen, Jen-Yi Chao, Chun-Cho Ko Taiwan

382 Nonlinear load compensation in Fuel Cell grid interfaced system using active power filter

G. Mehta, S. P. Singh, R. D. Patidar India


398 A study on the harmonic issues at CSIRO Microgrid Yang Du, Dylan Dah-Chuan Lu, David Cornforth ,Geoffrey James Australia

Session APEPSG-II: Applications of Power Electronics in Power System and

Generation/FACTS II

Date/Time: Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue: Connection Room 4 Session Chair: King Jet Tseng, )anyang Technological University, Singapore

513 Measurement and Simulation of Grounding Resistance with Two and Four Mesh Grids Md. Abdus Salam, Koh Ming Jen, Md. Ayub Khan

Brunei Darussalam 319 Transient Stability Enhancement of SMIB System using PSS and TCSC-Based Controllers Rajendraprasad )arne, P.C. Panda, Jose. P. Therattil

India 342 New Artificial Neural Network based Direct Virtual Torque Control and Direct Power

Control for DFIG in Wind Energy System Dzung Phan Quoc, Anh )guyen Bao, Hong Hee Lee Viet Nam

402 Variable Speed Pumping in Thermal and Nuclear Power Plants: Frequency Converter versus

Hydrodynamic Coupling Martin Sirovy, Zdenek Peroutka, Jan Molnar, Jan Michalik, Miroslav Byrtus Czech Republic

406 Microcontroller based Grid Connected Inverter for Axial Flux Permanent Magnet Generator Poonsri Wannakarn and Vijit Kinnares

Thailand

Session HSSS-I: Hard-Switching and Soft-Switching Static Power Converters I

Date/Time: Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue: Ballroom 2 Session Chair: D. Mahinda Vilathgamuwa, )anyang Technological University, Singapore 472 Analysis and Design of Zero Voltage Switching Current-Fed Isolated Full-Bridge Dc/Dc

Converter Prasanna UR, Akshay K Rathore Singapore

68 The Design and Implementation of LLC Resonant Half bridge Converter with Natural

Interleaved Power Factor Correction chinyuan hsu Jian-Ting Lai Ming-Che Lin Ming-Kai Yang Ming-Jyun Li Ren-Wei Huang Taiwan

377 PWM Strategy of Bi-Directional Buck AC/DC Converter for Reducing Output Voltage

Ripple Yuki Onoe, Wataru Kitagawa and Takaharu Takeshita Japan


334 A Multilevel Voltage Source Inverter Using H-Bridge and Two-Level Power Modules with a Single Power Source Suroso, Toshihiko )oguchi Indonesia

459 Multi-cell Transzsource Inverters

Ding Li, Poh Chiang Loh, Miao Zhu, Feng Gao, Frede Blaabjerg Singapore

Session MDMC-III: Motion Drives and Motion Control III

Date/Time: Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue: Connection Room 1 Session Chair: Sanjib Kumar Panda, )ational University of Singapore, Singapore

224 Implementation of Food Processor Application Using Brushless DC Motor Control Zu-Sheng Ho, Chii-Maw Uang, Ping-Chieh Wang, Sheng-Hao Liu

Taiwan 240 Exact Common-Mode and Differential-Mode Equivalent Circuits of Inverters in Motor

Drive Systems Taking into Account Input Rectifiers Pennapa Pairodamonchai, Somboon Sangwongwanich Thailand

262 A Low Computation Fractal Based Voltage Space Phasor Generation for a Four Level

Inverter using Open-end Winding Induction Motor Drive Shiny G, Baiju M.R.

India 263 A Space Vector Based Pulse Width Modulation Scheme for a 5-Level Induction Motor

Drive Shiny G, Baiju M.R. India

286 Design of a Lying Sensor for Permanent Magnet Synchronous Machine Torque Ripple

Reduction using the Iterative Learning Control Technique Yi YUA), Francois AUGER, Luc LORO), Franck DEBRAILLY, Mathieu HUBERT France

Session DGSG-I: Distributed Generation and Smart-Grid I

Date/Time: Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue: Connection Room 2 Session Chair: Sanjib Kumar Sahoo, )ational University of Singapore, Singapore

320 Operation Principle of Multiple DC Smart Grids Hayato Yamauchi, Masahiko Kina, Kyohei Kurohane, Kosuke Uchida, Atsushi Yona and Tomonobu Senjyu Japan

353 Optimum Operation Planning of Controllable Loads in Smart House

Kazuki Ogimi, Kenichi Tanaka, Kosuke Uchida, Atsushi Yona, Tomonobu Senjyu, Toshihisa Funabashi, Chul-Hwan Kim Japan


397 Evaluation of current reference generation methods for a three-phase inverter interfacing

renewable energy sources to generalized micro-grid Souvik Dasgupta, Shankar )arayan Mohan, Sanjib Kumar Sahoo, Sanjib Kumar Panda Singapore

421 A Novel Model to Determine Optimizing Power and Capacity for Energy Storage Systems

on Competitive Electricity Markets V. V. Thang, ). H. Kong, D. Q. Thong, B. Q. Khanh

Viet Nam 433 Grid interconnection of distributed generation system with power quality improvement

features G. Mehta, S. P. Singh, R. D. Patidar India

Session RET-I: Renewable Energy Technologies I

Date/Time: Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue: Connection Room 4 Session Chair: Bhim Singh, Indian Institute of Technology (IIT) Delhi, )ew Delhi, India

239 A Low-cost Photovoltaic Energy Harvesting Circuit for Portable Devices Ian Y.W. Chung, Yung C. Liang Singapore

395 Characteristics Evaluation and Parameter Extraction of a Solar Array based on Experimental

Analysis Bidyadhar Subudhi, Raseswari Pradhan India

159 Asynchronous Generator with Battery Storage for Standalone Wind Energy Conversion

System Shailendra Sharma and Bhim Singh India

163 Design and Dynamic Power Management of Energy Storage System for Wind Plant Duong Tran, Haihua Zhou, Ashwin Khambadkone

Singapore 75 Investigation of Power Converter Topologies for Solar Powered Hydrogen Reformer Wei Jiang, Job Brunet, Babak Fahimi

China

Session PSPC-I: Power Semiconductors, Passive Components and Packaging Technologies I

Date/Time: Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue: Ballroom 2 Session Chair: Yung C. Liang, )ational University of Singapore, Singapore

77 An On-Chip Current Sensing Technique for Hysteresis Current-Controlled Boost Converters M.L. Chiu and H.P. Chou

Taiwan


158 Analysis of Output Capacitor Parasitic Effects to Output Voltage Ripple on Power Converter Sheng-Yuan Ou, Huei-Fa Su and Cheng-Yu Tang Taiwan

288 A Novel Soft Switching Grid Connected PV Inverter and its Implementation

minjie chen Japan

492 Indirect Space Vector Modulated Three Phase AC-AC Matrix Converter Under Abnormal

Input Conditions )guyen Khanh Tu Tam, )ho )guyen, Huynh Thai Hoang Viet Nam

81 P-bury Region Effects on Breakdown Voltage of NPTTIGBT Structure

montree saenlamool Thailand

Session MDMC-IV: Motion Drives and Motion Control IV

Date/Time: Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue: Connection Room 1 Session Chair: Sanjib Kumar Sahoo, )ational University of Singapore, Singapore 308 An Improved SVMDTC based Induction Motor Drive Scheme using dSPACE

Mohan Krishna Reddy Matli, S. V. Jadhav, B. ). Chaudhari India

329 Design and Implementation of a Direct Torque Controlled Interior Permanent Magnet

Synchronous Motor Drive Based on a Novel Flux Model Lin Ming-Tsan Taiwan

442 Optimal control design for Switched Reluctance Machines with Right sized modeling

Yang Ji and Johann bals Germany

429 AC Induction Motor Control Using Robust Current Controllers

Petr Blaha, Pavel Václavek Czech Republic

Session DGSG-II: Distributed Generation and Smart-Grid II

Date/Time: Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue: Connection Room 2 Session Chair: Wei Jiang, Yangzhou University, Yangzhou, China

486 Review of Power Flow Studies on Distribution Network with Distributed Generation Balamurugan Karuppiah, Dipti Srinivasan

Singapore 202 Optimal Operation of Thermal Generating Units and Smart Houses

Tomonori Goya, Tomonobu Senjyu, Atsushi Yona, Kosuke Uchida, Toshihisa Funabashi, Chul-Hwan Kim


Japan 175 MultiAgent System for Demand Side Management in Smart Grid

Thillainathan Logenthiran; Dipti Srinivasan; Tan Zong Shun Singapore

214 Fuzzy Logic Controller based 3ph 4wire SHAF for Current Harmonics Compensation with

idiq Control strategy using Simulation and RTDS Hardware Suresh Mikkili, Anup kumar Panda

India 441 A Ubiquitous Power with DC Micro-Grid for Sectional Compact Emergency Shelters Keiichi Kato, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Fusanori Miura, Makoto

Koganei Japan

Session RET-II: Renewable Energy Technologies II

Date/Time: Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue: Connection Room 4 Session Chair: Guan-Chyun Hsieh, Chung Yuan Christian University, Taiwan

113 A Study of Fuel Cell ZSource Boost Converter: Considerations on Design and Implementation Hung-I Hsieh, Chin-Hao Chang and Guan-Chyun Hsieh Taiwan

120 Three-Phase Photovoltaic Grid-Connected Inverter using dSPACE DS1104 Platform Zamre Abd Ghani, M A Hannan, Azah Mohamed, Subiyanto

Malaysia 121 Analysis of Multi-power Sources Energy Management System for Electric Hybrid Vehicle MA Hannan, FA Azidin, A Mohamed

Malaysia 141 Deadbeat Current Control of LCL-Filter for Grid Connected Three-Phase Voltage Source

Inverter Katsumi )ishida Japan

74 Cooperative Control of Interfaced Inverter with PV System and Existing Voltage Control

Devices Considering Forecasted Error in Distribution System Masato Oshiro, Tomonobu Senjyu, Atsushi Yona, )aomitsu Urasaki, Toshihisa Funabashi, and Chul-Hwan Kim Japan

Session PS-I: Poster Session I

Date/Time: Wednesday, 07 December 2011/14:00 – 15:40 hrs Venue: Ballroom 2 Session Chair: Yen Kheng Tan, )anyang Technological University, Singapore

117 A Modular Matrix Converter for Transformer-less PMSG Wind Generation Systems S. D. Gamini Jayasinghe, D. Mahinda Vilathgamuwa


Singapore 84 Novel evaluation method for the volume of transformers with various magnetic cores Tomoyuki Hatakeyama, Kenichi Onda

Japan 407 Considerations about Sensorless Control of Permanent Magnet Synchronous Motors at low

speed and standstill for Wheel Mounted Drive of Tram David Uzel, David Vošmik, Zdenek Peroutka, Martin Sirový Czech Republic

102 A Novel Voltage-Boosting Converter Based on Charge Pumps with One Inductor Inserted K. I. Hwu, W. C. Tu, Jenn-Jong Shieh

Taiwan 103 A Simple Step-Up Converter

K. I. Hwu, Chun-Chen Lin, Jenn-Jong Shieh Taiwan

111 Applying Asymmetrical Half-Bridge LCC Resonant Inverter to EEFL Lighting Ballast

K. I. Hwu, W. C. Tu, Kuo-Yang Chen Taiwan

6 A Novel ZVS-ZCS Bidirectional Flyback DC-DC Converter for Low Power Application

V.V.Subrahmanya Kumar Bhajana, S.Rama Reddy, P.Chandra sekhar India

385 Direct Load Angle Control of Three Phase Induction Motor Drives

Sandepudi Rao India

59 A flexible dynamic behavior model of inductors to link time domain simulation with

empirical loss equations that is instantaneous dB/dt and B(t) dependent for Spice circuit simulation Long-Ching Yeh Taiwan

85 Modelling and Analysis of Multistage Switched-Capacitor-Voltage-Multiplier Boost DC-

AC Inverter Yuen-Haw Chang Taiwan

378 A Novel Sliding Mode Controller for Induction Motor DTC Drive with Smooth

Performance S.V.Jadhav, mohan krishna reddy matli, B.).Chaudhari India

92 A Novel Type Suppressed Noise Peak DcDc Boost Converter Introducing Deltasigma

Modulation Technique Atsushi Hirota, Kwon Soon, Satoshi )agai, Srawouth Chandhaket, Mutsuo )akaoka Japan


338 Comparative Analysis of Control Strategies for Modular Multilevel Converters Amel Lachichi, Lennart Harnefors Sweden

340 Constant Frequency Ripple Regulator Free from Sub-harmonic Oscillation

Shohei Hirose Taichi Kimura Terukazu Sato Takashi )abashima Kimihiro )ishijima Japan

432 Comparative Study of Digital PI Control Algorithm for Dc-to-dc converters

Takayuki Kuroki,Terukazu Sato, Kimihiro )ishijima, Takashi )abeshima Japan

458 An Isolated Bi-directional Soft Switching DC-DC Converter for Energy Storage System and

Its Voltage Stress Suppression Approach Kazumasa HIRAO, Masayuki OKAMOTO, Eiji HIRAKI, Toshihiko TA)AKA Japan

139 A SinglePhase to ThreePhase AC/AC Converter with Regeneration and Adjustable Power

Factor Jeng-Yue Chen, Tsung-Cheng Chen, Gwo-Jen Chiou, Hsien-Te Chiu, Chen-Chih Yang Taiwan

345 Experimental Verification of Online High Efficiency Control for a Weaving Machine ryo tateno Jun-ichi Itoh )oboru Saitoh

Japan 348 A Modified Three Dimensional Space Vector based PWM Method for Four-Leg Voltage

Source Inverter Fed Asymmetrical Two-Phase Induction Motor Heli Golwala, Chudamani R India

394 Unregulated Interface Converter Based on Cascaded Switched Capacitor Converters for

Supercapacitors in Alternative Battery Applications Masatoshi Uno Japan

21 Discussions of Resonant Bilateral Chopper Utilizing Zero Voltage Switches

Keiju Matsui, Takanori Asaba, Masaru Hasegawa Japan

435 A Hybrid Vehicle with Reversible Cell and Battery

Tetsuya Watanabe Japan

257 Classification of Home Appliance Electricity Consumption Using Power Signature and

Harmonic Features Shyh-Jier Huang, Cheng-Tao Hsieh, Lun-Chia Kuo, Chun-Wei Lin,Che-Wei Chang, and Shyang-An Fang Taiwan

58 Analysis of Transient Behavior of Class E Amplifier Due to Load Variations

Tadashi Suetsugu, Marian Kazimierczuk


Japan 341 An Equivalent Mathematical Model for Soft Starter of HighVoltage Asynchronous Motor Chu Jianxin, Gu Wei, Huang Hui

China 106 Sensorless Control of Surface Permanent Magnet Motor based on Model Reference

Adaptive System Masaki Ohara, Toshihiko )oguchi Japan

296 Design of the Laboratory Illumination and Practical Measurement by Integrating

Optimization of Power Usage Chin Chieh, Chu F. H., Huang S. C., YA)G H. Y. Taiwan

143 Direct Torque Control of Brushless Doubly-Fed Induction Machines Using Fuzzy Logic

S.Javad Fattahi, Amir A.Khayyat Islamic Republic Of Iran

191 Sliding Mode Control of a Feedback Linearized Induction Motor using TS Fuzzy Base

Adaptive Iterative Learning Controller Madhu Singh, Kanungo Barada Mohanty, Bidyadhar Subudhi India

233 Regenerative Braking Control for Light Electric Vehicles

Cheng-Hu Chen, Wen-Chun Chi, Ming-Yang Cheng Taiwan

361 Modelling of Battery Temperature Effect on Electrical Characteristics of Li-ion Battery for

Hybrid Electric Vehicle Yen Kheng Tan, Junchi Mao, King Jet Tseng Singapore

453 Comparative analysis of ANN and SSM controllers in a ZVCS-Full Bridge Series-Parallel

Resonant DC-DC Converter Zahra Malekjamshidi, Mohammad Jafari Islamic Republic Of Iran

414 A New Digital Control DCDC Converter with Repetition Neural Network Prediction Kimitoshi Ueno, Fujio Kurokawa, Hidenori Maruta, Hiroyuki Osuga

Japan 313 Sensorless Position Optimal Control Strategy of Brushless DC Motor

Zu-Sheng Ho, Chii-Maw Uang, Ping-Chieh Wang, Sheng-Hao Liu Taiwan

285 Current-Mode Sensorless Control of Single-Phase Brushless DC Fan Motors

Wei-Chao Chen and Ying-Yu Tzou Taiwan

491 A Novel Offset Based PWM Method For 3f AC-AC Matrix Converter


)ho-Van )guyen, Tam-Tu Khanh )guyen, Hoang Thai Huynh Viet Nam

234 Study on the Current Control Loop of PMSM Based on Sinusoidal Commutation

Tzu-Yu Liu, Cheng-Hu Chen, Wen-Chun Chi, Ming-Yang Cheng Taiwan

171 Seven-level Cascaded Inverter Based Shunt Active Power Filter in Four-wire Distribution

System Izzeldin Idris Abdalla, K. S. Rama Rao, ). Perumal Malaysia

187 A Buck Converter Using Accurate Synthetic Ripple Hysteresis Control Scheme

C.C. Chuang,H. P. Chou, and M.L. Chiu Taiwan

70 New DC Rail Side SoftSwitching PWM DCDC Converter with Current Doubler Rectifier Khairy Sayed Egypt 410 Grid-Connection Single-Stage Photovoltaic Inverter System with Double-Linear-

Approximation MPPT Chih-Lung Shen, Cheng-Tao Tsai, Jye-Chau Su and Yi Chan Taiwan

Session PS-II: Poster Session II

Date/Time: Wednesday, 07 December 2011/16:00 – 17:40 hrs Venue: Ballroom 2 Session Chair: Yung C. Liang, )ational University of Singapore, Singapore

71 A Digital Position Controller of Travelling Wave Ultrasonic Motors )guyen To Hieu, Shogo Odomari, Kosuke Uchida, Tomonobu Senjyu and Masato Oshiro Japan

483 Design Aspects and Test Results of a High Speed Bearingless Drive

Hubert Mitterhofer Wolfgang Amrhein Austria

208 Influence of Number of Poles, Magnet Arrangement and Current Density on Characteristics

of Inner and Outer Rotor PMSMs Yusuke Tani, Shigeo Morimoto, Masayuki Sanada Japan

291 New infinitesimal method for the calculation of self and mutual inductances of arbitrary AC windings Miroslav Patocka, Radoslav Cipin Czech Republic

292 Identification of the induction motor parameters based on the acceleration method

Radoslav Cipin, Miroslav Patocka Czech Republic

112 Three-Phase Boost Converter with Integrated Auxiliary Step-Up Circuit for Electric Vehicle Applications


Ching-Ming Lai, Ming-Ji Yang, Hou-Hsuan Chen Taiwan

258 Theoretical Study on EcoDriving Technique for an Electric Vehicle Considering Traffic

Signals Masafumi Miyatake, Motoi Kuriyama, Yuzuru Takeda Japan

326 SOH Estimation of Lead Acid Battery for Automobile

Kentaro Ushiyama Masayuki Morimoto Japan

416 Optimal Control of SinglePhase Voltage Source Active Rectifier with Emphasis on the

Minimal Electromagnetic Interference Jan Michalík, Martin Zeman, Vojtech Blahník, Zdenek Peroutka Czech Republic

28 A New Wind Turbine Simulator With Squirrel Cage Induction Motor for DFIG Wind Power

Generation Systems Ahmed Abo khalil Egypt

188 A Simple Rule-Based Approach for Detection and Classification of Voltage Sag, Swell, and

Interruption in Power Systems Cheng-I Chen, Hung-Lu Wang, Yuan-Chieh Chin

Taiwan 379 Performance Evaluation of a Low Power SolarPV Energy System with SEPIC Converter

)eha Adhikari,Bhim Singh, A.L. Vyas India

364 An Intelligent Current Limiter and Zero Active Power Injection Algorithm for Microgrid

Voltage Support Christopher Rowe Australia

238 Analysis and Comparison Study of PWM and PhaseShifted PWM FullBridge Inverter Fed High Voltage High Frequency Ozone Generator Prasopchok Hothongkham

Thailand 135 An Evaluation Method of Transformer Behaviors on Common-mode Conduction Noise in

SMPS Qingbin Chen, Wei Chen, Qingliang Song, Yongfa Zhu China

363 Small Signal Stability Analysis of Arctan Power Frequency Droop

Christopher Rowe Australia 104 Thermal Units Commitment Considering Voltage Constraint Based on Controllable Loads

Reactive Control in Smart Grid


Tomonori Goya, Tomonobu Senjyu, Atsushi Yona, )aomitsu Urasaki, Toshihisa Funabashi, Chul-Hwan Kim Japan

110 Energy Storage Systems for Seamless Mode Transfer in Microgrid

Che-Wei Chang, Yung-Ruei Chang Taiwan

203 Multiswitch Driving Circuit with LLC Resonant Circuit for High PulsedVoltage Generator Sheng Yu Tseng

Taiwan 199 Design and Implementation of a DSP Based Fast Charger for Li-ion Battery

Sheng-Yuan Ou, Jen-Hung Tian and Chung-Yen Yang Taiwan

254 A new DC/AC boost transformerless converter in application of photovoltaic power

generation Mo Wei, Loh Poh Chiang Andrew, Frede Blaabjerg Singapore

482 Coordinated Control of Multi-terminal DC Systems for Large-scale Wind Power

Transmission wenbo sun, yi wang, xiaorong zhu, xinchun shi China

332 Design of Plasma Power for an Atmospheric Pressure Dielectric Barrier Discharge Ji-

Yung Lee, Fu-Sheng Pai, Shyh-Jier Huang Taiwan

384 Digital Time-multiplexing Control of Single-switch Dual-Output DC/DC converter

Ting Sun, Dylan Dah-Chuan Lu Australia

274 The effect of Space Vector Modulation on Capacitor Voltage Ripple in a Cascaded H-bridge

StatCom Chris Townsend John Vodden Alan Watson Terry Summers Robert Betz Jon Clare Australia

309 Real-Time Load Compensation by Using a Cascaded Multilevel Inverter-Based STATCOM Wei-)eng Chang and Ching-Huan Liao

Taiwan 396 Transient Stability Enhancement Evaluation of Cogeneration System by Using FACTS

Elements Wei-)eng Chang and Chia-Han Hsu Taiwan

174 Intelligent Management of Distributed Storage Elements in a Smart Grid

Thillainathan Logenthiran, Dipti Srinivasan Singapore


125 A Novel Single Stage Step Up/Down AC/DC Converter for Small BLDC Wind Power Generators Ching-Tsai Pan, Ting-Yu Chang, Emily Fang Taiwan

323 Design of FRT Capability and Distributed Voltage Control of PV Generation System Hayato Yamauchi, Atsushi Yona and Tomonobu Senjyu

Japan 408 Improved performance of a novel SMC–Fuzzy controller for DTC brushless dc motor drive

for precise speed regulation Subba Rami Reddy, Surya Kalavathi India

343 The Optimization of Control Parameters of PSO based MPPT

Takayoshi Kamejima, Yuta Kondo, Phimmasone Vanxay Japan

347 The Implementation of Direct Virtual Torque Control and Direct Power Control for DFIG in

Wind Energy System Using DSpace 1103 Dzung Phan Quoc, Anh )guyen Bao, Phuong Le Minh, Khoa Le Dinh, Hong Hee Lee Viet Nam

255 Scaling Factor Design Issues in Variable Step Size Incremental Resistance MPPT in PV

systems Emad Ahmed Japan

356 A Novel MPPT Control Method of Thermoelectric Power Generation Using State Space

Averaging Method Hiroaki Yamada, Koji Kimura, Tsuyoshi Hanamoto, Toshihiko Ishiyama, Tadashi Sakaguchi, Tsuyoshi Takahashi Japan

370 Control of PMSG-Based Wind Turbines to Damp the System Power Oscillations

Xiangyu Zhang, Yi Wang, Heming Li China

373 Optimal Operation Planning of Wind Farm Using Wind Power Forecasted Data

Kazuki Ogimi, Kosuke Uchida, Atsushi Yona, Tomonobu Senjyu Japan

375 Control of MTDC-based Microgrid with Wind Turbines

Lirong Zhang, Heming Li, Yi Wang China

349 The New Combined Maximum Power Point Tracking Algorithm using Fractional

Estimation in Photovoltaic Systems Dzung Phan Quoc, Quang )guyen )hat, Phuong Le Minh, Khoa Le Dinh, Anh )guyen Bao and Hong Hee Lee Viet Nam


144 High Conversion Ratio Converter with ZVS Snubber Circuit for PV Charger Application Yuang-Shung Lee, Sian-Siou Huang, Wei-Yi Yang

Taiwan

Session PIC-I: Power Integrated Circuits I

Date/Time: Thursday, 08 December 2011/09:00 – 10:40 hrs Venue: Ballroom 1 Session Chair: K. I. Hwu, )ational Taipei University of Technology, Taiwan

99 High-Voltage Boost Converter K. I. Hwu, W. C. Tu Taiwan

101 Negative-Output Resonant Voltage Divider

K. I. Hwu, Y. T. Yau, Jenn-Jong Shieh Taiwan

100 Dual-Output Boost Converter

K. I. Hwu, Y. T. Yau, Jenn-Jong Shieh Taiwan

260 Integrated Ambient Light Sensor on a LED Driver Chip

Jian-fu Wu, Chia-Ling Wei, Yuan-Ta Hsieh, Chiao-Li Fang, Hann-Huei Tsai, Ying-Zong Juang Taiwan

237 A Carrier-Based PWM Strategy for Three-Level Neutral-Point-Clamped Voltage Source

Inverters Watcharin Srirattanawichaikul, Yuttana Kumsuwan, Suttichai Premrudeepreechacharn, Bin Wu Thailand

Session MDMC-V: Motion Drives and Motion Control V

Date/Time: Thursday, 08 December 2011/09:00 – 10:40 hrs Venue: Connection Room 1 Session Chair: D. Mahinda Vilathgamuwa, )anyang Technological University, Singapore

390 Direct Torque Control of Induction Motor Drives for Optimum Stator Flux and Torque Ripple Sandepudi Rao India

415 Fault Tolerant Control Method to Improve the Torque and Speed Response in PMSM Drive

with Winding Faults Chandana Jayampathi Gajanayake, Bicky Bhangu, Sivakumar )adarajan, and Gamini Jayasinghe Singapore

434 A Complete Bit-Stream Control System for Doubly Fed Induction Generator Applications Jonathan Bradshaw, Udaya Madawala, )itish Patel, Duleepa Thrimawithana

New Zealand


480 A Static TwoAxis Model and Its Application in Direct Torque Control System for Brushless Doubly Fed Induction Machine Ai-ling ZHA)G, Xin WA)G China

468 A Completely Smooth Transition Buck-Boost Converter with Continuity Mode (CM)

Technique for Only Using 2 Switches in Whole Battery Life KIA)-FU WO)G,Chien-Hung Tsai Taiwan

Session APEHIA-I: Applications of Power Electronics in Home Appliance, Industry and

Aerospace I

Date/Time: Thursday, 08 December 2011/09:00 – 10:40 hrs Venue: Connection Room 2 Session Chair: Shyh-Jier Huang, )ational Cheng Kung University, Tainan, Taiwan

67 Study and Implementation of a High Output Current Inverter with a Current Doubler Rectifier Sen-Tung Wu,jian-min wang,Yu-Kang Lo Taiwan

387 Design of a Digital Controlled Solar Water Pump Drive System for a Nanofilteration System Chuanlin Jin, Wei Jiang

China 205 Enhancement of Piezoelectric TransformerBased LED Lighting System with Tracking

Mechanism Shyh-Jier Huang, Tsong-Shing Lee Taiwan

211 Optimal Control Design Method for TransLinked Type MultiPhase Boost Converter Yuta )akamura, Masayoshi Yamamoto

Japan 267 Optimal Design of Digital Control System for Interleaved Boost Chopper Circuit with the

Coupled Inductor Kenta Kono, Yuta )akamura, Masayoshi Yamamoto Japan

Session RET-III: Renewable Energy Technologies III

Date/Time: Thursday, 08 December 2011/09:00 – 10:40 hrs Venue: Connection Room 4 Session Chair: Yie-Tone Chen, )ational Yunlin University of Science & Technology, Taiwan

157 Design and Implementation of a Hybrid Maximum Power Point Tracker in Solar Power System Cheng-Yu Tang, Sheng-Yuan Ou and Yu-Chun Su Taiwan

198 A New DSP-Based ZVT Photovoltaic Energy Conversion System

Yie-Tone Chen Taiwan


280 A MPPT Control Method for Stand-Alone Photovoltaic System in Consideration of Partial

Shadow Yuya Oshiro, Hikaru Ono, )aomitsu Urasak Japan

344 Verification of Efficacy of the Improved PSO-based MPPT Controlling Multiple

Photovoltaic Arrays vanxay phimmasone, Takayoshi Kamejima, Yuta Kondo, Masafumi Miyatake Japan

Session SMPS-I: Switch-Mode Power Supplies and UPS I

Date/Time: Thursday, 08 December 2011/11:00 – 12:40 hrs Venue: Connection Room 4 Session Chair: Ying-Yu Tzou, )ational Chiao Tung University, Taiwan

419 A DSP based bipolar switching power supply Yueh-Ru Yang Taiwan

438 Light Load Efficiency Improvement for AC/DC Boost PFC Converters by Digital Multi-

Mode Control Method Wei-Shung Wang and Ying-Yu Tzou Taiwan

201 Design and Implementation of Digital Controller using FPGA for 200kHz PWM Inverter Shinya Suzuki, Keiji Wada, and Toshihisa Shimizu

Japan 315 Bridgeless Power Factor Correction Circuits with Voltage-Doubler Configuration

Dylan Dah-Chuan Lu and Wenfei Wang Australia

180 Design, Simulation and Implementation of an Adaptive controller on base of Artificial

Neural Networks for a Resonant DC-DC Converter Mohammad Jafari, Zahra Malekjamshidi Islamic Republic Of Iran

Session ADEM-I: Analysis and Design of Electrical Machines I

Date/Time: Thursday, 08 December 2011/11:00 – 12:40 hrs Venue: Connection Room 1 Session Chair: Vanja Ambrožič, University of Ljubljana, Slovenia

156 Diagnosis of Stator-Winding-Turn Faults of Induction Motor by Direct Detection of Negative-Sequence Currents Toshiji Kato Japan

428 Impact of Manufacturing Imperfections on Cogging Torque Level in PMSM

Lovrenc Gasparin, Rastko Fiser Slovenia


449 Advanced generator design using Pareto-optimization Martin Kuhn Germany

287 Single Phase Active Current-Source Rectifier Operated with Power Factor and Distortion

Power Factor Control Jan Michalik, Jan Molnar, Zdenek Peroutka Czech Republic

455 Space Vector Based Hybrid Random Pulse Width Modulation Technique for a 3-level

inverter David Solomon George, M. R. Baiju India

Session APEHIA-II: Applications of Power Electronics in Home Appliance, Industry and

Aerospace II

Date/Time: Thursday, 08 December 2011/11:00 – 12:40 hrs Venue: Connection Room 2 Session Chair: Fu-Sheng Pai, )ational University of Tainan, Taiwan

331 Design of a Lithium-iron Battery Charger with the Open-Circuit Voltage Function Evaluation Bo-Ge Huang,Fu-Sheng Pai,Shyh-Jier Huang, Yu-Jhe Li Taiwan

383 An Experimental Verification and Analysis of a Single-phase to Three-phase Matrix

Converter using PDM Control Method for High-frequency Applications Yuki )akata, Jun-ichi Itoh Japan

337 Improvement of Self-Oscillating Electronic Ballast with High Power Factor: A Combination

of Charged-Pump and Valley-Fill SARAYOOT THO)GKULLAPHAT, PISIT LIUTA)AKUL, VIBOO) CHU)KAG Thailand

380 Experimental Verification of Rectifiers with SiC/GaN for Wireless Power Transfer Using a

Magnetic Resonance Coupling Keisuke Kusaka, Jun-ichi Itoh Japan

447 Novel Approach to Closed-Loop Control of Wire Bending Machine

Henrik Lavric, Miroslav Bugeza, Rastko Fiser Slovenia

Session RET-IV: Renewable Energy Technologies IV

Date/Time: Thursday, 08 December 2011/11:00 – 12:40 hrs Venue: Ballroom 1 Session Chair: Akshay K Rathore, )ational University of Singapore, Singapore

212 A Control Strategy for Series Connected Offshore Wind Turbines Alejandro Garces, Marta Molinas Norway


242 A New 98% Soft-Switching Full-Bridge DC-DC Converter based on Secondary-Side LC

Resonant Principle for PV Generation Systems Daisuke Tsukiyama, Yasuhiko Fukuda, Shuji Miyake, Saad Mekhilef, Soon-Kurl Kwon and Mutsuo )akaoka Japan

172 A Novel MPPT Algorithm for Load Protection Based on Output Sensing Control

Mehdi Hassani, Saad Mekhilef, Aiguo Patrick Hu, )eville R. Watson Malaysia

284 A Control Method for Maximum Power Point Tracking of a PMSGBased WECS using

Online Parameter Identification of Wind Turbine Yuya Izumi, Alok Pratap, Kousuke Uchida, Akie Uehara, Tomonobu Senjyu, Atsushi Yona,Toshihisa Funabashi Japan

Session SMPS-II: Switch-Mode Power Supplies and UPS II

Date/Time: Thursday, 08 December 2011/14:00 – 15:40 hrs Venue: Connection Room 1 Session Chair: Dylan Dah-Chuan Lu, University of Sydney, Australia

325 Robust Digital Voltage-Mode Controller for Synchronous Soft-Switching Boost Converter Veerachary Mummadi India

328 Digital Two-Loop Controller Design for Fourth Order Split-Inductor Converter Veerachary Mummadi

India 388 A novel Fast Average Current Mode Digital Control for DCDC Converter

Kazuhiro Kajiwara, Fujio Kurokawa Japan

399 Correlation-based System Identification of Digitally Controlled SMPS

Jun-Yan Liu, Chun-Hung Yang, Chien-Hung Tsai Taiwan

Session APEHIA-III: Applications of Power Electronics in Home Appliance, Industry and

Aerospace III

Date/Time: Thursday, 08 December 2011/14:00 – 15:40 hrs Venue: Connection Room 2 Session Chair: Akshay K Rathore, )ational University of Singapore, Singapore

86 Study of the Effect of the Nonlinear Inductor Behavior on the Performance of Resonant Tank for Driving Fluorescent Lamp Daming Zhang, Yitao Liu Singapore

393 Single-Switch Constant-Power Equalization Charger Based on Multi-Stacked Buck-Boost

Converters for Series-Connected Super-capacitors in Satellite Power System Masatoshi Uno


Japan 471 Frequency Characteristics of Choke-Input-Type Diode Rectifier Circuit for Three-Phase

Rectangular-Voltage-Fed Distribution System Tomoaki Imaeda, Takaharu Takeshita and Yasuyuki )ishida Japan

456 New Evaluations on Soft Commutation Range of A Soft Switching PWM Boost DC-DC

Converter with Edge-Resonant Switched Capacitor Modular Yujiro Takeuchi, Tomokazu Mishima, Mutsuo )akaoka Japan


Technical Paper Abstracts Session Plenary Session Date/Time Tuesday, 06 December 2011/09:30 – 12:40 hrs Venue Ballroom 2 Chair Sanjib Kumar Panda, National University of Singapore, Singapore 324 A Shunt Current Control for Hybrid Power Source Consisting of EDLC and Battery in PMSM

Drive )aomitsu Urasaki, Masaharu Iwasaki and Tomonobu Senjyu Dept. of Electrical and Electronics Engineering, University of the Ryukyus A hybrid power source consisting of electric double layer capacitor (EDLC) and battery is proposed. The charge and discharge control in this power source is executed so as to reduce the repetitive charge and discharge operation of battery. This operation contributes the life extension of battery. In addition, a buck-boost converter which prevents DC-link voltage from changing by the decrease of EDLC voltage is introduced in this power source. Computer simulation results illustrate that the proposed hybrid power source reduces the utilization ratio of battery without varying DC-link voltage of voltage source inverter.

250 A Simple Voltage Control Method with Unity Displacement Power Factor for Four-Leg

Indirect Matrix Converters

M. Rivera1, I. Contreras1, J. Rodriguez1, R. Pena2, J. Espinoza2 1Universidad Tecnica Federico Santa Maria Av. España 1680, Valparaiso, CHILE 2Universidad de Concepcion Victor Lamas 1290, Concepcion, CHILE

While the known modulation and control techniques for four-leg matrix converters are based on pulse width modulation or three-dimensional space vector modulation, this paper presents a finite control set model predictive control strategy with a prediction horizon of one sample time to control the four-leg indirect matrix converter. An LC output filter is connected between the converter and the load. The four-leg indirect matrix converter is developed to deliver power to the unbalanced/nonlinear three-phase loads and it can produce three output voltages independently with one additional leg. The proposed voltage control strategy is based on prediction calculation to select the switching states of the converter. By using a predictive cost function, the optimal switching state to be applied to the next sampling time is selected. This is done in order to obtain unity displacement power factor in the input side and a positive dc-link voltage at any time, while maintaining a good tracking of the load voltages to their respective references. The feasibility of the proposed strategy is verified by simulation results. 275 Monolithic RC-Snubber for Power Electronic Applications J. vom Dorp1, S.E. Berberich2, T. Erlbacher3, A.J. Bauer3, H. Ryssel1,3 and L. Frey1,3 1Chair of Electron Devices, University Erlangen-)uremberg, 91058 Erlangen, Germany 2SEMIKRO) Elektronik GmbH & Co. KG, 90431 )uremberg, Germany 3Fraunhofer Institute for Integrated Systems and Device Technology, 91058 Erlangen, Germany In this work, we present a monolithic RC-snubber for power electronic applications that outperforms state of the art RC-snubbers in terms of characteristic electrical parameters. The principle device structure as well as the process technology is presented. The outstanding properties of the device are a high capacitance per area (1.5 nF/mm2), a low temperature coefficient of the capacitance value (85 ppm/°C) and a low leakage current (<1 nA) for voltages up to 250 V. Characteristic electrical parameters of the single device and in a typical application are shown. In comparison to a SMD snubber, the monolithic RC-snubber shows a significant reduction of overvoltage during switching and enhanced electromagnetic noise suppression.


381 Investigation of the Circuit Parameters Design in a Power Converter by using High-Frequency

Power Devices Kenta Watanabe and Jun-ichi Itoh )agaoka University of Technology )iigata, Japan This paper discusses the problems which are the power consumption of gate drive circuit and voltage oscillation of source-to-gate voltage in the power converters using high-frequency power devices. The circuit parameters design were executed in terms of (i) power consumption of the gate drive circuit at FET and (ii) voltage oscillation of source-to-gate voltage at FET. As for (i), it is confirmed that the gate drive circuit can reduce the power consumption of it from 250 mW to 10 mW. As for (ii), it formulated the relationship between the circuit parameters and the voltage oscillation by circuit analysis. However, a gap of voltage oscillation occurs for the calculation results. The simulation was performed in order to presume this gap of voltage oscillation factor. Then, it confirmed that gap of the experimental results and the calculation results could be reduced to about 2V. Session Power Electronic Emerging Technologies I (PEET-I) Date/Time Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue Ballroom 2 Chair Yen Kheng Tan, Nanyang Technological University, Singapore

161 Torque and Flux Control of an Induction Machine fed by an Indirect Matrix Converter with

Instantaneous Unity Power Factor Operating under Unbalanced AC-Supply M. Rivera1, J. Rodriguez1, J. Espinoza2 and J.W. Kolar3 1Universidad Tecnica Federico Santa Maria, Valparaiso, CHILE 2Universidad de Concepcion, Victor Lamas 1290, Concepcion, CHILE 3ETH Zurich, 8092 Zurich, SWITZERLA)D A predictive torque and flux control method for an induction machine fed by an indirect matrix converter is presented in this paper. The control scheme selects the switching state that minimizes the error in the torque and flux predictions according to their reference values and, at the same time, the control scheme is enhanced by including an instantaneous reactive power minimization strategy with the goal to have unity displacement power factor in the input side of the converter. Throughout simulation results is shown that the predictive approach can be implemented simply with a good tracking of the torque and flux to their respective references and input currents with unity power factor. The behavior analysis under an unbalanced AC-supply is included, verifying the fast dynamic response of the torque and flux of the machine, where the effect of the unbalance in the AC-supply is naturally mitigated on the load side. 206 SHE-PWM Control for Asymmetrical Hybrid Multilevel Flying Capacitor and H-bridge

Converter

Mohamed S. A. Dahidah1, Senior Member IEEE, Georgios S. Konstantinou2, Student Member IEEE and Vassilios G. Agelidis2, Senior Member IEEE 1Department of Electrical and Electronic Engineering, The University of )ottingham, Malaysia Campus Jalan Broga, 43500, Semenyim, Selangor, Malaysia 2School of Electrical and Telecommunications Engineering, The University of )ew South Wales, Sydney, )SW, 2052, Australia

This paper presents a new asymmetrical hybrid voltage source multilevel converter controlled with selective harmonic elimination pulse width modulation (SHE-PWM) technique. The proposed hybrid multilevel converter combines the separate flying capacitor (FC) converter in series with an H-bridge converter with distinct DC voltage supply. The DC-link voltage of the FC is twice that of the H-bridge converter and the flying capacitor is regulated at voltage Vdc/2. The device-account is greatly reduced when compared with conventional multilevel converters for the same number of output voltage levels. The mathematical modules that describe the eight-level SHE-PWM waveform is developed and selected switching solution sets were


presented. The performance of the converter under different loading conditions is also investigated through simulation study. Keywords - SHE-PWM; asymmetrical hybrid multilevel inverter; flying capacitor converter; eight-level output voltage waveform.

386 A Bew Quick Response Digital Modified P-I-D Control LLC Resonant Converter for DC

Power Supply System Fujio Kurokawa1,2, Koji Murata2 1Graduate School of Engineering, )agasaki University, Japan. 2Graduate School of Science and Technology, )agasaki University, Japan. In this paper, a new quick response digital modified P-I-D control with flexible duty ratio for LLC resonant dc-dc converter in -48V DC power supply system and the transient response against input voltage step changes are discussed. It is revealed that the transient response of the input voltage is largely improved compared with the conventional method. 460 A P&Q Based Synchronization Technique for Bi-Directional IPT Pick-ups

Duleepa J. Thrimawithana1 (Member, IEEE), Udaya K. Madawala2 (Senior Member, IEEE) and M. )eath (Student Member, IEEE) 1Dept. of Electrical & Electronic Engineering, Auckland University of Technology, Auckland, )ew Zealand 2Dept. of Electrical & Computer Engineering, The University of Auckland, Auckland, )ew Zealand Bi-directional Inductive Power Transfer (IPT) systems essentially require some form of synchronization between loads (pick-ups) and the main or primary power source. This paper presents a novel technique that can be used to synchronize pickups of a bi-directional IPT system with the primary converter (source). The proposed technique monitors the real (P) and reactive (Q) power generated by the corresponding pickup converter and conditioning it to follow a predetermined value, therefore forcing the pickup converter to operate in synchronization with the primary converter. A detailed analysis of the proposed technique is presented to verify its stability under different operating conditions. The viability of the technique, which is applicable to both single and multiple pick-up bi-directional IPT systems, is demonstrated through simulations of a 1.5 kW system.

270 A Series-Resonant Half-Bridge Inverter for Induction-Iron Appliances ). Sanajit1 and A. Jangwanitlert2 1Department of Electrical Power Engineering, Faculty of Engineering, Mahanakorn University, Bangkok Thailand, 10530 2Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok Thailand, 10520 This paper presents a series-resonant half-bridge inverter for induction iron appliances. The series-resonant inverter is implemented to provide Zero Current Switching (ZCS) for all the switches at turn off conditions and Zero Voltage Switching (ZVS) at diode turn on. The main features of the proposed inverter are simple PWM control strategy and high efficiency. The operation mode of the inverter will be evaluated corresponding to the duty cycle of the switch. The experimental results verify the advantages of the proposed topology. Keywords - ZVS, ZCS, induction iron, half-bridge inverter, resonant

Session Motion Drives and Motion Control I (MDMC-I) Date/Time Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue Connection Room 1 Chair Rastko Fišer, University of Ljubljana, Slovenia


72 Hybrid-Fuzzy Controller Optimization via Semi-Parallel GA for Servomotor Control )ordin Saad Member IEEE , Oyas Wahyunggoro Member IEEE, and Taib Ibrahim Department of Electrical & Electronic Engineering, Universiti Teknologi PETRO)AS, Malaysia Servomotor uses feedback controller to control either the speed or the position or both. This paper discusses the performance comparisons of a modified genetic algorithm, named as the semi-parallel operation genetic algorithm (SPOGA) and the conventional genetic algorithm (GA), in optimizing the I/O scale factors, membership functions, and rules of a hybrid-fuzzy controller. Singleton fuzzification is used as a fuzzifier with seven membership functions for both input and output of the controller, whilst center of average is used as a defuzzifier. A 21-bit-30 population is used in SPOGA for both I/O scales and for membership functions. Two control modes are applied in cascaded: position and speed. Both the simulation and practical experiment results show that fuzzy-logic parallel integral controller (FLIC) with SPOGA-optimized is better as compared to FLIC with GA-optimized and also the non-optimized FLIC, FLC, and PI in terms of performance and the reduction of the number of test runs for the optimization. Keywords- Hybrid-fuzzy controller, Genetic algorithm, servomotor, SPOGA

80 Voltage Vector Approximation Control of Multistage - Multilevel Inverter Using Simplified

Logic Implementation

Menshawi K.M., M.). Abdulkader and Saad Mekhilef Department of Electrical Engineering, University of Malaya, Kuala Lumpur, Malaysia Three-stage redundancy-free multilevel inverter and its innovative control method have been presented. Logic comparators have been implemented in order to ease calculations and to ensure simplicity as well as to improve resultant voltage waveforms. The multistage inverter is formed by high, medium and low voltage stages, connected in series. Six-switch conventional inverter represents the main high- voltage stage. Cascaded H- bridge units are used to build the medium and low voltage stages of the inverter. The proposed control strategy is to keep the state of the high voltage stage if it can lead to the target voltage vector or medium and low approximations otherwise, are triggered. Hysteresis Comparators are used in high and medium voltage stages to hold switching states or to decide the next change. The low voltage stage works to reach the reference voltage vector by using integer rounding and comparators to achieve the best approximations. The designed control technique is verified by simulations as well as testing to prove its advantages over previous control methods.

93 Dynamic Model of Brushless DC Drive Using FE Method Based Characteristics

Burin Kerdsup and )isai H. Fuengwarodsakul The Sirindhorn International Thai-German Graduate School of Engineering King Monkut's University of Technology )orth Bangkok, Thailand

In general, a brushless dc (BLDC) motor is modeled by using a trapezoidal waveform as a back electromotive force (E.M.F.). It is a simple model with moderate accuracy. However, when BLDC motor operates in a high speed range where the back E.M.F. plays an important role to the characteristic of the machine, the trapezoidal back E.M.F. could lead to erroneous results. Although the finite element (FE) analysis can be applied for modeling with high accuracy, it takes so much time to simulate one operating point. Moreover, it is complicated and time-consuming to run in the dynamic operations. Therefore, it needs to be optimized between accuracy and time consumption. This paper presents a dynamic simulation model of BLDC motor with more accuracy comparing to the conventional simulation model. It uses the back E.M.F. and inductance which are obtained from the finite element method (FE method). The model was implemented in MATLAB/Simulink and PLECS program. In this work, the outer rotor BLDC motor for electric bicycles was used. The results of simulation model were verified by experiment.


115 A Bew Flux Observer Based on Voltage Reconstruction for Three-level DTC Inverter

Yaofei Han, Xiaohong Fan, Zhangfei Zhao Department of Electrical & Electronic Engineering, Henan University of Urban Construction, Pingdingshan, Henan Province, China

A DTC-SVM sensorless induction motor control system based NPC three-level is presented in this paper. In order to maintain high performance of the system, accurate stator flux is necessary. A novel phase compensation stator flux observer is proposed in the paper. Furthermore, a three-level phase voltage reconstruction algorithm is proposed as the base of the high precision flux observer firstly in the paper. The simulation and experiment results indicated that the DTC-SVM induction motor can run smoothly and have a high dynamic response with them. Keywords - DTC-SVM, phase compensation, phase voltage reconstruction, three-level.

122 Dynamic Model of Induction Machine with Faulty Cage in Rotor Reference Frame Vanja Ambrozic, Klemen Drobnic, Rastko Fiser and Mitja )emec University of Ljubljana, Faculty of Electrical Engineering, Trzaska 25, 1000 Ljubljana, SLOVE)IA

This paper presents a simplified model of an induction machine with broken rotor bars. The model is founded on the fact that broken bars cause asymmetries in the normally homogeneous cage’s resistance and inductance. Thus, the rotor becomes pseudo-salient. This effect could be best comprised through the rotor time constants that differ in the orthogonal axes of a rotor reference frame. A method for their evaluation is also presented. Consequently, a choice of rotor co-ordinates for the model of a faulty machine to be developed in, is obvious. Experiments show good agreement with simulation results obtained from the developed model.

Session Power Quality Issues, Harmonic Problems and Solutions I (PQHS-I) Date/Time Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue Connection Room 2 Chair Josep M. Guerrero, Aalborg University, Denmark

66 Generalized Unified Power Quality Conditioner for Compensating Current and Voltage

Imperfections

Bahr Eldin S. M, K. S. Rama Rao and ). Perumal Department of Electrical and Electronics Engineering, Universiti Teknologi PETRO)AS, 31750 Tronoh, Malaysia In this paper a novel structure of a generalized unified power quality conditioner (GUPQC) which is a combination of one shunt and two series voltage source converters (VSCs) connected among three independent distribution feeders is presented. It compensates current imperfections in one feeder and voltage imperfections in the other two feeders. The proposed design of GUPQC enhances the power quality of a multi-bus/multi-feeder distribution system by minimizing voltage and current harmonics generated by distorted supply voltage and nonlinear loads. Simulation by using MATLAB/SIMULINK shows the capability of the proposed GUPQC to minimize the major power quality problems of the distribution system model.

251 Hierarchical Control Scheme for Voltage Harmonics Compensation in an Islanded Droop-

Controlled Microgrid Mehdi Savaghebi1, Josep M. Guerrero2,3, Alireza Jalilian1, Juan C. Vasquez3 and Tzung-Lin Lee4 1Center of Excellence for Power System Automation and Operation, Iran University of Science and Technology 2Department of Automatic Control and Industrial Informatics, Technical University of Catalonia, Spain


3Institute of Energy Technology, Aalborg University, Denmark 4Department of Electrical Engineering, )ational Sun Yat-sen University, Taiwan In this paper, a microgrid hierarchical control scheme is proposed which includes primary and secondary control levels. The primary level comprises distributed generators (DGs) local controllers. The local controller mainly consists of active and reactive power controllers, voltage and current controllers, and virtual impedance loop. A novel virtual impedance structure is proposed to achieve proper sharing of non-fundamental power among the microgrid DGs. The secondary level is designed to manage compensation of voltage harmonics at the microgrid load bus (LB) to which the sensitive loads may be connected. Also, restoration of LB voltage amplitude and microgrid frequency to the rated values is directed by the secondary level. These functions are achieved by sending proper control signals to the local controllers. The simulation results show the effectiveness of the proposed control scheme.

130 Comparative Evaluation of Harmonic Compensation Capability of Active Power Filter with

Conventional and Bacterial Foraging Based Control S. S. Patnaik and Prof. A. K. Panda Department of Electrical Engineering, )ational Institute of Technology, Rourkela, India Optimizing the performance of power system networks using conventional methods is quite difficult because of the complex nature of systems that are highly non-linear and nonstationary. In this paper, it is proposed to implement Bacterial foraging (BF) optimization to the conventional shunt active power filter (APF). A comparative analysis of the APF performance is carried out for BF based and conventional approach under unbalanced supply voltage. The instantaneous active and reactive current components (id-iq) method of reference compensation current generation; having greater sensitivity to harmonics and unbalances has been utilized here. Extensive MATLAB simulations are carried out and results demonstrate that the APF with proposed implementation of BF algorithm outperforms the conventional APF in terms of both convergence rate and current harmonic compensation.

186 An Improvement of Synchronously Rotating Reference Frame Based Voltage Sag Detection

for Voltage Sag Compensation Applications under Distorted Grid Voltages

Y. Sillapawicharn, Y. Kumsuwan Department of Electrical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, 50200 Thailand An improvement of synchronously rotating reference frame based voltage sag detection for voltage sag compensation applications under distorted grid voltages is proposed. The voltage sag detection is the one of important parts in the voltage sag compensation processes. In the past, the conventional synchronously rotating reference frame (CSRRF) based voltage sag detection is widely used in the voltage sag compensation applications. Its disadvantage is a long delay of detection time. This means the next process initiation of voltage sag compensation is also delayed, and then the load voltage can be affected from voltage sag. The modified synchronously rotating reference frame (MSRRF) based voltage sag detection is able to detect the voltage sag in a short delay of detection time by differentiator employment. However, its operation under the distorted grid voltages condition is unavailable because of the sensitivity of differentiator action to the high frequency components that caused by voltage harmonic. This paper proposed the improvement of MSRRF based voltage sag detection under distorted grid voltages. The operation of proposed improved MSRRF, MSRRF, and CSRRF based voltage sag detections are investigated via computer simulation to verify the advantage of proposed voltage sag detection.

Session Applications of Power Electronics in Power System and Generation/FACTS I (APEPSG-I) Date/Time Tuesday, 06 December 2011/14:00 – 15:40 hrs Venue Connection Room 4 Chair Prafulla Chandra Panda, National Institute of Technology, Rourkela, Orissa, India


26 Gradient Approximation Based Maximum Powe Point Tracking for PV Grid-Connected

System Ahmed. G. Abo-Khalil and Tarek Ahmed Electrical Engineering Department, Faculty of Engineering Assiut University, Egypt The photovoltaic (PV) generators have a nonlinear V-I characteristics and maximum power points which vary with the illumination level and temperature. Using maximum power point tracker (MPPT) with the intermediate converter can increase the system efficiency by matching the PV systems to the loads. This paper presents a maximum power point tracker based on Gradient Approximation (GA) and a control scheme for and a control scheme for a single-phase inverter connected to the utility grid. GA provides an adaptive nature for the system performance. Also the GA provides excellent features such as fast response, good performance and the calculation of the maximum power point condition is independent of the PV characteristics. The single-phase dc/dc converter is designed to control the power flow to the maximum value. The simulation results have verified the validity of the proposed estimation algorithm. 273 Malfunction Analysis of SiC-SIT DC Circuit Breaker in 400V-DC Power Supply System Seiya Abe1, Sihun Yang2, Masahito Shoyama2, Tamotsu )inomiya3, Akira Matsumoto4, Akiyoshi Fukui4 1The International Center for the Study of East Asian Development 2Kyushu University 3)agasaki Universit 4)TT Facilities, Inc. In DC power supply system, a fast response circuit breaker is required. Semiconductor DC circuit breaker is an important key technology in DC power supply system. This paper considers the malfunction issue of Silicon Carbide-Static Induction Transistor (SiC-SIT) based DC circuit breaker in DC power supply system. The malfunction mechanism is explained, and a solution methodology proposed. Investigations are achieved by MATLAB/Simulink and experimented work.

145 A Bew Time-Sharing Charge 5L Inverter

Masakazu Muneshima, Shota Urushibata, Zhang Hui, Takehisa Koganezawa, Masakatsu )omura Meidensha Corporation Cascade multilevel inverter has been proposed for high voltage applications. However, such a topology always requires an isolated multiphase transformer for individual inverter cells, which increases the weight, volume and cost of equipment, as well as wiring complexity on transformer’s secondary side. In this paper, a new flying capacitor 5 level (FC 5L) inverter with single DC source is proposed, utilizing switching pattern control as well as time-sharing charge concept. Validity during commutation period is also analyzed. Performance such as 5 level output phase voltage, voltage balancing of flying capacitors are verified by simulation.

178 Distributed Generation using Indirect Matrix Converter in Boost Operating Mode Xiong Liu1, Student member, IEEE, Poh Chiang Loh1, Member, IEEE, Peng Wang1, Member, IEEE, Frede Blaabjerg2, Fellow, IEEE 1Division of Power Engineering, School of Electrical and Electronic Engineering )anyang Technological University, 639798, Singapore 2Institute of Energy Technology, Aalborg University, Aalborg East, Denmark Indirect matrix converter (IMC) using two stages configuration is an interesting alternative for ac/ac conversions. In some cases, the ac/ac converter needs boost function, which can’t be achieved by traditional IMC due to its limited input-to-output voltage transfer gain 0.866. Alternatively, reverse power flow operation of IMC can be implemented to meet voltage boost requirement, where the input ac source is connected to the converter’s voltage source side and the output utility grid or load is connected to the current source side. This paper proposes control schemes of IMC under reverse power flow operation for both grid-


connected and isolated modes with distributed generation suggested as a potential application. In grid-connected mode, the commanded power must be extracted from the input ac source to the grid, in addition to guarantee sinusoidal input/output waveforms, unity input power factor and controllable grid-side power factor. In isolated mode, the matrix converter is controlled to supply a three-phase ac voltage and also guarantee sinusoidal input/output waveforms as well as unity input power factor. Simulation and experimental results are provided to validate the effectiveness of the control schemes for the proposed matrix converter. 209 Damping of Power System Oscillations using an Advanced Unified Power Flow Controller

Jose.P.Therattil and P.C.Panda Department of Electrical Engineering, )ational Institute of Technology, Rourkela, Orissa, 769008, India. In this paper an advanced controller is designed. The purpose of the above nonlinear controller is to damp out inter area oscillations of a multi machine power system using Unified Power Flow Controller (UPFC). Generators in a power system would experience continuous load change in its daily operation, and drastic changes can occur when there is fault in the power system. Since nonlinear controllers are independent of operating point, this controller can give better results than linear controller. The proposed controller is implemented on a two area power system. The results are compared against a traditional PI controller at different loading conditions. Keywords - Dynamic stability; Nonlinear Control; System oscillations; Unified power flow controller.

Session Modelling & Simulation in Power Electronics I (MSPE-I) Date/Time Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue Ballroom 2 Chair Veerachary Mummadi, Indian Institute of Technology Delhi, New Delhi, India

466 Comparison of Zero-Voltage-Switching Current-Fed Full-Bridge and Half-Bridge Isolated

Dc/Dc Converters with Active-Clamp Akshay K Rathore1, Member IEEE and Xiaodong Li2, Member IEEE 1Electrical and Computer Engineering, )ational University of Singapore, 117576 Singapore 2Faculty of Information Technology, Macau University of Science and Technology, Macau, P R China This short paper presents a comparison between high-frequency current-fed full-bridge and half-bridge isolated dc/dc converters with active-clamp snubber. Active-clamp snubber, in addition to absorbing the turn-off voltage spike across the switch, acts as a zero-voltage transition auxiliary circuit resulting in zero-voltage switching (ZVS) of the semiconductor devices of converters. ZVS range depends upon the design, in particular, ratio of leakage and magnetizing inductances of the transformer. Cost, ZVS range, efficiency, volume, components’rating, losses and efficiency, and power density per cell are compared to select a converter.

154 Analysis and Compensation of the Output Voltage Imbalance in a Four-Switch Half-Bridge

PFC

Sheng-Yuan Ou, Member, IEEE, Chin-Tse Ho, Jui-Chih Li and Chung-Yen Yang Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan This paper provides the compensation strategies of the output voltage imbalance on the four-switch half-bridge (HB) power factor corrector (PFC). Conventionally, the imbalance compensation is achieved by PWM switching control in four-switch HB PFC. But, the output voltage imbalance compensation will be failure while the imbalance phenomenon excesses a threshold to limit the load range in the four-switch HB PFC. To enlarge the desired range of load variation, a dc component is injected in the input current to eliminate the output voltage imbalance further as the load varies to be not modulated with conventional


PWM. By the integrated control strategy, the results of output voltage imbalance and power factor will be discussed and verified with experiments.

448 Voltage-mode Digital Controller For Single Switch Sixth-Order Boost Converter

Mummadi Veerachary Dept. of Electrical Engineering, IIT Delhi, )ew Delhi, India In this paper a new high gain boost converter is proposed and then a digital voltage-mode controller is designed. Mathematical models are formulated, using state-space technique, and then discrete-time models are established. These discrete-time models are then used in the digital controller design. Salient features of the proposed topology are compared with the conventional boost converter. As the proposed converter is of single switch topology controlling becomes simple even for achieving higher voltage gain with lower duty ratios. To confirm this, design simulations have been carried out on a 30 Watt, 15 -to- 100 V converter system. Experimental results are provided to validate the proposed design.

Session Motion Drives and Motion Control II (MDMC-II) Date/Time Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue Connection Room 1 Chair Pavel Vaclavek, Brno University of Technology, Czech Republic

155 Sensorless PMSM Drive System Based on Direct Torque Control in M–T Frame Synchronized

with Stator Flux-Linkage Vector

Yukinori Inoue, Shigeo Morimoto and Masayuki Sanada Osaka Prefecture University

This paper proposes a direct torque controller in a rotating M–T reference frame that is synchronized with the stator flux-linkage vector. Both the torque and flux estimator and the controller operate in the M–T frame, whereas conventional estimators operate in the stationary α–β reference frame. The proposed controller is suitable for rotor speed and position sensorless control of permanent magnet synchronous motors. Thus, this paper also proposes a rotor speed and position sensorless drive system based on direct torque control in the M–T frame. In addition, control laws such as flux weakening and torque limiting derived from equations in the M–T frame can be easily applied to operation over a wide-speed range. Experimental results demonstrate the effectiveness of the proposed system.

190 Driving Performance Enhancement for SRM with Adaptive Learning Control of Critical

Energized Parameters Shun-Chung Wang1, Han-Bin Lin1, Shao-Shan Chiang1, Yi-Hua Liu2, Yuan-Lin Chen3, Kuei-Chiang Liang1 1Lunghwa University of Science and Technology, Taoyuan County, Taiwan 2)ational Taiwan University of Science and Technology, Taipei, Taiwan 3Mingchi University of Technology, )ew Taipei City, Taiwan In this paper, to enhance the switched reluctance motor (SRM) driving performance, an adaptive learning control (ALC) based on the repetitive tuning of the critical energized parameters is proposed to reduce the torque ripple and energy conversion loss. A simple modulating mechanism on energizing commutation angles and duty cycle is repeatedly applied to the SRM until desired tracking is achieved. According to the system load requirement, an initial suboptimum learning condition, derived from the expert experiential knowledge and accurate magnetization characteristics of the SRM, is given to guarantee a good learning ratio and convergence mechanism. Enhancement of driving performance is obtained on account of the best programming of phase current profile via the well-tuned duty cycle and turn-on-and-off angles to make minimum energy conversion loss and torque ripple reachable. Evolution and simulation based on the DSP-based processor has been developed to realize the proposed control approach and setup the SRM drive


system. Experimental results on a 4-phase 8/6 pole SRM are included to show the effectiveness and performance enhancements of the presented SRM drive system. Keywords - adaptive learning control, energy conversion loss, switched reluctance motor (SRM), torque ripple.

192 Performance Improvement of Induction Motor made of Three Dimensional Shaped SMC Core Masayuki Morimoto Department of Electrical and Electronic Engineering Tokai University, Hiratsuka-shi, Japan In this paper, performance improvement of an induction motor is discussed. Soft Magnetic Composite (SMC) is used as an iron core of the motor. The stator core is divided into 48 parts. The shape of stator core has 3D shape. Conventionally, the core is consisted by 2D laminated core by same punched steel. In his study, the teeth of the stator extended in order to enlarge the pole surface area. Experimental motor shows that the efficiency improves, and maximum output power increases at the same external volume of the motor. Keywords - iron powder core; inverter drive; efficiency; electromagnetic steel; load characteristics

195 A Bew Four-level Dual Inverter fed Open-end Winding Induction Motor Drive

V. T. Somasekhar, B. Venugopal Reddy, Student Member, IEEE. )ational Institute of Technology, Warangal, India It is known that Four-level inversion can be achieved with two two-level inverters feeding an open-end winding induction motor from both ends with unequal DC link voltages in the ratio of 2:1. It is also known that this power circuit configuration could result in the overcharging of the DC-link capacitor corresponding to the inverter operating with the lower voltage. In this paper, a new power circuit topology is proposed, wherein, a rectifier-inverter combination is nested, or embedded, in the conventional two-level inverter configuration. The output of the conventional two-level inverter feeds one end of the open-end winding induction motor, while the output of the nested rectifier-inverter combination feeds the other end. By a judicious choice of the DC-link voltage of the embedded rectifier, it is possible to obtain a four-level drive, while avoiding the overcharging of the DC-link capacitor corresponding to the inverter operating with the lower DC input voltage. Also, the problem of zero-sequence currents, commonly encountered in Open-end winding induction motor drives, is avoided by resorting to a carrier based PWM scheme. This PWM scheme automatically ensures that the inverter connected to the higher DC-link voltage is switched with a lower frequency, compared to its low voltage counterpart.

223 Field Weakening Implementation in AC Induction Machine Predictive Control

Pavel Vaclavek and Petr Blaha Brno University of Technology Faculty of Electrical Engineering and Communication Department of Control and Instrumentation Brno, Czech Republic AC induction motors become very popular for motion control applications due to their simple and reliable construction. Control of drives based on AC induction motors is a quite complex task. In most high-performance applications classical vector control is currently used. While this control method is usually reliable it has some limitations especially in controllers tuning and constraints handling. In the current paper we present an AC induction machine control method based on model predictive control including field weakening strategy. The proposed control algorithm has been proved and successfully verified in simulation.

Session Power Quality Issues, Harmonic Problems and Solutions II (PQHS-II) Date/Time Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue Connection Room 2


Chair Chung-Ming Young, National Taiwan University of Science and Technology, Taiwan

124 Analysis of dv/dt Filter Installation for PWM AC Drive Applications Pravit Mart-ro1, Warachart Sae-Kok1 and Surin Khomfoi1,2 1Department of Electrical Engineering, 2Center of Excellence for Innovative Energy Systems, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang 1 Soi Chalongkrung 1, Ladkrabang, Bangkok, 10520, Thailand The aim of this paper is to analyze and propose the installation of a cascaded dv/dt filter for PWM AC drive system with long feeding cable. The effects of installing single and cascaded second order dv/dt filters are investigated and compared. The investigated system is simulated by MATLAB/Simulink program and implemented to substantiate the effectiveness of a cascaded dv/dt filter. Both simulation and experimental results show that the system using the cascaded dv/dt filter can extend the cable length longer than the system using only a single dv/dt filter.

451 A Half-Bridge Inverter Based Active Power Quality Compensator with a DC Voltage Balancer

for Electrified Railways

Tint Soe Win, Yusuke Baba, Masayuki Okamoto, Eiji Hiraki, and Toshihiko Tanaka Graduate School of Science and Engineering, Yamaguchi University This paper proposes a half-bridge inverter based Active Power Quality Compensator (APQC) with a DC voltage balancer for electrified railways. The APQC is composed of three-leg structured power devices with two common DC capacitors. The first two legs perform as two half-bridge inverters to generate compensation currents and the third-leg is used for DC voltage balancer. The first-leg is connected to α-phase and the second-leg is connected to β-phase. Two DC capacitors are connected in series and midpoint is grounded. These two halfbridge inverters exchange and balance active power for two feeders through two common DC capacitors and compensate reactive and harmonic components of the distorted load currents. The third-leg controls two common DC capacitors to balance voltage level of each other. Using proposed APQC, the primary side of Scott transformer attains balanced and sinusoidal source currents. The principle and control algorithm of proposed a halfbridge inverter based APQC is discussed in detail. The proposed APQC is confirmed by both the PSIM computer simulation software and prototype experiment system. Simulation results show that the proposed APQC can achieve balanced and sinusoidal source currents in secondary side of Scott transformer. Keywords - electrified railways, active power quality compensator, half-bridge inverter, three-leg inverter, voltage balancer, constant dc capacitor voltage control

346 Transformerless Single-Stage High Step-Up AC-DC Converter Based on Symmetrical

Cockcroft-Walton Voltage Multiplier with PFC Chung-Ming Young, Ming-Hui Chen, Hong-Lin Chen, Jen-Yi Chao and Chun-Cho Ko Department of Electrical Engineering )ational Taiwan University of Science and Technology Taipei, Taiwan, R.O.C. 10607 This paper proposes a transformerless single-phase single-stage high step-up ac-dc converter based on symmetrical Cockcroft-Walton voltage multiplier (CW-VM) with only adding two bidirectional switches and two boost inductors. With the help of the boost structure, not only the voltage gain can be higher than that of the conventional symmetrical CW-VM but also the power factor correction (PFC) methods for conventional boost ac-dc converter can apply to the proposed topology to achieve high quality of line conditions and regulated dc output. In this paper, a commercial average-current controller (ICE1PCS01) based on quasi-steady-state approach by using one cycle control technique is used to implement the PFC function. By this way, the multiplier and line-voltage sensor are unnecessary as compared with the multiplier approach; it simplifies the controller design and reduces the circuit components and cost. A 250W laboratory prototype is built for testing, and experimental results demonstrate the validity of the proposed converter.


382 Bon-linear load compensation in Fuel Cell grid interfaced system using active power filter

Gitanjali Mehta1, Member IEEE and S. P. Singh1, Member IEEE, R. D. Patidar2 1Electrical Engineering Department, Indian Institue of Technology, Roorkee, India 2Mandsaur Institute of Technology, Mandsaur, India The increasing global warming concerns and diminishing fossil fuels have made us necessary to look for alternative sources of energy. Fuel Cell technology holds promise towards sustainable power generation, it being pollution free and using readily available fuels. This paper presents the modeling, control and design analysis of a three-phase Grid-interactive Fuel Cell system with active filter functions. The main focus of this paper is to control the active power supplied by the Fuel Cell Distributed Generation system while compensating harmonics and reactive currents caused by the nonlinear loads using shunt active power filter. The developed Fuel Cell model is connected to the DC-side of the voltage source inverter for interfacing with the grid. Thus the same inverter is utilized as power converter to inject the power generated from the Fuel Cell to the grid and to act as active power filter to compensate load current harmonics and load reactive power demand. The designed controller either regulates the power flow between the Fuel Cell and the Grid or works as an active power filter or performs both the functions simultaneously. The simulation model of the overall system is developed in MATLAB/Simulink environment using SimPower Systems blocksets and then PIL simulated using TMS320F2812 DSP. The results are obtained for different operating conditions with varying load demands to prove the effectiveness of the entire system. Keywords - Fuel Cell, Distributed Generation, Active, Reactive and Harmonic Power, Active Power Filter

398 A Study on the Harmonic Issues at CSIRO Microgrid Yang Du1, Dylan Dah-Chuan Lu1, David Cornforth2 and Geoffrey James2 1School of Electrical and Information Engineering The University of Sydney, )SW, Australia 2Energy Transformed Flagship CSIRO, )SW, Australia With increasing number of photovoltaic (PV) systems connected to the electricity network in Australia, power quality becomes a major concern. There is an increasing interest in Microgrids due to their potential to provide a solution to integrate renewable energy into the wider grid. This paper presents a study on the harmonic issues in a Microgrid. Different experimental scenarios have been carried out to characterize the voltage and current distortions under different operation conditions. Matlab/Simulink simulation and field experimental results have been provided. The results showed that the harmonic current emission can be affected by the output power level of PV inverter. In addition, the current and voltage waveforms distortion at the Point of Common Coupling to the grid is significantly increased when the net power follow through the bus is close to zero. Keywords - harmonic; Microgrid; PV; inverter

Session Applications of Power Electronics in Power System and Generation/FACTS II (APEPSG-II) Date/Time Tuesday, 06 December 2011/16:00 – 17:40 hrs Venue Connection Room 4 Chair King Jet Tseng, Nanyang Technological University, Singapore

513 Measurement and Simulation of Grounding Resistance with Two and Four Mesh Grids M. A. Salam, Senior Member, IEEE, Koh Ming Jen and Md. Ayub Khan Institute Technology Brunei (A Technology University), Jalan Tungku Link, BE 1410, Brunei Darussalam This paper presents the simulation and measurement of grounding resistance with two different mesh grids. Initially, soil resistances have been measured by F. Wenner four-pole equal method at the selected sites near the Power Station. Then soil resistivity has been calculated from the measured soil resistance. The root mean


square errors between the measured and simulation soil resistivities are respectively found to be 3.77% and 4% for two and four mesh grids. The Fall-of-potential (FOP) method is used to measure the grounding resistance and the minimum values are found to be 100.3Ω and 96.8 Ω respectively for two and four mesh grids. The measured results are then compared with the simulation results and are found to be in good agreement. In addition, ground potential rise (GPR), maximum permissible step and touch potentials have been calculated using CYME GRD simulation software. Keywords - Two and four meshes grids, fall-of-potential method, soil resistivity, grounding resistance.

319 Transient Stability Enhancement of SMIB System using PSS and TCSC-Based Controllers Rajendraprasad )arne, P.C. Panda, Senior Member IEEE, Jose. P. Therattil Department of Electrical Engineering, )ational Institute of Technology, Rourkela, Orissa, India This paper presents the modelling and simulation of a single machine infinite bus (SMIB) system with a power system stabilizer (PSS), and TCSC based controllers using MATLAB programming. Different controller structures namely Lead-Lag (LL) and a proportional-integral (PI) for TCSC Controller have been proposed and comprehensive assessment effects of the tuned TCSC Controller on the test power system have been carried out. In order to test effectiveness of these controllers, simulations are carried out in different loading conditions under a symmetrical three-phase short circuit fault occurs at generator terminals. The simulation results show that the system composed with proposed controllers has the outstanding operation in fast damping of power system oscillations. Keywords - Transient stability, single machine infinite bus (SMIB) system, power system stabilizer (PSS), TCSC Controllers.

342 Bew Artificial Beural Betwork Based Direct Virtual Torque Control and Direct Power

Control for DFIG in Wind Energy Systems

Phan Quoc Dzung1, Anh )guyen Bao1 and Hong Hee Lee2 1Faculty of Electrical & Electronic Engineering, HCMC University of Technology, Ho Chi Minh City, Vietnam 2School of Electrical Engineering, University of Ulsan, Ulsan, Korea This paper presents direct power control (DPC) strategy for controlling power flow, direct virtual torque control (DVTC) strategy for synchronizing double-fed induction generator (DFIG) with grid and voltage oriented control (VOC) for controlling voltage of link capacitor. All strategies are implemented on artificial neural network (ANN) controller to decrease the time of calculation in comparison with the conventional DSP control system. The essence of three strategies is selection appropriate voltage vectors on the rotor side converter. The network is divided in two types: fixed weight and supervised models. The simulation results on a 4-kW machine are explained using MATLAB/SIMULINK together with the Neural Network Toolbox. Keywords - Direct Power Control (DPC), Direct Virtual Torque Control (DVTC), Artificial Neural Network (ANN), Doubly-Fed Induction Generator (DFIG), Rotor-side converter (RSC), Gridside converter (GSC)

402 Variable Speed Pumping in Thermal and Buclear Power Plants: Frequency Converter versus

Hydrodynamic Coupling

Martin Sirový1, Zdeněk Peroutka1, Jan Molnár1, Jan Michalík2, Miroslav Byrtus3 University of West Bohemia / 1 RICE / 2 Dept. of Electromechanics and Power Electronics / 3 Dept. of Mechanics, Pilsen In this paper, a comprehensive case study analysis of flow control methods and appropriate technical implementations for high-power pump systems employed in thermal and nuclear power plants or heating plants will be presented. The main attention is focused on a comparison of two advanced variable speed control strategies employing VSD with frequency converter and VSD with hydrodynamic coupling.


In addition, we have included comparison with conventional flow control methods like throttling, bypass and on-of control. The calculations were performed in the software, which we have developed for design, optimization and sophisticated comparison of these drives. It is presented the methodology and developed models for evaluation of the whole drive chain from hydraulic system over pump, drive components and power supply. Keywords - Software, Simulation, Case study, Modeling, Efficiency, Variable speed drive, Electrical Drive, Induction motor, High Voltage power converters, Hydrodynamic Coupling, Generation of electrical energy, Water transport, Optimal control

406 Microcontroller based Grid Connected Inverter for Axial Flux Permanent Magnet Generator

P. Wannakarn and V. Kinnares Electrical Engineering Department, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang This paper presents a single-phase grid connected inverter for an axial flux permanent magnet generator. The power is transferred by using a microprocessor based IGBT inverter to a 220V, 50Hz single-phase supply via a transformer. The five phase axial flux permanent magnet generator provides dc voltage through five bridge diode rectifier sets. The converter circuit operation is described. The performance of the proposed axial flux permanent magnet generator under various speeds and loads is demonstrated. The system performance is investigated which appears satisfactory. Keywords - axial flux permanent magnet generator; inverter

Session Hard-Switching and Soft-Switching Static Power Converters I (HSSS-I) Date/Time Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue Ballroom 2 Chair D. Mahinda Vilathgamuwa, Nanyang Technological University, Singapore

472 Analysis and Design of Zero-Voltage-Switching Current-Fed Isolated Full-Bridge Dc/Dc

Converter

Prasanna U R, Member, IEEE, and Akshay K Rathore, Member, IEEE Electrical and Computer Engineering, )ational University of Singapore, 117576, Singapore This paper presents steady-state analysis and design of current-fed full-bridge dc/dc converter with active-clamp. The converter utilizes the energy stored in the transformer leakage, aided by its magnetizing inductance to maintain zero-voltage-switching of H-bridge switches over wide range of input voltage and load variation. Active-clamp clamps the voltage across the switches at turn-off, allowing the selection and use of low voltage devices with low on-state resistance. In addition, this small and low rating active-clamp circuit results in zero-voltage transition circuit aiding in achieving zero voltage switching of the devices. All switches undergo soft turn-on and switching losses of the converter are reduced. It improves the converter efficiency and allows high switching frequency operation, which results in compact, light weight, and low cost system. 68 The Design and Implementation of LLC Resonant Half-bridge Converter with Batural

Interleaved Power-Factor-Correction Chin-Yuan Hsu, Jian-Ting Lai, Ming-Che Lin, Ming-Kai Yang, Ming-Jyun Li and Ren-Wei Huang Department of Electrical Engineering )ational Kaohsiung University of Applied Sciences Kaohsiung, Taiwan, R.O.C. This thesis focuses on the analysis and design of the LLC resonant half-bridge converter with natural interleaving power factor correction circuit. At first, the characteristics of the natural interleaving power factor correction will be analyzed. Since the natural interleaving PFC can raise the power levels and


minimize the size of energy storage inductor, it is suitable for the front stage of the LCD TVs power supply. Then, the impact of Q and λ parameters on the LLC resonant half-bridge transfer function is analyzed. And the influence of Q and λ parameters on the curve of transfer function are analyzed by MATLAB software. We also consider the different requirements for the Q parameter in light load and heavy load, and select the appropriate Q parameter value, with which the LLC resonant half-bridge converter can have better efficiency at both light and full load. Finally, a prototype 150W AC-DC power converter with PFC is implemented. The efficiency of the front stage natural interleaved power factor correction circuit can reach 95%, and the maximum efficiency of the rear stage LLC resonant half-bridge converter is 93%. The maximum whole system efficiency is above 88%, meets current industry specification of 85%.

377 PWM Strategy of Bi–Directional Buck AC/DC Converter for Reducing Output Voltage Ripple

Yuki Onoe, Wataru Kitagawa and Takaharu Takeshita )agoya Institute of Technology, Gokiso, Showa, )agoya, Japan This paper presents a PWM strategy for a variable-voltage buck AC/DC converter for suppressing output voltage ripple. The authors propose a PWM strategy of output voltage ripple suppression via a reduction in the number of commutations. The effectiveness of the proposed PWM strategy is verified by experiments.

334 A Multilevel Voltage-Source Inverter Using H-Bridge and Two-Level Power Modules with a

Single Power Source

Suroso1 and Toshihiko )oguchi2 1Department of Electrical Engineering Jenderal Soedirman University Purwokerto, Jawa Tengah 53122, Indonesia 2Department of Electrical Electronic Engineering Shizuoka University Hamamatsu, Shizuoka 432-8561, Japan This paper presents a different topology of multilevel voltage-source inverter obtained from the H-bridge inverter and two-level power modules with a single DC power source. In the proposed topology, a novel voltage balancing circuits is presented to keep stable DC capacitor voltages, and to reduce the capacitor size. A modular structure is also an important feature of the proposed topology instead of the minimum number of the power devices. The proposed topology is tested through computer simulation using PSIM software. Laboratory experimental tests were also conducted to verify the proposed multilevel inverter topology. The computer simulation and experimental test results showed that the proposed topology works properly to synthesize a multilevel voltage waveform with low harmonics distortion. Keywords - voltage-source inverter; H-bridge, low-harmonics; multilevel

459 Multi-cell Trans-z-source Inverters

Ding Li, Student Member, IEEE, Poh Chiang Loh, Member, IEEE, Miao Zhu, Member, IEEE, Feng Gao, Member, IEEE, and Frede Blaabjerg, Fellow, IEEE Z-source inverter is a single-stage inverter with added voltage-boost capability for complementing the usual voltage-buck operation of a traditional voltage-source inverter. And it embedded with two capacitors and two inductors in its impedance network. As long as magnetically coupling components embedded within the network, the developed z-source inverters shows additional merits such as higher boosting ratio or using less passive device. The trans-z-source inverter with one transformer and one capacitor is reported recently. To increase the boosting ratio further a cascaded concept is proposed with adopting multi-winding transformer which provides a possibility for this paper to using coupled inductor instead of multi-winding transformer and remains the same voltage gain as cascaded trans-z-source inverter. Theoretical analysis for explaining these operating features has already been discussed before simulation were performed.

Session Motion Drives and Motion Control III (MDMC-III)


Date/Time Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue Connection Room 1 Chair Sanjib Kumar Panda, National University of Singapore, Singapore

224 Implementation of Food Processor Application Using Brushless DC Motor Control Zu-Sheng Ho1, Chii-Maw Uang1, Ping-Chieh Wang1, Sheng-Hao Liu2 1Department of Electronic Engineering, I-Shou University, Kaohsiung, Taiwan. 2System IC Design Division, Holtek Semiconductor Inc, Hsinchu, Taiwan.

Food processor requires wide range of variable speed response. Going on the trend of energy saving and carbon reduction, household and commercial using of food processor operation efficiency be much more paid attention to. At the present stage, food processor is mainly with UM and IM. While the operating efficiency and noise cause users must find new solution. Energy conservation, high efficiency SRM and BLDCM become to the market's rising star. Current technology shows that the efficiency of BLDCM is higher than that of the SRM. Analysis and experiment for BLDCM required motion behavior control on the instant speed up, switching forward / reverse and braking in the food processor operation are discussed in this paper. The most suitable food processor required motion behavior control methods are provided. Experimental results proved that the proposed methods in fast dynamic response of food processor do never cause the system voltage and current unstable or over load condition. Keywords - Food processor, BLDCM, Reverse power braking.

240 Exact Common-Mode and Differential-Mode Equivalent Circuits of Inverters in Motor Drive

Systems Taking into Account Input Rectifiers Pennapa Pairodamonchai1 and Somboon Sangwongwanich2 1Department of Electrical Engineering King Mongkut’s University of Technology )orth Bangkok Bangkok, Thailand 2Department of Electrical Engineering Chulalongkorn University Bangkok, Thailand In this paper, exact common-mode and differential-mode equivalent circuits of PWM inverters in motor drive systems are derived by taking the input rectifiers into account. The proposed equivalent circuits are derived by viewing the whole system as a chain of networks. The input rectifier and the inverter are represented by switching functions, while other parts are represented by impedance circuits. The obtained equivalent circuits reveal clearly that conduction of diodes in the rectifier and switching of the inverter are the causes of the coupling between the common-mode and differential-mode circuits. The transient characteristics of the common-mode current can be then obtained from the derived equivalent circuits with better accuracy as compared to the conventional one. Additionally, the DC bus charging phenomenon can also be explained from the new equivalent circuits, and the conditions which lead to such phenomenon are investigated. Simulation and experiment are finally given to confirm the validity of the theoretical results. Keywords - common-mode circuit; differential-mode circuit; coupling between modes; equivalent circuit; common-mode current; DC bus charging phenomenon

262 A Low Computation Fractal Based Voltage Space Phasor Generation for a Four Level

Inverter using Open-end Winding Induction Motor Drive

Shiny G. and M.R.Baiju Power Electronics Research Laboratory Dept. of Electronics & Communication Engineering College of Engineering Trivandrum Kerala, India A Space Vector based Pulse Width Modulation scheme for a 4-level inverter in open-end winding configuration is proposed. An approach based on fractal theory is used to find the sector and the inverter switching vectors. The space vector locations and associated computations are performed in 60° coordinate framework. This representation avoids fractional arithmetic, thereby reducing computational complexity compared to the methods based on Cartesian coordinate system. Mapping to 2-level is used to determine the


duration of switching vectors. The scheme is experimentally verified by using a 4-level inverter configuration. 4-level inversion is achieved by connecting two 2-level inverters in open-end winding configuration. The individual inverters are fed with asymmetric DC link voltages. The switching vectors for the two inverters are automatically generated without using look-up tables. The scheme is implemented and tested with a 2-HP open-end winding induction motor.

263 A Space Vector Based Pulse Width Modulation Scheme for a 5-Level Induction Motor Drive Shiny G. and M.R.Baiju Power Electronics Research Laboratory Dept. of Electronics & Communication Engineering College of Engineering Trivandrum, Kerala, India

A Space Vector based Pulse Width Modulation (SVPWM) scheme for a 5-level inverter is presented. Sector identification is carried out using an approach based on fractal concept. To represent the space vectors, 60° coordinate system is used. The use of 60° coordinate system avoids fractal arithmetic compared to Cartesian coordinate system, and increases speed of computation. No look up tables are used to generate sectors and switching vectors. The scheme also works in over modulation region. Experimental results for a 5-level inverter using induction motor in open-end winding configuration are presented to validate the scheme.

286 Design of a Lying Sensor for Permanent Magnet Synchronous Machine Torque Ripple

Reduction using the Iterative Learning Control Technique

Yi YUA)1, Franҫois AUGER1, Luc LORO)1, Franck DEBRAILLY2, Mathieu HUBERT2 1IREE)A Pôle Énergie, CRTT, 37 Bd de l’Université, BP 406, 44602 Saint-)azaire cedex, France 2SKF France, Automotive Development Centre - Sensor Integration, 204 boulevard Charles de Gaulle, 37540 Saint-Cyr-sur-Loire, France Permanent magnet synchronous machines (PMSM) are widely used for high-performance drive systems. However, an important problem for PMSMs is that parasitic torques may degrade the performances of the drive system. These torque ripples generally vary periodically with the rotor position and lead to speed ripple. To suppress these speed ripples, an iterative learning control (ILC) is used, because it is a good candidate for dealing with periodical errors. In this paper, an original approach called “lying sensor technique” is proposed and analyzed. Compared to the torque ripple reduction approaches which realize the current compensation calculation in the controller, this technique consists in modifying the feedback speed information of the sensor. ILC is integrated into this technique for computing the lying speed information. Simulation is used to check the effectiveness of this approach. Simulation results prove that the ILC lying sensor technique has a good performance.

Session Distributed Generation and Smart-Grid I (DGSG-I) Date/Time Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue Connection Room 2 Chair Sanjib Kumar Sahoo, National University of Singapore, Singapore

320 Operation Principle of Multiple DC Smart Grids Hayato Yamauchi, Masahiko Kina, Kyohei Kurohane, Kosuke Uchida, Atsushi Yona and Tomonobu Senjyu The Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan. Recently, smart grid has been attracting attention from the view point of the introduction of more renewable energy. However, due to the fluctuating power output of renewable energy sources, the DC bus voltage fluctuation of DC grid occurs. It becomes a major issue at the time of islanding. This paper presents coordinated operation of multiple DC smart grids. The power system consists of three DC smart grids. Each DC smart grid has PV generations, wind generators and controllable loads. In this paper, the DC bus voltage are maintained within the acceptable range by applying the power consumption control of the controllable


loads, the power control by grid-connected converter and the power control by the renewable sources. Effectiveness of the proposed method is verified by simulation results in PSIMR® environment. Keywords - Smart grid, islanding operation, dc distribution, droop characteristic, controllable loads

353 Optimum Operation Planning of Controllable Loads in Smart House

Kazuki Ogimi1, Kenichi Tanaka1, Kousuke Uchida1, Atsushi Yona1, Tomonobu Senjyu1, Toshihisa Funabashi2 and Chul-Hwan Kim3 1University of the Ryukyus, 1 Senbaru )ishihara-cho )akagami Okinawa 903-0213, Japan. 2Meidensha Corporation, Tokyo 141-8565, Japan. 3Sungkyunkwan University, Suwon City 440-746, Korea. From the perspective of global warming suppression and depletion of energy resources, renewable energy such as wind generation and photovoltaic generation (PV) are getting attention in distribution systems. Additionally, all electrification apartment house or residence such as DC smart-house have increase in recent years. However, due to fluctuating power from renewable energy sources and loads, supply-demand balancing fluctuation of power system become problematic. Therefore, smart-grid has become very popular in the worldwide. This paper presents a methodology for optimal operation of a DC smart-house with putting controllable loads as smart grid. The DC smart-house consists of PV system, solar collector (SC) system, heat pump, electrical vehicle (EV), and battery. The heat pump, the battery, and the EV are used as the controllable loads. The proposed method has been developed with the aim of power supply from power system within the acceptable range and reduction of max-min interconnection point power flow error as low as possible to smooth supply power from distribution system. Power consumption of controllable load determines to optimize the maxmin interconnection point power flow error based on information from power system with communication. Keywords - smart grid, DC smart-house, optimal operation, interconnection point power flow fluctuation.

397 Evaluation of current reference generation methods for a three-phase inverter interfacing

renewable energy sources to generalized micro-grid

S. Dasgupta, S. ). Mohan, S. K. Sahoo, S. K. Panda Department of Electrical and Computer Engineering )ational University of Singapore In this paper, different methods of deriving the grid current references for a three-phase renewable energy based inverter connected to generalized micro-grid system are compared. The three-phase micro-grid voltage is considered to have unbalance as well as harmonic contamination. Primarily the p-q and FBD theory based methods are compared in terms of different specifications like manifestation of DC link side ripples, computational power required for implementation and restriction on the power circuit topology. Another method, equal phase active power sharing is also compared with these well known methods and its effect on the power circuit topology is also investigated. The comparisons are carried out based on the mathematical analysis and the experimental results under different operating conditions. Keywords - Three-phase grid connected inverter, Generalized unbalanced micro-grid, p-q theory based grid current reference generation, FBD theory based grid current reference generation, Equal phase active power sharing based grid current reference generation, Three-phase-three-wire connection.

421 A Bovel Model to Determine Optimizing Powe and Capacity for Energy Storage Systems on

Competitive Electricity Markets

V. V. Thang1, ). H. Kong1, D. Q. Thong2 and B. Q. Khanh2 1Department of electric power systems Thainguyen University of Technology (T)UT) Thainguyen, Vietnam 2Department of electric power systems Hanoi University of Science and Technology (HUST) Hanoi, Vietnam Distributed generators (DGs) and renewable energy resources (Hydroelectric, photovoltaic, solar thermal technologies, and wind farms…) have been applied widely on planning and operating of


distribution systems due to the restructure of electricity market and the development of technology. The energy storage systems (ESSs) can store energy and then retrieve it in the other time, increase flexibility of distribution systems. Hence, many researches and applications have been conducted. Effects of ESSs on planning and operating the wind generators therefore should be carefully investigated. This paper proposes a novel approach to calculate maximum profits of the wind generators and determine optimizing power and capacity of ESSs. This model uses an objective function that includes the total profits for electric energy sales, total costs (investment, operation and maintenance) of ESSs, transmission access fee, and upgrading cost of connected substation transformers. The proposed model is applied to test two 1500kW wind generators. The calculation is programmed by GAMS environment. Keywords - Competitive Electricity Markets (CEMs), Distributed Generators (DGs), Energy Storage Systems (ESSs)

433 Grid interconnection of distributed generation system with power quality improvement

features Gitanjali Mehta1, Member IEEE and S. P. Singh1, Member IEEE, R. D. Patidar2 1Electrical Engineering Department, Indian Institue of Technology, Roorkee, India 2Mandsaur Institute of Technology, Mandsaur, India This paper presents the modelling and control of grid interfaced Distributed Generation (DG) system with embedded active filter function. The output of the DG is given to the DC side of the Voltage Source Inverter for interfacing to the Grid. In the presented work, the features of Active Power Filter have been incorporated in the control circuit of the current controlled-voltage source inverter interfacing the DG to the grid. Thus the same inverter is utilised to inject power generated from DG source to the Grid and also to act as Shunt Active Power Filter to compensate for load current harmonics and reactive power demand. Thus, after compensation, the Grid current is sinusoidal and in-phase with Grid voltage. The entire system is modelled in MATLAB/Simulink environment and simulations carried out to verify the operation and the control principle. Various simulation results are presented for the proposed Grid interfaced DG system. Keywords - Active and Reactive Power, Distributed Generation, Utility Grid, Pulse Width Modulated Voltage Source Inverter.

Session Renewable Energy Technologies I (RET-I) Date/Time Wednesday, 07 December 2011/09:00 – 10:40 hrs Venue Connection Room 4 Chair Bhim Singh, Indian Institute of Technology (IIT) Delhi, New Delhi, India

239 A Low-cost Photovoltaic Energy Harvesting Circuit for Portable Devices

Ian Y.W. Chung and Yung C. Liang Department of Electrical and Computer Engineering, )ational University of Singapore Kent Ridge, Singapore 119260 This paper presents an efficient solar energy harvesting circuit for mobile phone battery chargers which can also be easily adapted for other mobile devices. The energy harvesting circuit is capable of making Maximum Power Point Tracking (MPPT) and also has a built-in battery protection function. A polycrystalline solar panel which supplies an average of 400mW (under 1 sun solar insolation) of power was selected for use in the proposed circuit. MPPT in the circuit is achieved by using the constant voltage tracking principle which is a non-complex yet highly efficient MPPT control method. It is implemented with purely discrete analog components with ultralow power consumption. The proposed design is extremely compact and is feasible for commercial applications. The solar energy harvesting circuit consumes less than 330µW of power and achieves an overall efficiency of approximately 80-90%. Keywords - Analog Maximum Power Point Tracking Circuit, Mobile Phone Charger, Photovoltaic Energy Harvesting Circuit, Ultra-low Power MPPT Circuit


395 Characteristics Evaluation and Parameter Extraction of a Solar Array based on Experimental

Analysis Bidyadhar Subudhi and Raseswari Pradhan Dept. of Electrical Engg., )ational Institute of Technology ()IT), Rourkela, India This paper proposes a Newton-Raphson based parameter extraction method based on experimental analysis for modeling of a PV panel. In this method, pre-knowledge of open-circuit voltage, short-circuit current, maximum power point voltage and current is not necessary. Hence, the proposed parameter extraction method and analysis described in this paper can be suitably employed to obtain the panel dynamics for a PV panel without any information of voltage, current or power rating. Together with the parameter extraction, I-V and P-V characteristics and maximum power point tracking analysis has also been conducted to the PV panel.

159 Asynchronous Generator with Battery Storage for Standalone Wind Energy Conversion

System Shailendra Sharma, Student Member, IEEE and Bhim Singh, Fellow, IEEE Department of Electrical Engineering, Indian Institute of Technology Delhi, Haus Khas, )ew Delhi-110016, India This paper deals with the implementation of a voltage and frequency controller (VFC) for an isolated asynchronous generator (IAG) based stand-alone wind energy conversion system (SWECS) with a battery energy storage system (BESS) feeding three-phase four-wire loads. The control algorithm for VFC is based on a low pass filter (LPF) for estimation of reference source currents. The VFC is realized using a voltage source converter (VSC) with a BESS at its dc bus and a non-isolated T-connected transformer to feed three-phase four-wire consumer loads. Test results are presented to demonstrate the performance of a proposed VFC for an IAG in the wind power generation. Keywords - Asynchronous Generator, Battery, Transformer, Voltage Source Converter, Wind Energy.

163 Design and Dynamic Power Management of Energy Storage System for Wind Plant

Duong Tran, Student Member, IEEE, Haihua Zhou, and Ashwin M. Khambadkone, Senior Member, IEEE 4 Engineering Drive 3, ECE, )ational University of Singapore, Singapore 117576 To integrate wind energy into power grid, energy storage system (ESS) is needed to smooth out fluctuations of wind power output. As power and energy requirements for energy storage in wind application are high, ESS cost is high. In this paper, selection of storage technologies and sizing of storage units in ESS to achieve high power, high energy capacity and low cost are presented. A Dynamic Power Manager is introduced for management of power dynamics and constraints of energy storages inside ESS, while improving controllability of wind plant at PCC. Simulation result shows that the Dynamic Power Manager is effective to manage the ESS and improve power at PCC with RMS ripple down from 17.97 % to 6.42 %. Keywords - Dynamic Power Management, energy storage system, micro-grid

75 Investigation of Power Converter Topologies for Solar Powered Hydrogen Reformer Wei Jiang1, Member IEEE, Job Brunet2, Member IEEE, Babak Fahimi3, Senior Member IEEE 1Smart Energy Laboratory School of Energy and Power Engr. Yangzhou University, Yangzhou, China 2William-Pyro Inc. 200 Greenleaf Street Fort Worth 3Renewable Energy and Vehicular Technologies Lab Department of Electrical Engineering University of Texas, Richardson


Hydrogen offers higher energy density than conventional hydrocarbon based fossil fuels, and yields zero emission through various thermal and electro-chemical process. Therefore, hydrogen is considered as an attractive fuel candidate for the future energy systems. Hydrogen can be harvested from water or hydrocarbon molecules through different reforming process. Among a variety of fuel candidates, ethanol fuel can yield high hydrogen energy output per electric energy input. In this paper, solar power is harvested from the environment, and is used to supply an ethanol fueled hydrogen reformer; with the target in achieving high electric potential field to generate cold plasma, different power converter topologies are investigated and evaluated with experimental iterations; the prototypes of the topologies under study are built and experimentally verified in order to further achieve simple engineering and effectiveness in cold plasma generation; eventually the flyback topology is chosen for the reformer and satisfactory results are collected.

Session Power Semiconductors, Passive Components and Packaging Technologies I (PSPC-I) Date/Time Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue Ballroom 2 Chair Yung C. Liang, National University of Singapore, Singapore

77 An On-Chip Current Sensing Technique for Hysteresis Current-Controlled Boost Converters

M.L. Chiu and H.P. Chou Graduate Student Department of Engineering and System Science )ational Tsing Hua University, Hsinchu, Taiwan A novel on-chip current sensing technique suitable for hysteresis-current-controlled (HCC) boost converters is presented. The proposed circuit senses low-side current information and charge/discharge a capacitor to generate the hysteresis band for the current mode controller. The proposed circuit does not need an operational amplifier; thus, it is simple and does not reduce the power efficiency. Simulation results verified the design and showed a good sensing accuracy. The chip is implemented with TSMC 0.25-µm CMOS HV processes. Keywords- Current sensing circuit; DC/DC Booster; Hysteresis Control.

158 Analysis of Output Capacitor Parasitic Effects to Output Voltage Ripple on Power Converter

Sheng-Yuan Ou, Member, IEEE, Huei-Fa Su and Cheng-Yu Tang, Student Member Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan

This paper provides analysis of output capacitor parasitic effects to output ripple on power converter and verification is made by experiments, thereby giving suggestions to persons skilled in the related art. Generally, a capacitor roughly consists of a nominal capacitance, an equivalent series resistance (ESR) and an equivalent series inductance (ESL) where ESR and ESL are called the parasitic elements. According to the parasitic effects, this paper distinguishes the associated capacitors into three models for steady state analysis, and each model can be divided as three states corresponding to the comparison two ripple magnitudes, except first model. Also, the transient responses with output capacitors are analyzed to verify the effects further. Finally, experimental results confirm the theoretic analysis.

288 A Bovel Soft-Switching Grid-Connected PV Inverter and its Implementation

Minjie Chen, Xutao Lee and Yoshihara Tsutomu Graduate School of Information, Production and Systems, Waseda University, Japan This paper proposes a novel soft-switching PV inverter formed by a ZVT-PWM boost converter, a ZVS-ZCS-PWM buck converter and a low frequency full-bridge inverter. The ZVT-PWM boost converter maintains the dc-bus voltage and provides an auxiliary current source for the soft-switching cell of the buck converter. The buck converter consists of a main switch and an auxiliary switch, with ZVS and ZCS features respectively, which generates a semi-sinusoidal current output. The semi-sinusoidal current is inverted into


sinusoidal and fed to the utility grid by the low frequency full-bridge inverter. The overall efficiency is improved and the size is dramatically reduced due to high frequency operation. The operating principles are presented and the circuit is implemented to a 1000W prototype machine. The experimental results with a maximum overall efficiency up to 97% at 100 kHz, about 1.5%’s improvement compared to the hard-switching one, verify the proposal. Keywords - Grid-Connected PV Inverter, ZVT-PWM, ZVS-ZCS-PWM, boost converter, buck converter, full-bridge inverter.

492 Indirect Space Vector Modulated Three Phase ac-ac Matrix Converter Under Abnormal Input

Conditions

)guyen Khanh Tu Tam, )guyen Van )ho and Huynh Thai Hoang Faculty of Electrical & Electronics Engineering, Ho Chi Minh city University of Technology, 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City,Viet)am Matrix converter is a single-stage Converter which directly connects a three- phase voltage source to a three- phase load without dc – elements. Therefore, the ac line side abnormal input can deteriorate its output characteristics. In this paper, the indirect space vector modulation method of the matrix converter is investigated and a feed-forward compensation technique to prevent the input voltage harmonics from propagating onto its output characteristics is proposed. Some simulation and experimental results are also presented in this paper to verify the effectiveness and feasibility of the proposed compensation strategy.

81 P-buried Region Effects on Breakdown Voltage of BPT-TIGBT Structure Montree Saenlamool, Karoon Saejok, Opas Trithaveesak, Ekalak Chaowicharat, Charndet Hruanun and Amporn Poyai Thai Microelectronics Center (TMEC), )ational Electronics and Computer Technology Center ()ECTEC), )ational Science and Technology Development Agency ()STDA) 51/4 Moo 1, Wangtakien District, Amphur Mueang, Chachoengsao 24000, Thailand

In this paper, we introduced a P-buried (Pb) layer under trench gate which relieved the electric field crowding in the Non Punch Through Trench gate Insulated Gate Bipolar Transistor (NPT-TIGBT) structure. The Pb layer, with carrier concentration of 5x1016 cm-3, was created underneath the trench gate within the n-drift layer. In this way, the concentration of electric field at the trench bottom corner decreased. As a result, the forward breakdown voltage characteristics of NPT-TIGBT improved. The structures were proposed and verified by T-CAD Sentuarus simulation. From the simulation results, the forward breakdown voltage increased by approximately 25% compared with conventional NPT-TIGBT. Furthermore, the forward current did not degrade the on-state voltage drop. In the experiments, the Pb layer was formed by boron implantation energies above 1 MeV with the Varian Genus 1520 High Energy Ion Implanter. The doping profiles were measured and analysed by SIMS. Keywords - NPT-TIGBT, Breakdown voltage, P buries, Boron implantation, T-CAD, Sentuarus simulation, Electric field crowding, Insulated gate bipolar transistor, Trench gate

Session Motion Drives and Motion Control IV (MDMC-IV) Date/Time Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue Connection Room 1 Chair Sanjib Kumar Sahoo, National University of Singapore, Singapore 308 An Improved SVM-DTC based Induction Motor Drive Scheme using d-SPACE Mrs. S. V. Jadhav, Mr. M. Mohan Krishna Reddy, Dr. B. ). Chaudhari Department of Electrical Engg. College of Engineering Pune India


This paper presents design and implementation of a Direct Torque Controlled Induction Motor Drive System. The platform used for real time control is d-SPACE ds-1104 along with MATLAB-SIMULINK. Control method is based on Space Vector Modulation (SVM) based Direct Torque Control (DTC).The reference control input is stator voltage vector. It is generated with decoupled control of the amplitude and the angle of the stator flux. This generation of control voltage gives better performance and takes less computational time as compared to other methods. It involves a simple structure with only one Proportional-Integral (PI) controller which is implemented for independent torque and flux control. Stator flux angle reference is generated using the relationship between the instantaneous slip angular frequency and rotor angular frequency. From this, reference stator flux vector is generated in stationary reference frame to find the control voltages. The amplitude of the reference stator flux is kept constant at rated value. The scheme is implemented to prove its ability to respond in real time. Experimental results for dynamic and steady state conditions with load variation, and low speed operation are presented. Keywords - Direct Torque Control(DTC) Space Vector Modulation (SVM), decoupling the amplitude and angle of the stator flux (AAS), d-SPACE

329 Design and Implementation of a Direct Torque Controlled Interior Permanent Magnet

Synchronous Motor Drive Based on a Bovel Flux Model Ming-Tsan Lin and Ching-Guo Chen Tung )an Institute of Technology 152, Sec. 3, PeiShen Rd., ShenKeng )ew Taipei City, 222 Taiwan, R.O.C. This paper studies a direct torque controlled interior permanent magnet synchronous motor (IPMSM) drive based on a novel flux model of the motor. First, a full digital PMSM drive is implemented based on a TMS320-F2808 DSP. Next, the paper studies the direct torque controlled method. By using the novel flux model, the controlled voltages can be decided correctly to eliminate the flux and torque errors. Moreover, the maximum torque per ampere control method is built on the new flux model. Then the optimum flux and torque angle commands can be obtained from the control method. In order to obtain the smooth torque of the motor, the space vector PWM control technique is used to reduce the ripples of the torque and currents. In addition, the estimators of flux angle and rotor speed are implemented by estimating the fluxes of the motor to omit encoder. Finally, some experimental results validate the correctness and the feasibility of the proposed control method.

442 Optimal Control Design for Switched Reluctance Machines with Right-sized Modeling Yang Ji and Johann Bals German Aerospace Center Institute of Robotics and Mechatronics compared to the traditional electric machines, switched reluctance machines (SRM) exhibit significant improvement on production, robustness and efficiency. However, some inherent drawbacks of those kinds of machines such as noise and high torque ripple at low speed have to be well managed. Moreover, improved performance such as higher energy density, better dynamic response are to be expected. To solve these challenging issues, dedicated control strategies usually provide more efficient ways, in contrast to other methods like mechanical re-design. Accurate and right-sized mathematical models are crucial for the controller synthesis using iteration based multiobjective optimization approach. Due to the strong nonlinear characteristics of SRMs, deriving the right-sized models of a SRM is really a challenging work. In this paper, the analytical representation of SRM magnetic characteristics with adjustable complexity are derived and used for multi-objective optimization based controller synthesis. Furthermore, inverse modeling technique is applied to achieve the exact mapping between commanded current and torque for the close-loop current control, which can significantly improve the system performance relating to torque ripple, control accuracy, etc. The simulation results of a 22KW 16/12, 4 phase SRM is presented to illustrate the proposed design approaches.

429 AC Induction Motor Control Using Robust Current Controllers Petr BLAHA and Pavel VÁCLAVEK Center for Applied Cybernetics Brno University of Technology Brno, Technická 4


In the present work, the robust current controller design for AC induction motor is addressed. It replaces current PI controllers in classical vector control algorithm where the controllers operate in coordinates fixed to rotor flux. AC induction motor parameters are treated as parametric uncertainties. Their mutual dependencies are studied so as to simplify complex AC induction motor state space description and to make the controller design using D-K iteration treatable. Imprecision in decoupling is partially treated. The newly designed controller is compared with the classical vector control algorithm.

Session Distributed Generation and Smart-Grid II (DGSG-II) Date/Time Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue Connection Room 2 Chair Wei Jiang, Yangzhou University, Yangzhou, China

486 Review of Power Flow Studies on Distribution Betwork with Distributed Generation K. Balamurugan and Dipti Srinivasan )ational University of Singapore With the perspective of the emerging Smart grid concept, tomorrow’s distribution network will require repeated and fast load flow solution that must be resolved as efficiently as possible in some applications particularly in distribution planning, automation, optimization of power system etc. This necessitates the continued search for accurate and fast power flow algorithms for distribution network. This paper presents a review and summary of research developments in the field of distribution network power flow which is an essential part of development of effective smart distribution system analysis tools. Different solution strategies including the modeling of distributed generation sources involved in the distribution network power flow are presented. The solution techniques of distribution network power flow problem are classified under two major reference groups namely phase frame approach and sequence frame approach. The Forward and Backward sweep method, Compensation method, Implicit Gauss method, modified Newton or Newton like methods or any other miscellaneous power flow methods are the different algorithms used under each reference frame. Attention is given to the techniques to deal with balanced/unbalanced, radial/weakly meshed/mesh configuration, with or without Distributed Generation (DG) and convergence criteria.

202 Optimal Operation of Thermal Generating Units and Smart Houses Tomonori Goya1, Tomonobu Senjyu1, Atsushi Yona1, Kosuke Uchida1, Toshihisa Funabashi2 and Chul-Hwan Kim3 1The Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan. 2Meidensha Corporation, Tokyo 141-8565, Japan. 3The School of Electrical and Computer Engineering, Sungkyunkwan University, Suwon City 440-746, Korea, and )PT Center

Recently, the deregulation and liberalization in power market increase the competition in retail and power sector. Therefore power company needs to reduce operational cost and maximizes the profit by operating generator with higher efficiency. On the other hand, energy consumption is increasing rapidly due to the proliferation of all-electric houses. So the controllable loads, such as electric water heater, heat pumps, and electric vehicles are introduced to power systems. In this paper, the controllable loads, such as heat pump and electric vehicle, are introduced. Moreover, thermal units and the controllable loads are operated in coordinated manner to reduce the total cost of thermal units in the supply side. In demand side, the configuration of electric cost based on the interconnection point power flow is introduced to reduce the electric cost in demand side. Simulation results show the validation of the proposed method and validate the performance and effectiveness of the proposed algorithm of thermal units in supply side and the configuration of electric cost in demand side.


Keywords - smart grid, controllable load, thermal unit commitment, renewable energy, interconnection point power flow

175 Multi-Agent System for Demand Side Management in Smart Grid

T. Logenthiran, Dipti Srinivasan and Tan Zong Shun Department of Electrical and Computer Engineering )ational University of Singapore Singapore This paper presents a Multi-Agent System (MAS) for Demand Side Management (DSM) in smart grid which uses an energy market for resource allocation. The multi-agent system contains Load Agents, Generator Agents and DSM Agent, which provides an electronic auction platform. The automation of the demand side management through the multi-agent system is equipped with an intelligent strategy which allows controllable devices to dynamically react to market changes and adapt their bidding behaviours accordingly. The agents are able to shift energy demand within certain boundaries from peak hours to off-peak hours to minimize the operational cost of the system. Simulation studies were carried out on the developed multi-agent system and the results show that the proposed approach provides a smoothed load curve for the whole system while operational cost and peak demand are reduced. Keywords - Demand side management; Smart grid; Microgrid; Multi-agent system; Energy market.

214 Fuzzy Logic Controller based 3-ph 4-wire SHAF for Current Harmonics Compensation with

id-iq Control strategy Using Simulation and RTDS Hardware Suresh Mikkili and A.K. Panda Department of Electrical Engineering, ).I.T Rourkela

The main objective of this paper is to develop Fuzzy controller to analyse the performance of instantaneous real active and reactive current (id-iq) control strategy for extracting reference currents of shunt active filters under balanced and un-balanced voltage conditions. When the supply voltages are balanced and sinusoidal, then all control strategies converge to the same compensation characteristics. However, when the supply voltages are distorted and/or unbalanced sinusoidal, these control strategies result in different degrees of compensation in harmonics. The p-q control strategy unable to yield an adequate solution when source voltages are not ideal. Extensive simulations are carried out with Fuzzy controller for Id-Iq control strategy under different main voltages. The 3-ph 4-wire shunt active filter (SHAF) system is also implemented on a Real Time Digital Simulator (RTDS Hardware) to further verify its effectiveness. The detailed simulation and RTDS Hardware results are included. Keywords - Harmonic compensation, SHAF, id-iq control strategy, Fuzzy Controller and RTDS Hardware.

441 A Ubiquitous Power with DC Micro-Grid for Sectional Compact Emergency Shelters

Keiichi Kato, Masayuki Okamoto, Eiji Hiraki, Toshihiko Tanaka, Makoto Koganei and Fusanori Miura Graduate School of Science and Engineering, Yamaguchi University 2-16-1, Tokiwadai, Ube, Yamaguchi 755-8611, Japan This paper proposes a mobile power for the Sectional Compact Emergency Shelter (SCES), which is used under the great disaster. The proposed mobile power consists of the Fuel Cells (FCs), photovoltaic cells (PVs) and lithium-ion rechargeable batteries. This mobile power is constructed in a container car. Therefore, the constructed mobile power is easily moveable and constructible with the SCESs. The authors have named it “a ubiquitous power.” The FCs in the ubiquitous power can supply electrical power and waste-heated water. The wasteheated water can be used to the SCESs for a floor heating in winter. The lithium-ion rechargeable batteries level the difference between generated power and consumed power in the SCESs. The number of the SCESs, which proposed one ubiquitous power can supply power continuously, is decided considering both the depth of discharge (DOD) of the batteries and the thermal energy of the waste-heated water from the FCs. It is shown that proposed one ubiquitous power can supply twenty SCESs in winter in Japan.


Keywords - large-scale disaster, Sectional Compact Emergency Shelter, DC micro-grid, fuel cells, photovoltaic cells, cogeneration

Session Renewable Energy Technologies II (RET-II) Date/Time Wednesday, 07 December 2011/11:00 – 12:40 hrs Venue Connection Room 4 Chair Guan-Chyun Hsieh, Chung Yuan Christian University, Taiwan

113 A Study of Fuel Cell Z-Source Boost Converter: Considerations on Design and

Implementation

Hung-I Hsieh1, Chin-Hao Chang2 and Guan-Chyun Hsieh2 1Department of Electrical Engineering, )ational Chiayi University, Taiwan (ROC) 2Department of Electrical Engineering, Chung Yuan Christian University, Taiwan (ROC)

A parameter estimation of a fuel cell Z-source boost converter (FC-ZBC) based on the energy transfer in Z-components is proposed. The interrelation of ripple current in Z-inductor and the voltage droop in Z-capacitor dependent on the output power need is actually the major pillars of the system performance. In addition, the significant issue is the huge conduction current through the power switch in shoot-through state, which may deteriorate the power efficiency of FC-ZBC. In this paper, three kinds of conduction modes, DCM, BCM, and CCM in FC-ZBC are respectively examined to estimate appropriate Z-inductor and Z-capacitor well featuring the FC-ZBC performance. A design example with the estimated parameters shows quite well performance in experiment and meets the proposed design approach in practice.

120 Three-Phase Photovoltaic Grid-Connected Inverter using dSPACE DS1104 Platform Z A Ghani, M A Hannan, A Mohamed and Subiyanto Dept. of Electrical, Electronic & Systems Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

This paper presents a simulation modeling for the hardware development of photovoltaic three-phase voltage source inverter utilizing dSPACE DS1104 controller platform. The controller links the MATLAB/Simulink simulated model to the inverter prototype for operation in real-time. It generates a sinusoidal pulse-width modulation (SPWM) signals for switching devices (IGBTs) with the accomplishment of fuzzy logic controller and Park transformation. Consequently, the inverter provides power not only to the local loads but also feeds the available excess power to the grid. The current and voltage control strategies which are implemented by using the fuzzy logic controller regulate the 50 Hz sinusoidal ac output current and voltage for both modes of operations namely isolated and grid-connected mode. The simulation was carried out with the PV generator simulator to facilitate the real PV power transfer to the local loads and grid. With the excellent results of 2.48% in the total harmonic distortion (THD) of output voltage, suggests that the proposed control system exhibits a good performance, thus can be translated into a prototype by utilizing the dSPACE platform. The simulation results waveforms such as ac output voltages, current and system power flow are presented to validate the efficacy of the control system.

121 Analysis of Multi-power Sources Energy Management System for Electric Hybrid Vehicle M A Hannan1, F A Azidin1,2 and A Mohamed1 1)ational University of Malaysia, Malaysia 2Universiti Teknikal Malaysia Melaka, Malaysi This paper presents a new energy management system (EMS) for small hybrid electric vehicle (HEV), which utilizes energy from the combination of battery, fuel cell (FC) and super capacitors (SC). These alternative energy sources are excellent potential solution to the ever-rising price of petrol. The major focus of this paper is the energy management system, which consists of a strategy to coordinate the three different sources. This novel strategy for small HEV allowed the model to meet various load demand condition of an


electric scooter or any three-wheeled vehicles. The model is simulated in MATLAB SIMULINK and its performance is analyzed by using the European test drive cycle (ECE-47). The simulation model system includes three renewable energy sources, EMS, DC machine, vehicle speed and feedback control system. The comparison result shows that the model capable to perform the proposed driving cycle.

141 Deadbeat Current Control of LCL-Filter for Grid Connected Three-Phase Voltage Source

Inverter Katsumi )ishida1, Tarek Ahmed2, Mutsuo )akaoka3 1Assiut University 2Ube )ational College of Technology 3Kyungnam University

In this paper, an effective deadbeat current control scheme for a third-order inductor-capacitor-inductor(LCL) filter in voltage source inverter applications of wind energy is developed. The novel scheme is not only used to damp the LCL resonance but also to achieve time-optimal responses of the grid-side currents. Based on the theoretical analysis of the LCL-filter with the deadbeat current control algorithm in the α-βstationary reference frame, the settling time is set to three times of the sampling period. In addition, the state identification algorithm is only adopted in order to achieve the detection of the inverter currents via two current sensors. The effectiveness of the proposed deadbeat current algorithm is substantially confirmed by the simulation and experimental results. 74 Cooperative Control of Interfaced Inverter with PV System and Existing Voltage Control

Devices Considering Forecasted Error in Distribution System Masato Oshiro1, Tomonobu Senjyu1, Atsushi Yona1, )aomitsu Urasaki1, Toshihisa Funabashi2, and Chul-Hwan Kim3 1The Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japn. 2Meidensha Corporation, Tokyo 141-8565, Japan. 3The School of Electrical and Computer Engineering, Sungkyunkwan University, Suwon City 440-746, Korea, and )PT Center In recent years, distributed generation (DG) and renewable energy source (RES) are attracting special attention to distribution systems. RES such as photovoltaic (PV) system are used as a source of green energy. However, the large amount of distributed generation causes voltage deviation beyond a statutory range in distribution systems. This paper proposes a methodology for voltage control by using inverters interfaced with DG and tap changing transformers. The proposed method which uses a one-day schedule of voltage references for the control devices are determined by an optimization technique based on forecast values of load demand and PV power generation. However, if the forecast value includes a forecast error, there is possibility that voltage control performance is affected. To solve this problem, this paper introduces the re-planning of control reference schedule in order to reduce the forecast error.

Session Poster Session I (PS-I) Date/Time Wednesday, 07 December 2011/14:00 – 15:40 hrs Venue Ballroom 2 Chair Yen Kheng Tan, Nanyang Technological University, Singapore

117 A Modular Matrix Converter for Transformer-less PMSG Wind Generation Systems

S.D.G. Jayasinghe, Student Member, IEEE, D.M. Vilathgamuwa, Senior Member, IEEE School of Electrical & Electronic Engineering, )anyang Technological University, Singapore An offshore wind turbine usually has the grid step-up transformer integrated in the nacelle. This increases mechanical loading of the tower. In that context, a transformer-less, high voltage, highly-reliable and


compact converter system for nacelle installation would be an attractive solution for large offshore wind turbines. This paper, therefore, presents a transformer-less grid integration topology for PMSG based large wind turbine generator systems using modular matrix converters. Each matrix converter module is fed from three generator coils of the PMSG which are phase shifted by 1200. Outputs of matrix converter modules are connected in series to increase the output voltage and thus eliminate the need of a coupling step-up transformer. Moreover, dc-link capacitors found in conventional back-to-back converter topologies are eliminated in the proposed system. Proper multilevel output voltage generation and power sharing between converter modules are achieved through an advanced switching strategy. Simulation results are presented to validate the proposed modular matrix converter system, modulation method and control techniques. Keywords - Modular matrix converter, transformer-less grid connection, wind power.

84 Bovel Evaluation Method for the Volume of Transformers with Various Magnetic Cores Tomoyuki Hatakeyama and Kenichi Onda Hitachi Research Laboratory, Hitachi, Ltd. 1-1, Omika-cho 7-chome, Hitachi, Ibaraki, Japan

Generally, as operating frequency becomes higher, magnetic components get smaller and lighter. However, higher frequency leads to larger core loss and copper loss. Therefore, the appropriate material of the core and operating frequency needs to be determined to realize well-designed magnetic components. So far, a silicon steel sheet has been used in the low frequency range for large-capacity conversion systems, and ferrite has been used in the high frequency range for smallcapacity conversion systems. Recently, new magnetic cores with, for example, amorphous and nanocrystalline materials have been developed that have high saturation magnetic flux density and low core loss. However, the appropriate operating frequency for each magnetic core has not been determined quantitatively. In this study, a novel evaluation method for the volume of transformers using various magnetic cores is proposed. As a result, the volume indicator of the nanocrystalline material has the lowest volume in the range of 1.5 – 40 kHz, and it is the best to operate the nanocrystalline material at 5 kHz for both high efficiency and small size when the saturated temperature rise is 40 K. Keywords–Nanocrystalline material, high power density, high frequency transformer design.

407 Considerations about Sensorless Control of Permanent Magnet Synchronous Motors at low

speed and standstill for Wheel Mounted Drive of Tram David Uzel, David Vosmik, Zdenek Peroutka and Martin Sirovy Regional Innovation Centre for Electrical Engineering (RICE), U)IVERSITY OF WEST BOHEMIA This paper deals with considerations about features of sensorless control for gearless wheel mounted drives of trams. This paper presents and compares properties of IPMSM and PMSM drives with pulsating injection sensorless control at low speeds. The proposed sensorless control and its features are verified by tram drive simulations and laboratory tests.

102 A Bovel Voltage-Boosting Converter Based on Charge Pumps with One Inductor Inserted K. I. Hwu1, W. C. Tu1 and Jenn-Jong Shieh2 1Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan 2Department of Electrical Engineering Ta Hwa Institute of Technology, Taiwan

A novel voltage-boosting converter, based on charge pumps with one inductor inserted, is presented herein. This converter has a simple operating analysis—if such a converter operates in the continuous conduction mode (CCM), only two operating modes exist. Furthermore, the power switches used in such a converter are easy to drive—only two half-bridge gate drivers and one low-side gate driver are needed. In this paper, a brief illustration of basic operating principles is firstly given, and secondly some experimental are provided to demonstrate the effectiveness of the proposed topology. Keywords- Voltage-boosting converter, charge pump, inductor.


103 A Simple Step-Up Converter K. I. Hwu1, Chun-Chen Lin1 and Jenn-Jong Shieh2 1Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan 2Department of Electrical Engineering Ta Hwa Institute of Technology, Taiwan A simple step-up converter, based on charge pumps with one inductor inserted, is presented herein. The proposed converter has individual simple operating analyses—if this converter is operated in the continuous conduction mode (CCM), only two operating modes exist. Furthermore, the power switches used in the proposed converter is easy to drive—only two halfbridge gate drivers and one low-side gate driver are needed. In this paper, a brief illustration of basic operating principles of the proposed converter is firstly given, and secondly some experimental results are provided to verify its effectiveness. Keywords - Step-up converter, charge pump, inductor.

111 Applying Asymmetrical Half-Bridge LCC Resonant Inverter to EEFL Lighting Ballast

K. I. Hwu, W. C. Tu and Kuo-Yang Chen Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan

In this paper, an asymmetric half-bridge LCC resonant inverter is presented, which is the kernel of the proposed lighting ballast that is used to drive an external electronic fluorescent lamp (EEFL). This lighting ballast contains three power stages if dimming is necessary; otherwise it contains two power stages only. The first power stage is constructed by a traditional boost converter with power factor correction (PFC), and such a converter is operated in the transient mode (TM) with the DC output voltage 390V. The second power stage is built up by a buck converter is used to control the duty cycle such that the corresponding output voltage can be changed and hence dimming of the EEFL can be achieved. The third power stage is established by an asymmetric half-bridge LCC resonant inverter operating under a fixed switching frequency with a fixed duty cycle of about 50%. Via LCC resonance, the power switches of this inverter are operated in zero voltage switching (ZVS) so as to reduce the switching loss, and at the same time, the inherent high voltage conversion characteristics make the voltage conversion gain is larger than one such that the turns ratio of transformer can be reduced. Most importantly, as the EEFL is operated on the rated conditions, i.e., without dimming, the second power stage is to be bypassed, thereby causing the corresponding efficiency to be upgraded. The basic operating principles and corresponding mathematical deductions of the proposed inverter are described, and applied to the constructed EEFL lighting ballast that is verified by some simulated and experimental results. Keywords - Asymmetrical Half-Bridge LCC Resonant Inverter, EEFL Lighting Ballast.

6 A Bovel ZVS-ZCS Bi-directional Flyback DC-DC Converter For Low power Application

V.V.SUBRAHMA)YA KUMAR.BHAJA)A1, S.RAMA REDDY2 and P.CHA)DRA SEKHAR1

1Research scholar, EEE department, Bharath University, Chennai, India. 2Professor, EEE Department. Jerusalem College of engineering, Chennai,India A new ZVS-ZCS bidirectional flyback DC-DC converter is proposed, which provides low output voltages 24V-60V. With proposed ZVS-ZCS concept, the MATLAB simulation results of the applications to a battery application have been obtained and compared with those of ZCS flyback bidirectional converter. In addition to this an experimental setup has been developed. Experimental results are compared with simulation results. Keywords-component,ZVS,ZCS,ZVS-ZCS,DC-DC converter.

385 Direct Load Angle Control of Three Phase Induction Motor Drives T. Vinay Kumar, Student Member, IEEE and S.Srinivasa Rao, Member, IEEE )ational Institute of Technology, Warangal, A.P., I)DIA


In this paper, a direct load angle (DLA) control method for three phase induction motor drives is proposed. It is based on control of incremental change in load angle. This method offers constant switching frequency at different operating conditions. The torque control is achieved without losing the benefits of direct torque control (DTC) by reference stator flux angle, which is sum of load angle and rotor flux angle. Proposed DLA control method is applied to two level and three level voltage source inverter fed induction motors and results are presented. From the simulation results it is found that the proposed DLA control scheme impressively reduced the torque and flux ripples when compared with conventional DTC.

59 A Flexible Dynamic Behavior Model of In-ductors to Link Time Domain Simulation with

Empirical Loss Equations That is In-stantaneous dB/dt and B(t) Dependent for SPICE

Simulation Long-Ching Yeh Department of E.E. )ational Central University 300, Jongda Road, Chungli City. Taoyuang, 32001, Taiwan. A flexible dynamic behavior inductor circuit model that links the time domain simulation with dB/dt and B(t) dependent empirical loss equations is proposed. For the first time, this model automatically detects dB/dt and B(t) and calculates the dynamic resistance value for a resistor that is put in parallel with an inductor whose inductance is also calculated according to its dependency on B(t) and operating frequency, all in a time domain. This circuit model is flexible since one can change the loss formula easily by replacing a “resistor” expression of an ABM (Analog Behavior Model) in the circuit. The circuit model is verified both with sinusoidal and square wave excitations at different frequencies and different excitation levels. The simulated power loss data are compared with experimental data. It shows an excellent match for all the three types of empirical equations tested in this inductor circuit model. However, the impedance behavior is found to be dependent on empirical loss equations. This proposed model is useful for circuit designs that use inductors.

85 Modelling and Analysis of Multistage Switched-Capacitor-Voltage-Multiplier Boost DC-AC

Inverter Yuen-Haw Chang Department of Computer Science and Information Engineering, Chaoyang University of Technology, Taichung, Taiwan.

A closed-loop mc×nc -stage switched-capacitor-voltage-multiplier boost inverter (SCVMI) is proposed by combining phase generator and sinusoidal-pulse-width-modulation (SPWM) control for low-power boost DC-AC conversion/regulation. The power unit contains: SCVM booster (front) and H-bridge (rear). This booster consists of two mc -stage SC cells and two nc -stage SC cells in series, and these cells are operated with two-phase interleaved non-overlapping clocks of phase generator for a conversion ratio of mc×nc at most. The H-bridge consists of 4 switches, and these are controlled by SPWM to realize full-wave DC-AC operation and output regulation. Further, the modelling and analysis of SCVMI are included. Finally, the closed-loop SCVMI is simulated, implemented, and tested. All the results are illustrated to show the efficacy of the proposed scheme.

378 A Bovel Sliding Mode Controller for Induction Motor DTC Drive with Smooth Performance Mrs. S. V. Jadhav, Mr. M. Mohan Krishna Reddy, Dr. B. ). Chaudhari Department of Electrical Engg. College of Engineering Pune India Speed control of Space Vector Modulation (SVM) based Direct Torque Control (DTC) Induction Motor drives depends on effective generation of control input. Hence, stator voltage vector calculation plays an important role in the drive performance characteristics such as smooth operation, better dynamic and steady state behaviour etc. A scheme of generation of control input involving decoupled control of the amplitude and the angle of reference stator flux vector (AAS) is simple for real time implementation. Keeping the amplitude of the reference stator flux constant at rated value, the relationship between instantaneous slip


angular frequency and rotor angular frequency is used in adjustment of stator flux angle reference. Thus, AAS algorithm has only one controller and hence requires less computational time. Further, it gives reduced stator flux drop and has satisfactory steady state behaviour. Further, Sliding Mode Controllers (SMC) provide robust, fast and accurate torque and flux control but have disadvantage of high chattering. In this paper, a novel SMC is proposed along with AAS which while giving high performance, significantly reduces chattering. d-SPACE ds1104 based hard-ware experimental system is built to demonstrate the effectiveness of the proposed control scheme. Results prove ripple free and smooth operation of the drive, even at low speed. Keywords - Induction Motor (IM), Space Vector Modulation (SVM), Sliding Mode Controller (SMC), decoupling the amplitude and angle of the stator flux (AAS), d-SPACE

92 A Bovel Type Suppressed Boise Peak Dc-Dc Boost Converter Introducing Delta-Sigma

Modulation Technique

Atsushi Hirota1, Soon-Kurl Kwon2, Satoshi )agai1, Srawouth Chandhaket3, and Mutsuo )akaoka2 1Akashi )ational College of Technology Hyogo, Japan 2Kyungnam Univ. Masan, Republic of Korea 3Walailak Univ. Thammarat Province,Thailand Because of achieving high efficiency power conversion, switching power converters are widely used. About the switching power converters, pulse width modulation (PWM) technique is used to produce switching pattern. But this scheme causes large switching noise peak components at the multiple numbers of carrier frequency. And this raises problems of clearing noise regulations. This paper proposes a novel type dc-dc boost converter which is able to suppress switching noise components. The proposed converter introduces delta-sigma modulation circuit. To be used for dc-dc converter, delta-sigma modulation circuit is improved. And it is clarified that the proposed dc-dc converter can reduce switching noise components.

338 Comparative Analysis of Control Strategies for Modular Multilevel Converters A. Lachichi1, Member, IEEE, L. Harnefors2, Senior Member, IEEE 1ABB Corporate Research Centre, SE-721 78 Västerås, Sweden 2ABB Power Systems/HVDC, SE-771 80 Ludvika, Sweden Performances analysis of a modular multilevel converter using two different control strategies is presented. The first approach uses a voltage control with a feedback loop on each individual cell to assure cell’s voltage balancing. Nonetheless, this latter can be affected by the total cell’s voltage ripple if not compensated. As a consequence, low frequencies are injected in the phase output voltage. To overcome this drawback, the voltage references are modified accordingly to compensate for the voltage ripple and reject low frequencies. A circulating current control is necessary in this approach to reduce harmonics contents in the arm’s current. The second approach uses the energy as an image of the state of the system to assure the voltage balancing between the cells. In this method, even though there is no need to use a circulating current controller, the arm’s currents are exempt of the 2nd harmonic. Simulation results are presented to ascertain the operation of the system under steady and unsteady state conditions.

340 Constant Frequency Ripple Regulator Free from Sub-harmonic Oscillation Shohei HIROSE, Taichi KIMURA, Terukazu SATO, Takashi )ABESHIMA and Kimihiro )ISHIJIMA Department of Electrical and Electronic Engineering, faculty of Engineering Oita University 700 Dannoharu Oita, 870-1192, Japan This paper presents a constant frequency ripple regulator free from sub-harmonic oscillation. In order to obtain good transient responses for input voltage and load current changes, a new PWM control method with inherent derivative characteristics is proposed. The ripple regulator presented in this paper consists of a comparator, a simple RC network and an error amplifier, and it can be synchronized with an external clock signal. Since the converter operates at constant frequency, it is easy not only to design an output filter but also to apply to multi-phase converters. Furthermore, the ripple regulator using the proposed method is free


from sub-harmonic oscillation even though it operates at constant frequency. As a result, good transient performances are not spoiled since an additional ramp voltage is no longer necessary.

432 Comparative Study of Digital PI Control Algorithm for Dc-to-dc converters

T. Kuroki, T. Sato, T. )abeshima and K. )ishijima Oita University, 700 Dannoharu, Oita-shi, Oita, 870-1192, Japan In this paper, comparative study of three algorithms of digital PI control, that is, conventional PI control, offset control and modified PI control, is presented. Conventional PI control is subjected to numerical error because the gain must be small in order to move zero of the control to output transfer function to low frequency. To prevent this undesired issue, authors have already proposed novel algorithm called “offset control” in the previous work. Another method (named modified PI control) that improves integral characteristics is proposed in this paper. Three algorithms are described in detail and are implemented for a buck converter. Frequency characteristics of transfer function of control system are measured. To move zero of the transfer function to lower frequency, both modified PI control and offset control are effective. Output voltage load regulation characteristics are also measured and it is found that offset control have the best regulation among three algorithms.

458 An Isolated Bi-directional Soft Switching DC-DC Converter for Energy Storage System and

Its Voltage Stress Suppression Approach

Kazumasa Hirao, Masayuki Okamoto, Eiji Hiraki and Toshihiko Tanaka Graduate School of Sci. and Eng., Yamaguchi University, Ube, Japan In recent years, kinetic energy storage systems with electric double layered capacitor (EDLC) bank have been widely studied and developed for the fuel cell electric vehicles(FCEV). In this paper, a full-bridge/push-pull inverter based isolated bi-directional DC-DC soft switching converter for EDLC interface is proposed. The DC-DC converter mentioned here has the great advantage that the number of the switching power devices can be reduced compared to the conventional full-bridge/full-bridge inverter based DC-DC converter. The lower conduction losses can be achieved by this advantage as well as cost reduction. Though, a non-negligible drawback of the full-bridge/push-pull inverter based DC-DC converter has been revealed that is high voltage stress caused by the voltage ringing through the lossless snubber capacitor and leakage inductance of the high frequency transformer. To eliminate this drawback, a low leakage transformer is implemented to the DC-DC converter. The computer aided simulation and the experimental results demonstrate that the adequacy of the proposed circuit and its voltage suppression technique.

139 A Single-Phase to Three-Phase AC/AC Converter with Regeneration and Adjustable Power

Factor Tsung-Cheng Chen, Gwo-Jen Chiou, Jeng-Yue Chen, Hsien-Te Chiu and Chen-Chih Yang Department of Electrical Engineering, )ational Formosa University, )o.64, Wunhua Rd., Huwei Township, Yunlin 632, Taiwan, R.O.C.

The paper proposes a single-phase to three-phase AC/AC converter with regeneration and adjustable power factor. The circuit architecture is a capacitor connected in series with a single-phase full-bridge and three-phase full bridge. The proposed converter has several advantages such as adjustable power factor, sinusoidal input current, adjustable frequency, single stage control, energy regeneration, and reducing the switching loss etc. Based on a generalized zero vector technique and dead-band control, the converter combines a single-phase converter and three-phase inverter to form a single-stage converter of single-phase AC to three-phase AC. Both VisSim simulation program and DSP TMX320F28335 are employed to achieve digital control for power factor correction and feedback control. Finally, some experimental results are compared with the proposed theory for verification. Keywords - adjustable power factor, energy regeneration, generalized zero voltage space vectors, dead-band control.


345 Experimental Verification of On-line High Efficiency Control for a Weaving Machine

Ryo Tateno1, Jun-ichi Itoh1, )oboru Saitoh2 1)agaoka University of Technology )iigata, Japan 2HOKUETU DE)KE) Co.,Ltd )iigata, Japan This paper demonstrates an on-line control based on the speed sensorless vector control for a weaving machine. The system can achieve high efficiency because the exiting current can be obtained in corresponds to the load torque in real time. The proposed on-line control is analyzed by simulation and verified in experimental on weaving machine. The maximum efficiency is increased by 4.4% in comparison to the direct power grid connection.

348 A Modified Three Dimensional Space Vector based PWM Method for Four-Leg Voltage

Source Inverter Fed Asymmetrical Two-Phase Induction Motor Heli Golwala, R. Chudamani Electrical Engineering Department, Sardar Vallabhbhai )ational Institute of Technology, Surat, India This paper presents a modified three dimensional space vector PWM method for two-phase four-leg voltage source inverter and its realization for asymmetrical two-phase induction motor. The two-phase orthogonal reference voltages are generated using the Volts/Hertz control technique in open loop and are realized using a four leg voltage source inverter. The two phase voltages are obtained by tapping the output from terminal pairs ab and cd. The three dimensional space vector modulation without null vector is used to generate the switching signals for the inverter. This technique reduces the switching losses in the inverter and the experimental and simulation results obtained validate the algorithm used. Keywords - 3 D SVM, Null Vector, 2 Ø Induction motor, 4 – Leg VSI

394 Unregulated Interface Converter Based on Cascaded Switched Capacitor Converters for

Supercapacitors in Alternative Battery Applications Masatoshi Uno and Koji Tanaka Japan Aerospace Exploration Agency Although supercapacitors (SCs) offer many advantages over traditional secondary batteries, they have two major drawbacks—low specific energy and large voltage variations due to cycling. For SCs to be used as alternatives to batteries, a high efficiency power converter that can operate in a wide voltage range is required to maximize the use of the stored energies of SCs. In this paper, we propose an unregulated interface converter using cascaded switched capacitor converters (SCCs) with selectable intermediate taps for SCs in alternative battery applications. The interface converter realizes high efficiency power conversion using the cascaded SCCs, and its voltage conversion ratio is roughly regulated by selectable intermediate taps. Its operation principle and design guidelines are presented in detail. An SC module with a rated charge voltage of 60 V was cycled with a 150 W prototype whose measured peak power conversion efficiency was greater than 95%. The SC module was cycled deeply in the range of 24–60 V while the load/charger voltage was maintained between 24–33.6 V.

21 Discussions of Resonant Bilateral Chopper Utilizing Zero Voltage Switches Keiju Matsui, Takanori Asaba and Masaru Hasegawa Dep,of Electrical Eng, Chubu University With development of various switching devices for high performance, the circuit technologies have been also studied. One of main streams concerns a soft switching technology to mitigate switching stress, leading to the reduction in switching losses or electro-magnetic noise. On the other hand, as a characterized orthodox technology, the existing chopper circuit is used for the electric vehicles, etc. Such technologies have a


tendency to go out of vogue as power supplies for such vehicles. However, as a boost chopper for the battery charger for an electric vehicle, those technologies become a main stream, where a bilateral function is required. With the foregoing in mind, the authors have devised and analyzed the bilateral chopper using the soft-switch technology, which could be applied to a battery charger for an electric vehicle or similar.

435 A Hybrid Vehicle with Reversible Cell and Battery

Tetsuya Watanabe1, Yuuki Machida2, Masayoshi Yamamoto1 1Shimane University 2Sharp Corporation 22-22 )agaike, Abeno, Osaka, 545-8522, Japan The novel hybrid electric vehicle with assumed the battery and the reversible cell is proposed in this paper. The proposed hybrid electric vehicle is named Reversible Cell Electric Vehicle (RCEV). The fundamental concept and the operation principle of RCEV is illustrated and explained. Furthermore, the performance of the proposed RCEV which can drive the same distance in the less number of the hydrogen infrastructure (hydrogen station) as compared with the Fuel Cell Electric Vehicle (FCEV) is discussed. Besides, efficiency and the capacity of the tank when it is introduced a water tank into a car are examined.

257 Classification of Home Appliance Electricity Consumption Using Power Signature and

Harmonic Features Shyh-Jier Huang1, Cheng-Tao Hsieh3, Lun-Chia Kuo2, Chun-Wei Lin2, Che-Wei Chang1 and Shyang-An Fang1 1)ational Cheng Kung University, Tainan, Taiwan 2Industrial Technology Research Institute, Hsin-Chu, Taiwan 3Kun Shan University, Tainan, Taiwan

A method of classifying home appliance electricity consumption is proposed in this paper. With the information retrieved from power signatures and harmonic features, the method excels at its systematic grouping capability of home appliances. It is also beneficial for residents to comprehend their home electricity variations. This proposed approach has been prototyped with hardware realization. Experimental results based on the tested appliance shows its potential of development for the application considered. Keywords - Home appliance, electricity consumption, power signatures.

58 Analysis of Transient Behavior of Class E Amplifier Due to Load Variations Tadashi Suetsugu1 and Marian Kazimierczuk2

1Department of Electronics Engineering and Computer Science Fukuoka University Fukuoka, Japan 2Department of Electrical Enginnering Wright State University Dayton, OH, USA Analysis of transient behavior is important for class power E amplifiers because high peak switch voltage imposed on the transistor during the transient response may destroy the transistor switch. However, transient behavior of class E amplifiers due to load variation has not been analyzed yet. In this paper, analytical expression for transient behavior of a class E amplifier due to load variations is derived using high-frequency and low-frequency circuit models. Derived transient behavior of peak switch voltage was experimentally verified with a 2 MHz class E amplifier. Experimental results achieved good agreement with the theory.

341 An Equivalent Mathematical Model for Soft Starter of High-Voltage Asynchronous Motor Chu Jianxin, Gu Wei, Huang Hui Marine Technology and Control Engineering Key Laboratory,Shanghai Maritime University, Shanghai, China


Working principle of high-voltage asynchronous motor’s soft starter based on switching transformer is analyzed, and equivalent-circuit models of switching transformer and asynchronous motor are established respectively. The switching transformer is represented by A simple series reactance. The model has adequate accuracy for asynchronous motor load. Simulation and experiment is carried out by using the equivalent circuit model of soft starting course of high-voltage asynchronous motor, and a soft starter of the high-voltage asynchronous motor is successfully designed.

106 Sensorless Control of Surface Permanent-Magnet Motor based on Model Reference Adaptive

System

Masaki Ohara and Toshihiko )oguchi, Senior Member, IEEE Shizuoka University, 3-5-1 Johoku, )aka-Ku, Hamamatsu, Shizuoka 432-8561, Japan

This paper describes a new method of rotor position and speed estimation of a surface permanent-magnet synchronous motor based on a model reference adaptive system (MRAS). The proposed method features the MRAS in a current control loop to estimate a rotor position and speed only with current sensors. A transient response of the estimated rotor position and speed in the MRAS determines transient behavior of the sensorless control. For this reason, the important point is to investigate a relationship between an actual and the estimated rotor speed. First, this paper proposes a structure of the sensorless control applied in the current control loop. Next, it proves the stability of the proposed method using hyperstability theory, and presents an optimal method of adjusting the transient behavior of the estimated rotor speed to that of the actual rotor speed with nonlinear compensation. Finally, several experimental results show the performance of the proposed method. Keywords - surface permanent-magnet synchronous motor, rotor position sensorless, model reference adaptive system, transient behavior.

296 Design of the Laboratory Illumination and Practical Measurement by Integrating

Optimization of Power Usage Y. C. Chin, F. H. Chu, S. C. Huang and H. Y. Yang Department of Electrical Engineering Chien Kuo Technology University In this paper, the research is mainly focused on the optimization of average intensity of illumination and power usage the author studied previously to make comparisons viasimulation and actual measurement [1]. In proposed method, the concept of average intensity of illumination is utilized. Then, a set of calculation formula for lighting is derived and the optimization model is used to determine the suitable number of lamps by taking the saving of electric energy into account. The limitations for optimization include the intensity of illumination needs to meet the standards, average intensity of illumination, requirements for distances between lamps, etc. Besides, to simplify the tasks for data input and representation of analysis results, a users’interface implemented with MATLAB and GUIDE is developed for the optimization of average intensity of illumination and power usage. In such way, users could obtain the optimization results in a short time, and easily verify the performance of energy saving and related requirements of illumination design. In this study, the laboratory of electrical machine at the department of electrical engineering in Chienkuo Technology University is used as a simulation and test field. From the actual measured results, the performance of proposed optimization procedure for the design of illumination can be verified, which proves that the total power usage for the design of illumination in the same area would be lower than that designed with the general method.

143 Direct Torque Control of Brushless Doubly-Fed Induction Machines Using Fuzzy Logic

S.J. Fattahi, A.A. Khayyat Sharif University of Technology, International Campus

In this research, a Fuzzy Logic Direct Torque Control (FLDTC) based on stator flux-oriented and machine's relation and equations with voltage and current of both stators have been introduced. Initially, paper focuses on BDFM concept and development of it. The synchronous mode operation of BDFM will be studied, and


then by introducing the d-q coordination, the dynamic equation of BDFM will be represents. Furthermore, this paper devotes a new predictive FLDTC in d-q coordination through a short review of some definitions in Fuzzy. In this method a novel expanded rule bases by twelve stator sectors represented. This algorithm is careless to the priority of flux and torque, and it is easily implemented, and it improves the system performance through decreasing both torque and flux ripples. Finally the simulation results of classic DTC and FLDTC of BDFM are compared, presented and evaluated. Keywords - BDFM, DTC, FLC

191 Sliding Mode Control of a Feedback Linearized Induction Motor using TS Fuzzy Based

Adaptive Iterative Learning Controller

Madhu Singh, Kanungo Barada Mohanty, Senior Member, IEEE, Bidyadhar Subudhi, Senior Member, IEEE Department of Electrical Engineering, )ational Institute of Technology, Rourkela, I)DIA This paper presents an application of a Takagi Sugeno (TS) Fuzzy logic based adaptive Iterative Learning Controller (ILC) to reduce chattering, torque ripple and to improve dynamic performance of a feedback linearized induction motor drive with sliding mode controller for periodic speed tracking. This ILC is connected to the forward path of sliding mode speed control loop. At first, the state feedback linearization technique is used for decoupling speed and flux control loop. It uses reference frame transformation and control in a stationary (α-β) frame with rotor flux and stator current components as the state variables. Since the induction motor drive system is sensitive to parameter variation, model uncertainties and load disturbances, a robust control strategy based on sliding mode is designed. In the sliding mode based scheme the chattering of state and control variables and torque ripple are present. To reduce chattering and torque ripple, a TS fuzzy logic based adaptive ILC is designed. Both control schemes are simulated in SIMULINK environment. Simulation results demonstrate that the performance of sliding mode cum TS fuzzy logic based adaptive ILC is better than the scheme with only sliding mode controller. These simulation results are also verified with real time simulator, RT Lab. Keywords - Feedback linearization, Decoupling control, Sliding Mode Controller, Takagi Sugeno Fuzzy control, Adaptive Iterative Learning Control, Real Time Simulator

233 Regenerative Braking Control for Light Electric Vehicles

Cheng-Hu Chen1, Wen-Chun Chi2 and Ming-Yang Cheng2 1Department of Mechanical and Electro-Mechanical Engineering, )ational Ilan University, Ilan, Taiwan 2Department of Electrical Engineering, )ational Cheng Kung University, Tainan, Taiwan In this paper, a cost effective single stage bidirectional DC/AC converter is designed and implemented using a general full-bridge inverter without any additional power switches or bulky passive components. According to different driving conditions, three switching strategies are developed and analyzed. These switching strategies, which are named after the operating number of the power switches, are called the single-switch, two-switches and three-switches control strategies. Different performance indexes such as boost ratio, maximum voltage conversion ratio, braking torque, etc., are proposed and compared among different switching strategies. Theoretical analysis and experimental results have revealed that the cruising distance, braking torque, and reliability can be improved effectively using a variable braking control strategy according to the driving conditions. Since the additional power switches, passive components and costly position sensors are not required, the proposed method is particularly suitable for various light electric vehicles. Keywords － light electric vehicle; regenerative braking; bidirectional DC/AC converter.

361 Modelling of Battery Temperature Effect on Electrical Characteristics of Li-ion Battery in

Hybrid Electric Vehicle

Y.K. TA)1, J.C. MAO2 and K.J. TSE)G2


1Energy Research Institute @ )anyang Technological University, Singapore 2School of Electrical & Electronic Engineering, )anyang Technological University, Singapore This paper presents an enhanced modelling method for the commonly used energy storage device i.e. lithium-ion (Li-ion) battery of a hybrid electrical vehicle (HEV). In this enhanced modelling method, the thermal effect, an important part of the battery electrical model, is considered to generate a holistic understanding, hence the characteristic of the Li-ion battery. Because of the high temperature sensitivity of the battery cell/pack in HEV, it is critical to have such accurate thermal-electrical model. Compared with sole electrical model of Li-ion battery, the simulation results from MATLAB Simulink modelling show that the combination of thermal and electrical models by making use of a thermal function to model the differences made by temperature exhibit better representations of the actual characteristic of the Li-ion battery.

453 Comparative analysis of ABB and SSM controllers in a ZVCS-Full Bridge Series-Parallel

Resonant DC-DC Converter Zahra Malekjamshidi1 and Mohammad Jafari2 1Department of Electrical Engineering, Marvdasht branch, Islamic Azad University Marvdasht, Iran 2Department of Electrical Engineering, Fasa branch, Islamic Azad University Fasa, Iran In this paper, two methods of control for high-voltage Full Bridge Series-Parallel Resonant (FBSPR) DC-DC converter are proposed and the results are compared. Soft switching operation using Zero Current Switching (ZCS) and Zero Voltage Switching (ZVS) technologies is employed to decrease the losses and optimize the efficiency of converter. The way of obtaining small-signal model of FBSPR converter using the generalized averaging method is discussed. Then two control methods using Artificial Neural Networks (ANN) and Sequential State Machine (SSM) are explained and the experimental results are compared. Comparison between experimental results for both ANN and SSM controllers show better speed performances for SSM controller in small changes in load and more reliability for ANN controller in case of large variations. Keywords - Full Bridge, Series-Parallel Resonant Converter, Artificial Neural Networks, Sequential State Machine, ZVS, ZCS

414 A Bew Digital Control DC-DC Converter with Repetition Beural Betwork Prediction Fujio Kurokawa1, Kimitoshi Ueno1, Hidenori Maruta1, Hiroyuki Osuga1,2 1)agasaki University, 1-14 Bunkyo-machi, )agasaki, 852-8521, Japan 2Mitsubishi Electronic Corporation, 325 Kamimachiya, Kamakura, Kanagawa, 247-8520, Japan This paper presents a novel prediction based digital control dc-dc converter. In this method, a neural network control is adopted to improve the transient response in coordination with a conventional P-I-D control. The prediction based control term is consists of predicted data which are obtained from repetitive training of the neural network. This works to improve the transient response very effectively when the load is changed quickly. As a result, the undershoot and convergence time of the output voltage and the overshoot of the reactor current are suppressed effectively as compared with the conventional one in the step change of load resistance.

313 Sensorless Position Optimal Control Strategy of Brushless DC Motor Chii-Maw Uang1, Zu-Sheng Ho1, Ping-Chieh Wang1, Sheng-Hao Liu2 1Department of Electronic Engineering, I-Shou University, Kaohsiung, Taiwan. 2System IC Design Division, Holtek Semiconductor Inc, Hsinchu, Taiwan. Brushless DC motor is a high efficiency energy saving motor, requires Hall sensors for commutation. But Hall sensor can't operate in any high temperature or high noise place, so need change to sensorless drive. The sensorless drive technology becomes more and more mature, in which the most widely used technique is the direct BEMF detection. Direct BEMF detection usually use hardware low pass filter or software detecting


method to filter out the noise signal, but they all need to find suitable parameters for zero-drift problems which will occur in varying speed or load conditions. In this paper, analyzing unexcited phase freewheeling current technique is proposed to overcome these drawbacks. To achieve practically applicable, a simple arithmetic calculation is devised for analyzing the freewheeling current and thus complex operations are avoided. Experimental results show that the proposed method can accurately find the shifted position and the system stability is also assured. Keywords - BLDCM, Sensorless, Phase Correction.

285 Current-Mode Sensorless Control of Single-Phase Brushless DC Fan Motors Wei-Chao Chen and Ying-Yu Tzou, Member, IEEE Power Electronic Systems and Chips Lab. Department of Electrical Engineering )ational Chiao Tung Univ., Hsinchu, Taiwan This paper proposes a new control scheme for the implementation of a low-cost and high efficiency sensorless speed control IC for single-phase brushless dc (BLDC) fan motors. The proposed control scheme detects the zero-crossing-point (ZCP) of the measured back-EMF to generate commutation signals without Hall sensor. A current mode soft switching scheme is used to smooth the current spikes induced by the reduction of the back-EMF when the rotor is crossing the commutation boundary. An adaptive blanking time control strategy is used to adjust the time interval to ensure correct detection of the ZCP. An open-loop constant Ampere/Hertz ramping control scheme is developed for the startup control from zero speed and switching to sensorless mode once the ZCP is detected. The proposed sensorless control scheme has been verified by using computer simulation based on a developed single-phase BLDC fan motor model. Experimental verification of the proposed control scheme has been carried out by using digital implementation technique. Experimental results reveal the superior performance of the proposed control scheme. Keywords - single-phase brushless dc fan motor, sensorless control, adaptive blanking time control, soft commutation, soft start-up control, digital motor control IC.

491 A Bovel Offset Based PWM Method For Three Phase AC-AC Matrix Converter )guyen Van )ho, )guyen Khanh Tu Tam and Huynh Thai Hoang Faculty of Electrical & Electronics Engineering, Ho Chi Minh city University of Technology, 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City,Viet)am The paper presents a novel universal offset based PWM method for 3f ac-ac matrix converter, whose characteristics can be controlled by the offset regulation. Typical characteristics of the offset based PWM control for the matrix converter will be described. The proposed PWM algorithm may help to simplify further study of PWM techniques for ac-ac matrix converter. Different variants of the offset functions for unity input power factor will be presented. The theoretical analysis will be verified by experimental results. Keywords - ac-ac matrix converter, offset based PWM, common mode, input power factor, Discontinuous PWM.

234 Study on the Current Control Loop of PMSM Based on Sinusoidal Commutation

Tzu-Yu Liu1, Cheng-Hu Chen2, Wen-Chun Chi1 and Ming-Yang Cheng1 1Department of Electrical Engineering, )ational Cheng Kung University, Tainan, Taiwan 2Department of Mechanical and Electro-Mechanical Engineering, )ational Ilan University, Ilan, Taiwan

This paper focuses on the current control loop design of the permanent magnet synchronous motor based on sinusoidal commutation. It is well known that sinusoidal commutation can provide a smooth and fast torque response and is particularly suitable for a permanent magnet synchronous motor with sinusoidal back EMF. In general, sinusoidal commutation can be further divided into SPWM and SVPWM. In this paper, simulations of different current control loop approaches, e.g., three-phase current control and field oriented


control are performed using Matlab/simulink to obtain suitable control parameters. Moreover, this paper also develops a motor drive for a permanent magnet synchronous motor, in which both SVPWM sinusoidal commutation and field oriented control are implemented using a cost effective microcontroller. Experimental results indicate that the motor drive developed in this paper exhibits satisfactory performance. Keywords - sinusoidal commutation, current control loop, permanent magnet synchronous motor.

171 Seven-level Cascaded Inverter Based Shunt Active Power Filter in Four-wire Distribution

System

Izzeldin Idris Abdalla, K. S. Rama Rao and ). Perumal Department of Electrical and Electronic Engineering Universiti Teknologi PETRO)AS 31750 Tronoh, Malaysia This paper presents a compensating system for the harmonic currents, the reactive power and source neutral conductor current in three-phase four-wire distribution system by using seven-level cascaded H-bridge voltage source inverter (CHB-VSI) based shunt active power filter (SAPF). The distribution network which supplies mixed non-linear loads and employing multilevel inverter (MLI) based SAPF is simulated by MATLAB/SIMULINK software. The analysis on performance of SAPF using the proposed control technique based on p-q theory is carried out on the total harmonic distortion of source current, power factor and reactive power. Besides, it is illustrated by extensive simulation results, the effectiveness of CHB-VSI based SAPF on source neutral conductor current.

187 A Buck Converter Using Accurate Synthetic Ripple Hysteresis Control Scheme C.C.Chuang, H.P.Chou and M.L.Chiu Department of Engineering and System Science )ational Tsing Hua University Hsinchu, Taiwan

This paper presents a dc-dc buck converter using hysteresis current control mode for fast response. A synthetic ripple voltage is proposed to sense the voltage across the inductor and to generate a saw tooth waveform for hysteresis band control. The proposed sensing circuit acts like a low-pass filter and has a local feedback loop to reduce the switching noise. Full chip simulation results indicate that the synthetic ripple slope has accuracy about 95%. The range of the operation voltage of the proposed design is from 2.7 to 4.2V; the low noise design is particularly suitable for portable device with a Li-ion battery power supply. Keywords - Buck Converter, Hysteresis Control, Switching Noise Rejection, Current Control Mode.

70 Bew DC Rail Side Soft-Switching PWM DC-DC Converter with Current Doubler Rectifier Khairy Sayed1, Soon-Kurl Kwon2, Katsumi )ishida3 and Mutsuo )akaoka4

1Sohag University, Sohag, Egypt 2Kyungnam University, Masn, South Korea 3Ube )ational College of Technology, Ube, Japan 4Kyungnam University, South Korea/Yamaguchi University, Yamaguchi, Japan V This paper presents a new circuit topology of active edge resonant snubbers assisted half-bridge soft switching PWM inverter type dc-dc high power converter for DC bus feeding power plants. The proposed dc-dc power converter is composed of typical voltage source-fed halfbridge high frequency PWM inverter with a high frequency planar transformer link in addition to input DC busline side power semiconductor switching devices for PWM control scheme and parallel capacitive lossless snubbers. The operating principle of the new DC-DC converter treated here is described by using switching mode equivalent circuits, together with its unique features. All the active power switches in the half-bridge arms and input DC buslines can achieve ZCS turn-on and ZVS turn-off commutation transitions. The total turn-off switching losses of the power switches can be significantly reduced. As a result, a high switching frequency IGBTs can be actually selected in the frequency range of 60 kHz under principle of soft switching. The performance evaluations of the experimental setup are illustrated practically. The effectiveness of this new converter


topology is proved for low voltage and large current dc-dc power supplies as DC bus feeding from a practical point of view. Keywords- active edge resonant snubbers; DC-DC power converter; dc rail; industrial arc welding; high frequency transformer link; soft switching PWM.

410 Grid-Connection Single-Stage Photovoltaic Inverter System with Double-Linear-

Approximation MPPT Chih-Lung Shen1, Cheng-Tao Tsai2, Jye-Chau Su1, Yi Chan1 1Department of Electronic Engineering )ational Kaohsiung First University of Science and Technology )anzih, Kaohsiung, Taiwan, R.O.C. 2Department of Electrical Engineering )ational Chin-Yi University of Technology Taiping City, Taichung, Taiwan, R.O.C. In this paper, a grid-connection single-stage PV inverter system is presented, which can deal with solar energy and performs power conditioning. To draw maximum power from PV arrays, double-linear approximation (DLA) algorithm is proposed to achieve maximum-power-point tracking (MPPT) for PV arrays. The DLA is based on that the trajectories of maximum power point varying with irradiation and with temperature are approximately linear, respectively. With the DLA, the inverter system can determine maximum power point instantaneously and then, calculates current command easily. Thus, complicated calculation and perturbation about an optimal point can be avoided. In this paper a corresponding circuit to realize DLA is carried out as well, of which configuration is simple. As a result, the proposed circuit is cost-effective and can be embedded into inverter system easily. From simulated and experimental results, the proposed DLA algorithm has been verified and the feasibility of the PV inverter system is also demonstrated. Keywords - Grid-connection inverter, single-stage, PV power, maximum power point tracking.

Session Poster Session II (PS-II) Date/Time Wednesday, 07 December 2011/16:00 – 17:40 hrs Venue Ballroom 2 Chair Yung C. Liang, National University of Singapore, Singapore

71 A Digital Position Controller of Travelling Wave Ultrasonic Motors )guyen To Hieu, Shogo Odomari, Kosuke Uchida, Tomonobu Senjyu and Masato Oshiro Department of Electrical and Electronics Engineering, University of the Ryukyus I Ultrasonic motor offers great advantages for industrial applications due to its excellent intrinsic properties. However, when load torque is applied, a dead-zone occurs in the control input. Therefore, a digital controller is adopted for ultrasonic motor. The state quantities, such as acceleration, speed and position, are needed to apply the digital controller for position control. Yet, rotary encoder causes quantization errors in the speed information. To overcome these problems, this paper presents a digital position control method for ultrasonic motor. The state variables for digital controller are estimated by a Variable Structure System observer. Furthermore, a small, low cost and fast response digital controller is designed by using a micro computer that is essential in embedded system for the developments of industrial equipments. Effectiveness of the proposed method is experimentally verified.

483 Design Aspects and Test Results of a High Speed Bearingless Drive H. Mitterhofer, W. Amrhein Institute of Electrical Drives and Power Electronics Johannes Kepler University Linz, Austria shareholder of the ACCM GmbH


Following the trend towards smaller drives operating at increased speeds, the present work examines the suitability of bearingless drives for high speed operation. With rising rotational frequency, the requirements for the drive components differ significantly from a design specification for low speeds. Therefore, the design of the stator, rotor and winding system is described in detail. In order to verify the conducted analytical and FE calculations, a laboratory prototype was constructed reaching - to the knowledge of the authors - a world record speed for bearingless drives of 115.000rpm. Eventually, measurements showing specific losses and operational behavior of the drive are presented.

208 Influence of Bumber of Poles, Magnet Arrangement, and Current Density on Characteristics

of Inner and Outer Rotor PMSMs Yusuke Tani, Shigeo Morimoto, Masayuki Sanada Osaka Prefecture University, 1-1 Gakuen-cho, )aka-ku, Sakai, Osaka, Japan Permanent magnet synchronous motors (PMSMs) have been increasingly used in various applications for their small size and high efficiency. There are two major classes of PMSMs. One is the inner rotor type (IR type) PMSM, which has the rotor on the inside and the stator on the outside. The other is the outer rotor type (OR type) PMSM, which has the rotor on the outer side of the stator. In this paper, the characteristics of seven kinds of IR type and OR type motor structures are compared by changing the magnet arrangement, number of poles, and current density.

291 Bew infinitesimal method for the calculation of self and mutual inductances of arbitrary AC

windings

Radoslav Cipín, Miroslav Patočka Department of Power Electrical and Electronic Engineering, Faculty of Electrical Engineering and Communication, Brno University of Technology, Czech Republic The paper describes a new universal infinitesimal method, which enables the calculation of self and mutual inductances of arbitrary AC windings. The method is based on the notion of the local angular density of conductors n(α) = dN(α)/dα. It will be proved the proportionality B(α) ≈ ∫n(α)dαfor the magnetic flux density in the air gap. The function n(α) can be arbitrary, i.e. of continual or impulse character. Spatial functions n(α), B(α) may be evolved into Fourier series. The first harmonic components of these functions serve to the electromagnetic desin of the induction or synchronous motor. Higher harmonic components serve to the calculation of the differential leakages.

292 Identification of the induction motor parameters based on the acceleration method

Radoslav Cipín, Miroslav Patočka Department of Power Electrical and Electronic Engineering, Faculty of Electrical Engineering and Communication, Brno University of Technology, Czech Republic The paper deals with identification of the equivalent circuit parameters of the induction motor. The identification has been done by comparison of measured torque and current characteristics and computed torque and current characteristics. Equivalent circuit of the induction motor has been used in form of the Γ-circuit. There is computed the dependency of the leakage inductance and the rotor resistance on the slip. For exact identification of the motor parameters has been used the genetic algorithm.

112 Three-Phase Boost Converter with Integrated Auxiliary Step-Up Circuit for Electric Vehicle

Applications Ching-Ming Lai1, IEEE Member, Ming-Ji Yang2 and Hou-Hsuan Chen2 1Product Competence Center, Power SBG Lite-O) Technology, Taiwan, R. O. C. 2Department of Vehicle Engineering, )ational Taipei University of Technology, Taiwan, R.O.C


This paper proposes a novel three-phase interleaved high step-up converter suitable for electric vehicle applications. By integrating an auxiliary circuit, the proposed three-phase converter can achieve a higher voltage-boosting ratio than that of the conventional boost converter and possess lower duty cycle, leading to significantly reduced diode reverse recovery, voltage ratings of power devices and energy volumes of most passive components. Besides, interleaved feature of the proposed converter provides the lower input current and output voltage ripples. The operating principle and steady state analysis for the proposed converter are presented and discussed in this paper. Finally, simulation and experimental results of a laboratory prototype are provided to verify the feasibility. Keywords- Interleaved, high step-up, electric vehicle.

258 Theoretical Study on Eco-Driving Technique for an Electric Vehicle Considering Traffic

Signals Masafumi Miyatake1, Motoi Kuriyama2 and Yuzuru Takeda2 1Department of Engineering and Applied Sciences Sophia Univ Kioi-cho 7-1, Chiyoda-ku Tokyo 102-8554, Japan 2Department of Electrical and Electronics Engineering Sophia Univ Kioi-cho 7-1, Chiyoda-ku Tokyo 102-8554, Japan

Eco-driving technique for Electric Vehicle (EV) is investigated in this paper. Many works on EV were reported; however they did not deal with the eco-driving from the viewpoint of theoretical study. The authors have developed the energy-saving driving technique so-called “eco-driving” based on the dynamic programming (DP). Optimal speed profile of an EV, which minimizes the amount of total energy consumption has been decided under fixed origin and destination, running time, and road condition. DP algorithm can deal with such complicated conditions and also can derive the optimal solution. Using the proposed method, simulations were implemented in some cases. Especially the authors paid attention to the road with traffic signals and simulated it without increase of calculation time.

326 SOH Estimation of Lead Acid Battery for Automobile Kentaro Ushiyama, Masayuki Morimoto Department of Electrical and Electronic Engineering, Tokai University, 4-1-1 Kita-Kaname, Hiratsuka-shi, Kanagawa-ken, 259-1292, Japan Recently, deterioration of lead acid battery for automobile is one of the problems. Because an electrical load of the automobile increases. In this paper, on-line SOH (State Of Health) estimation is proposed. The equivalent circuit constants vary by the deterioration of the battery. The equivalent circuit constant can be calculated by using terminal voltage and current. Therefore, SOH can be estimated during operation.

416 Optimal Control of Single-Phase Voltage Source Active Rectifier with Emphasis on the

Minimal Electromagnetic Interference

Zeman M.2, Blahník V.1,2, Peroutka Z.1,2, Michalík J.1,2 Regional Innovation Centre for Electrical Engineering (RICE)1, Faculty of Electrical Engineering2, University of West Bohemia, Pilsen, Czech Republic This contribution presents comparison of two competitive control strategies for the single-phase voltage source active rectifier with emphasis on the minimal EMI. The first control is based on the PR controller with active damping of low-frequency disturbances at the converter ac side and the second control employs so-called hybrid delta modulation which naturally secures the sinusoidal waveform of the ac current. Results presented in this paper are confirmed by experiments made on developed laboratory prototype of the single-phase VSAR.


28 A Bew Wind Turbine Simulator using a Squirrel- Cage Motor for Wind Power Generation

Systems Ahmed. G. Abo-Khalil Electrical Engineering Department, Faculty of Engineering, Assiut University, Egypt. In this paper, a new wind turbine simulator using a squirrel cage induction motor for both steady state and transient conditions. The turbine static characteristics are modeled using the relation between the turbine power versus the wind speed and the blade pitch angle. The turbine performance is subjected to a real wind speed pattern by modeling the wind speed as a sum of harmonics with wide range frequencies. The turbine model includes the effect of the tower shadow and wind shear. A pitch angle controller is designed and used to protect the coupled generator by limiting the turbine output power to the rated value. High inertia blades are also simulated instead of the low actual turbine inertia. Experimental results are presented to verify the wind turbine simulator performance.

188 A Simple Rule-Based Approach for Detection and Classification of Voltage Sag, Swell, and

Interruption in Power Systems

Cheng-I Chen, Member, IEEE, Hung-Lu Wang, and Yuan-Chieh Chin, )on-Member For the development of smart grid, the effective detection of power quality events is a very important task for the power system monitoring. Voltage sags, interruptions, and voltage swells which usually produce large losses in commercial and industrial consumers are the main events in power systems due to the sensitivity of equipments to these voltage variations. In this paper, a simple rule-based detection method for voltage events by applying the filter bank and adaptive filter is presented. The usefulness of the proposed algorithm is demonstrated by a simple laboratory setup with LabVIEW program and actual recorded waveforms. With the help of accurate detection time of the filter bank and correct event classification of adaptive filter, power system monitoring could provide accurate and useful information to power grids via the developing advanced metering infrastructure. Keywords - voltage event, filter bank, adaptive filter, rule-based approach.

379 Performance Evaluation of a Low Power Solar-PV Energy System with SEPIC Converter )eha Adhikari1, Bhim Singh2, Fellow IEEE, A. L. Vyas1 1Instrument Design Development Centre, Indian Institute of Technology Delhi, Hauz Khas, )ew Delhi-110016, India 2Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas, )ew Delhi-110016, India This paper presents the design and performance of a low power stand-alone solar photovoltaic (PV) energy generating system. The system is designed considering solar-PV panels of 750W to feed an average load demand of 250W for a rural household. The system includes series-parallel combination of solar panels, MPPT (maximum power point tracking) controller, a dc-dc converter, an energy storage system and a single-phase VSI (voltage source inverter). A dc-dc converter is providing a constant dc bus voltage and its duty cycle is controlled by the MPPT controller. A modified incremental conductance approach is utilized for MPPT. In this approach, MPPT controller automatically generates a PWM signal for the dc-dc converter to extract maximum power. To maintain the power quality a feedback control is used in the VSI. The complete system is designed, and modeled to evaluate its performance. Simulated results are presented to demonstrate the performance of the MPPT controller and designed system for varying atmosphere conditions and load disturbances. Keywords - Solar-PV energy, Isolated SEPIC converter, Closed loop control, Incremental conductance approach, MPPT controller.

364 An Intelligent Current Limiter and Zero Active Power Injection Algorithm for Microgrid

Voltage Support


C.). Rowe1,2, T.J. Summers1, R.E. Betz1 and D.J. Cornforth2 1School of Electrical Engineering and Computer Science University of )ewcastle, Australia, 2308 2CSIRO Energy Centre Steel River, )ewcastle, )SW This paper presents an ancillary control scheme to be used by a generic Distributed Generator (DG) for voltage support. It consists of an intelligent current limiter coupled with a Zero Active Power Injection (ZAPI) algorithm. The ZAPI algorithm can ensure voltage support without effecting the nominal real power output of the distributed generator. The intelligent current limiter ensures that the current demanded by the voltage support scheme does not effect the angle or magnitude of currents associated with DG real power injection. The control scheme is able to be utilised by parallel inverters as it is based on open loop current control and direct power flow solutions. SABERr simulations are provided to show the operation of the control scheme for an individual inverter and two parallel inverters whilst grid connected. Keywords - Distributed Generation, Microgrids.

238 Analysis and Comparison Study of PWM and Phase-Shifted PWM Full-Bridge Inverter Fed

High-Voltage High-Frequency Ozone Generator Prasopchok Hothongkham1, Somkiat Kongkachat2 and )arongchai Thodsaporn1 1Department of Electrical Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin 96 Mu 3 Phutthamonthon Sai5 Salaya, Phutthamonthon, )akhon Pathom 73170 2Department of Electrical Engineering, Faculty of Engineering, Thonburi University 29 Soi Phetkasem 110 )ongkangphlu, )ongkaem, Bangkok, THAILA)D

This paper presents the analysis and the comparison study of a High-voltage High-frequency Ozone Generator using PWM and Phase-Shifted PWM full-bridge inverter as a power supply. The circuits operations of the inverters are fully described. In order to ensure that zero voltage switching (ZVS) mode always operated over a certain range of a frequency variation, a series-compensated resonant inductor is included. The comparison study are ozone quantity and output voltage that supplied by the PWM and Phase-Shifted PWM full-bridge inverter. The ozone generator fed by Phase-Shifted PWM full-bridge inverter, is capability of varying ozone gas production quantity by varying the frequency and phase shift angle of the converter whilst the applied voltage to the electrode is kept constant. However, the ozone generator fed by PWM full-bridge inverter, is capability of varying ozone gas production quantity by varying the frequency of the converter whilst the applied voltage to the electrode is decreased. As a consequence, the absolute ozone quantity affected by the frequency is possibly achieved.

135 An Evaluation Method of Transformer Behaviors on Common-mode Conduction Boise in

SMPS

Qingbin Chen1, Wei Chen1, Qingliang Song2, Yongfa, Zhu2 1Fuzhou University, Fuzhou, Fujian, 350108, China 2Huawei Technology Co., Ltd., China

The electric coupling between primary and secondary windings of the transformer is usually evaluated by the capacitance between the primary and secondary windings which is tested by one-port test devices, such as LCR meter. This method can’t completely characterizes the EMI behaviors of the transformer on common-mode noise, because this method does not account electrical potential distribution along the winding turns and the shielding copper foil effect in the transformer. A new evaluation method is proposed in this paper which can overcome the traditional shortages on CM noise by spectrum analyzer, EMI receiver or network analyzer. The method provides an effective test tool to optimize the structures of the windings and shielding of a transformer in design and to control the quality of the transformer in mass production with its CM EMI behaviors. Finally, the experimental results verify the proposed method to be correct and feasible.

363 Small Signal Stability Analysis of Arctan Power Frequency Droop C.). Rowe1,2, T.J. Summers1, R.E. Betz1 and D.J. Cornforth2 1School of Electrical Engineering and Computer Science University of )ewcastle, Australia, 2308


2CSIRO Energy Centre Steel River, )ewcastle, )SW The microgrid is an environment constructed with the aim of controlling local distributed resources. The most common power flow control technique utilised in a standalone microgrid is- a technique known as power frequency droop. An arctan droop controller was previously presented in [1]. This paper analyses the stability of this arctan power frequency droop. SABER simulations are performed to obtain the operating points about which the system is linearised. Considering a resistive coupling the arctan droop can delay the onset of oscillatory modes. Given an inductive coupling under high output power the arctan gradient is able to maintain larger stability margins in the microgrid, for the discrete operating points analysed. Limited hardware results are provided to confirm the operating points are achievable. Keywords - Distributed Generation, Microgrids, Power Electronics, Power Frequency Droop.

104 Thermal Units Commitment Considering Voltage Constraint Based on Controllable Loads

Reactive Control in Smart Grid Tomonori Goya1, Tomonobu Senjyu1, Atsushi Yona1, )aomitsu Urasaki1, Toshihisa Funabashi 2 and Chul-Hwan Kim3 1The Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan. 2Meidensha Corporation, Tokyo 141-8565, Japan. 3The School of Electrical and Computer Engineering, Sungkyunkwan University, Suwon City 440-746, Korea, and )PT Center, Recently, the deregulation and liberalization in power market increase the competition in retail and power sector. Therefore power companies need to reduce operational cost and maximizes the profit by operating generator with higher efficiency. On the other hand, the electrized residences are increasing. So the controllable loads such as electric water heater, heat pump and electric vehicles are introduced to power systems. However conventional system does not operate the thermal units and controllable loads in a coordinated manner. Therefore, the smart-grid has become very popular in worldwide. This paper focuses on the reactive power schedule of the controllable loads, and determines the optimal operation of the thermal units satisfied the voltage constraint. Simulation results show the validation of the proposed method and validate the performance and effectiveness of the algorithm for controllable loads and batteries. Keywords - smart grid, tabu search, controllable load, thermal unit commitment, voltage constraint, renewable energy plant.

110 Energy Storage Systems for Seamless Mode Transfer in Microgrid

Che-Wei Chang and Yung-Ruei Chang Institute of )uclear Energy Research (I)ER), Taoyuan, Taiwan In this paper, functions of energy storage systems (ESS) for seamless mode transfer are mentioned. ESS is becoming the master component in microgrid when operating in standalone mode, which should control the voltage and frequency on the microgrid and overcome the transience when mode transfers. In addition, ESS should absorb the remaining DG generation power to charge batteries. In Taiwan, there is a project of microgrid demonstration planned to build a 300 kVA pilot plant with 20% penetration rate. The simulation results of mode transfer are shown.

203 Multi-switch Driving Circuit with LLC Resonant Circuit for High Pulsed-Voltage Generator

S.–Y. Tseng1, S.–T. Peng1, Y.–J. Chuang1 and C.–T. Tsai2 1GreenPower Evolution Applied Research Lab (G-PEARL) Department of Electrical Engineering Chang Gung University Kwei-Shan, Tao-Yuan, Taiwan, R.O.C 2Department of Electrical Engineering )ational Chin-Yi University of Technology Taiping, Taichung , Taiwan , R.O.C.


This paper proposes a multi-switch driving circuit with LLC resonant circuit for high pulsed-voltage generator. The proposed circuit structure adopts full-bridge inverter associated with LLC resonant circuit and pulse transformers to generator ac pulse voltage at high frequency. The ac pulse voltage is rectified through a rectifier circuit to form a low frequency pulse voltage which drives a series multi-switch module. In the proposed circuit structure, full-bridge inverter with LLC resonant circuit is operated in second area, where switches and output rectified diodes of inverter can separately be operated with zero-voltage switching at turn on and with zero-current switching at turn off, for reducing switching losses and increasing conversion efficiency, and reduce rising and falling times in switch to increase operational reliability. As compared with conventional full-bridge inverter with hard-switching circuit, the proposed inverter can reduce voltage and current stresses of switches and increase conversion efficiency with soft-switching features. Finally, a prototype for driving thirteen IGBTs connected with series has implemented to verify the feasibility of the proposed multi-switch driving circuit. Keywords - high pulsed-voltage generator, LLC resonant circuit, pulse transformer

199 Design and Implementation of a DSP-Based Fast Charger for Li-ion Battery

Sheng-Yuan Ou, Member, IEEE, Jen-Hung Tian and Chung-Yen Yang Department of Electrical Engineering )ational Taipei University of Technology, Taiwan

This paper provides a fully-digital controlled fast charger for Li-ion battery. The dc/dc buck converter is used as the charger circuit and a DSP TMS320F2812 by Texas Instruments is adopted to control the designed current and voltage loops. By digital controller design, the fast charging method is achieved, including the charging pattern comprised of CC mode and CV mode. The specifications are the input voltage is 9V, the output constant current is 1A, and the output voltage is from 3V to 5V. The Li-ion battery is used as the secondary battery because of the advantages including high energy density, high operation voltage and no memory effect. The Motorola charging method is utilized to implement the fast charging functionality in which a charging period includes a charging time, a rest time and a discharging time. The rest time and the discharging time can speed up the chemical reaction to increase the endurable charging current and shorten the charging time. The charging time is within 40mins in experiments, the change in charging temperature increase is within 1.1oC, and the charging efficiency is up to 87.51%. Experimental results confirm the accuracy of the design and the implementation.

254 A new DC/AC boost transformerless converter in application of photovoltaic power generation Mo Wei1, Loh Poh Chiang Andrew1 and Frede Blaabjerg2 1)anyang Technological University, School of Electrical and Electronic Engineering, Power Division, Singapore 2Aalborg University, Department 14, Institute of Energy Technology, Denmark This paper presents a new DC/AC boost transformerless converter in the applications of photovoltaic (PV) power generation. A new circuit topology of single phase full bridge power inverter with additional DC/DC boost stage is proposed. The proposed topology overcomes two commonly existing shortcomings of transformerless PV system: namely one, the voltage generated sometimes low and insufficient to fulfill the load requirement; and two, there always leakage current flowing through parasitic capacitance between PV panel and ground. This configuration helps to boost the voltage at the PV side, and then converts the DC into AC to supply the load. A special modulation technique is proposed to eliminate the leakage current which is commonly presents in PV transformerless power generation, helps to increase the system efficiency and output performance.

482 Coordinated Control of Multi-terminal DC Systems for Large-scale Wind Power Transmission Wenbo Sun, Yi Wang, Xiaorong Zhu, and Xinchun Shi School of Electrical and Electronic Engineering, )orth China Electric Power University, China The multi-terminal DC (MTDC) is anticipated as an attractive solution to the large scale wind power transmission bottleneck. This paper investigates the use of voltage source converter (VSC) based MTDC


system for outward transmission of the large scale wind power. A MTDC system for aggregating and dispatching large scale wind power is proposed at first. Based on the analysis of the VSC model and control, the coordinated control strategy for the proposed MTDC system is discussed. A four-terminal MTDC system connecting two DFIG-based wind farms, the local and remote grids is simulated for demonstrating the performance and stability of the MTDC system during wind speed variations and DC line faults. The proposed MTDC system and control strategy can reallocate the wind power in the DC network to achieve a constant power for long distant transmission to the load center. Keywords - High voltage dc transmission (HVDC), voltage source converter (VSC), multi-terminal DC (MTDC), wind power transmission.

332 Design of Plasma Power for an Atmospheric Pressure Dielectric Barrier Discharge Ji-Yung Lee1, Shyh-Jier Huang1, Senior Member, IEEE and Fu-Sheng Pai2, Member, IEEE 1)ational Cheng Kung University Department of Electrical Engineering Tainan City, Taiwan 2)ational University of Tainan Department of Electrical Engineering Tainan City, Taiwan This paper is devoted to the inverter design of power supply for cold plasma loads. Based on the half-bridge inverter, the proposed circuit design has included the hybrid resonant inverter as well as soft-switching techniques such that the operation performance of the system can be significantly improved, while the volume of heat dissipation can be largely decreased. Moreover, through the software simulations and experimental measurement, relationships between input and output voltage are analyzed and validated. It was confirmed that test results gained from simulations and experiments will support the academic and practical value of the proposed hybrid resonant inverter circuits for the application considered. Keywords - Cold plasma, Plasma Power, Resonant Inverter

384 Digital Time-multiplexing Control of Single-switch Dual-Output DC/DC converter

Ting Sun and Dylan Dah-Chuan Lu Power Engineering Laboratory School of Electrical and Information Engineering University of Sydney, )SW, Australia A single-switch dual-output buck DC/DC converter with digital time-multiplexing control (TMC) technique is presented in this paper. Adaptive weighted voltage control (WVC) is introduced over the existing fixed WVC for power conversion and it is capable of flexibly and dynamically distributing output voltage errors. The digital TMC is implemented by a low cost micro-controller. Simulation and experimental results are reported to show the effectiveness of the proposed approach. Keywords - DC/DC converter; single-switch; digital time-multiplexing control;.

274 The effect of Space Vector Modulation on Capacitor Voltage Ripple in a Cascaded H-bridge

StatCom C.D. Townsend1, J. Vodden2, A.J. Watson2, T.J. Summers1, R.E. Betz1, J.C. Clare2 1School of Electrical Engineering and Computer Science University of )ewcastle, Australia 2School of Electrical and Electronic Engineering University of )ottingham, UK

Employing space vector modulation in a multi-level H-bridge StatCom (H-StatCom) can provide an excellent trade-off between harmonic performance and switching frequency. However the nature of the techniques used to balance the capacitor voltages in this modulation strategy can increase capacitor voltage ripple. This paper compares the key performance indicators in differing space vector modulation techniques including capacitor voltage ripple, total harmonic distortion and switching losses. It is shown that while one of these techniques signifi-cantly improves the trade-off between harmonic performance and switching loss it can also significantly reduce the capacitor lifetime due to the form of the resultant ripple currents.


309 Real-Time Load Compensation by Using a Cascaded Multilevel Inverter-Based STATCOM

Wei-)eng Chang, Member IEEE and Ching-Huan Liao Department of Electrical Engineering, Chang Gung University A delta-connected static synchronous compensator (STATCOM) is proposed for real-time load compensation of unbalanced load. The structure of the STATCOM is a multilevel cascaded full H-bridge inverter which is suitable for high-voltage, high-power applications. First, use of the symmetrical components method derives the control algorithm of the STATCOM. The STATCOM is then built in the Matlab/Simulink environment. Finally, simulation results indicate that the proposed delta-connected STATCOM is effective for real-time load compensation of unbalanced loads. Keywords - Delta connected STATCOM, Full h-bridge, Load compensation, Symmetrical components method.

396 Transient Stability Enhancement Evaluation of Cogeneration System by Using FACTS

Elements

Wei-)eng Chang, Member IEEE and Chia-Han Hsu Department of Electrical Engineering, Chang Gung University 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan, Taiwan, ROC This paper focuses on the transient stability analysis and enhancement evaluation of an actual cogeneration plant. The cogeneration system is constructed in the ElectroMagnetic Transient Program (EMTP) environment for analyses. Simulation results show that the needed CCT curves for successful grid-disconnection operation are much lower than calculated CCT curves without executing grid-disconnection operation. Therefore, three schemes including installations of power factor correction capacitor, static var compensator (SVC) and static synchronous compensator (STATCOM) for enhancement of grid-disconnection operation are studied, respectively. Simulation results are given and discussed. Keywords - Critical clearing time (CCT), Cogeneration plant, EMTP, Grid-disconnection, STATCOM, SVC, Transient stability.

174 Intelligent Management of Distributed Storage Elements in a Smart Grid

T. Logenthiran and Dipti Srinivasan Department of Electrical and Computer Engineering )ational University of Singapore Singapore

Ability to accommodate all types of distributed storage options and renewable energy sources is one of main characteristics of smart grid. Smart grid integrates advanced sensing technologies, control methodologies and communication technologies into current power distribution systems to provide electricity to customers in a better way. Infrastructure for implementation and utilization of renewable energy sources requires distributed storage systems with high power density and high energy density. Currently, some research investigates energy management and dynamic control of distributed storage system to offer not only high power density and high energy density storage but also high efficiency and long life systems. In this paper, an intelligent energy management system is proposed to provide short-term requirements of distributed storage system in smart grid. The energy management of a distributed storage system is formulated as a nonlinear mixed-integer optimization problem. A hybrid algorithm that is combined an evolutionary algorithm with a linear programming was developed to solve the problem. Outcomes of simulation studies show the potential of solving the problem by the proposed algorithm. Keywords - Distributed storage system, Smart grid, Short-term storage management, Evolutionary algorithm, Linear programming.


125 A Bovel Single Stage Step Up/Down AC/DC Converter for Small BLDC Wind Power

Generators Ching-Tsai Pan1, Ting-Yu Chang2, Emily Fang3 1Department of Electrical Engineering, )ational Tsing-Hua University, Hsin-Chu, Taiwan, R. O. C. 2Department of Electronic Engineering, Ta-Hwa Institute of Technology, Hsin-Chu, Taiwan, R. O. C. 3Department of Digital Technology Design, Asia-Pacific Institute of Creativity, Miao-Li, Taiwan, R. O. C. In this paper, a novel single stage step up/down AC/DC converter is proposed for small wind power BLDC generators. Basically, the proposed converter is derived by integrating a brushless DC generator (BLDCG), a full diode bridge, and a C’uk DC to DC converter to achieve same robustness as a traditional diode rectifier but without incurring large torque ripple trouble. Also, it can not only generate continuous output current but also can step up/down the generator terminal voltage to cope with the wind speed variation flexibly for achieving larger operation range of the system. Moreover, a unique scalar dynamic model of the BLDCG is proposed for simplifying the dynamic control of the system. Finally, some simulation results are given for demonstrating the feasibility of the proposed converter. Keywords - small scale wind power generation system; brushless DC generator; AC/DC converter.

323 Design of FRT Capability and Distributed Voltage Control of PV Generation System

Hayato Yamauchi, Atsushi Yona and Tomonobu Senjyu The Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan. It is issue that reduction of carbon-dioxide emissions to prevent global warming. The PV(photovoltaic) system technologies are rapidly expanding and have increasing roles in electric power technology and regarded as the green energy. But, the increasing of PV system results in the fluctuating power from changing amount of solar insolation and temperature of solar cell. Moreover, partial shadowing has been identified as a main cause for reducing energy yield of grid-connected PV systems. It is necesary to consider MPPT(Maximum Power Point Tracking) to achive highly efficient operation. This paper also adopts MPPT control to consider partial shadow. In grid connection, domestic PV system is interconnected with single phase AC. When momentary terminal voltage drop, the central control is inability to cope. Those coping techniques is control terminal voltage by reactive power control in distributed system. And, the increasing number of PV will lead to increased rate PV output of total power supply, resulting in an imbalance of demand by PV system simultaneously parallel off when momentary terminal voltage drop. Therefore, in this paper presents FRT (Fault Ride-Through) function of domestic PV system that block unwanted parallel off and continued operation in a few minutes. Effectiveness of the proposed method is verified by simulation results in Matlab/simPower System R® environment. Keywords - PV system, MPPT control, reactive power control, DC link voltage control, grid voltage control, FRT capability

408 Improved Performance of a Bovel SMC-Fuzzy Controller for DTC Brushless DC Motor Drive

for Precise Speed Regulation

C. Subba Rami Reddy1 and M. Surya Kalavathi2 1Electrical & Electronics Engineering department, K.S.R.M College of Engineering, Kadapa, India. J 2Electrical & Electronics Engineering department, J.).T.U.H College of Engineering, Hyderabad, India. The direct torque control (DTC) mechanism is the well popularly used technique as the control strategy for motor drive system. This paper presents a novel sliding mode control Fuzzy speed controller for the direct torque controlled (DTC) Permanent magnet brushless DC (PMBLDC) motor for instantaneous torque control, reduced torque ripple and precise speed control under parameter variations and dynamic load disturbances . The proposed controller employs only the signal of speed error, avoiding the sensitivity to the noise of the acceleration signal as in the conventional sliding mode controller (SMC). It is composed of an equivalent control term, a switching term and a fuzzy control term. The sliding mode controller that is made


up of the former two terms ensures the system's stability. The SMC's chattering phenomenon is eliminated by varying its control continuously according to the distance of the system states from the sliding surface. The fuzzy control term improves dynamic response and reduces the steady-state error in the boundary layer. Equation based Matlab/Simulink simulation results for no-load operation, load perturbation and step change in reference speed show the proposed controller has the advantages of fast response and less steady-state error when compared to that of the conventional SMC controller with a boundary layer. Keywords - permanent magnet brushless DC motor; sliding mode controller; fuzzy controller; direct torque control; speed controller

343 The Optimization of Control Parameters of PSO based MPPT for Photovoltaics

Takayoshi Kamejima1, Vanxay Phimmasone1, Yuta Kondo1, Masafumi Miyatake2 1Graduate School of Electrical and Electronics Engineering, Sophia University, Japan 2Department of Engineering and Applied Science, Sophia University,Japan An effective PSO (Particle Swarm Optimization) of MPPT (Maximum Power Point Tracking) control method for photovoltaic(PV) power generation system was proposed in the past paper. In this paper, the authors propose the parameter tuning method of the controller based on an adjusting rule in order to extract power as large as possible under various insolation conditions with partial shading. In the result, PSO control makes PV output power increased.

347 The Implementation of Direct Virtual Torque Control and Direct Power Control for DFIG in

Wind Energy System Using DSpace 1103 Phan Quoc Dzung1, Anh )guyen Bao1, Phuong Le Minh1, Khoa Le Dinh1 and Hong Hee Lee2 1Faculty of Electrical & Electronic Engineering, HCMC University of Technology, Ho Chi Minh City, Vietnam 2School of Electrical Engineering, University of Ulsan, Ulsan, Korea This paper proposed an experimental approach to DVTC and DPC control algorithms for Wind-Turbine System - DFIG using the DSpace software 1103 in conjunction with Matlab/Simulink. The algorithms for controlling rotor-side converter (RSC) of a doubly-fed induction generator (DFIG) system include direct power control (DPC) strategy for controlling power flow and direct virtual torque control (DVTC) strategy for synchronizing DFIG with grid. There is no proportional-integral (PI) regulator in both of strategies. The essence of two strategies is selection appropriate voltage vectors on the rotor-side converter. The experimental results on a 1.5-kW machine are shown to validate this approach.

255 Scaling Factor Design Issues in Variable Step Size Incremental Resistance MPPT in PV

systems

Emad M. Ahmed, Masahito Shoyama Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka, Japan

Conventional maximum power point tracker (MPPT) uses fixed step size perturbation in order to track the maximum power point (MPP), therefore the tracking efficiency has decreased due to steady state oscillations around the MPP. Recently, many techniques have been developed proposing new approaches in the field of variable step size MPPT to overcome the shortcoming of the fixed step size techniques. These approaches update the controlling parameters adaptively using a convenient scaling factor (N) to pick the MPP. However most of them need some prior analysis in order to design the appropriate value of N, which control the hall performance of the variable step size tracker. In this paper, a new approach has proposed to design N. this approach has been develop based on the overall small signal model of the PV system around the MPP. Therefore using linear control techniques the bounded value of the scaling factor has been calculated. The validity and the feasibility of the proposed analysis have been verified using MATLAB SIMULINK toolbox, and also experimental using digital signal processor (DSP).


Keywords - Maximum power point tracking (MPPT), incremental resistance (INR), scaling factor, Fixed step size, small signal stability, variable step size.

356 A Bovel MPPT Control Method of Thermoelectric Power Generation Using State Space

Averaging Method Hiroaki Yamada1, Koji Kimura1, Tsuyoshi Hanamoto1, Toshihiko Ishiyama2, Tadashi Sakaguchi2 and Tsuyoshi Takahashi2 1Graduate School of Life Science and System Engineering, Kyushu Institute of Technology 2-4, Hibikino, Wakamatsu, Kitakyushu, Fukuoka, Japan 2Kushiro )ational College of Technology 16-1, Otanoshike, Kushiro, Hokkaido, Japan This paper proposes a novel Maximum Power Point Tracking (MPPT) control method of thermoelectric power generation.This paper reveals the characteristics and the internal resistance of thermoelectric power module (TM). Analyzing the thermoelectric power generation system with boost chopper by state space averaging method, the output voltage and current of TM are estimated by with only single current sensor. The proposed method can seek without calculating the output power of TM in this proposed method, The basic principle of the proposed MPPT control method is discussed, and then confirned by digital computer simulation using PSIM. Simulation results demonstrate that the output voltage can track the maximum power point voltage by the proposed MPPT control method. The generated power of the TM is about 0.13W when the temperature difference is 40°C. This is well accorded with the V-P characteristics of the thermoelectric power module.

370 Control of PMSG-Based Wind Turbines to Damp the Power System Oscillations Xiangyu Zhang, Yi Wang, Heming Li School of Electrical and Electronic Engineering, )orth China Electric Power University, Baoding, Hebei Province, China This paper investigates the control scheme of the permanent magnet synchronous generator (PMSG)-based wind turbines to improve the power system damping. Based on the analysis of the operation characteristics and control scheme of the PMSG-based wind turbines, the relationship between the dc side voltage fluctuation of the full scale power converter and the active power regulation of the PMSG is discussed, and a novel control strategy based on the energy transmission is proposed, which ensures the wind turbine provide the power support quickly and smoothly, and then the system damping is also improved using the novel active and the reactive power additional control scheme of the PMSG-based wind turbines, respectively. Finally, a three-machine system with 30% wind power penetration was used to validate the proposed control strategy. The simulation results show that the PMSG-based wind turbines not only have the fault ride through ability but also have the fast respond ability to damp the power system oscillations using the presented control strategies, so that the damping characteristic of the power system is improved.

373 Optimal Operation Planning of Wind Farm Using Wind Power Forecasted Data

Kazuki Ogimi, Kosuke Uchida, Atsushi Yona, and Tomonobu Senjyu University of the Ryukyus, 1 Senbaru )ishihara-cho )akagami Okinawa 903-0213, Japan In order to solve problems of global warming and depletion of energy resource, renewable energy systems such as wind generation is getting attention. This paper describes an optimal operation method to introduce the wind power forecasted data of the wind turbine generators (WTG). Moreover, the wind power forecasted data is cons idered its forecast error. The optimization purpose is to smooth the output power uctuation of the wind farm (WF) and to obtain more benefit for electrical power selling. In the optimization of operation planning of WF, tabu search is used as the optimization method.

375 Control of MTDC-based Microgrid with Wind Turbines

Lirong Zhang, Heming Li, Yi Wang


School of Electrical and Electronic Engineering, )orth China Electric Power University, China A DC microgrid using multi-terminal DC system (MTDC) is an effective solution to integrate wind turbines with distribution network, due to the lower investment and the flexible system power flow distribution. A four-terminal DC microgrid composed of permanent magnet synchronous wind generators, power distribution grid, energy storage battery, and passive loads is used to validate the reasonability of the system configuration firstly. And then a power management scheme based on the above configuration is proposed to keep the power balance and stable operation. In addition, based on the analysis of the voltage source converter (VSC) model, the control strategies of constant DC voltage for coordinating various side converters are studied. Finally, simulation results show that the MTDC-based microgrid power balance is maintained automatically in grid integration and islanding modes under different conditions such as variations of wind speed and loads. The effectiveness and feasibility of the control strategies for the proposed four-terminal DC microgrid with turbines are verified.

349 The Bew Combined Maximum Power Point Tracking Algorithm Using Fractional Estimation

in Photovoltaic Systems

Dzung Phan Quoc1, Quang )guyen )hat1, Phuong Le Minh1, Khoa Le Dinh1, Vu )guyen Truong Dan1, Anh )guyen Bao1 and Hong Hee Lee2 1Faculty of Electrical & Electronic Engineering, HCMC University of Technology, Ho Chi Minh City, Vietnam 2School of Electrical Engineering, University of Ulsan, Ulsan, Korea This paper presents an improved algorithm of quick and accurate Maximum Power Point Tracking (MPPT) algorithm which is based on Incremental conductance algorithm, Fractional Open Circuit Voltage and Short Circuit Current. The proposed algorithm estimates the short circuit current or open circuit voltage, following by using Fractional Short Circuit Current or Fractional Open Circuit Voltage algorithm to quickly determine point close to MPP. MPP will be accurately determined due to Incremental conductance algorithm. The proposed algorithm can identify quickly and correctly MPP when the environmental temperature and solar radiation change. The results of proposed algorithm are made by simulating with MATLAB/Simulink program and experimenting with kit DSpace DS 1104. Keyword - Maximum power point tracking (MPPT), Incremental Conductance (Inc-cond), Fractional Open Circuit Voltage, Fractional Short Circuit Current, Matlab/Simulink, DSpace DS1104.

144 High Conversion Ratio Converter with ZVS Snubber Circuit for PV Charger Application Yuang-Shung Lee, Sian-Siou Huang, Wei-Yi Yang Department of Electrical Engineering, Fu Jen Catholic University, )ew Taipei City, Taiwan A high conversion ratio DC/DC converter with an active zero-voltage switching (ZVS) snubber circuit incorporated with maximum power point tracking (MPPT) techniques is presented in the paper. The MPPT controllers employ photovoltaic (PV) systems to make the converter output track the maximum PV output power. The active snubber circuit restricts the voltage stresses on the power switches. The simulation and experimental results verify high conversion ratio converter performance. The tracking performance simulations of the perturbation and observation (P&O) and incremental conductance (INC) MPTT are compared in the PV charging system. The tracking performances by INC MPPT controller and waveform of the PV charging system are presented.

Session Power Integrated Circuits I (PIC-I) Date/Time Thursday, 08 December 2011/09:00 – 10:40 hrs Venue Ballroom 1 Chair K. I. Hwu, National Taipei University of Technology, Taiwan


99 High-Voltage Boost Converter

K. I. Hwu and W. C. Tu Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan In this paper, a high-voltage boost converter is presented, whose operating principle is based on charge pumps and series boost converters. Furthermore, although three switches are used, no isolated gate driver is needed instead of one half-bridge gate driver and one low-side gate driver. Accordingly, the proposed converter is easy in analysis and simple in implementation. In addition, some experimental results are provided to verify the effectiveness of the proposed converter. Keywords - High-voltage boost converter, charge pump, boost converter.

101 Begative-Output Resonant Voltage Divider K. I. Hwu1, Y. T. Yau1 and Jenn-Jong Shieh2 1Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan 2Department of Electrical Engineering Ta Hwa Institute of Technology, Taiwan In this paper, a negative resonant voltage divider (NRVD) is presented with the fixed switching frequency all over the load range. The proposed resonant voltage divider without any control loop embedded can achieve good efficiency from the light load to the rated load, especially for the light load. The detailed description of the NRVD is provided along with some experimental results to demonstrate its effectiveness. Keywords- Negative output, resonant voltage divider.

100 Dual-Output Boost Converter K. I. Hwu1, Y. T. Yau1 and Jenn-Jong Shieh2 1Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan 2Department of Electrical Engineering Ta Hwa Institute of Technology, Taiwan In this paper, a dual-output boost converter with positive and negative output voltages under a single positive voltage source fed. Due to its dual output with positive and negative output voltages, this converter is very suitable for driving the half-bridge class-D amplifier, so as to remove a DC blocking capacitor required in the half-bridge class-D amplifier. Firstly, the basic operating principles of this converter are illustrated along with a simple mathematical deduction, and eventually some experimental results are provided to demonstrate its effectiveness. Keywords - Dual-output boost converter, positive and negative output voltages.

260 Integrated Ambient Light Sensor on a LED Driver Chip Jian-Fu Wu1, Chia-Ling Wei2, Yuan-Ta Hsieh3, Chiao-Li Fang3, ann-Huei Tsai3 and Ying-Zong Juang3 1Dept. of Electrical Engineering )ational Cheng Kung University Tainan, Taiwan 2Dept. of Electrical Engineering/Advanced Optoelectronic Technology Center/Green Energy Electronics Research Center )ational Cheng-Kung University, Tainan, Taiwan 3)ational Chip Implementation Center Hsinchu, Taiwan

This paper presents a boost-type light-emitting-diode (LED) driver with an on-chip ambient light dimming for the liquid crystal display (LCD) backlight module in portable electronics. The proposed system integrates an ambient light sensor (ALS) to achieve the function of dimming control. By sensing the surrounding illumination, the LED driver automatically regulates the LED current, and, hence, the power dissipation of LED backlight module can be effectively reduced. As a result, the battery life can be extended.

237 A Carrier-Based PWM Strategy for Three-Level Beutral-Point-Clamped Voltage Source

Inverters


W. Srirattanawichaikul1, Y. Kumsuwan1, S. Premrudeepreechacharn1, B. Wu2 1Department of Electrical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, 50200 Thailand watcharin. 2Department of Electrical and Computer Engineering, Ryerson University, Toronto, M5B 2K3 Canada This paper present a modified modulation strategy based on a triangular carrier wave for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). The switch states of each leg are determined by comparison between the modulation signals and a triangular carrier wave, which is used only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. The feasibility of the proposed modulation technique is verified by simulation and experimental results. These results show that a proposed carrier-based PWM technique can be easily implemented are provided to verify the proposed modulation strategy. Keywords - Carrier-based PWM, three-level neutral-point-clamped voltage source inverter, multilevel converter.

Session Motion Drives and Motion Control V (MDMC-V) Date/Time Thursday, 08 December 2011/09:00 – 10:40 hrs Venue Connection Room 1 Chair D. Mahinda Vilathgamuwa, Nanyang Technological University, Singapore

390 Direct Torque Control of Induction Motor Drives for Optimum Stator Flux and Torque

Ripple S. Srinivasa Rao, Member, IEEE and T. Vinay Kumar, Student Member, IEEE )ational Institute of Technology, Warangal, A.P., I)DIA This paper presents an effective switching state algorithm for flux and torque ripple minimization in direct torque control (DTC) of three phase induction motor drives. Proposed switching state algorithm gives an optimum flux and torque ripple at steady state condition and fast dynamic torque response. This control strategy is applied to three-level configuration using cascaded two two-level inverters. Simulation results for proposed DTC and conventional DTC techniques are presented and compared. It is observed that the flux and torque ripple are less with proposed DTC and also there is an improvement in the steady state performance.

415 Fault Tolerant Control Method to Improve the Torque and Speed Response in PMSM Drive

with Winding Faults

Chandana Jayampathi Gajanayake, Member IEEE, Bicky Bhangu, Member IEEE, Sivakumar )adarajan, and Gamini Jayasinghe, Student Member IEEE Advanced Technology Centre, Rolls-Royce Singapore Pte. Ltd. 50 )anyang Avenue, )2-B3C-08, Singapore, 639798 Fault tolerant operation of motor drives is inevitable in many safety critical applications as failures could lead to complete shutdown or degrade the performance of the whole system. Therefore, it has become important to have fault tolerant capability to support continuous operation. This paper focus on the control of a star connected fault tolerant permanent magnet synchronous motor (PMSM) drive which suffers from open winding fault that may resulted from broken or disconnected stator phase winding. The considered fault tolerant derive has the reconfiguration capability to support open winding faults which connect the neutral point of the motor to the mid point of the dc link. This allows exciting the remaining two windings and supports the fault tolerant operation. One of the main problems of this topology is the high torque and speed ripple generated during the fault mode operation. In this paper, a comprehensive literature review is presented to identify different fault tolerant converters and published control techniques. Then faulty mode operation with standard techniques is re-evaluated and based on the findings a control method is proposed to improve the performance of PMSM drive under open phase fault. Furthermore, a method to detect and


diagnose open phase faults and a control method to improve the faulty mode performance are also presented. Proposed control technique is verified in simulation result.

434 A Complete Bit-Stream Control System for Doubly Fed Induction Generator Applications

Jonathan Bradshaw, Student Member, IEEE, Dr. Udaya Madawala, Senior Member, IEEE, Dr. )itish Patel, Member, IEEE, Dr. Duleepa Thrimawithana, Member, IEEE Department of Electrical and Computer Engineering, The University of Auckland, )ew Zealand Bit-Stream based control, which uses one bit wide signals to control power electronics applications, is a new approach for controller design. A complete Bit-Stream based control system for a Doubly Fed Induction Generator (DFIG) is proposed in this paper to demonstrate an entirely hardware-based control system for DFIG applications. A new supervisory control system is proposed to provide excitation, synchronisation and generator speed controller. The rotor- and grid side converters, generator and control systems of the DFIG are simulated using Mentor Graphics ModelSim and experimentally tested using a 2.7 kW DFIG system. These simulation and experimental results confirm that the proposed Bit-Stream based control system successfully controls the generator synchronisation and speed. Keywords - Bit-Stream control, Field Programmable Gate Array (FPGA), Doubly Fed Induction Generator (DFIG).

480 A Static Two-Axis Model and Its Application in Direct Torque Control System for Brushless

Doubly Fed Induction Machine

Ai-ling ZHA)G, Xin WA)G Dept. of Electrical Engineering, Taiyuan University of Technology, China In order to simplify the system structure and improve the control precision, a static two-axis model for brushless doubly fed induction machine is presented in this paper. The two subsystems of the model are respectively built on αβ reference frames of power winding and control winding. On this basis, a direct torque control strategy has been proposed. The flux and torque is estimated on the two static reference frames, avoiding the rotation transformation and speed measurement error. In addition, the switch table applied to both sub-synchronous and super-synchronous is constructed. The machine model and the control strategies are developed in MATLAB. The simulation results show that the estimation of the torque is feasibility. The brushless doubly fed induction machine is stably controlled under a step change in a given speed and load torque. The parameters used in it are less and rotation transformation is avoided.

468 A Completely Smooth Transition Buck-Boost Converter with Continuity-Mode (CM)

Technique for Only Using 2 Switches in Whole Battery Life Kian-Fu Wong, Chien-Hung Tsai Department of Electrical Engineering / Advanced Optoelectronic Technology Center (AOTC) / Green Energy Electronics Research Center (GREERC) )ational Cheng-Kung University, Tainan, Taiwan, R.O.C. In this paper, a high efficiency and completely smooth transition between buck and boost mode, non-inverting Buck-Boost Converter with Continuity-Mode (CM) Technique is presented. The proposed continuity mode technique provides smooth transition and minimizes the switching and conduction losses better than conventional buffer mode. It just like buck or boost mode, the number of switches are used in one switching cycle is reduced from four to two and the inductor current is reduced to close to the value of load current. The results show the problem of pulse skipping in mode transition region is removed and without expense any unnecessary power losses. The dc output voltage is regulated on 3.3V in whole decreasing battery life. The output voltage ripple is reduced in transition region due to without pulse skipping and approximate to zero due to the duty cycle is close to almost 100% when the input voltage equal to output voltage.


Session Applications of Power Electronics in Home Appliance, Industry and Aerospace I (APEHIA-I) Date/Time Thursday, 08 December 2011/09:00 – 10:40 hrs Venue Connection Room 2 Chair Shyh-Jier Huang, National Cheng Kung University, Tainan, Taiwan 67 Study and Implementation of a High Output Current Inverter with a Current Doubler

Rectifier

Sen-Tung Wu1, Jian-Min Wang2 and Yu-Kang Lo1

1)ational Taiwan University of Science and Technology )o. 43, Sec. 4, Keelung Taipei, 10607, Taiwan 2)ational Formosa University )o. 64, Wunhua Road Yunlin, 632, Taiwan An effective and simple inverter for an arc welding machine is proposed in this paper. In order to lower the output ripple current efficiently, a current double rectifier can be used to solve the problem. However, the lower inductance of the current double rectifier can reduce the larger voltage spike when the output current goes alternately. Besides, the turn numbers of the main transformer in the proposed scheme is also lower than the conventional structure. At last, the output current will reach to 100-A to implement an arc welding machine in reality.

387 Design of a Digital Controlled Solar Water Pump Drive System for a Bano-filtration System Chuanlin Jin, Wei Jiang Smart Energy Laboratory School of Energy and Power Engineering, Yangzhou University, Yangzhou, China Stand-alone solar power system provides simple yet flexible solution to certain applications which demand high mobility. This paper introduces the design of a single solar panel powered induction machine-driven water pump system, which is used in an on-board nano-filtration system. The system configuration is evaluated at the first stage to provide high ratio voltage step-up; complementary PWM and space vector PWM scheme is chosen for dc-dc stage and dc-ac stage respectively; V/F based control scheme is designed and integrated with maximum power point tracking algorithm for the best use of solar panel. The control system is implemented digitally in a TMS320F2812 DSC. Meaningful mode of operation is tested and satisfactory experimental results are collected.

205 Enhancement of Piezoelectric Transformer-Based LED Lighting System with Tracking

Mechanism

Shyh-Jier Huang, Senior Member, IEEE, and Tsong-Shing Lee )ational Cheng Kung University, Taiwan, R. O. C. This paper proposes a new resonant circuit enhanced with a new tracking control approach for a piezoelectric transformer-based LED lighting system. In this method, the LED driver architecture features full bridge phase shift converter with C-L-C series-resonant circuit along with the piezoelectric transformer. Then, the concept of tracking control is well designated into the FPGA controller such that a higher efficiency of operation can be better reached. Besides, since only the secondary current of resonant transformer is needed for the controller, it helps facilitate the circuit implementation. From experimental results, they solidify the feasibility of this method for modular LED lighting applications. Keywords - Piezoelectric Transformer, LED, tracking.

211 Optimal Control Design Method for Trans-Linked Type Multi-Phase Boost Converter

Yuta )akamura, Masayoshi Yamamoto Shimane University

In recent years, the boost converter system with compact and light weight performance have been required in the Hybrid Electric Vehicle and Electric Vehicle applications. To obtain the miniaturization performance for the passive circuit component, such as the inductor and the smoothing capacitor, the multi-phase method


boost chopper circuit with the coupled inductor have been proposed and discussed. This paper presents the optimal control design technique for the trans-linked type multi-phase boost chopper circuit. To perform the control design, the frequency property of the proposal circuit is analyzed by using state space averaging method. The control system is designed by using the derived frequency property as well. Furthermore, the validity and utility of this method are evaluated and discussed from the experimental point of view. Keywords - DC-DC converter, coupled inductor, state space averaging method, frequency property

267 Optimal Design of Digital Control System for Interleaved Boost Chopper Circuit with the

Coupled Inductor Kenta kono, Yuta )akamura, Masayoshi Yamamoto Shimane University

This paper presents a digital control technique for the interleaved boost chopper circuit with the coupled inductor that achieves the miniaturization of boost chopper circuit. The digital re-design method is selected as design technique. In this control technique, the continuous-time controller is first designed to make the controlled system stable. Next, that controller is converted into discrete-time controller based on a well-known approach to the discrete-time modeling. The effectiveness of this conversion is confirmed on the frequency property. Furthermore, the digital control design approaches presented here is validated with experimental results.

Session Renewable Energy Technologies III (RET-III) Date/Time Thursday, 08 December 2011/09:00 – 10:40 hrs Venue Connection Room 4 Chair Yie-Tone Chen, National Yunlin University of Science & Technology, Taiwan

157 Design and Implementation of a Hybrid Maximum Power Point Tracker in Solar Power

System

Cheng-Yu Tang, Student Member, IEEE, Sheng-Yuan Ou, Member, IEEE, and Yu-Chun Su Department of Electrical Engineering, )ational Taipei University of Technology, Taiwan

This paper provides a hybrid maximum power point tracker (MPPT) with both perturbation and observation method and open circuit voltage method in solar power system. The open circuit voltage method is initially used to retrieve the open circuit voltage corresponding to maximum power point. The perturbation and observation method starts up instead while the input voltage of the power converter reaches the calculated maximum voltage. Furthermore, a variable range is defined by the calculated maximum voltages, and the perturbation and observation method is still used for MPPT if the subsequently sensed voltage value falls within this determined range. On the other hand, the open circuit voltage method is reused to function as MPPT again if the sensed voltage value does not fall within the range. That is, the proposed method will omit small power perturbation to decrease the tracking time and oscillation phenomenon at maximum power point caused by conventional perturbation and observation method, and therefore the loss reduction. The duty cycle is set the same as the previous duty cycle while the observed power reaches the predetermined range. HT46F49E MCU is used to implement the proposed MPPT method and a boost converter is utilized to act the power topology. The experiments confirm with the predetermined results.

198 A Bew DSP-Based ZVT Photovoltaic Energy Conversion System

Yie-Tone Chen, Member, IEEE and Chi-Jer Lan Department of Electrical Engineering )ational Yunlin University of Science and Technology Yunlin, Taiwan 640, R.O.C.

This paper proposes two new topologies-zero voltage transition (ZVT) charge and discharge converters applied to the renewable photovoltaic energy conversion system. Aside from the capability of making the


maximum power point tracking (MPPT), the main switch also has the capability of ZVT, which could minimize the loss caused by the transition of the switch. Also, the energy transformed from the switch could be transferred to the battery and recharge the battery. The battery could also be recharged and discharged to achieve the energy balance of system. Furthermore, the battery voltage is not needed to be the same as the DC bus voltage in the proposed system. The conversion system therefore has more design flexibility in the choice of the battery voltage and DC bus voltage.

280 A MPPT Control Method for Stand-Alone Photovoltaic System in Consideration of Partial

Shadow Yuya Oshiro, Hikaru Ono, )aomitsu Urasaki Dept. of Electronics Engineering, University of the Ryukyus 1 Senbaru )ishihara-cho )akagami Okinawa, 903-0213 Japan This paper presents a modified maximum power point tracking (MPPT) method for photovoltaic (PV). In this method, both the open-circuit voltage and short-circuit current of PV are instantaneously measured to distinguish between irradiance change and the occurrence of partial shadow when the output power of PV changes. The method can successfully operate even though a partial shadow arises. The rapid and accurate operation of the proposed MPPT method is confirmed by simulation results.

344 Verification of Efficacy of the Improved PSO-based MPPT Controlling Multiple Photovoltaic

Arrays

Vanxay Phimmasone1, Yuta Kondo1, Takayoshi Kamejima1, Masafumi Miyatake2 1Graduate School of Electrical and Electronic Engineering, Sophia University, Tokyo, Japan 2Department of Engineering and applied Science, Sophia University, Tokyo, Japan Photovoltaic (PV) generation systems need maximum power point tracker because the PV power output depends on the operating voltage and current. Further, multiple local maximum power points (MPPs) appear in the power-voltage characteristics under partial shading conditions, hence finding the global MPP using conventional MPPT techniques is a difficult task. To overcome this difficulty, the authors improved MPPT algorithm by introducing a Particle Swarm Optimization (PSO) technique. PSO’s feature is it uses only one pair of sensors to control and has extensibility in a multiple dimension. In this paper, the authors tried to verify the extensibility of the improved method, Initialization and Repulsion PSO (IR-PSO) in multiple photovoltaic arrays under various types of change in insolation and partial shading conditions. Thereby, these methods resulting in lower cost, higher overall efficiency and simplicity of its implementation. IR-PSO method was verified through simulation and experimental studies. The detailed performance comparisons with other methods, Initialization PSO (I-PSO), Repulsion PSO (R-PSO), are presented.

Session Switch-Mode Power Supplies and UPS I (SMPS-I) Date/Time Thursday, 08 December 2011/11:00 – 12:40 hrs Venue Connection Room 4 Chair Ying-Yu Tzou, National Chiao Tung University, Taiwan

419 A DSP-Based Bipolar Switching Power Supply

Yueh-Ru Yang Mingchi University of Technology This paper depicts a bipolar switching power supply designed for generating AC, DC, and other user-defined specific waveforms. The bipolar power supply is composed of a remote control board and a power supply module. The power supply module consists of a digital signal processor, an intelligent power module and an LC filter. A twisted-pair wire of CAN bus connects the remote control board and the power supply module. Output of the power supply module is set by the control board with a 4x4 keypad or through a LabVIEW


interface program. The program downloads the data of user-defined waveforms, such as triangular, square, saw-tooth and step waves, to the control board with RS232 protocol. To demonstrate the idea, an experimental power supply is built up. The range of output voltage is from 5 to 110 volts and output frequency is from 6.5 to 110Hz. The maximum output current is 4 amperes.

438 Light Load Efficiency Improvement for AC/DC Boost PFC Converters by Digital Multi-Mode

Control Method Wei-Shung Wang and Ying-Yu Tzou, Member, IEEE Power Electronic Systems and Chips Lab. Department of Electrical Engineering )ational Chiao Tung Univ., Hsinchu, Taiwan This paper presents a method to improve light load efficiency and reduce the THD of input current of a boost PFC converter used in applications to high performance server power supply units. The conventional constant frequency average current mode control scheme will result lower efficiency and high THD current distortion under light load operation. To overcome this problem, this paper proposes a digital multi-mode control scheme with variable switching frequency control. A nonlinear control scheme with modified gain scheduling has been used to improve dynamic response under light load condition with discontinuous conduction mode (DCM) operation with lower switching frequency. A green mode controller has been developed to change its control mode based on the required line current command under various load conditions. The proposed control scheme has been verified by using simulation and realized by using a DSP TMS32028035 in applications to a single-phase 675W boost PFC AC/DC converter. Experimental results are given to illustrate the feasibility of the proposed control scheme. Keywords - Power Factor Correction, Digital Multi-Mode Control Method, Green Mode Controller, Light Load Efficiency.

201 Design and Implementation of Digital Controllerusing FPGA for 200-kHz PWM Inverter

Shinya Suzuki, Keiji Wada and Toshihisa Shimizu Tokyo Metropolitan University, 1-1 Minami Osawa, Hachioji, Tokyo, JAPA) This paper presents design procedure of a 200 kHz PWM inverter with a current controller. The switching devices of the inverter consist of Si-MOSFETs and SiC-SBDs, and an FPGA is used for digital control of output current waveforms. The authors have developed an FPGA controller with high-speed and synchronous AD converter. The processing time of FPGA can be ignored because of less than 100 ns, and the time delay of an AD converter could not also be taken into account. A laboratory system rated at 200-kHz PWM inverter is confirmed that the validity of the design procedure from the experimental results. Finally, the experimental results of 10-kHz sinusoidal current control will be shown. Keywords - Current Control, FPGA, High-frequency, PWM Inverter

315 Bridgeless Power Factor Correction Circuits with Voltage-Doubler Configuration Dylan Dah-Chuan Lu and Wenfei Wang Power Engineering Laboratory School of Electrical and Information Engineering, The University of Sydney, )SW 2006, Australia This paper presents a generalized approach to deriving single-phase power factor correction (PFC) circuits with bridgeless and voltage-doubler structures. The approach requires two dc/dc converters connected in a parallel-input series-output manner. Compared to conventional full-bridge diode rectified PFC circuit, which has two diodes along the input current path, the PFC circuits derived by this approach have one diode only, hence reducing the converter losses. Through the proposed approach, some recently reported bridgeless PFC circuits have been identified and new possible combinations can be generated. A design example of dual buck dc/dc converters operating in discontinuous-input-voltage mode (DIVM) is presented to demonstrate the usefulness of the proposed approach.


180 Design, Simulation and Implementation of an Adaptive controller on base of Artificial Beural

Betworks for a Resonant DC-DC Converter Mohammad Jafari1 and Zahra Malekjamshidi2 1Department of Electrical Engineering, Fasa branch, Islamic Azad University Fasa, Iran 2Department of Electrical Engineering, Marvdasht branch, Islamic Azad University Marvdasht, Iran

A new method of control for high-voltage Full Bridge Series-Parallel Resonant (FBSPR) DC-DC converter with capacitive output filter, using Artificial Neural Networks (ANN) is proposed in this paper. The output voltage regulation obtained via high switching frequency and Soft switching operation (ZCS and ZVS technologies) to decrease the losses and optimize the efficiency of converter. In the following sections, The small signal model of converter is used to simulate the dynamic behavior of real converter using Matlab software. It was also used to obtain ideal control signals which are the desired ANN inputs and outputs and were saved as a training data set. The data set is then used to train the ANN to mimic the behavior of the ideal controller. In fact the ANN controller is trained according to the small signal model of converter and the ideal operating points. To compare the performances of simulated and practical ANN controller, a prototype is designed and implemented and is tested for step changes in both output load and reference voltage. Comparison between experimental and simulations show a very good agreement and the reliability of ANN based controllers. Keywords - Full Bridge, Series-Parallel Resonant Converter, Artificial Neural Networks, ANN, ZVS, ZCS.

Session Analysis and Design of Electrical Machines I (ADEM-I) Date/Time Thursday, 08 December 2011/11:00 – 12:40 hrs Venue Connection Room 1 Chair Vanja Ambrožič, University of Ljubljana, Slovenia

156 Diagnosis of Multi-Phase Turn Faults of Induction Motor Stator-Windings

Toshiji Kato, Kaoru Inoue and Keisuke Yoshida Department of Electrical Engineering, Doshisha University, Kyotanabe, JAPA)

In an AC motor,the quick detection of an initially small fault is important for preventing any consequent large fault.Various detection approaches have been proposed in previous papers, for example, by the Park vector (PV), AI techniques, wavelet analysis,and negative-sequence analysis. This paper proposes a method for diagnosing the stator-winding faults of an induction motor by the direct detection of its negative-sequence current. Before starting the diagnosis, the asymmetry admittances for the considered fault cases are obtained by analysis or simulation. The amplitude and phase of the positive-sequence voltage, Vp, and of the positive-sequence current, Ip,are extracted from the voltage PV and current PV,respectively. The amplitude and phase of the negative-sequence, In, are extracted from the residue. The asymmetry admittance, Ya, is calculated from In and Vp. When the positive-sequence admittance is known, Ya can also be calculated from Yp, Ip, and In. These steps are repeated for each sample time and the motor condition is diagnosed according to the variations in the Ya values. The simulation and experimental results are also shown and the proposed method is investigated and validated.

428 Impact of Manufacturing Imperfections on Cogging Torque Level in PMSM Lovrenc Gašparin1, Rastko Fiser2 1Iskra Avtoelektrika d.d., Polje 15, 5290 Šempeter pri Gorici, Slovenia 2University of Ljubljana, Faculty of Electrical Engineering, Tržaška 25, 1000 Ljubljana, Slovenia A detailed analysis of cogging torque components reveals that besides well-know native cogging torque components exist also additional cogging torque components which are provoked by assembly tolerances in mass–production. Since these two groups of cogging torque components are within reference to common


applied design techniques mostly in contradiction, a minimization of the total cogging torque becomes a challenging task for motor designers. A finite element method and Fast Fourier transformation were used to study and analyse a simple model of PMSM and a real design of PMSM from mass-production which enable simulation of manufacturing tolerances and assembly imperfections. Calculations and measurements confirmed that imprecision in mass–production cause the phenomena of additional cogging torque harmonic components, which are not present in the case of a perfectly assembled motor.

449 Advanced generator design using Pareto-optimization Martin R. Kuhn German Aerospace Center (DLR), Institute of Robotics and Mechatronics In upcoming and future more-electric airplanes more electrical loads connected to the power distribution network will behave nonlinearly and will be switching with advanced demands on the network to keep the power quality. While a lot of effort was already spent on techniques to design the network structure and filters, also the generators have to face the new demands and constraints. Trade offs between performance, weight, and latterly power quality have to be made and design choices have to be backed up by qualitative and quantitative measures. Therefore a convenient design tool chain was elaborated for an externally excited synchronous generator. Pre-existing analytic design functions containing electrical, mechanical and thermal analytical models were expanded by a new criterion for power quality. This criterion defined by industrial standards was included via virtual tests by time-domain simulation. Frequency domain criteria were gained in simulation by new signal property monitor blocks. Standards' conformance is visualized conveniently. A state of the art genetic algorithm similar to NSGA-II was applied to generate the Pareto-front of contrary design trade offs. Several convenient visualizations of the Pareto results are presented, which clearly link the parameters, tuners and output results. To ease the transition from theoretical design to the 3d mechanical layout, a CATIA model of the optimized generator candidate is generated directly from Matlab.

287 Single-Phase Active Current-Source Rectifier Operated with Power Factor and Distortion

Power Factor Control Jan Michalík1, Jan Molnár2 and Zdeněk Peroutka2 University of West Bohemia / 1Dept. of Electromechanics and Power electronics / 2RICE, Plzeň, Czech Republic n this paper, new control strategy of single phase active current-source rectifier (ACSR) able to control Power Factor (PF) as well as Distortion Power Factor (DPF) will be presented. The PF part is based on direct cos φ control with phase shift controller, the DPF part provides active mitigation of selected low-frequency harmonics in trolley-wire current using resonant (R) controllers. The ACSR developed within the research into a new generation of main traction converters employing medium-frequency transformer dedicated for suburban units operating on both ac electrification systems of 25kV/50 Hz and 15kV/16,7 Hz. Proper function of proposed control strategy with a new compensative principle has been verified by simulations and large experimental study made on designed small-scale prototype of ACSR of rated power of 7kVA.

455 Space Vector Based Hybrid Random Pulse Width Modulation Technique for a 3-Level

Inverter David Solomon George, M. R. Baiju Power Electronics Research Laboratory Dept. of Electronics & Communication College of Engineering, Trivandrum Kerala, India This paper proposes a Space Vector based Random Pulse Width Modulation technique (RPWM) for a 3-level inverter. Randomization is achieved by random placement of active vectors in fixed switching time period. Flexibility in random placement is limited when the duration of active vectors is comparable with switching time period. In such case, this paper proposes a hybrid operation where, in addition to random placement of active vectors, switching frequency is also varied randomly for every PWM cycle. In hybrid operation, switching frequency is limited in the range 2.5±1KHz by limiting the bounds of the


randomization. The proposed scheme uses a mapping technique, by which, randomization is effected to the vectors of a 2-level inverter. From random vectors of 2-level inverter, random switching vectors for the 3-level inverter are derived. The proposed scheme does not require any external circuitry and it can be implemented for any 3-level inverter topology. The algorithm is implemented in TMS320LF2407 DSP platform for a 2-hp induction motor driven by a 3-level inverter in open-end winding configuration and experimental results are presented.

Session Applications of Power Electronics in Home Appliance, Industry and Aerospace II (APEHIA-II) Date/Time Thursday, 08 December 2011/11:00 – 12:40 hrs Venue Connection Room 2 Chair Fu-Sheng Pai, National University of Tainan, Taiwan

331 Design of a Lithium-Iron Battery Charger with the Open-Circuit Voltage Function Evaluation Bo-Ge Huang1, Fu-Sheng Pai2, Member, IEEE, Shyh-Jier Huang1, Senior Member, IEEE and Yu-Jhe Li1 1)ational Cheng Kung University Department of Electrical Engineering Tainan, Taiwan 2)ational University of Tainan Department of Electrical Engineering Tainan, Taiwan This paper is aimed to develop a Li-ion battery charger with the intelligent decisions based on OCV information of the battery. In this method, the OCV function can be formulated through the measurement of output voltage with respect to a certain SOC value. Then using the obtained dynamics of battery intrinsic, a fast charging method can be developed to reach speedy and full charge without entering over-charging area. The method proposed in this paper is examined under various scenarios. The results help consolidate the feasibility and practicability of the approach for the applications considered. Keywords - Li-ion battery, OCV function.

383 An Experimental Verification and Analysis of a Single-phase to Three-phase Matrix Converter

using PDM Control Method for High-frequency Applications

Yuki )akata and Jun-ichi Itoh )agaoka University of Technology This paper discusses the PDM (Pulse Density Modulation) control method for a single-phase to three-phase matrix converter (MC) in the high-frequency application. The proposed circuit is used as an interface converter for a wireless power transfer system. This converter can input a several hundred kHz frequency and outputting a low frequency, ie 50 Hz, for commercial power grid. The proposed circuit achieves zero voltage switching (ZVS) operation by using the PDM control method and obtains high efficiency. In this paper, the PDM control strategy is using delta-sigma conversion and improving the PDM pattern generation method based on Space Vector Modulation (SVM). Also, the simulation, experimental and loss analysis results of the proposed system will be demonstrated and discussed. As a result, the total harmonic distortion (THD) of the input current and the output voltage are 84.6 % and 5.4 % respectively. The efficiency of 91.5% is obtained from the prototype circuit. Additionally, the effect of power source side impedance for a high-frequency single-phase-to-three-phase MC is discussed. It is clear that the line-to-line capacitance at the power source side must be kept as small as possible in order to suppress the resonance

337 Improvement of Self-Oscillating Electronic Ballast with High Power Factor: A Combination of

Charged-Pump and Valley-Fill

Sarayoot Thongkullaphat1,2, Pisit Liutanakul2 and Viboon Chunkag2 1Department of Electrical Engineering, Faculty of Engineering and Architecture Rajamangala University of Technology Suvarnabhumi (RMUTSB), )onthaburi, Thailand 2Greenergy Research Group (GRG), Department of Electrical Engineering, Faculty of Engineer King Mongkut’s University of Technology )orth Bangkok (KMUT)B), Bangkok, Thailand


This paper proposes a novel 36W / 220Vrms / 50Hz of half-bridge inverter self-oscillating electronic ballast for a fluorescent lamp with high power factor and low line input current harmonics. The system performance can be improved by combining together with a charged pump and valley fill circuit. Details of design and circuit operation are described. This ballast is developed to reduce a number of ICs controlling power electronic switches that are costly and sizeable. Instead of these ICs, This ballast employs self-oscillation method to control power electronic switches. The combination of a bridge rectifier, current source charge pump with valley fill circuit to improve power factor and Series - Resonant Parallel - Load Inverter (SRPLI) are main concept. This electronic ballast is designed and tested to find the proper frequency and signal to stimulate the operation of power electronic switches to trigger fluorescent lamp suitably. The experimental results show that the proper frequency of the prototype is around 40 kHz with input power factor of 0.988, THDi 4.7% at full load and efficiency of more than 90%. Keywords - electronic ballast, self-oscillated, Valley-fill (VF) Current-source Charge-pump (CS-CP)

380 Experimental Verification of Rectifiers with SiC/GaB for Wireless Power Transfer Using a

Magnetic Resonance Coupling

Keisuke Kusaka and Jun-ichi Itoh )agaoka University of Technology This paper demonstrates that SiC and GaN diode rectifiers are used in a magnetic resonant coupling (MRC) for wireless power transfer system. The size of the resonance coils, which are used in the wireless power transfer using a MRC, depends on the transmission frequency. So, the MRC is desired to operate at a high frequency in the Industry Science Medical (ISM) band such as 13.56 MHz. In the receiving side, a rectifier which converts to the DC voltage from high frequency AC voltage is necessary to supply the power to the applications such as a battery charger for EV and home appliances. The experimental results show the maximum efficiency from a Radio Frequency (RF) power supply to DC outputs is 75.2% when the transmission distance is 150 mm. In addition, A power loss separation method of the wireless power transfer system is discussed in this paper. The experimental results verify the reflected power of the resonance coil which dominates the largest amount of the loss in the total loss. Therefore, the suppression of the reflected power is important for the wireless power transfer system using a MRC.

447 Bovel Approach to Closed-Loop Control of Wire Bending Machine

Henrik Lavrič, Miroslav Bugeza, Rastko Fiser University of Ljubljana, Faculty of Electrical Engineering, Tržaška 25, 1000 Ljubljana, Slovenia This paper describes the problems in nowadays production of ribs, the most important assembling part of leverarch mechanism. The process of wire bending machine upgrade is presented and the control principle for ribs geometry stabilization is proposed. The overall control scheme consists of inner - force control loops and outer – geometry control loop. The inner loops control the force on respective roller of the horizontal and vertical plane of wire straightener according to the predefined reference values. These values are modified with the superior loop in respect of geometry variations of the rib. Required displacements of rollers are obtained using wedge systems driven by stepper motors. The final geometry of rib is analyzed by image processing algorithm inside the image acquisition system.

Session Renewable Energy Technologies IV (RET-IV) Date/Time Thursday, 08 December 2011/11:00 – 12:20 hrs Venue Ballroom 1 Chair Akshay K Rathore, National University of Singapore, Singapore

212 A Control Strategy for Series Connected Offshore Wind Turbines Alejandro Garces and Marta Molinas


Department of Electrical Power Engineering )orwegian University of Science and Technology Trondheim, )orway This paper presents a control strategy for HVDC systems based on pulse width modulated current source converters. The strategy is applicable to series connected off-shore wind farms where the line current must be controlled by the on-land converter while the off-shore voltage and power are controlled by converters allocated in each turbine. A three-stage hierarchical control based on proportional regulators was designed. Space vector modulation is used in the converter at medium switching frequency. The control and modulation show fast dynamic response and low harmonic distortion. This desirable behavior was demonstrated by simulation on a 16 MW system with an exact switching model of the semiconductor devices. both, short circuit and stationary state were studied. Keywords - Off shore wind energy, Current source converter, series connection, Wind farm layout

242 A Bew 98% Soft-Switching Full-Bridge DC-DC Converter based on Secondary-Side LC

Resonant Principle for PV Generation Systems

Daisuke Tsukiyama1, Yasuhiko Fukuda1, Shuji Miyake1, Saad Mekhilef2, Soon-Kurl Kwon3 and Mutsuo )akaoka3 1Dispersed Power System Division, Daihen Corporation, Osaka, Japan 2University of Malaya, Malaysia 3Kyungnam University, Republic of Korea/Yamaguchi University, Yamaguchi, Japan This paper is mainly concerned with the state-of-the-art feasible development of a novel prototype high-efficiency phase-shift soft-switching pulse modulated full-bridge DC-DC power converter with a high-frequency power transformer, which is designed for utility-grid tied photovoltaic (PV) power inverters. The proposed high-frequency transformer (HFTR) link DC-DC converter topology is based upon a new conceptual secondary-side series resonant principle and its inherent nature. All the active power switches in the HFTR primary-side can achieve lossless capacitive snubberbased ZVS with the aid of transformer parasitic inductances. In addition to this, passive power switches in its secondary-side can also perform ZVS and ZCS transitions for input voltage and load variations. In the first place, the operation principle of the newly-proposed DC-DC converter and some remarkable features are described in this paper on the basis of the simulation analysis. In the second place, the 5 kW experimental setup of the DC-DC converter treated here is demonstrated and its experimental results are illustrated from a practical point of view. Finally, some comparative evaluations between simulation and experimental data are actually discussed and considered in this paper, together with its future works. Keywords - DC-DC power converter, full bridge topology, high-frequency transformer link, secondary-side LC resonant principle, primary-side ZVS, secondary-side ZCZVS, photovoltaic generation system

172 A Bovel MPPT Algorithm for Load Protection Based on Output Sensing Control Mehdi Hassani1, Saad Mekhilef1, Aiguo Patrick Hu2 and )eville R. Watson3 1University of Malaya 2University of Auckland 3University of Canterbury This paper presents a novel maximum power point tracking (MPPT) algorithm for load protection based on output sensing control. All MPPTs are based on input sensing and there is a drawback in applications which load protection is essential. This drawback can be addressed by applying two more sensors at the output. However having two sensors at input side as well as two more at output will increase the size and cost of the controller. To address this drawback without the need to increase the number of sensors, a novel control system and tracking algorithm based on the output sensing control and P&O algorithm is proposed. The main difference of the proposed control system with existing systems is, moving the control sensors from input side to output side of controller and consequently, apart from providing MPPT algorithm, controller is also able to do load protection at the same time.


To demonstrate how the system operates in normal MPPT mode as well as how it operates for the load protection, the system is tested with different resistive loads and the simulation results indicate the feasibility and improved functionality of the system.

284 A Control Method for Maximum Power Point Tracking of a PMSG-Based WECS using Online

Parameter Identification of Wind Turbine

Yuya Izumi, Alok Pratap, Kosuke Uchida, Akie Uehara,Tomonobu Senjyu and Atsushi Yona The Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan This paper presents a control method for maximum power point tracking (MPPT) of a wind energy conversion system (WECS) using online parameter identification. The WECS is based on a permanent magnet synchronous generator (PMSG) and transmits its electrical power to an AC grid through an AC-DC-AC converter system with IGBT pulse-width modulation (PWM) converters. The generator-side converter optimally con-trols the torque of the PMSG to extract maximum wind power. On the other hand, the grid-side inverter controls the DC-link and grid voltages for stable operation of the WECS. Since an optimum torque of the PMSG may vary due to wind turbulence, parameter error, and other unexpected conditions, the optimum torque of the PMSG is determined by using the online parameter identification in this paper. The proposed method providesWECS operation with the maximum efficiency and economical benefit. Effectiveness of the proposed method is verified by the numerical simulations.

Session Switch-Mode Power Supplies and UPS II (SMPS-II) Date/Time Thursday, 08 December 2011/14:00 – 15:40 hrs Venue Connection Room 1 Chair Dylan Dah-Chuan Lu, University of Sydney, Australia

325 Robust Digital Voltage-Mode Controller for Synchronous Soft-Switching Boost Converter Mummadi Veerachary Dept. of Electrical Engineering, IIT Delhi, )ew Delhi, India In this paper robust digital voltage-mode controller design for a synchronous soft-switching boost converter is presented. Although it is a boost converter, but due to soft-switching nature the converter circuit exhibits five different modes of operations in one switching cycle and also results in zero-voltage transition to the switching devices. As there are several operating modes the small-signal z-domain transfer functions are formulated using system identification toolbox of the MATALB, and then used in the direct digital controller design. A pole-zero placement technique is adopted to arrive at final digital voltage-mode controller and then an edge theorem is employed for testing the robustness of the controller. Closed-loop converter performance is predetermined for a 25 to 100 V, 50 Watt prototype in simulation and then compared with experimental measurements. Experimental measurements are in close agreement with simulations.

328 Digital Two-Loop Controller Design for Fourth Order Split-Inductor Converter

Mummadi Veerachary Dept. of Electrical Engineering, IIT Delhi, )ew Delhi, India In this paper a digital two-loop controller design methodology is proposed for the fourth order split inductor converter load voltage regulation. The salient features of the split-inductor converter are compared with the conventional SEPIC converter and then discrete-time mathematical models are established. Digital two-loop controller, inner current-loop and outer voltage-loop, is designed using direct digital design approach. A two-pole two-zero compensator is adopted in the outer voltage-loop, while one-pole and one zero is used in the inner current-loop design. Compensator design is validated through simulations and then experimental measurements. Load voltage regulation characteristics are obtained against line and load perturbations. A 25


watt 15 to 36 V prototype converter is built and experimental investigations are carried out. The measured results obtained from the prototype converter are in close agreement with those obtained in the analysis.

388 A Bovel Fast Average Current Mode Digital Control for DC-DC Converter

Fujio Kurokawa, Kazuhiro Kajiwara Graduate School of Engineering, )agasaki University, Japan This paper introduces a novel fast average current mode digital control for dc-dc converter. The proposed control circuit has two features. First, the voltage controlled oscillator (VCO) is used for the switch/reactor current detection. The VCO is low price and can transform to digital value quickly without complex calculation when the current is detected. Second, the digital feedback value of output voltage can be calculated by the digital PID control with the fast P process. In the digital PID control with the fast P process, P and ID control are parallel processing and the sampling period of P control is shorter than the switching period due to shrink the delay time of output voltage calculation. In this paper, the input voltage or output current fluctuations characteristics of proposed circuit are studied. As results, the proposed method is superior transient response both of input voltage fluctuations and the output current ones in spite of small capacitance when the same coefficient of PID control is used..

399 Correlation-based System Identification of Digitally Controlled SMPS Jun-Yan Liu, Chun-Hung Yang, Chien-Hung Tsai Department of Electrical Engineering / Advanced Optoelectronic Technology Center (AOTC) / Green Energy Electronics Research Center (GREERC) )ational Cheng-Kung University, Tainan, Taiwan, R.O.C. This paper presents a design procedure using the correlation-based identification to determine the compensation coefficients. A method for verifying the compensation coefficients is also proposed. That solved the open-loop frequency response of digitally controlled switched-mode power supply is difficult to accurately measure and provided a method to test the function of digital compensators. Experimental results show that the open-loop and closed-loop frequency responses obtained using the correlation-based identification method are close to the measured frequency responses. Keywords - digital control, switched-mode power supply (SMPS), compensation, correlation-based identification, frequency response.

Session Applications of Power Electronics in Home Appliance, Industry and Aerospace III (APEHIA-III) Date/Time Thursday, 08 December 2011/14:00 – 15:40 hrs Venue Connection Room 2 Chair Akshay K Rathore, National University of Singapore, Singapore

86 Study of Effect of the Bonlinear Inductor Behavior on the Performance of Resonant Tank for

Driving Fluorescent Lamp Yitao Liu and Daming Zhang School of Electrical and Electronic Engineering )anyang Technological University, Singapore Applying Jiles-Atherton (JA) model to investigate the nonlinear inductance performance in the electronic ballast is a challenge but very attractive issue since it is possible to carry out continuous simulation with only several input parameters. In this paper J-A model has been successfully applied to model the dynamics of resonant inverter for driving a non-linear load: a fluorescent lamp. A semi-theoretical fluorescent lamp model developed from HID lamp model is adopted in this modeling. The whole system has been implemented in the Simulink of Matlab and the simulation results of voltage across the lamp and inductor and current through them are close to those measured ones reported in the literature papers.


393 Single-Switch Constant-Power Equalization Charger Based on Multi-Stacked Buck-Boost

Converters for Series-Connected Supercapacitors in Satellite Power Systems Masatoshi Uno and Koji Tanaka Japan Aerospace Exploration Agency Supercapacitors (SCs) have potential to be good alternatives to batteries in satellite power systems because they not only have a longer life but also reduce the mass of photovoltaic arrays when they are charged using a constant-power (CP) charging scheme. In this paper, we propose single-switch CP equalization chargers using multi-stacked buck-boost converters. In addition to the single-switch operations, the equalization chargers operating in the discontinuous conduction mode (DCM) do not require feedback control, and hence, the feedback loop can be eliminated. Operations under voltage-balanced and voltage-imbalanced conditions were mathematically generalized. An experimental charge test was performed for four SCs connected in series. The SC(s) with the lowest voltage was (were) preferentially charged by the equalization charger. The voltage imbalance was gradually eliminated, and finally, all SCs were charged to a uniform voltage level.

471 Frequency Characteristics of Choke-Input-Type Diode Rectifier Circuit for Three-Phase

Rectangular-Voltage-Fed Distribution System Tomoaki Imaeda1, Takaharu Takeshita1 and Yasuyuki )ishida2 1)agoya Institute of Technology Gokiso, Showa, )agoya, Japan 2Chiba Institute of Technology Tsudanuma, )arashino, Chiba, Japan This paper presents an analysis of frequency characteristics of a choke-input-type diode rectifier circuit on a three-phase rectangular-voltage-fed distribution system and the selection of a frequency of the rectangular voltage. Moreover, a choke coil and a dc smoothing capacitor in the rectifier circuit are designed. The effectiveness of the analysis has been confirmed by experiments using the 2.4 kW prototype.

456 Bew Evaluations on Soft Commutation Range of A Soft Switching PWM Boost DC-DC

Converter with Edge-Resonant Switched Capacitor Modular Yujiro Takeuchi1, Tomokazu Mishima1 and Mutsuo )akaoka2 1Graduate Sch. of Maritime Sci., Kobe University, 5-1-1, Fukaeminami-machi, Kobe, 658-0022 Japan 2The Electric Energy Saving Research Center, Kyungnam Univ./Prof. Emeritus of Yamaguchi Univ., The Republic of Korea/Yamaguchi, Japan This paper presents a new investigation for a soft commutation performance of a soft switching PWM non-isolated boost DC-DC converter embedding an ER-SWC (Edge Resonant SWitched Capacitor) modular. The conceptual DC-DC converter treated here can achieve a high frequency ZCS turn-on and ZVS turn-off commutations in active switches and minimization of a reverse recovering current in the freewheeling diode under DCM (Discontinuous Conduction Mode) including CRM (CRitical Mode) in the input current. Those advantageous enable a wide range of soft switching operations together with a high step-up voltage conversion ratio. For demonstrating the wide-range soft switching operation performed in the soft switching PWM boost DC-DC converter, a 1[kW]–44[kHz] laboratory prototype is evaluated in experiments, then its performances are discussed from a practical point of view.

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PEDS 2011 Conference Prog ramme 2 IEEE PEDS 2011 Conference Programme Schedule 5 December (Mon) 6 December (Tue) 7 December (Wed) 8 December (Thur) 0900 - 1040 HSSS-I MDMC-II