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No. PROJECT TITLES YEAR ABSTRACT
IEEE 2016 PROJECTS
001 Front-End Isolated Quasi-Z-
Source DC-DC Converter
Modules in Series for
Photovoltaic High- Voltage DC
Applications
IEEE 2016
A quasi-Z-source modular cascaded converter (qZS-
MCC) is proposed for high-voltage (HV) dc
integration of photovoltaic (PV) power. The qZS-MCC
comprises frontend isolated qZS half-bridge (HB) dc-
dc converter sub modules (SMs) in series. By the qZS-
HB handling PV voltage and power variations, a
unified duty cycle is applicable for the front-end
isolation converter of all SMs. Resultantly, the
proposed system improves the quasi-Z-source
cascaded multilevel inverter and the modular
multilevel converter based PV counterparts in terms of
no double-line-frequency pulsating power so as to low
qZS impedance, HV dc collection of PV power thus to
reduce conversion stages for dc transmission, and
overcoming the limit of series-output voltage with
simple galvanic isolation. Operating principle and
power loss evaluation of the qZS-MCC are presented.
Parameter design guidelines and simulation are
addressed based on a 60- kW SM; experimental results
are carried out on a downscaled prototype as a proof-
of-concept, demonstrating the validity of the proposed
system.
002 A Single-Phase PV Quasi-Z-
Source Inverter With Reduced
Capacitance Using Modified
Modulation and Double-
Frequency Ripple Suppression
Control
IEEE 2016
In single-phase photovoltaic (PV) system, there is
Double-frequency power mismatch existed between
the dc input and ac output. The double-frequency
ripple (DFR) energy needs to be buffered by passive
network. Otherwise, the ripple energy will flow into
the input side and adversely affect the PV energy
harvest. In a conventional PV system, electrolytic
capacitors are usually used for this purpose due to
their high capacitance. However, electrolytic
capacitors are considered to be one of the most failure
prone components in a PV inverter. In this paper, a
capacitance reduction control strategy is proposed to
buffer the DFR energy in single-phase Z-source/quasi-
Z-source inverter applications. Without using any
extra hardware components, the proposed control
Strategy can significantly reduce the capacitance
requirement and achieve low input voltage DFR.
Consequently, highly reliable film capacitors can be
used. The increased switching device voltage stress and
power loss due to the proposed control strategy will
also be discussed. A 1-kW quasi-Z-source PV inverter
using gallium nitride (GaN) devices is built in the lab.
Experimental results are provided to verify the
effectiveness of the proposed method.
003 High-Gain Single-Stage Boosting
Inverter for Photovoltaic
Applications
IEEE 2016
This paper introduces a high-gain single-stage
boosting inverter (SSBI) for alternative energy
generation. As compared to the traditional two-stage
approach, the SSBI has a simpler topology and a lower
component count. One cycle control was employed to
generate ac voltage output. This paper presents
theoretical analysis,simulation and experimental
results obtained from a 200 W prototype. The
experimental results reveal that the proposed SSBI
can achieve high dc input voltage boosting, good dc–ac
power decoupling,good quality of ac output waveform,
and good conversionefficiency.
004 Highly Efficient Asymmetrical
PWM Full-Bridge Converter for
Renewable Energy Sources
IEEE 2016
This paper presents a highly efficient
asymmetrical pulse-width modulated (APWM) full-
bridgeconverter for renewable energy sources. The
proposed converter adopts full-bridge topology and
asymmetric control scheme to achieve the zero-voltage
switching (ZVS) turn-on of the power switches of the
primary side and to reduce the circulating current
loss. Moreover, the resonant circuit composed of the
leakage inductance of the transformer and the
blocking capacitor provides the zero-current switching
(ZCS) turn-off for the output diode without the help of
any auxiliary circuits. Thus, the reverse recovery
problem of the output diode is eliminated. In addition,
voltage stresses of the power switches are clamped
to the input voltage. Due to these characteristics, the
proposed converter has the structure to minimize
power losses. It is especially beneficial to the renewable
energy conversion systems. To confirm the theoretical
analysis and validity of the proposed converter, a 400
W prototype isimplemented with the input voltage
range from 40 to 80 V.
005 A High-Efficiency Flyback
Micro-inverter With a New
Adaptive Snubber for
Photovoltaic Applications
IEEE 2016
Based on the hybrid operation of interleaved flyback
micro-inverter in discontinuous and boundary
conduction modes (DCM and BCM), a novel adaptive
snubber is proposed in this paper. The proposed
snubber limits the drain-to-source voltage
overshoot of the flyback’s main switch during the
turn-off process,enabling the use of lower voltage
MOSFETs. It also recovers the stored energy in the
leakage inductance of the flyback transformer
and provides soft switching for the main flyback
switch by limiting the rising slope of the MOSFET
voltage during the turn-off process resulting in higher
efficiency. Exploiting the natural resonant of the
flyback converter in BCM, the adopted controller
provides ZVS and ZCS for the main switch during the
BCM operation. The operation of the flyback micro-
inverter with associated controllers is analytically
studied, and considerations for an optimum design
aiming to higher efficiency are presented. Performance
ofthe flybackmicro-inverter with the proposed
adaptive snubber and the corresponding controllers is
experimentally verified based on a 250W interleaved
flyback micro-inverter hardware setup.
006 An Optimal Method to Design a
Trap-CL Filter for a PV AC-
Module Based on Flyback
Inverter
IEEE 2016
The power factor and total harmonic distortion
(THD) are important considerations when designing
an output filter.In the case of the photovoltaic (PV) ac-
module, the size and weight also have to be taken into
consideration. This paper proposes an output filter to
reduce size and weight, and provides the optimal
design method for a PV ac-module. The proposed
output filter consists mainly of a conventional CL filter
with a trap filter.The trap filter is used to eliminate the
harmonic at the switching frequency that contains
most of the harmonics. Therefore, total inductance and
the size of the filter can be reduced although the
output filter components are increased. This paper
presents analysis of the proposed filter characteristics
in detail. Also, an optimal design method reducing the
size of the output filter components including the
damping resistor is proposed. The proposed methods
are verified on the experimental prototype rated at
320Wwith an ac-module based on the interleaved
flyback inverter. The total filter inductance and
volume are, respectively, reduced to 9.54% and
26.62% with the same performance.
007 Highly Reliable Transformerless
Photovoltaic Inverters With
Leakage Current and Pulsating
Power Elimination
IEEE 2016
This paper presents a transformerless inverter
topology, which is capable of simultaneously solving
leakage current and pulsating power issues in grid-
connected photovoltaic (PV) systems. Without adding
any additional components to the system, the leakage
current caused by the PV-to-ground parasitic
capacitance can be bypassed
by introducing a common-mode (CM) conducting path
to the inverter. The resulting ground leakage current
is therefore well controlled to be below the regulation
limit.Furthermore, the proposed inverter can also
eliminate the well-known double-line-frequency
pulsating power that is inherent in single-phase PV
systems. By properly injecting CM voltages to the
output filter capacitors, the pulsating power can be
decoupled from the dc-link. Therefore, it is possible to
use long-lifetime film capacitors instead of electrolytic
capacitors to improve the reliability of the PV
system. The mechanism of leakage current suppression
and the closed-loop control of pulsating power
decoupling are discussed in this paper in detail. A 500-
W prototypewas also built and tested in the
laboratory, and both simulation and experimental
results are finally presented to show the excellent
performance of the proposed PV inverter.
008 Transformerless Photovoltaic
Inverter Based on Interleaving
High-Frequency Legs Having
Bidirectional Capability
IEEE 2016
A novel bidirectional transformerless photovoltaic
(PV) inverter based on the high-frequency leg (HFL)
technique is proposed which can work on
discontinuous current mode/continuous current mode
having greatly enhanced reliability. With the high-
frequency leg, the smooth ac current is achieved
as the higher equivalent switching frequency can
reduce the inductor current ripple decreasing the
passive components’ volume. There is no dead time
issue which can push the duty cycle to the
theoretical limit and fully transfer the energy to grid
through total pulse widthmodulation. And the capacity
of the PV inverter can be expanded easily by
increasing the number of high-frequency
legs.Additionally, the proposed topology can work
under the rectifier mode having the bidirectional
power capability, which is attractive for the PV
application. In the end, the experimental results of 8-
kW laboratory prototype have verified the feasibility
and effectiveness of the proposed transformerless PV
inverter under standalone mode.
009 Design and Analysis of a High-
Efficiency DC–DC Converter
With Soft Switching Capability
for Renewable Energy
Applications Requiring High
IEEE 2016
Renewable sources like solar photovoltaic (PV) and
fuel cell stack are preferred to be operated at low
voltages. For applications such as grid-tied systems,
this necessitates high voltage boosting resulting in
efficiency reduction. To handle this issue, this paper
Voltage Gain proposes a novel high voltage gain, high-efficiency dc–
dc converter based on coupled inductor, intermediate
capacitor, and leakage energy recovery scheme. The
input energy acquired from the source is first stored in
the magnetic field of coupled inductor and
intermediate capacitor in a lossless manner.In
subsequent stages, it is passed on to the output section
for load consumption. A passive clamp network
around the primary inductor ensures the recovery of
energy trapped in the leakage inductance, leading to
drastic improvement in the voltage gain and efficiency
of the system. Exorbitant duty cycle values are not
required for high voltage gain, which prevents
problems such as diode reverse recovery.Presence of a
passive clamp network causes reduced voltage stress
on the switch. This enables the use of low voltage
rating switch (with low “ON-state” resistance),
improving the overall efficiency of the system.
Analyticaldetails of the proposed converter and its
hardware results are included.
010 Efficient Single Phase
Transformerless Inverter for
Grid-Tied PVG System With
Reactive Power Control
IEEE 2016
There has been an increasing interest in
transformerless inverter for grid-tied photovoltaic
(PV) system due to low cost, high efficiency, light
weight, etc. Therefore, many transformerless
topologies have been proposed and verified with real
power injection only. Recently, almost every
international regulation has imposed that a definite
amount of reactive power should be handled by the
grid-tied PV inverter. According to the standard
VDEAR-N 4105, grid-tied PV inverter of power rating
below 3.68KVA, should attain power factor (PF) from
0.95 leading to 0.95 lagging. IN this paper, a new high
efficiency transformerless topology is proposed for
grid-tied PV system with reactive power control.
The new topology structure and detail operation
principle with reactive power flow is described. The
high frequency commonmode (CM) model and the
control of the proposed topology are analyzed. The
inherent circuit structure of the proposed topology
does not lead itself to the reverse recovery issues even
when inject reactive power which allow utilizing
MOSFET switches to boost the overall efficiency. The
CM voltage is kept constant at midpoint of dc input
voltage, results low leakage current. Finally, to
validate the proposed topology, a 1 kW laboratory
prototype is built and tested. The experimental results
show that the proposed topology can inject reactive
power into the utility grid without any additional
current distortion and leakage current. The maximum
efficiency and European efficiency of the proposed
topology are measured and found to be 98.54% and
98.29%, respectively.
011 Single Phase Cascaded H5
Inverter with Leakage Current
Elimination for Transformerless
Photovoltaic System
IEEE 2016
Leakage current reduction is one of the important
issues for the transformelress PV systems. In this
Paper, the transformerless single-phase cascaded H-
bridge PV inverter is investigated. The common mode
model for the cascaded H4 inverter is analyzed. And
the reason why the conventional cascade H4 inverter
fails to reduce the leakage current is clarified. In order
to solve the problem, a new cascaded H5 inverter is
proposed to solve the leakage current issue. Finally,
the experimental results are presented to verify the
effectiveness of the proposed topology with the leakage
current reduction for the single phase transformerless
PV systems.
012 Bus Voltage Control With Zero
Distortion and High Bandwidth
for Single-Phase Solar Inverters
IEEE 2016
Single-phase inverters must include an energy storage
device, typically a high-voltage bus capacitor, to match
the inverter constant input power to its pulsating
output power. Because of its increased cost, the size of
this bus capacitor must be minimized. However, when
the bus capacitor is small, the bus voltage includes a
High ripple at the ac line second harmonic frequency,
which causes harmonic distortion. The bus voltage
controller must filter this ripple, while regulating the
bus voltage efficiently during transients, and must
therefore balance a tradeoff between two conflicting
constraints, low-harmonic distortion and high
bandwidth. This paper analyzes this tradeoff, and
proposes a new control method for solving it without
using addition hardware. Instead of reducing the
Distortion by lowering the loop gain, the new
controller employs a digital FIR filter that samples the
bus voltage at an integer multiple of the second
harmonic frequency. The filter presents a notch that
removes the second harmonic ripple, enabling a design
that operates with zero distortion and high bandwidth
simultaneously, and is suitable for inverters with small
bus capacitors. The proposed controller is tested on a
micro inverter prototype with a 300-W photovoltaic
panel and a 20-μF bus capacitor.
013 A Medium Frequency
Transformer-Based Wind
Offshore wind farms with series-interconnected
structures are promising configurations because bulky
Energy Conversion System Used
for Current Source Converter
Based Offshore Wind Farm
IEEE 2016
and costly offshore substations can be eliminated. In
this work, a medium-frequency transformer (MFT)-
based wind energy conversion system is proposed for
such wind farms based on current source converters.
The presented configuration consists of a medium-
voltage permanent magnet synchronous generator that
is connected to a low-cost passive rectifier, an MFT-
based cascaded converter, and an onshore current
source inverter. Apart from fulfilling traditional
control objectives (maximum power point tracking,
dc-link current control, and reactive power
regulation), this work endeavors to ensure evenly
distributed power and voltage sharing among the
constituent modules given the cascaded structure of
the MFT-based converter. In addition, this paper
thoroughly discusses the characteristic of decoupling
between the voltage/power balancing of the modular
converter and the other control objectives. Finally,
both simulation and experimental results are provided
to reflect the performance of the proposed system.
014 Sliding Mode Control of PMSG
Wind Turbine Based on
Enhanced Exponential Reaching
Law
IEEE 2016
This paper proposes a Sliding Mode Control (SMC)
based scheme for a variable speed, direct-driven
Wind Energy Conversion Systems (WECS) equipped
with Permanent Magnet Synchronous Generator
(PMSG) connected to the grid. In this work, diode
rectifier, boost converter, Neutral Point Clamped
(NPC) inverter and L filter are used as the interface
between the wind turbine and grid. This topology has
abundant features such as simplicity for low and
medium power wind turbine applications. It is also less
costly than back-to-back two-level converters in
medium power applications. SMC approach
demonstrates great performance in complicated
nonlinear systems control such as WECS. The
proposed control strategy modifies Reaching Law
(RL) of sliding mode technique to reduce chattering
issue and to improve THD property compared to
Conventional reaching law SMC. The effectiveness of
the proposed control strategy is explored by simulation
study on a 4 kW wind turbine, and then verified by
experimental tests for a 2 kW set-up.
015 Control and Operation of a DC
Grid-Based Wind Power
Generation System in a
This paper presents the design of a dc grid-based wind
Power generation system in a poultry farm. The
proposed system allows flexible operation of multiple
Microgrid
IEEE 2016
parallel-connected wind generators by eliminating the
need for voltage and frequency synchronization.
A model predictive control algorithm that offers better
Transient response with respect to the changes in the
operating conditions is proposed for the control of the
inverters. The design concept is verified through
various test scenarios to demonstrate the operational
capability of the proposed micro grid when it operates
Connected to and islanded from the distribution grid,
and the results obtained are discussed.
016 An Offshore Wind Generation
Scheme With a High-Voltage
Hybrid Generator, HVDC
Interconnections,and
Transmission
IEEE 2016
A new offshore high-voltage dc (HVDC) wind
generation scheme is proposed in this paper. The
scheme implements a high-voltage hybrid generator
(HG) as well as HVDC interconnection and
transmission systems. The turbine power train of the
Proposed system is compared with a typical system
installed in a commercial wind farm. The analyses
demonstrate improvements in system losses and,
hence, efficiency, power-train hardware, including
Cable system mass and, importantly, a reduction in
major component count and installed power
electronics in the nacelle and turbine tower, features
that lead to reduced capital cost and maintenance. The
resulting power conversion system is more simplified
and more amenable to higher voltage implementation
Since it is not constrained by existing state-of-art
power-electronic voltage–source converter structures.
Voltage control is facilitated via dc/dc converters
located away from the turbine tower. To demonstrate
the HG operational concept, measured results from
a low-power laboratory prototype HG system are
compared with analytical results and show good
agreement.
017 Grid-Connected PV-Wind
Battery based Multi-Input
Transformer Coupled
Bidirectional DC-DC Converter
for household Applications
IEEE 2016
In this paper, a control strategy for power flow
Management of a grid-connected hybrid PV-wind-
battery based system with an efficient multi-input
transformer coupled bidirectional dc-dc converter is
presented. The proposed system aims to satisfy the
load demand, manage the power flow from different
sources, inject surplus power into the grid and charge
the battery from grid as and when required. A
transformer coupled boost half-bridge converter is
used to harness power from wind, while bidirectional
buck-boost converter is used to harness power from
PV along with battery charging/discharging control. A
single-phase full-bridge bidirectional converter is used
For feeding ac loads and interaction with grid. The
proposed converter architecture has reduced number
of power conversion stages with less component count,
and reduced losses compared to existing grid
connected hybrid systems. This improves the
Efficiency and reliability of the system. Simulation
results obtained using MATLAB/Simulink show the
performance of the proposed control strategy for
power flow management under various modes
Of operation. The effectiveness of the topology and
efficacy ofthe proposed control strategy are validated
through detailed experimental studies, to demonstrate
the capability of the system
Operation in different modes.
018 Design and Real-Time
Controller Implementation for a
Battery-Ultracapacitor Hybrid
Energy Storage System
IEEE 2016
In this work, two real-time energy management
strategies have been investigated for optimal current
split between batteries and ultra capacitors (UCs) in
electric vehicle (EV) applications. In the first strategy,
an optimization problem is formulated and solved
using Karush-Kuhn-Tucker (KKT) conditions to
obtain the real-time operation points of current split
for the hybrid energy storage system (HESS). In the
second strategy, a neural network based strategy is
implemented as an intelligent controller for the
proposed system. To evaluate the performance of these
two real-time strategies, a performance metric based
on the battery state-of-health (SoH) is developed to
reveal the relative impact of instantaneous battery
currents on the battery degradation. A 38V-385Wh
battery and a 32V-4.12Wh UC HESS hardware
prototype has been developed and a real-time
experimental platform has been built for energy
management controller validation, using xPC Target
and National Instrument data acquisition system
(DAQ). Both the simulation and real-time experiment
results have successfully validated the real-time
implementation feasibility and effectiveness of the two
real-time controller designs. It is shown that under a
high speed, high acceleration, aggressive drive cycle
US06, the two real-time energy management strategies
can greatly reduce the battery peak current and
consequently decreases the battery SoH reduction by
31% and 38% in comparison to a battery-only energy
storage system.
019 Control and Implementation of
a Standalone Solar Photo-
Voltaic Hybrid System
IEEE 2016
A control algorithm for a standalone solar
photovoltaic (PV)-diesel-battery hybrid system is
implemented in this paper. The proposed system deals
with the intermittent nature of the energy generated
by the PV array and it also provides power quality
improvement. The PV array is integrated through a
DC-DC boost converter and controlled using a
maximum power point tracking (MPPT) algorithm to
obtain the maximum power under varying operating
conditions. The battery energy storage system (BESS)
is integrated to the diesel engine generator (DG) set for
the coordinated load management and power flow
within the system. The admittance based control
algorithm is used for load balancing, harmonics
elimination and reactive power compensation under
three phase four-wire linear and nonlinear loads. A
four-leg voltage source converter (VSC) with BESS
also provides neutral current compensation. The
performance of proposed standalone hybrid system is
studied under different loading co
020 Ultracapacitor-Battery Hybrid
Energy Storage System Based on
the Asymmetric Bidirectional
Z-Source Topology for EV
IEEE 2016
This paper proposes an ultra capacitor (UC)-battery
Hybrid energy storage system (HESS) for electric
vehicle based on asymmetric bidirectional Z-source
topology. Compared with the conventional two-stage
design, the HESS can be incorporated into the traction
inverter system, leading to better performance and
Lower cost. The UC energy can be effectively utilized
due to the buck/boost characteristic in the Z-source
converter; meanwhile, the battery converter gets
eliminated in this case. The assumption about the
symmetry in the Z-source topology impendence
network states for the conventional analysis no longer
applies to the proposed HESS configuration. The
asymmetric characteristic related with the uneven
power distribution of UCs and battery is
mathematically excavated in detail. The frequency
dividing coordinated control is proposed to exploit the
advantages of UCs and battery. The battery peak
current estimation is then investigated. Finally,
The steady performance and transient response in
both traction and regenerative modes are verified by
simulation and experimental results.
021 Development of DC/DC
Converter for Battery Energy
Storage Supporting Railway
DC Feeder Systems
IEEE 2016
This paper describes the development of a bilateral
DC/DC converter rated at 1500 V with a peak
power of 500 kW for battery energy storage systems
Supporting railway DC feeder systems. The DC/DC
Converter converts regenerated power from a braking
train and charges the batteries. The DC/DC converter
discharges the stored energy to feed the train during
powering. The converter main circuit and the control
system are described, and successful test results
obtained at the factory are reported. For the main
circuit test, a special test method was applied. For the
control system test, a real-time digital simulator was
used for hardware-in-loop tests. In addition to the
converter tests, the results from DC feeder system
tests with an actual rectifier and battery bank are also
Presented.
022 High Efficiency Bi-Directional
Converter for Flywheel Energy
Storage Application
IEEE 2016
A bidirectional converter (BDC) is essential in
applications where energy storage devices are
involved. Such applications include transportation,
battery less UPS, Flywheel Energy Storage (FES)
systems etc. Bidirectional power flow through buck
and boost mode operation along with high power
Density and efficiency are important requirements of
such systems. This paper presents a new BDC topology
using a combination of fast turn off SCR and IGBT
with a novel control logic implementation to achieve
zero switching losses through Zero Voltage Transition
(ZVT) and Zero Current Transition (ZCT) techniques.
The proposed scheme ensures Zero Switching
Power Loss (ZSPL) for both buck and boost modes of
operation of the BDC. The scheme is simple and
achieves ZSPL during both turn-on and turn-off of the
devices resulting in improved efficiency and reduced
EMI problems. The basic principle of operation,
analysis, and design procedure are presented for both
Voltage buck and boost modes of operation of the
proposed BDC topology. A design example is
presented. Limitations of the system are highlighted.
Experimental and simulation results obtained on a
4kW, 340V input prototype with a switching frequency
of 15.4 kHz are presented to verify the design.
023 Series-Parallel Connection of
Low-Voltage Sources for
Integration of Galvanically
Isolated Energy Storage Systems
This work explores the Series-Parallel Connection of a
Low Voltage Super capacitor Module to obtain Hybrid
Energy Storage System for grid support applications.
The Hybrid System is formed by the Super capacitor
IEEE 2016
Module itself, intended to ensure fast performance
upon peak power requirements, together with a
battery that provides the energy requirements. In the
full system, the front end converter and the load
interfacing converter share a common DC link. The
battery is connected to the DC link by means of a Full-
Bridge Current- Source bidirectional DC-DC
converter. The Super capacitor Module is connected to
the system using a Series-Parallel Configuration,
which overcomes the main problems that arise with
the most common topologies found in the literature.
The full
Operation of the system has been demonstrated
theoretically and by simulations. A demonstration of
such connection is shown experimentally, in a
converter operating at reduced power levels,
in order to validate the feasibility of
thesystem.Conclusions show how this scheme can be
used in Hybrid Storage Systems
024 An Interleaved Half-Bridge
Three-Port Converter With
Enhanced Power Transfer
Capability Using Three-Leg
Rectifier for Renewable Energy
Applications
IEEE 2016
In this paper, an interleaved half-bridge (IHB) three-
port converter (TPC) is proposed for a renewable
power system. The IHB-TPC is used to interface three
power ports: 1) one source port; 2) one battery port;
and 3) one isolated load port. The proposed IHB-TPC
is derived by integrating two half bridge TPC modules.
A parallel configuration is adopted for the primary
side of the two half-bridge modules, while a parallel–
Series configuration is adopted for the secondary side
of the two modules. The power can be transferred
from the source and the battery to the load within the
whole switching cycle with the proposed IHB-TPC. It
means there are no additional conduction losses caused
by the circulating current or the free-wheeling
operation stage. Hence, the voltage gain can be
extended, and the output filter can be reduced. Zero-
voltage switching is realized for all the four main
switches to reduce the switching losses. Two of
the three ports can be tightly regulated by adopting
pulse width modulation plus phase-shift control, while
the third port is left unregulated to maintain power
balance for the system. The operation principles and
the performances of the proposed converter are
analyzed in detail. The experimental results are
Given to verify the feasibility and the effectiveness of
the proposed converter.
025 Secondary-Side-Regulated Soft-
Switching Full-Bridge Three-
Port Converter Based on
Bridgeless Boost Rectifier and
Bidirectional Converter for
Multiple Energy Interface
IEEE 2016
A systematic method for deriving soft-switching
Three-port converters (TPCs), which can interface
multiple energy, is proposed in this paper. Novel full-
bridge (FB) TPCs featuring single-stage power
conversion, reduced conduction loss, and low voltage
Stress are derived. Two no isolated bidirectional
power ports and one isolated unidirectional load port
are provided by integrating an interleaved
bidirectional Buck/Boost converter and a bridgeless
Boost rectifier via a high-frequency transformer. The
Switching bridges on the primary side are shared;
hence, the number of active switches is reduced.
Primary-side pulse widthmodulation and secondary-
side phase shift control strategy are employed
To provide two control freedoms. Voltage and power
regulations over two of the three power ports are
achieved. Furthermore, the current/voltage ripples on
the primary-side power ports are reduced due to the
interleaving operation. Zero-voltage switching
And zero-current switching are realized for the active
switches and diodes, respectively. A typical FB-TPC
with voltage-double rectifier developed by the
proposed method is analyzed in detail. Operation
principles, control strategy, and characteristics of the
FB-TPC are presented. Experiments have been carried
out to demonstrate the feasibility and effectiveness of
the proposed topology derivation method.
026 Analysis, Design, Modelling and
Control of an Interleaved-Boost
Full-Bridge Three-Port
Converter for Hybrid
Renewable Energy Systems
IEEE 2016
This paper presents the design, modelling and control
of a three-port (TPC) isolated dc-dc converter based
on interleaved-boost-full-bridge with pulse-width-
modulation and phase-shift control for hybrid
renewable energy systems. In the proposed topology,
the switches are driven by phase-shifted PWM signals,
where both phase angle and duty cycle are controlled
variables. The power flow between the two inputs is
Controlled through the duty cycle, whereas the output
voltage can be regulated effectively through the phase-
shift. The primary side MOSFETs can achieve zero-
voltage switching (ZVS) operation without additional
circuitry. Additionally, due to the ac output inductor,
the secondary side diodes can operate under zero
current switching (ZCS) conditions. In this work, the
operation principles of the converter are analyzed and
the critical design considerations are discussed. The
dynamic behavior of the proposed ac inductor based
TPC is investigated by performing state-space
modelling. Moreover, the derived mathematical
Models are validated by simulation and
measurements. In order to verify the validity of the
theoretical analysis, design and power decoupling
control scheme, a prototype is constructed and tested
under the various modes, depending on the availability
of the Renewable energy source and the load
consumption. The experimental results show that the
two decoupled controlvariables achieve effective
regulation of the power flow among the three ports.
027 A Triple Active Bridge DC-DC
Converter Capable of Achieving
Full-Range ZVS
IEEE 2016
In this paper, a triple active bridge converter is
Proposed. The topology is capable of achieving ZVS
across the full load range with wide input voltage while
minimizing heavy load conduction losses to increase
overall efficiency. This topology comprises three full
bridges coupled by a three-winding transformer. At
light load, by adjusting the phase shift between
two input bridges, all switching devices can maintain
ZVS due to a controlled circulating current. At heavy
load, the two input bridges work in parallel to reduce
conduction loss. The operation principles of this
topology are introduced and the ZVS boundaries are
derived. Based on analytical models of power loss, a
200Wlaboratory prototype has been built to verify
theoretical considerations.
028 A Family of Isolated Buck-Boost
Converters Based on Semiactive
Rectifiers for High-Output
Voltage Applications
IEEE 2016
A systematic method for developing isolated buck
boost (IBB) converters is proposed in this paper, and
single-stage power conversion, soft-switching
operation, and high-efficiency performance can be
achieved with the proposed family of converters. On
the basis of a nonisolated two-switch buck-boost
converter, the proposed IBB converters are generated
by replacing the dc buck-cell and boost-cell in the non-
IBB converter with the ac buck-cell and boost-cell,
respectively. Furthermore, a family of semi active
rectifiers (SARs) is proposed to serve as the secondary
Rectification circuit for the IBB converters, which
helps to extend the converter voltage gain and reduce
the voltage stresses on the devices in the rectification
circuit. Hence, the efficiency is improved by employing
a transformer with a smaller turns ratio and reduced
Parasitic parameters, by using low-voltage rating
MOSFETs and diodes with better switching and
conduction performances. A full bridge IBB converter
is proposed and analyzed in detail as an example. The
phase-shift modulation strategy is applied to the
Full-bridge IBB converter to achieve IBB conversion.
Moreover, soft-switching performance of all active
switches and diodes can be achieved over a wide load
and voltage range by the proposed converter and
control strategy. A 380-V-output prototype is
fabricated to verify the effectiveness of the proposed
family of IBB converters, the SARs, and the control
strategies.
029 Flying-Capacitor-Based Hybrid
LLC Converters With Input
Voltage Autobalance Ability for
High Voltage Applications
IEEE 2016
An advanced hybrid LLC series resonant converter
With integrated flying-capacitor cell is proposed in
this paper to enable the high step-down conversion in
the high input voltage applications. The inherent
flying-capacitor branch in the primary side can
effectively halve the primary switch voltage stress
compared with the half-bridge LLC converters. And
the input voltage can be shared equally and
automatically between the two series half-bridge
modules without additional balance circuit or control
strategies due to the built-in flying-capacitor cell.
Moreover, the Inherent soft switching performance
during wide load range that exists in the LLC
converters is still kept to reduce the switching losses,
which ensures the high efficiency. Besides, the
proposed converter can be extended to further
decrease the switch voltage Stress by employing
stacked connection. Finally, 500∼640 V input 48 V-
output 1 kW prototype is built and tested to verify the
effectiveness of the proposed converter. The results
prove that the proposed converter is an excellent
candidate for the high input Voltage and high step-
down dc/dc conversion systems.
030 A DC–DC Converter With High
Voltage Gain and Two Input
Boost Stages
IEEE 2016
A family of nonisolated high-voltage-gain dc–dc
Power electronic converters is proposed. The
suggested topologies can be used as multiport
converters and draw continuous current from two
input sources. They can also draw continuous current
from a single source in an interleaved manner. This
versatility makes them appealing in renewable
applications such as solar farms. The proposed
converters can easily achieve a gain of 20 while
benefiting from a continuous input current. Such a
converter can individually link a PV panel to a 400-V
dc bus. The design and component selection
procedures are presented. A 400-W prototype
Of the proposed converter with Vin = 20 and V out =
400 V has been developed to validate the analytical
results.
031 High Gain DC–DC Converter
Based on the Cockcroft–Walton
Multiplier
IEEE 2016
Recent advancements in renewable energy have
created a need for both high step-up and high-
efficiency dc–dc converters. These needs have typically
been addressed with converters using high-frequency
transformers to achieve the desired gain. The
transformer design, however, is challenging. This
paper presents a high step-up current fed converter
based on the classical Cockcroft–Walton (CW)
multiplier. The capacitor ladder allows for high
voltage gains without a transformer. The cascaded
structure limits the voltage stresses in the converter
stages, even for high gains. Being current-fed, the
converter (unlike traditional CW multipliers) allows
the output voltage to be efficiently controlled. In
Addition, the converter supports multiple input
operation without modifying the topology. This makes
the converter especially suitable for photovoltaic
applications where high gain, high efficiency, small
converter size, and maximum power point tracking
are required. Design equations, a dynamic model, and
possible control algorithms are presented. The
converter operation was verified using digital
simulation and a 450-W prototype converter.
032 A Three-State Switching Boost
Converter Mixed With Magnetic
Coupling and Voltage Multiplier
Techniques for High Gain
Conversion
IEEE 2016
An asymmetrical three-state switching boost
converter, combining the benefits of magnetic coupling
and voltage multiplier techniques, is presented in this
paper. The derivation procedure for the proposed
topology is depicted. The new converter can achieve a
very high-voltage gain and a very low-voltage
Stress on the power devices without high turn ratio
and extreme duty cycles. Thus, the low-voltage-rated
MOSFETs with low resistancerDS (ON) can be
selected to reduce the switching losses and cost.
Moreover, the usage of voltage multiplier technique
not only raises the voltage gain but also offers lossless
passive clamp
Performance, so the voltage spikes across the main
switches are alleviated and the leakage-inductor
energy of the coupled inductors can be recycled. In
addition, the interleaved structure is employed in the
input side, which not only reduces the current stress
through each power switch, but also constrains the
input current ripple. In addition, the reverse-recovery
problem of the diodes is alleviated, and the efficiency
can be further improved. The operating principles
And the steady-state analysis of the presented
converter are discussed in detail. Finally, a prototype
circuit with 400-W nominal rating is implemented in
the laboratory to verify the performance of the
proposed converter.
033 A Low-Volume Hybrid Step-
Down Dc-Dc Converter Based
on the Dual Use of Flying
Capacitor
IEEE 2016
This paper introduces a hybrid step-down dc-dc
converter, targeted for battery powered portable
applications where low-volume implementation is the
key priority. The introduced architecture, combining
switched-capacitor (SC) and inductor based circuits,
requires low-volume for implementation by reducing
the size of the filer inductor by 4 times and the output
capacitor by 2 times. In addition to supporting wide
input-output range for step down voltage conversions,
the introduced architecture demonstrates up to 15 %
power processing efficiency improvement compared to
conventional buck converter and faster dynamic
response. These advantages are obtained by a dual use
of the flying capacitor usually existing in SC
converters. The flying capacitor is used for both
balancing of the front-end stage and reducing voltage
swing/stress of the components. Experimental results
from a 5 V, 25 W, 500 kHz prototype verify
advantages of the introduced converter.
034 A Novel Transformer-less
Interleaved Four-Phase Step-
Down DC Converter With Low
Switch Voltage Stress and
Automatic Uniform Current-
Sharing Characteristics
IEEE 2016
In this paper, we propose a novel transformer-less
direct current (dc) converter that features low switch
voltage stress and automatic uniform current sharing.
An interleaved four-phase voltage divider operating
from a 400 V dc bus is used to achieve a high step-
down conversion ratio with a moderate duty ratio.
Based on the capacitive voltage division, the proposed
converter achieves two major objectives, i.e., increased
voltage conversion ratio, due to energy storage in the
blocking capacitors, and reduced voltage stress of
active switches and diodes. As a result, the proposed
converter permits the use of lower voltage rating
MOSFETs to reduce both switching and conduction
losses, thereby improving the overall efficiency. In
addition, due to the charge balance of the capacitors,
the proposed converter enables automatic uniform
current sharing of the interleaved phases without
adding extra circuitry or complex control methods.
The operation principles and performance analyses of
the proposed converter are presented, and its
Effectiveness is verified by a 500Woutput power
prototype circuit that converts 400 V input voltage
into 24 V output voltage.
035 Morphing Switched-Capacitor
Step-Down DC–DC Converters
with Variable Conversion Ratio
IEEE 2016
High-voltage-gain and wide-input-range DC–DC
Converters are widely used in various electronics and
industrial products such as portable devices,
telecommunication, automotive, and aerospace
systems. The two-stage converter is a widely adopted
architecture for such applications, and it is proven to
have a higher efficiency as compared with that of the
single-stage
Converter. This paper presents a modular-cell-based
morphing switched-capacitor (SC) converter for
application as a front-end converter of the two-stage
converter. The conversion ratio of this converter is
flexible and can be freely extended by increasing more
SC modules. The varying conversion ratio is achieved
through the morphing of the converter’s structure
corresponding to the amplitude of the input voltage.
This converter is light and compact, and is highly
efficient over a very wide range of input voltage and
load conditions. Experimental results show that the
efficiency of a single SC module is higher than 98%.
036 High-Efficiency Coupled-
Inductor-Based Step-Down
Converter
IEEE 2016
This study mainly investigates a high-efficiency single-
input multiple-output (SIMO) step-down converter.
The proposed converter can step down the voltage of a
high-voltage dc bus generated by the rectifier of an ac
utility power to a controllable low-voltage output
terminal and middle-voltage output terminals. In this
study, a coupled-inductor-based SIMO step-down
Converter utilizes two power switches with the
properties of voltage clamping for the middle-voltage
switch, and soft switching for all power switches due to
the appropriate choice of the corresponding device
specifications. As a result, the leakage inductor energy
of the coupled inductor can be recycled, and the
voltage spikes on power switches can be alleviated.
Moreover, the switching losses can be significantly
decreased because of all power switches with
Zero-voltage-switching features. Therefore, the
objectives of high efficiency power conversion, high
step-down ratio, and various output voltage with
different levels can be obtained. The effectiveness
Of the proposed SIMO step-down converter is verified
by experimental results of a converter prototype in
practical applications.
037 Isolated Double Step-down DC-
DC Converter with Improved
ZVS Range and No Transformer
Saturation Problem
IEEE 2016
In this paper, an isolated double step-down DC-DC
converter with high efficiency and high step-down
function is proposed. The proposed converter employs
an additional capacitor in the primary side. Compared
to the conventional full-bridge converters, the
proposed converter has a double step-down feature
with reduced voltage stress at the primary side of the
transformer. Moreover, voltage stress of three
primary side switches reduces to half of the input
voltage and zero voltage switching (ZVS) is naturally
achieved for all switches with lower output capacitor
energy of the switches. Therefore, the proposed
converter requires smaller leakage inductance than
the conventional full-bridge converter. Without adding
complexity to the hardware and control, the proposed
converter inherently prevents transformer saturation
problem caused by the DC component of the
transformer. A 3-kW experimental prototype is
constructed to verify the performance of the proposed
converter.
038 A New Compact and High
Efficiency Resonant Converter
IEEE 2016
This paper explores a new resonant converter which
features compact size, high efficiency, and
compatibility with self-driven synchronous rectifiers.
The proposed resonant converter and the LLC series
resonant converter (LLC-SRC) are in the same three-
element resonant converter category and these two
converters both consist of 2 inductors and one
capacitor in their resonant tanks. While the LLC-SRC
converter has all of its resonant elements on the input
side, the proposed resonant converter has one of its
resonant inductors on the output side. Utilizing the
output resonant inductor allows the proposed resonant
converter to implement self-driven synchronous
rectifiers. When comparing the series resonant
inductor in the LLC-SRC, the output inductor in the
proposed resonant converter generally has lower cost
and smaller size in voltage step down applications.
Operational analysis of the proposed resonant
converter is made through sinusoidal approximation.
A 250W prototype of the proposed resonant converter
is built to verify the analysis made in this paper and
evaluate its performance. With the same soft-switching
characteristics as the LLC-SRC has, the proposed
resonant converter can achieve 95.7% efficiency in a
430V to 27.5V/9A conversion even with diode
rectifiers.
039 A Sensitivity-Improved PFM
LLC Resonant Full-Bridge DC-
DC Converter with LC Anti-
Resonant Circuitry
IEEE 2016
An LLC resonant circuit-based full-bridge dc-dc
converter with an LC anti-resonant tank for
improving the performance of pulse-frequency-
modulation (PFM) is proposed in this paper. The
proposed resonant dc-dc converter, named as LLC-LC
converter can extend a voltage regulation area below
the unity gain with a smaller frequency variation
ofPFM by the effect of the anti-resonant tank. This
advantageous property contributes for protecting
over-current in the case of The short-circuit load
condition as well as the start-up interval in the
designed band of switching frequency. The circuit
topology and operating principle of the proposed
converter is described, after which the design
procedure of the operating frequency and circuit
parameters is presented. The performances on the soft
switching and the steady-state PFM characteristics of
the LLC-LC converter are evaluated under the open-
loop control in experiment of a 2.5kW prototype, and
its actual efficiency is compared with a LLC converter
prototype. For revealing
the effectiveness of the LLC-LC resonant circuitry,
voltages and currents of the series and anti-resonant
tanks are analyzed respectively with state-plane
trajectories based on calculation and experiment,
whereby the power and energy of each resonant tank
are demonstrated. Finally, the feasibility of the
proposed converter is evaluated from the practical
point of view.
040 High-Efficiency LLC Resonant
Converter With High Voltage
Gain Using an Auxiliary LC
Resonant Circuit
To design an LLC resonant converter optimally in the
wide input voltage range, the LLC resonant converter
with high efficiency and high voltage gain using an
auxiliary LC resonant circuit is proposed. In this
paper, the auxiliary LC resonant circuit operates as a
variable inductor according to the change of the
switching frequency, and it is presented as an effective
magnetizing inductance. In the nominal state, since the
effective magnetizing inductance increases, the
primary circulating current is decreased. Thus, the
turn-off switching loss of the primary switches and the
Primary conduction loss are minimized. During the
hold-up time, the effective magnetizing inductance
IEEE 2016 decreases so that the proposed converter has a high
voltage gain. As a result, an optimal design of the LLC
resonant converter over the wide input voltage range
is possible. The proposed converter is verified by
experimental results with a 330–390 V input and 350
W (56 V/6.25 A) output prototype.
041 Hybrid Bridgeless DCM SEPIC
Rectifier Integrated with a
Modified Switched Capacitor
Cell
IEEE 2016
In this paper is proposed a novel single-phase PWM
bridgeless rectifier, based on SEPIC converter
topology, integrated with a modified switched
capacitor cell. The structure has the absence of the
diode bridge at the input port reducing the number of
components and conduction losses. Besides, it has the
Presence of a switched capacitor cell, providing double
gain at the output voltage. A comparison with the
conventional SEPIC shows that the proposed
converter has lower voltage stress on the
Semiconductors when both converters are designed for
the same output voltage, and the same voltage stress
across the semiconductors when the output voltage of
the proposed converter is twice bigger than the
conventional SEPIC. Therefore, the proposed
structure can be applied in DCM SEPIC rectifiers
improving the converter static gain, making it suitable
For higher voltage applications. The paper also
proposes a modified switched capacitor cell, which
does not change the storage capacitor operation mode
of the SEPIC rectifier. To validate the theoretical
analyses a prototype of 500 W was built considering an
input and an output voltage of 220 V and 400 V,
Respectively, and a switching frequency of 50 kHz.
042 Multi-input Step-Up Converters
Based on the Switched-Diode-
Capacitor Voltage Accumulator
IEEE 2016
This paper introduces the application of switched
diode- capacitor voltage accumulator (SDCVA) on
conventional boost converter. This study aims to
obtain two different kinds ofmulti-input step-up
converters with high voltage gains, low component
Stresses, low ripples, simple control, and high
conversion efficiencies: one is based on the parallel
SDCVA and the other based on the serial SDCVA. The
double-input step-up converter based on the parallel
SDCVA and the double-input step-up converter
Based on the serial SDCVA are, respectively, taken as
an example to do theoretical analysis, including
operating principles and performance analyses when
they work individually and simultaneously. The two
proposed converters are implemented with a voltage
closed-loop control at the switching frequency of 30
kHz. Experimental results obtained from the
implemented prototypes are provided to validate the
feasibility and effectiveness of the proposed converters.
043 Split-Phase Control: Achieving
Complete Soft-Charging
Operation of a Dickson
Switched-Capacitor Converter
IEEE 2016
Switched-capacitor (SC) converters are gaining
popularity due to their high power density and
suitability for on-chip integration. Soft-charging and
resonant techniques can be used to eliminate the
current transient during the switching instances, and
Improve the power density and efficiency of SC
converters. In this paper, we propose a split-phase
control scheme that enables the Dickson converter to
achieve complete soft-charging (or resonant)
operation, which is not possible using the conventional
two-phase control. An analytical method is extended to
help in the analysis and design of split-phase
controlled Dickson converters. The proposed
technique and analysis are verified by both simulation
and experimental results. An 8-to-1 step-down Dickson
converter with an input voltage of 150 V and rated
power of 36 W is built using GaN FETs. The converter
prototype demonstrated a fivefold reduction in the
output impedance (which corresponds to conduction
Power loss) compared to a conventional Dickson
converter, as a result of the split-phase controlled soft-
charging operation.
044 A Bridgeless Totem-pole
Interleaved PFC Converter for
Plug-In Electric Vehicles
IEEE 2016
This paper proposes a bidirectional bridgeless totem-
pole interleaved power-factor-correction (PFC)
converter using SiC MOSFETs as the front-end stage
of an onboard charger for plug-in electric vehicles
(PEVs). The proposed converter provides bidirectional
operation enabling both grid-to-vehicle (G2V)
charging and vehicle-to-grid (V2G)Ancillary services.
The converter is suitable for efficient G2V V2G
onboard charging due to its superiorities in terms of
bidirectional operation, smaller current ripple, lower
EMI, lower conduction losses and switching losses. A
3.3kW PFC converter is designed and developed, using
Silicon-Carbide MOSFETs with fast recovery body
diodes, for validation of and V2G operating modes.
Utilizing SiC MOSFETs enables continuous current
mode (CCM) operation of the totem-pole PFC
converter in high-power applications. The converter is
capable of converting 85Vac-265Vac line voltages into
a Regulated dc voltage in the range of 300V to 600V.
The Maximum efficiency of converter reaches up to
99.2% with 0.99 power factor.
045 Full-Range Soft-Switching-
Isolated Buck-Boost Converters
With Integrated Interleaved
Boost Converter and Phase-
Shifted Control
IEEE 2016
A new method for deriving isolated buck-boost (IBB)
Converter with single-stage power conversion is
proposed in this paper and novel IBB converters based
on high-frequency bridgeless interleaved boost
rectifiers are presented. The semiconductors,
conduction losses, and switching losses are reduced
significantly by integrating the interleaved boost
converters into the full-bridge diode-rectifier. Various
high-frequency bridgeless boost rectifiers
Are harvested based on different types of interleaved
boost converters, including the conventional boost
converter and high step-up boost converters with
voltage multiplier and coupled inductor. The
Full-bridge IBB converter with voltage multiplier is
analyzed in detail. The voltage multiplier helps to
enhance the voltage gain and reduce the voltage
stresses of the semiconductors in the rectification
circuit. Hence, a transformer with reduced turns ratio
and parasitic parameters, and low-voltage
ratedMOSFETs and diodes with better switching and
conduction performances can be applied to improve
the efficiency. Moreover, optimized phase-shift
modulation strategy is applied to the full-bridge IBB
converter to achieve isolated buck and boost
conversion. What’s more, soft-switching performance
of all of the active switches and diodes within the
Whole operating range is achieved. A 380-V output
prototype is fabricated to verify the effectiveness of the
proposed IBB converters and its control strategies.
046 A PWM Plus Phase-Shift
Controlled Interleaved Isolated
Boost Converter Based on
Semiactive Quadrupler Rectifier
for High Step-Up Applications
IEEE 2016
Semi active quadruple rectifiers (SAQRs) are
proposed in this paper to serve as the secondary
rectification circuits, which make the secondary-side
voltages to be controllable and help reduce current
stress and conduction losses. An interleaved isolated
boost converter is developed based on the proposed
SAQRs. By utilizing the pulse-width modulation
(PWM) plus phase-shift (PPS) control strategy, the
primary- and secondary-side voltages are well
matched to reduce the current values and circulating
Conduction losses. With the proposed SAQRs, the
voltage gain is extended and the voltage stresses on
power devices and passive components used in
rectification circuits are reduced to the half of the high
output voltage. Hence, the efficiency is improved by
using a transformer with a smaller turn’s ratio and
reduced parasitic parameters, and by employing low-
voltage rating devices with better switching and
conduction performance. With optimal design, lower
voltage, and current stresses on the primary-side
switches, minimized input current ripple can
Be realized. Moreover, the zero-voltage turn on
switching of the active switches and the zero-current
turn off switching of the diodes can be achieved over a
wide load and voltage range by the proposed SAQR-
based converter and the control strategy. Meanwhile,
the higher voltage gain, the lower voltage, and the
current stresses on power devices can be obtained with
the proposed SAQR-based converter compared
with passive quadruple rectifier-based converter.
The feasibility and effectiveness of the proposed
SAQRs and the derived converter are verified by a
380-V output prototype.
047 A Power Quality Improved
Bridgeless Converter Based
Computer Power Supply
IEEE 2016
Poor power quality, slow dynamic response, high
device stress, harmonic rich, periodically dense, peaky,
distorted input current are the major problems which
are frequently encountered in conventional switched
mode power supplies (SMPSs) used in computers. To
mitigate these problems, it is proposed here to use a
non-isolated bridgeless buck-boost single ended
primary inductance converter (SEPIC) in
discontinuous conduction mode (DCM) at the front
end of an SMPS. The bridgeless SEPIC at the front
end provides stiffly regulated output dc voltage even
under frequent input voltage and load variations. The
output of the front end converter is connected to a half
bridge dc-dc converter for isolation and also for
obtaining different dc voltage levels at the load end
that are needed in a personal computer. Controlling a
single output voltage is able to regulate all the other dc
output voltages as well. The design and simulation of
the proposed power supply are carried out for
obtaining an improved power quality which is verified
through the experimental results.
048 Design and Implementation of a
High Efficiency Multiple Output
Multiple output converters (MOCs) are widely applied
to applications requiring various levels of output
Charger based on the Time
Division Multiple Control
Technique
IEEE 2016
voltages due to their advantages in terms of cost,
volume, and efficiency. However, most of the
conventional MOCs cannot regulate multiple outputs
tightly and they can barely avoid the cross regulation
problem. In this paper, the recently developed Time
Division Multiple Control (TDMC) method, which can
regulate all of the outputs with a high accuracy, is used
for a multiple output battery charger based on the
phase shift full bridge topology to simultaneously
charge three batteries. The proposed charger is able to
charge three different kinds of batteries or three of the
same kind of battery in different state of charges
(SOCs) independently and accurately with the
constant current/constant voltage (CC/CV) charge
method. As a result, the strict ripple specification of a
battery can be satisfied for multiple battery charges
without difficulty. In addition, the proposed charger
exhibits a high efficiency since the soft switching of all
of the switches during the entire charge process can be
guaranteed. The operating principle of the converter
and the design of the controller, including the state-
space average modeling, will be detailed and the
validity of the proposed method is verified through
experiments.
049 Single-Stage AC/DC Single-
Inductor Multiple-Output LED
Drivers
2015 Various ac/dc LED driver topologies have been
proposed to meet the challenges of achieving a
compact, efficient, low-cost, and robust multistring
LED lighting system. These LED drivers typically
employ a two-stage topology to realize the functions
Of ac/dc rectification and independent current control
of each LED string. The choice of having two stage
conversions involves additional hardware components
and a more complicated controller design process.
Such two-stage topologies suffer from a higher system
Cost, increased power loss, and large form factor. In
this paper, a single-stage ac/dc single-inductor
multiple-output LED driver is proposed. It uses only
one single inductor and N + 1 active power switches (N
being the number of LED strings) with reduced
Component count and smaller form factor. The
proposed driver can achieve both functions of ac/dc
rectification with a high power factor and precise
independent current control of each individual
LED string simultaneously. A prototype of an arc/dc
single-inductor triple-output LED driver is
constructed for verification. Experimental
Results corroborate that precise and independent
current regulation of each individual LED string is
achievable with the proposed driver. A power factor of
above 0.99 and a peak efficiency of 89% at 30-W rated
output power are attainable.
050 A Wide Load Range ZVS Push-
Pull DC/DC Converter with
Active-Clamped
IEEE 2016
A new active-clamped zero-voltage-switching (ZVS)
push-pull converter is proposed in this paper.
Compared with the conventional push-pull converter,
one auxiliary switch Q3
and a clamping capacitor Ca
is
added in the primary side of the transformer to recycle
the energy stored in the leakage inductors and clamp
the voltage spike. Owing to the proposed converter
which maintains ZVS of all the three switches from
full load to very light load condition, switching losses
are reduced significantly. The voltage stresses on
switches that can be clamped at the input voltage plus
the clamping capacitor voltage i.e., Vin
+VCa
, are much
less than those of a conventional push-pull converter
that enabling the use of low-voltage, low-performance
and lower cost devices. In addition, the proposed
topology can eliminate the problems of flux-imbalance
existing in the conventional one. Detailed operation,
analysis, design, comparative study and experimental
results for the proposed converter are presented in this
paper. An 800 W prototype was developed in the
laboratory to evaluate and demonstrate the validity of
the converter.
051 A ZVS Pulsewidth Modulation
Full-Bridge Converter With a
Low-RMS-Current Resonant
Auxiliary Circuit
IEEE 2016
This paper presents the description and analysis of
a phase-shift-modulated full-bridge converter with a
novel robust passive low-rms-current resonant
auxiliary circuit for zero-voltage
Switching (ZVS) operation of both the leading and
lagging switch legs. Detailed time-domain analysis
describes the steady-state behavior of the auxiliary
circuit in different operating conditions. An in-depth
comparative study between a fully specified baseline
Converter and the equivalent converter using the
proposed resonant auxiliary circuit is presented. For a
similar peak auxiliary current to ensure ZVS
operation, a minimum of 20% reduction in rms
current is obtained, which decreases the conduction
losses. Key characteristics and design considerations
are also fully discussed. Experimental results from a
750-W prototype confirm the predicted enhancements
using the proposed resonant auxiliary circuit.
052 A ZV-ZCS Electrolytic
Capacitor-LessAC/DC
Isolated LED Driver with
Continous Energy Regulation
IEEE 2016
Conventional AC/DC LED drivers require a large
Energy storage capacitor at the output to provide a
constant current to the LEDs. In order to minimize the
size and cost of the driver circuit, electrolytic
capacitors are conventionally used due to its high
energy density and low cost. However, electrolytic
Capacitors are sensitive to operating temperature and
have much shorter lifetime than the LED
semiconductor devices, which significantly reduces the
overall life time of the LED system. Another drawback
with the current LED drivers is that the presence of
the switching power losses restricts the use of high
Frequency operation, which results in using bulky
passive circuit components in the drivers and
significantly reduces the circuit power efficiency. This
paper proposes a single-stage high power factor LED
driver with almost zero switching losses and without
The electrolytic capacitor. In the proposed circuit,
discontinuous conduction mode (DCM) boost
converter was utilized as a power factor correction
(PFC) circuit, where it was integrated with an
Asymmetrical pulse width modulated (APWM) series
resonant converter to form a single stage power
conversion unit to drive the LEDs. The proposed
circuit is able to achieve zero turn-on and turn-off
switching operation and is able to eliminate the
Conventionally needed electrolytic capacitors by
continuously regulating the DC-link voltage. The
proposed LED driver was simulated and tested on a
12W design example to confirm that an almost unity
power factor and an efficiency of 95% can be achieved
053 Wide ZVS Range Asymmetric
Half-Bridge Converter With
Clamp Switch and Diode
for High Conversion Efficiency
A conventional asymmetrical half-bridge
(AHB) converter is widely used for dc–dc stage in low-
to medium power system. However, since the
asymmetric operation of AHB converter causes the
low efficiency over entire load condition, the
conventional AHB converter is not usually considered
for the candidate of server power system. In order to
overcome the problems of the conventional AHB
converter, a wide zero-voltage-switching (ZVS) range
AHB converter with a clamp switch and a clamp diode
IEEE 2016 is proposed in this paper. The proposed AHB
converter (PAHBC) replaces a low-side clamp diode
with a MOSFET switch and adds an auxiliary
winding, which changes the transformer turns-ratio.
From these modifications and the pulse width-
modulation (PWM) control of clamp switch, the
PAHBC can be designed optimally at nominal input
condition and obtains additional dc gain at hold-up
time condition. These advantages achieve the high
conversion efficiency over the entire load condition.
The operational principle and analysis of the PAHBC
are presented in this paper and verified by a 340–400
V input and 50 V/500 W output laboratory prototype
054 ZVS-ZCS High Voltage Gain
Integrated Boost Converter For
DC Microgrid
IEEE 2016
A non-isolated soft switched integrated boost
converter having high voltage gain is proposed for the
module integrated PV systems, fuel cells and other low
Voltage energy sources. Here a bidirectional boost
converter is integrated with a resonant voltage
quadrupler cell to obtain higher voltage gain. The
auxiliary switch of the converter, which is connected to
the output port acts as an active clamp circuit. Hence
ZVS (zero voltage switching) turn on of the MOSFET
switches are achieved. Coupled inductor’s leakage
energy is recycled to the output port through this
auxiliary switch. In the proposed converter,
all the diodes of the quadrupler cell are turned off with
ZCS (zero current switching). This considerably
reduces the high frequency turn off losses and reverse
recovery losses of the diodes. ZCS turn off of the
diodes also remove the diode voltage ringing caused
due to the interaction of the parasitic capacitance of
the diodes and the leakage inductance of the coupled
inductor. Hence to protect the diodes from the voltage
spikes, snubbers are not required. The voltage stress
on all the MOSFETs and diodes are lower. This helps
to choose switches of low voltage rating (low
RDS(ON)) and thus improve the efficiency. Design and
mathematical analysis of the proposed converter are
made.A 250W prototype of the converter is built to
verify the
performance
055 A CLCL Resonant DC/DC
Converter for Two-Stage LED
Driver System
A CLCL resonant dc/dc converter has been proposed
and analyzed in this paper for two-stage light-emitting
diode (LED) drivers. The circuit performs zero
voltage-switching (ZVS) turn-on and quasi zero
current- switching (ZCS) turn-off. Then, a two-stage
IEEE 2016 system has been designed using a power factor
correction circuit before the proposed converter.
Optimum input impedance angle, dead time, and
components parameters have been achieved after
thoughtful design, thus obtaining good soft-switching
performance and reduced voltage stress. A 100-W
prototype has been realized and tested demonstrating
Its high feasibility and efficiency at full load and
during dimming operations.
056 A Novel LED Drive System
Based on Matrix Rectifier
IEEE 2016
This paper presents a novel LED drive system based
On matrix rectifier. Matrix rectifier is applied to the
LED drive system for the first time as to our
knowledge. The novel LED drive system is composed
of two stages. The first stage is the matrix rectifier,
and the second stage is the multi-port two transistor
Forward converters (TTFC) that share a leg. The
space
Vector modulation strategy of matrix rectifier and the
modulation strategy of multi-port TTFC matched with
rectifier stage are fully studied. In order to maintain
the stability of output current, current PI closed-loop
control is adopted for LED strings. Both simulation
and experiment are carried out to verify the topology
And modulation strategy of the proposed LED drive
system.
057 Three phase converter with
galvanic isolation based on loss-
free resistors for HB-LED
lighting applications
IEEE 2016
This work presents a driver for High-Brightness
Light-Emitting Diodes (HB-LED) in three-phase grids,
which complies with IEC 1000-3-2 Class C
requirements, achieves high Power Factor (PF), low
Total Harmonic Distortion (THD), as well as, the
capability to achieve full dimming while disposing of
the bulk capacitor and having galvanic isolation. The
HB-LED driver is based on the use of six four-port
cells with their inputs connected to the three-phase
network and their outputs connected in parallel. Each
one of these cells is a DC/DC converter operating as a
Loss-Free Resistor (LFR) based on the concept of a
flyback operating in Discontinuous Conduction Mode
(DCM). Moreover, it operates in the full range of the
European three-phase line voltage, which varies
between 380V and 420V, and it supplies an output
voltage of 48V with maximum power of 90W.
058 A Bidirectional Three-Level
LLC Resonant Converter
With PWAM Control
IEEE 2016
This paper proposes a bidirectional three-level LLC
Resonant converter with a new pulse width and
amplitude modulation control method. With different
control signals, it has three different operation modes
with different voltage gains. Therefore, it can achieve
wide voltage gain range by switching among these
Three modes, which is attractive for energy storage
system applications needing wide voltage variation.
The proposed topology operates with constant
switching frequency, which is easy to implement
With digital control, and it can achieve soft switching
for all the switches and diodes in the circuit as a
conventional LLC resonant converter. The
performance of the proposed converter is validated by
the experimental results from a 1-kW prototype with
20 A maximum output current.
059 A New Family of Zero-Voltage-
Transition Nonisolated
Bidirectional Converters With
Simple Auxiliary Circuit
IEEE 2016
In this paper, a new family of zero-voltage transition
(ZVT) bidirectional converters are introduced.
In the proposed converters, soft-switching condition
for all semiconductor elements is provided regardless
of the power flow direction and without any extra
voltage and current stress on the main switches. The
auxiliary circuit is composed of a coupled inductor
with the converter main inductor and two auxiliary
switches. The auxiliary switches benefit from
significantly reduced voltage stress and without
Requiring floating gate drive circuit. Also, by applying
the synchronous rectification to the auxiliary switches
Body diodes, conduction losses of the auxiliary circuit
are reduced. In the auxiliary circuit, the leakage
inductor is used as the resonant inductor and all the
magnetic components are implemented on a single
core which has resulted in significant reduction of the
converter volume. In the proposed converters, the
reverse recovery losses of the converter-rectifying
diodes are completely eliminated and hence, using the
low-speed body diode of the power switch as the
converter-rectifying diode is feasible. The theoretical
analysis for a bidirectional buck and boost converter is
Presented in detail and the validity of the theoretical
analysis is justified using the experimental results of a
250-W prototype converter.
060 Bidirectional Resonant DC–DC
Step-Up Converters for Driving
High-Voltage Actuators in
Mobile Microrobots
Electro active polymer (EAP) actuators have been
investigated to convert electrical energy
intomechanical deformation in autonomous
microrobots. The use of dielectric EAP actuators
IEEE 2016
comes with several challenges to address requirements
such as high excitation voltages, explicit driving
signals, and low conversion efficiency. External bulky
and heavy power sources are used to generate and
provide required excitation voltages. The development
Of a miniature, high voltage gain, and highly efficient
power electronic interface is required to overcome
such challenges and enable autonomous operation of
miniature robots. In this paper, a bidirectional single-
stage resonant dc–dc step-up converter is introduced
and developed to efficiently drive high-voltage EAP
actuators in mobile microrobots. The converter utilizes
resonant capacitors and a coupled inductor as a soft-
switched LC network to step up low input voltage.
High-frequency soft-switching operation owing to LC
resonance allows small footprint of the circuit without
suffering from switching losses, which in turn
increases the efficiency. The circuit is capable of
generating explicit high-voltage actuation signals, with
capability of recovering unused energy from
EAP actuators. A 4-mm × 8-mm, 100-mg, and 600-
mW prototype has been designed and fabricated to
drive an in-plane gap-closing electrostatic inchworm
motor. Experimental validations have been carried out
to verify the circuit’s ability to step up voltage from 2
To 100 V and generate two 1-kHz, 100-V driving
voltages at 2-nF capacitive loads.
061 Bidirectional Single Power-
Conversion DC-AC Converter
with Non-Complementary
Active-Clamp Circuits
IEEE 2016
This paper presents a bidirectional single power-
conversion dc-ac converter with non-complementary
Active-clamp circuits. The proposed converter
comprises a bidirectional flyback converter and an
unfolding bridge. In order to interface the grid with a
low voltage energy storage through only single power-
conversion, the bidirectional flyback converter
transforms the low voltage directly into the folded grid
voltage and regulates the folded grid current. The
proposed converter adopts noncomplementary
operation strategy for the active-clamp circuits. By
using this strategy, the bidrectional flyback converter
not only avoids the voltage spike but also minimizes
the power losses by the circulating energy. Thus,
with single power-conversion and non-complementary
active-clamp circuits, the proposed converter obtains
high power efficiency. To facilitate the bidirectional
single power-conversion, a novel control algorithm is
developed. With this control algorithm, the proposed
converter ensures high grid power quality and
seamless mode transition .The proposed bidirectional
dc-ac converter is theoretically analyzed in detail. The
experimental results based on a 250W prototype are
provided to evaluate its performance
062 High Step-Up/Step-Down Soft-
Switching Bidirectional DC–DC
Converter With Coupled-
Inductor and Voltage Matching
Control for Energy Storage
Systems
IEEE 2016
A soft-switching bidirectional dc–dc converter (BDC)
with a coupled-inductor and a voltage doubler cell
Is proposed for high step-up/step-down voltage
conversion applications. A dual-active half-bridge
(DAHB) converter is integrated into a conventional
buck-boost BDC to extend the voltage gain
dramatically and decrease switch voltage stresses
effectively. The coupled inductor operates not
only as a filter inductor of the buck-boost BDC, but
also as a transformer of the DAHB converter. The
input voltage of the DAHB converter is shared with
the output of the buck-boost BDC. So, PWM control
can be adopted to the buck-boost BDC to ensure that
the voltage on the two sides of the DAHB converter is
always matched. As a result, the circulating current
and conduction losses can be lowered to improve
efficiency. Phase-shift control is adopted to the DAHB
converter to regulate the power flows of the proposed
BDC. Moreover, zero-voltage switching (ZVS) is
achieved for all the active switches to reduce the
switching losses. The operational principles and
characteristics of the proposed BDC are presented in
detail. The analysis and performance have been fully
validated experimentally on a 40–60 V/400 V 1-kW
hardware prototype.
063 A BIDIRECTIONAL SINGLE-
STAGE THREEPHASE
RECTIFIER WITH HIGH-
FREQUENCY
ISOLATION AND POWER
FACTOR
CORRECTION
IEEE 2016
This paper proposes a single-stage three-phase
rectifier with high-frequency isolation, power factor
correction, and bidirectional power flow. The
presented topology is adequate for dc grids (or smart-
grids), telecommunications (telecom) power supplies,
and more recent applications such as electric vehicles.
The converter is based on the three-phase version of
the dual active bridge (DAB) associated with the three-
stateswitching cell (3SSC), whose power flow between
the primary and secondary sides is controlled by the
phase-shift angle. A theoretical analysis is presented
and validated through simulation and experimental.
064 A High-Voltage SiC-Based Boost
PFC for LED Applications
This paper reports a single-stage grid-supplied boost
converter with power factor correction for light-
emitting diode (LED)-applications using Silicon-
Carbide (SiC) and operating at the boundary between
IEEE 2016
continuous and discontinuous conduction modes to
reduce switching losses. The converter is supplied by
a 230 VRMS grid voltage, and attains 1200-V dc at the
output port, where a-spot of 320 LEDs connected in
series is supplied at constant current. The sliding-
mode control theory is employed to analyze the
switching regulator dynamics, assuring the system
stability. The controller is easily implemented by
means of a hysteretic comparator avoiding the risk of
modulator saturation. The converter can operate in a
normal mode, in which all the input current semicycles
are employed, and in a burst mode where only
a fraction of all the current semicycles is used. The
power switch is realized with silicon carbide (SiC)
devices to improve the performance of low-power -grid
-supplied LED-based lighting systems. The
experimental results are in perfect agreement with the
theoretical predictions and demonstrate the feasibility
of the proposed approach.
065 Bumpless Control for Reduced
THD in Power Factor
Correction Circuits
2015 It is well known that power factor correction (PFC)
circuits suffer from two fundamentally different
operating modes over a given AC input cycle. These
two modes, continuous conduction mode (CCM) and
discontinuous conduction mode (DCM), have very
different frequency-response characteristics that can
make control design for PFC circuits challenging. The
problem is exacerbated by attempts to improve
efficiency by dynamically adjusting the PWM
switching frequency based on the load. Adjusting the
PWM frequency based on the load limits controller
bandwidth and restricts dynamic performance. Prior
work has made use of multiple controllers, however,
they have not addressed the discontinuity (bump) that
exists when switching between controllers. In this
paper, bumpless controllers will be synthesized for a
750 watt, semi-bridgeless PFC for the CCMDCM
operating modes.
066 Control of a Single-Stage Three-
Phase Boost Power Factor
Correction Rectifier
Advances in power electronics are enabling More
Electric Aircrafts (MEAs) to replace pneumatic
systems with electrical systems. Active power factor
correction (PFC) rectifiers are used in MEAs to rectify
the output voltage of the three-phase AC-DC boost
converter, while maintaining a unity input power
factor. Many existing control strategies implement
PI compensators, with slow response times, in their
IEEE 2016
voltage and current loops. Alternatively,
computationally expensive nonlinear controllers can
be chosen to generate input currents with high power
factor and low total harmonic distortion (THD), but
they may need to be operated at high switching
frequencies due to relatively slower execution of
control loop. In this work, a novel control strategy is
proposed for a three-phase, singlestage boost-type
rectifier that is capable of tight and fast regulation of
the output voltage, while simultaneously achieving
unity input power factor, without constraining the
operating switching frequency. The proposed control
strategy is implemented, using one voltage-loop PI
controller and a linearized transfer function of duty-
ratio to input current, for inner loop current control.
A 1.5 kW three-phase boost PFC prototype is designed
and developed to validate the proposed control
algorithm. The experimental results show that an
input power factor of 0.992 and a tightly regulated DC
link voltage with 3% ripple can be achieved.
067 Interleaved Digital Power Factor
Correction Based on the Sliding-
Mode Approach
IEEE 2016
This study describes a digitally controlled power
factor correction (PFC) system based on two
interleaved boost converters operating with pulsewidth
modulation (PWM). Both converters are
independently controlled by an inner control loop
Based on a discrete-time sliding-mode (SM) approach
that imposes loss-free resistor (LFR) behavior on each
cell. The switching surface implements an average
current-mode controller so that the power factor (PF)
is high. The SM-based digital controller is designed
to operate at a constant switching frequency so that
the interleaving technique, which is recommended for
ac–dc powerconversion systems higher than 1 kW, can
be readily applied. Anouter loop regulates the output
voltage by means of a discrete-time proportional–
integral (PI) compensator directly obtained from a
discrete-time small-signal model of the ideal sliding
dynamics. The control law proposed has been
validated using numerical simulation and
experimental results in a 2-kW prototype.
068 LCL Filter Design for Three-
phase Two-level Power
Factor Correction using Line
Impedance Stabilization
Network
This paper presents LCL filter design method for
three-phase two-level power factor correction (PFC)
using line impedance stabilization network (LISN). A
straightforward LCL filter design along with variation
in grid impedance is not simply achievable and
inevitably lead to an iterative solution for filter.
IEEE 2016
By introducing of fast power switches for PFC
applications such as silicon-carbide, major current
harmonics around the switching frequency drops in
the region that LISN can actively provide well-defined
impedance for measuring the harmonics (i.e. 9 kHz-
30MHz). Therefore, LISN can be replaced with
unknown grid impedance at high frequency, simplify
the model of the filter, and provide repetitive
measurements. In this paper, all the filter parameters
are derived with analyzing the behavior of the
converter at high frequency with presence of LISN
impedance. The minimum required filter capacitor is
derived using the current ripple behavior of converter-
side inductor. The grid-side inductor is achieved as a
function of LISN impedance to fulfill the grid
regulation. To verify the analyses, an LCL filter is
designed for a 5 kW SiC-based PFC. The simulation
and experimental results support the validity of the
method.
069 New AC–DC Power Factor
Correction Architecture
Suitable for High-Frequency
Operation
IEEE 2016
This paper presents a novel ac–dc power factor
correction (PFC) power conversion architecture for a
singlephase grid interface. The proposed architecture
has significant advantages for achieving high
efficiency, good power factor, and converter
miniaturization, especially in low-to-medium power
applications. The architecture enables twice-line-
frequency energy to be buffered at high voltage with a
large voltage swing, enabling reduction in the energy
buffer capacitor size and the elimination of electrolytic
capacitors. While this architecture can be beneficial
With a variety of converter topologies, it is especially
suited for the system miniaturization by enabling
designs that operate at high frequency (HF, 3–30
MHz). Moreover, we introduce circuit
implementations that provide efficient operation in
this range. The proposed approach is demonstrated
for an LED driver converter operating at a (variable)
HF switching frequency (3–10 MHz) from 120 Vac ,
and supplying a 35Vdc output at up to 30 W. The
prototype converter achieves high efficiency (92%)
and power factor (0.89), and maintains a good
performance over a wide load range. Owing to the
architecture and HF operation, the prototype
achieves a high “box” power density of 50 W/in3
(“displacement” power density of 130 W/in3 ), with
miniaturized inductors, ceramic energy buffer
capacitors, and a small-volume EMI filter.
070 Bridgeless SEPIC PFC
Converter for Low Total
Harmonic Distortion and High
Power Factor
IEEE 2016
There is a need to improve the power quality of the
grid as well as the power factor implied on the grid
due to the nonlinear loads connected to it. A new single
phase bridgeless AC/DC power factor correction
(PFC) topology to improve the power factor as well as
the total harmonic distortion (THD) of the utility grid
is proposed in this research. By eliminating the
input bridge in conventional PFC converters, the
control circuit is simplified; the total harmonics
distortion THD and power factor PF are improved.
The controller operates in multi loop fashion as the
outer control loop calculates the reference current
through innovative filtering and signal processing.
Inner current loop generates PWM switching signals
through the PI controller. Analytical derivation of the
proposed converter is presented in detail. Performance
of the proposed PFC topology is verified for prototype
using PSIM circuit simulations. The experimental
system is developed, and the experimental results
agree with simulation results.
071 Interleaved SEPIC Power
Factor Pre-Regulator Using
Coupled Inductors in
Discontinuous Conduction Mode
with Wide Output Voltage
IEEE 2016
A power factor pre-regulator (PFP) usually serves as
the first stage of an active two-stage AC/DC converters
in a variety of applications including inductive heating
systems, wireless charging systems, and onboard
chargers for plug-in electric vehicles (PEVs).
Conventionally, boost-type PFPs are utilized to
regulate the DC-link voltage at a fixed voltage;
however, a variable DC-link voltage can enhance the
overall efficiency of the converters. In this paper, an
interleaved single-ended primary inductor converter
(SEPIC) with coupled inductors is proposed as the
PFP stage for two-stage AC/DC converters. The
converter is designed to operate in discontinuous
conduction mode (DCM) in order to achieve soft
switching for switches and diodes. The directly
coupled inductors are utilized to reduce the number of
magnetic components and decrease the input current
ripple. A 500W interleaved SEPIC PFP prototype is
designed to verify the benefits of this converter. The
experimental results show that the converter can
maintain high efficiency over a wide range of DC-link
voltage.
072 Reduced Current Stress
Bridgeless Cuk PFC
Converter with New Voltage
Multiplier Circuit
IEEE 2016
In this paper, a bridgeless Cuk derived AC/DC
converter is proposed. The present circuit topology
separates the input PFC current and output voltage-
regulation current, which reduces the switch current
stresses and improves system thermal management
compared to the conventional bridge and bridgeless
Cuk topologies. In addition, the proposed bridgeless
topology has semi-soft switching function of all active
switches to reduce converter switching losses.
Therefore, the switch conduction losses and switching
power losses all can be decreased due to the reduced
current stress and semi-soft switching function. To
understand the proposed Cuk derived converter, the
circuit operation is explained and the steady-state
behavior is analyzed. Finally a prototype system with
DSP TMS320F28335 controller is implemented. Some
simulation and experimental results are offered to
verify the validity of the proposed bridgeless Cuk
derived PFC converter.
073 Single-Stage Bridgeless AC-DC
PFC Converter Using a Lossless
Passive Snubber and Valley-
Switching
IEEE 2016
A single-stag converter using a losslee ss
bripdagsesleivses sAnCub-DbCer PaFnCd
valley-switching is proposed. The proposed converter
is Ibna stehde opnr oap towsoe-ds tacgoen
vberridtegre, letshse bcooonsdt-ufclytbioanc kl
ocsosnevse rtaerre. reduced by removing an input full-
bridge diode rectifier. The boost inductor is designed
to be operated in the discontinuous- conduction mode
for achieving high power factor. In the flyback
module, the couple inductor that provides input-
output electrical isolation for safety is designed to be
operated in the critical- conduction mode for low RMS
current and low turn-on switching loss by using valley-
switching operation. Because of the lossless tshneu
blbeaekr acgirec uiint,d tuhcet voor lteangeer sgpyi
kies orf escwyictclehd i.s Tclhaem psendu,b abnedr
capacitor is used as a DC-bus capacitor, which is
divided idnitroe cttlwy oc ocnadpuacctietdo rtso. tIhne
oadudtpituiot,n a, nsdo tmhee reinmpauitn inpgo
wpeorw eisr is stored in DC-bus capacitor. So, low
voltage rating capacitors can be used as the DC-bus
capacitor and power tarnaanlsyfseirs eifsfi
civeenrcifyie ids iomnp raonv edo.u tTphuet p4r8e
se[Vn]t eda ntdh eo6r0e ti[cWa]l experimental
prototype.
074 A Coupled Inductor Based High
Boost Inverter with Sub–Unity
Voltage source inverter (VSI) cannot provide an
output voltage higher than its input and needs dead–
Turns–Ratio Range
IEEE 2016
time scheme for its switches to prevent DC–link short
circuit due to spurious turn-on of switches by electro–
magnetic interference (EMI). Impedance source
inverters have eliminated these disadvantages by
providing boost functionality with improved EMI
immunity. Coupled inductor based impedance source
inverters provided increased gain at the expense of
increased coupled inductor turns–ratio. In this paper,
a coupled inductor based high gain inverter is
proposed which achieves higher gain by increasing the
coupled inductor turns–ratio (n=n2/n1) within a very
narrow turns–ratio range of 0 ≤ n < 1 which is a major
improvement over the other coupled inductor based
high boost impedance source inverters. The proposed
inverter, named Improved Trans–Current–Fed
Switched Inverter, is described along with its
equivalent operating states and relation between its
input and output variables are derived. The steady–
state inverter waveforms are shown using PSpice
simulations. The operation of the inverter is validated
by the experimental results which show strong
correlation with the theoretical analysis. A 110 V RMS
AC output is obtained from 26 V DC input using a
coupled inductor with turns–ratio of 0.33 to
demonstrate its high boost operation
075 A High Power Density Single-
Phase Inverter Using Stacked
Switched Capacitor Energy
Buffer
IEEE 2016
This paper presents a high power density 2 kW single-
phase inverter, with greater than 50 W/in3 power
density and 90% line-cycle average efficiency. This
performance is achieved through innovations in twice-
line-frequency (120 Hz) energy buffering and high
frequency dc-ac power conversion. The energy
buffering function is performed using an advanced
implementation of the recently proposed stacked
switched capacitor (SSC) energy buffer architecture,
and the dc-ac power conversion is performed using a
soft-switching SiC-FET based converter, with a digital
implementation of variable frequency constant peak
current control.
076 A ZVS Grid-Connected Full-
Bridge Inverter With a Novel
ZVS SPWM Scheme
A zero-voltage switching (ZVS) grid-connected
fullbridge inverter and its modulation schemes are
investigated. A novel sinusoidal pulse width
IEEE 2016
modulation scheme for the ZVS fullbridge inverter
(ZVS SPWM) is proposed in this paper. The ZVS
SPWM is evolved from the double-frequency SPWM
by adding gate drive to the auxiliary switch. The ZVS
condition is analyzed and the circulation loss of the
resonant branch is optimized by adjusting the energy
storage in the resonant inductor. The reverse
recovery of the body-diode of MOSFET is relieved and
ZVS is realized for both main and auxiliary switches.
The filter inductors are significantly reduced with
higher switching frequency. The design guideline of
resonant parameters and the implementation of
ZVS SPWM in DSP controller are introduced. The
ZVS SPWM scheme is verified on a 3-kW inverter
prototype. According to the experimental result, peak
efficiency as 98.8% is achieved.
077 Dual Buck Inverter with Series
Connected Diodes and Single
Inductor
IEEE 2016
In a DC-AC system, some problems may threaten
the reliability of the whole system, such as the shoot
through issue and the failure of reverse recovery.
Some methods are proposed to improve the reliability
of the converters. The dual buck inverters can solve
the above problems without adding dead time but the
dual buck topology has a main drawback of low
magnetic utilization which increases the volume and
weight of the system. This paper firstly summarizes
the traditional dual buck topologies including a kind of
single inductor dual buck inverter which can make full
use of the inductance. Then a method to improve the
reliability of the MOSFET inverter is proposed. A
kind of novel dual buck inverter with series connected
diodes and single inductor is introduced. The novel
inverter retains the dual buck topologies’ advantage of
high reliability and can make full use of the
inductance. Also, compared to the traditional single
inductor dual buck topology, the controlling strategy
of the proposed inverter is simpler. Finally, the
simulation and experimental results verified the
theoretical analysis.
078 Three-Phase Split-Source
Inverter (SSI): Analysis and
Modulation
In several electrical dc–ac power conversions, the ac
output voltage is higher than the input voltage. If a
voltage-source inverter (VSI) is used, then an
additional dc–dc boosting stage is required to
overcome the step-down VSI limitations. Recently,
several impedance source converters are gaining
higher attentions [1], [2], as they are able to provide
buck-boost capability in a single conversion stage. This
IEEE 2016
paper proposes the merging of the boost stage and the
VSI stage in a single stage dc–ac power conversion,
denoted as split-source inverter (SSI). The proposed
topology requires the same number of active switches
of the VSI, three additional diodes, and the same eight
states of a conventional spacevector modulation. It also
shows some merits compared to Z-source inverters,
especially in terms of reduced switch voltage stress for
voltage gains higher than 1.15. This paper presents the
analysis of the SSI and compares different modulation
schemes. Moreover, it presents a modified modulation
scheme to eliminate the low frequency ripple in the
input current and the voltage across the inverter
bridge. The proposed analysis has been verified by
simulation and experimental results on a 2.0-kW
prototype.
079 A Pulsewidth Modulation
Technique for High-Voltage
Gain Operation of Three-Phase
Z-Source Inverters
IEEE 2016
Z-source inverter (ZSI) was recently proposed as
a single-stage buck–boost dc–ac power conversion
topology. It augments voltage boost capability to the
typical voltage buck operation of the conventional
voltage source inverter with enhanced reliability.
However, its boosting capability could be limited;
therefore, it may not suit applications requiring a
highvoltage boosting gain. To enhance the boosting
capability, this paper proposes a new pulsewidth
modulation (PWM) technique to control the
generation of the shoot-through intervals in three-
phase ZSIs. The proposed modulation technique
achieves a reliable high-voltage gain operation without
adding any extra hardware to the ZSI structure, which
preserves its single-stage buck–boost conversion
nature. In this paper, the principle of the proposed
modulation technique is analyzed in detail, and
the comparison of the ZSI performance under the
conventional and the proposed PWM techniques is
given. The simulation and experimental results are
shown to verify the analysis of the proposed concept.
080 Switched-Coupled-Inductor
Quasi-Z-Source Inverter
IEEE 2016
Z-source inverters have become a research hotspot
because of their single-stage buck–boost inversion
ability, and better immunity to EMI noises. However,
their boost gains are limited, because of higher
component-voltage stresses and poor output power
quality, which results from the tradeoff between the
shoot-through interval and the modulation index. To
overcome these drawbacks, a new high-voltage boost
impedance-source inverter called a switched-coupled-
inductor quasi-Z-source inverter (SCL-qZSI) is
proposed,which integrates a switched-capacitor and
a three-winding switched-coupled inductor (SCL) into
a conventional qZSI. The proposed SCL-qZSI adds
only one capacitor and two diodes to a classical qZSI,
and evenwith a turns ratio of 1, it has a stronger
voltage boost-inversion ability than existing high-
voltage boost (q)ZSI topologies. Therefore, compared
with other (q)ZSIs for the same input and output
voltages, the proposed SCL-qZSI utilizes higher
modulation index with lower component-voltage
stresses, has better spectral performance, and has a
lower input inductor current ripple and flux density
swing or, alternately, it can reduce the number of
turns or size of the input inductor. The size of the
coupled inductor and the total number of turns
required for three windings are comparable to those of
a single inductor in (q)ZSIs. To validate its
advantages, analytical, simulation, and experimental
results are also presented.
081 Bidirectional Single Power-
Conversion DC-AC Converter
with Non-Complementary
Active-Clamp Circuits
IEEE 2016
This paper presents a bidirectional single power-
conversion dc-ac converter with non-complementary
active-clamp circuits. The proposed converter
comprises a bidirectional flyback converter and an
unfolding bridge. In order to interface the grid with a
low voltage energy storage through only single power-
conversion, the bidirectional flyback converter
ransforms the low voltage directly into the folded grid
voltage and regulates the folded grid current. The
proposed converter adopts noncomplementary
operation strategy for the active-clamp circuits. By
using this strategy, the bidirectional flyback converter
not only avoids the voltage spike but also minimizes
the power losses by the circulating energy. Thus, with
single power-conversion and non-complementary
active-clamp circuits, the proposed converter obtains
high power efficiency. To facilitate the bidirectional
single power-conversion, a novel control algorithm is
developed. With this control algorithm, the proposed
converter ensures high grid power quality and
seamless mode transition. The proposed bidirectional
dc-ac converter is theoretically analyzed in detail. The
experimental results based on a 250W prototype are
provided to evaluate its performance.
082 High-Efficiency Bidirectional
DAB Inverter Using a Novel
This paper proposes a high-efficiency bidirectional
dual-active-bridge (DAB) inverter using a novel
Hybrid Modulation for Stand-
Alone Power Generating System
With Low Input Voltage
IEEE 2016
hybridmodulation for a stand-alone power generating
system with a lowinput voltage. The proposed DAB
inverter consists of a DAB dc–dc converter and
a synchronous rectifier (SR) for unfolding. The DAB
dc–dc converter transforms the low dc voltage into a
rectified sine wave that pulsates twice the grid
frequency. The rectified sine wave unfolds into the
grid voltage by SR. The proposed hybrid modulation
combines a phase shift control and a variable
frequency control. The variable frequency control
converts the nonlinear function of the phase shift angle
into a linear function and controls the output power.
This leads to a simple closed-loop control for the
sinusoidal current waveform, a low harmonic
distortion, and a high-voltage conversion ratio without
an increase of the transformer turn ratio. Since the
proposed DAB inverter has only a single power
conversion stage, it has a simple structure, high power
density, and low cost. It also has a high efficiency of
94.2% by a zero-voltage switching (ZVS) turn on of
the switches in two full bridges (FBs). The
operation principle of the proposed DAB inverter
using this hybrid modulation is analyzed and verified.
Experimental results for a 1-kW prototype are
obtained to show the performance.
083 Analysis and Design of Modified
Half-Bridge Series-Resonant
Inverter With DC-Link Neutral-
Point-Clamped Cell
IEEE 2016
In this paper, a modified half-bridge (HB) resonant
inverter topology with a dc-link neutral-point-clamped
cell is proposed. A pseudo asymmetrical voltage-
cancellation PWM method and a control strategy are
introduced. The proposed topology can maximize the
inverter output power factor, and minimize variations
in the switching frequency. In addition, most switches
are clamped to half of the dc input voltage at turn-off,
increasing the overall efficiency of the system for a
wide load range. The efficiency of the proposed
inverter is improved up to 7%at light-load conditions
compared with that of the conventional HB inverter.
Informative expressions for performance comparison
between the proposed inverter and its counterpart are
provided. In addition, the losses in the inverter
primary components are analytically analyzed in
detail. For validation, a 120-W prototype is
implemented,and experimental results are presented
084 Hybrid Modulation Scheme for
a High-Frequency AC-Link
Inverter
This paper describes a hybrid modulation scheme for
a high-frequency ac-link (HFACL) multistage inverter
comprising a front-end dc/ac converter, followed by
IEEE 2016
isolation transformers, an ac/pulsating-dc converter,
and a pulsating-dc/ac converter. The hybrid
modulation scheme enables 1) removal of the dc-link
filter evident in conventional fixed dc-link (FDCL)
inverters placed after the ac/pulsating-dc converter
stage and before an end stage voltage source inverter
and 2) significant reduction in switching loss of the
inverter by reducing the high-frequency switching
requirement of the pulsating-dc/ac converter by two-
third yielding higher efficiency, improved voltage
utilization, and reduced current stress. Unlike the
FDCL approach, in the HFACL approach, hybrid
modulation enables the retention of the sine-wave-
modulated switching information at the output of the
ac/pulsating-dc converter rather than filtering it to
yield a fixed dc thereby reducing the high-frequency
switching requirement for the pulsating-dc/ac
converter. Overall, the following is outlined: 1) hybrid
modulation scheme and its uniqueness, 2) operation of
the HFACL inverter using the hybrid modulation
scheme, 3) comparison of the efficiency and losses,
current stress, and harmonic distortion between the
hybrid-modulation-basedHFACL inverter and the
FDCL inverter, and 4) scaled experimental validation.
It is noted that the term hybrid modulation has no
similarity with themodulation scheme for a hybrid
converter (which are conjugation of two types of
converters based on a slowand fast device) reported in
the literature. The term hybrid modulation scheme is
simply chosen because at any giventime only one leg of
the inverter output stage (i.e., pulsating-dc/ac
converter) switch under high frequency, while the
other two legs do not switch. The outlined hybrid
modulation scheme is unlike all reported
discontinuous modulation schemes where the input is
a dc and not a pulsating modulated dc, and at most
only one leg stays on or off permanently in a 60° or
120° cycle.
085 A Family of Five-Level Dual-
Buck Full-Bridge Inverters for
Grid-Tied Applications
Dual-buck inverters feature some attractive merits,
such as no reverse recovery issues of the body diodes
and free of shoot-through. However, since the filter
inductors of dual-buck inverters operate at each half
cycle of the utility grid alternately, the inductor
capacity of dual-buck inverters is twice as much as
H-bridge inverters. Thus, the power density of dual-
buck converters needs to be improved, as well as the
IEEE 2016
conversion efficiency. In this paper, the detailed
derivation process of two five-level full-bridge
topology generation rules are presented and explained.
One is the combination of a conventional three-level
full-bridge inverter, a two-level capacitive voltage
divider, and a neutral point clamped
branch. The other method is to combine a three-level
half-bridge inverter and a two-level half-bridge
inverter. Furthermore, in order to enhance the
reliability of existing five-level DBFBI topologies,
an extended five-level DBFBI topology generation
method is proposed. The two-level half-bridge inverter
is replaced by a two-leveldual-buck half-bridge
inverter; thus, a family of five-level DBFBI
topologies with high reliability is proposed. The
operation modes, modulation methods, and control
strategies of the series-switch five-level DBFBI
topology are analyzed in detail. The power device
losses of the three-level DBFBI topology and five-level
DBFBI topologies, with different switching
frequencies, are calculated and compared. Both the
relationship between the neutral point potential
self-balancing and the modulation index of inverters
are revealed. A universal prototype was built up for
the experimental tests of the three-level DBFBI
topology, the five-level H-bridge inverter topology, and
the existing three five-level DBFBI topologies.
Experimental results have shown that the five-level
DBFBI topologies exhibit higher efficiency than the
five-level H-bridge inverter topology and the three-
level DBFBI topology. As well, the higher power
density has been achieved by the five-level DBFBI
topologies compared with the three-level DBFBI
topology.
086 A New Cascaded Switched-
Capacitor Multilevel Inverter
Based on Improved Series–
Parallel Conversion With Less
Number of Components
IEEE 2016
The aim of this paper is to present a new
structure for switched-capacitor multilevel inverters
(SCMLIs) which can generate a great number of
voltage levels with optimum number of components
for both symmetric and asymmetric values of dc-
voltage sources. The proposed topology consists of a
new switched-capacitor dc/dc converter (SCC) that
has boost ability and can charge capacitors as self-
balancing by using the proposed binary asymmetrical
algorithm and series–parallel conversion of power
supply. The proposed SCC unit is used in new
configuration as a submultilevel inverter (SMLI) and
then, these proposed SMLIs are cascaded together and
create a new cascaded multilevel inverter (MLI)
topology that is able to increase the number of output
voltage levels remarkably without using any full H-
bridge cell and also can pass the reverse current for
inductive loads. In this case, two half-bridge modules
besides two additional switches are employed in each
of SMLI units instead of using a full H-bridge cell that
contribute to reduce the number of involve
components in the current path, value of blocked
voltage, the variety of isolated dc-voltage sources, and
as a result, the overall cost by less number of switches
in comparison with other presented topologies. The
validity of the proposed SCMLI has been carried out
by several simulation and experimental results.
087 A Single DC Source Cascaded
Seven-Level Inverter Integrating
Switched Capacitor Techniques
IEEE 2016
In this paper, a novel cascaded seven-level inverter
topology with a single input source integrating
switched capacitor techniques is presented. Compared
with the traditional cascade multilevel inverter (CMI),
the proposed topology replaces all the separate dc
sources with capacitors, leaving only one H-bridge cell
with a real dc voltage source and only adds two
charging switches. The capacitor charging circuit
contains only power switches, so that the capacitor
charging time is independent of the load. The
capacitor voltage can be controlled at a desired level
without complex voltage control algorithm and only
use the most common carrier phase-shifted sinusoidal
pulse width modulation (CPS-SPWM) strategy. The
operation principle and the charging-discharging
characteristic analysis are discussed in detail. A 1kW
experimental prototype is built and tested to verify the
feasibility and effectiveness of the proposed topology.
088 A Three Phase Hybrid Cascaded
Modular Multilevel Inverter for
Renewable Energy Environment
This paper presents a three phase hybrid cascaded
modular multilevel inverter topology which is derived
from a proposed modified H-bridge (MHB) module.
This topology results in the reduction of number of
power switches, losses, installation area, voltage stress
and converter cost. For renewable energy environment
such as Photovoltaic (PV) connected to the micro-grid
system, it enables the tranformerless operation and
enhances the power quality. This multilevel inverter is
an effective and efficient power electronic interface
IEEE 2016 strategy for renewable energy systems. The basic
operation of single module and the proposed cascaded
hybrid topology is explained. The ability to operate in
both symmetrical and asymmetrical modes is
analyzed. The comparative analysis is done with
classical cascaded H-bridge (CHB) and flying
capacitor (FC) multilevel inverters. The Nearest Level
Control (NLC) method is employed to generate the
gating signals for the power semiconductor switches.
To verify the applicability and performance of the
proposed structure in PV renewable energy
environment, simulation results are carried out by
MATLAB/SIMULINK under both steady state and
dynamic conditions. Experimental results are
presented to validate the simulation results.
089 An Enhanced Single Phase Step-
Up Five-Level Inverter
IEEE 2016
In this letter, an enhanced step-up five-level inverter
is proposed for photovoltaic (PV) systems. Compared
with conventional five-level inverters, the proposed
topology can realize the multilevel inversion with high
step-up output voltage, simple structure and reduced
number of power switches. The operating principle of
the proposed inverter has been analyzed and the
output voltage expression has been derived. In
addition, the comparison with existing topologies of
single phase five-level inverters is presented. Finally,
experimental results validate the performance of
the proposed topology.
090 Novel Three Phase Multi-Level
Inverter Topology with
Symmetrical DC-Voltage
Sources
IEEE 2016
In this paper, a novel three phase modular multilevel
inverter (MMLI) is proposed. The proposed inverter
consists of primary cell and repetitive modular cells
which are connected in series arrangement with the
primary cell. Therefore, the proposed topology is able
to get more output voltages levels number by adding
extra modular cells. Both the sinusoidal pulse width
modulation (SPWM) and staircases modulation are
effectively executed. The proposed inverter is
distinguished by several advantages such as: reduction
in the number of semiconductor power switches,
reduced Dc-voltage sources count, high utilization
factor of the used Dc-voltagem sources, and the control
execution simplicity. Accordingly, them installation
cost and size are reduced. It is simulated using
MATLAB software package-tool. In addition, a
prototype is developed and examined, to verify both
control techniques and performance of the topology.
Moreover, experimental results are provided to
authenticate the simulation results and it show high
similarity with it.
091 Design and Implementation of a
Novel Multilevel DC–AC
Inverter
IEEE 2016
In this paper, a novel multilevel dc–ac inverter is
proposed. The proposed multilevel inverter generates
seven-level ac output voltage with the appropriate gate
signals’ design. Also, the low-pass filter is used to
reduce the total harmonic distortion of the sinusoidal
output voltage. The switching losses and the voltage
stress of power devices can be reduced in the proposed
multilevel inverter. The operating principles of the
proposed inverter and the voltage balancing method of
input capacitors are discussed. Finally, a laboratory
prototype multilevel inverter with 400-V input voltage
and output 220 Vrms/2 kW is implemented. The
multilevel inverter is controlled with sinusoidal pulse-
width modulation (SPWM) by TMS320LF2407 digital
signal processor (DSP). Experimental results show that
the maximum efficiency is 96.9% and the full load
efficiency is 94.6%.
092 A Novel Nine-Level Inverter
Employing One Voltage Source
and Reduced Components
as High Frequency AC Power
Source
IEEE 2016
Increasing demands for power supplies have
contributed to the population of high frequency ac
(HFAC) power distribution system (PDS), and in
order to increase the power capacity, multilevel
inverters (MLIs) frequently serving as the
high-frequency (HF) source-stage have obtained a
prominent development. Existing MLIs commonly use
more than one voltage source or a great number of
power devices to enlarge the level numbers, and HF
modulation (HFM) methods are usually adopted to
decrease the total harmonic distortion (THD). All of
these have increased the complexity and decreased the
efficiency for the conversion from dc to HF ac. In this
paper, a nine-level inverter employing only one input
source and fewer components is proposed for HFAC
PDS. It makes full use of the conversion of series and
parallel connections of one voltage source and two
capacitors to realize nine output levels, thus lower
THD can be obtained without HFM methods. The
voltage stress on power devices is relatively relieved,
which has broadened its range of applications as well.
Moreover, proposed nine-level inverter is equipped
with the inherent self-voltage balancing ability, thus
the modulation algorithm gets simplified. The circuit
structure, modulation method, capacitor calculation,
loss analysis and performance comparisons are
presented in this paper, and all the superior
performances of proposed nine-level inverter are
verified by simulation and experimental prototypes
with rated output power of 200W. The accordance of
theoretical analysis, simulation and experimental
results confirms the feasibility of proposed nine-level
inverter.
093 A Performance Investigation of
a Four-Switch Three-Phase
Inverter-Fed IM Drives at Low
Speeds Using Fuzzy Logic and
PI Controllers
IEEE 2016
This paper presents a speed controller using a fuzzy-
logic controller (FLC) for indirect field oriented
control (IFOC) of induction motor (IM) drives fed by a
four-switch three-phase (FSTP) inverter. In the
proposed approach, the IM drive system is fed by
FSTP inverter instead of the traditional six-switch
three-phase (SSTP) inverter for a cost-effective low
power applications. The proposed FLC improves
dynamic responses and, it is also designed with
reduced computation burden. The complete IFOC
scheme incorporating the FLC for IM drives fed by
the proposed FSTP inverter is built in
Matlab/Simulink and, it is also experimentally
implemented in real-time using a DSP-DS1103 control
board for a prototype 1.1 kW IM. The dynamic
performance, robustness, and insensitivity of the
proposed FLC with FSTP inverter fed IM drive is
examined and compared to a traditional PI controller
under speed tracking, load disturbances, and
parameters variation, particularly at low speeds. It is
found that the proposed FLC is more robust than the
PI controller under load disturbances, and parameters
variation. Moreover, the proposed FSTP IM drive is
comparable with a traditional SSTP IM drive,
considering its good dynamic performance, cost
reduction and low THD.
094 A Systematic Power-Quality
Assessment and Harmonic Filter
Design Methodology for
Variable-Frequency Drive
Application in Marine Vessels
Inmaritime industry, high fuel costs encourage use of
variable-frequency drives (VFDs) for energy-saving
applications. However, introduction of such nonlinear
loads in the vessel’s power distribution network
induces harmonics, which can lead to potential risks if
are not predicted and controlled. In this paper, a
systematic power-quality assessment and monitoring
IEEE 2016
methodology is proposed to calculate VFD
contribution to voltage distortion at the point of
common coupling (PCC), considering the source
short-circuit capacity and the existing vessel’s power
system harmonics. According to voltage harmonic
distortion limits set by marine classification societies,
design and sizing of appropriate harmonic attenuation
filters is made, including ac and dc chokes and
frequency-tuned passive filter options. The
effectiveness of the proposed power-quality analyzing
procedure is evaluated through a real practical
example, which includes harmonic filter design
for VFD retrofit application to fan and pump motors
that operate constantly during sea-going operation in a
typical tanker vessel. Power-quality field
measurements obtained through a harmonic
monitoring platform implemented on board verify that
total voltage harmonic distortion and individual
voltage harmonics at PCC are maintained below 5%
and 3%, respectively, showing that design complies
with relevant marine harmonic standards even in
the worst operating case.
095 BLDC Motor Driven Solar PV
Array Fed Water Pumping
System Employing Zeta
Converter
IEEE 2016
This paper proposes a solar photovoltaic (SPV)
array fed water pumping system utilizing a zeta
converter as an intermediate DC-DC converter in
order to extract the maximum available power from
the SPV array. Controlling the zeta converter in an
intelligent manner through the incremental
conductance maximum power point tracking (INC-
MPPT) algorithm offers the soft starting of the
brushless DC (BLDC) motor employed to drive a
centrifugal water pump coupled to its shaft. Soft
starting i.e. the reduced current starting inhibits the
harmful effect of the high starting current on the
windings of the BLDC motor. A fundamental
frequency switching of the voltage source inverter
(VSI) is accomplished by the electronic commutation
of the BLDC motor, thereby avoiding the VSI
losses occurred owing to the high frequency switching.
A new design approach for the low valued DC link
capacitor of VSI is proposed. The proposed water
pumping system is designed and modeled such that the
performance is not affected even under the dynamic
conditions. Suitability of the proposed system under
dynamic conditions is demonstrated by the simulation
results using MATLAB/Simulink software.
096 Commutation Torque Ripple
Reduction Strategy of Z-Source
Inverter Fed Brushless DC
Motor
IEEE 2016
Based on the Z-source inverter, this paper proposes
a novel commutation torque ripple reduction strategy
for brushless DC motor (BLDCM). The proposed
strategy employs the same modulation mode in both
the normal conduction period and the commutation
period, and the commutation torque ripple is reduced
by regulating the shoot-through vector and active
vector duty cycles. The proposed detection method
acquires the end point of commutation by comparing
the clamped terminal voltages with reference zero
level, and the signal-noise-ratio of the detection is
improved by avoiding the attenuation of the terminal
voltages. Furthermore, a certain pulse width of the
shoot-through vector can not only reduce the
commutation torque ripple but also provide a new
opportunity to detect the end point of commutation.
Moreover, Z-source inverter provides the buck–boost
ability for BLDCM drive system, then the dc voltage
utilization can be improved, and the safety of the drive
system can also be improved. In addition, this paper
analyzes the terminal voltages during each vector. The
experimental results verify the correctness of the
theories and the effectiveness of the proposed
approach.
097 Position Sensorless Control
Without Phase Shifter for High-
Speed BLDC Motors With Low
Inductance and Nonideal Back
EMF
IEEE 2016
This paper presents a novel method for position
sensorless control of high-speed brushless DC motors
with low inductance and nonideal back electromotive
force (EMF) in order to improve the reliability of the
motor system of a magnetically suspended control
moment gyro for space application. The commutation
angle error of the traditional line-to-line voltage zero-
crossing points detection method is analyzed. Based on
the characteristics measurement of the nonideal back
EMF, a two-stage commutation error
compensationmethod is proposed to achieve the high-
reliable and high-accurate commutation in the
operating speed region of the proposed sensorless
control process. The commutation angle error is
compensated by the transformative line voltages, the
hysteresis comparators, and the appropriate design of
the low-pass filters in the low-speed and high-speed
region, respectively. Highprecision commutations are
achieved especially in the high-speed region to
decrease the motor loss in steady state. The simulated
and experimental results showthat the proposed
method can achieve an effective compensation effect in
the whole operating speed region.
098 Single-Phase Grid Connected
Motor Drive System with DC-
link Shunt Compensator and
Small DC-link Capacitor
IEEE 2016
The single-phase diode rectifier system with small
DC-link capacitor shows wide diode conduction time
and it improves the grid current harmonics. By
shaping the output power, the system meets the grid
current harmonics regulation without any power
factor corrector or grid filter inductor. However, the
system has torque ripple and suffers efficiency
degradation due to the insufficient DC-link voltage. To
solve this problem, this paper proposes the DC-link
shunt compensator (DSC) for small DC-link capacitor
systems. DSC is located on DC-node parallel and
operates as the voltage source, improving the system
performances. This circuit helps the grid current-
shaping control during grid-connection time, and
reduces the flux-weakening current by supplying the
energy to the motor during grid-disconnection time.
This paper presents a power control method and the
design guideline of DSC. The feasibility of DSC is
verified by simulation and experimental results.
099 Single-Phase Input Variable-
Speed AC Motor System
Based on an Electrolytic
Capacitor-Less Single-Stage
Boost Three-Phase Inverter
IEEE 2016
This paper presents a single-phase to three-phase
adjustable-speed drive (ASD) system, which consists of
a diode rectifier and a single-stage boost inverter
without electrolytic capacitors (E-caps). The system
has no shoot-through issues and gains high reliability
due to the shoot-through zero-state regulation method.
By using electrolytic capacitors-less topology, the
lifetime can be greatly increased. By properly
designing the tapping position of the inductor, the
system has a high boost-inversion gain and can ride
through grid voltage sags. By using the proposed
harmonic injection method, the system can realize
high input power factor and small dc-link ripple
voltage, simultaneously. Experimental results of the
electrolytic capacitors-less single-stage boost inverter
(E-caps-less SSBI) based single-phase to three-phase
ASD system are obtained to verify the actual
performances.
100 Switching-Gain Adaptation
Current Control for Brushless
DC Motors
In this paper, a current control scheme with
switching-gain adaptation is proposed for brushless
DC motors. The scheme includes two components,
namely a continuous control component and a
switching control component. The continuous control
component is employed with model reference adaptive
control (MRAC) to approximate the parametric
IEEE 2016
uncertainties, and the switching control component is
used with integral sliding-mode control (ISMC) to
eliminate the general disturbance caused by both the
approximation errors and the unstructured
uncertainties. Due to the variation in general
disturbance in different operating conditions, a
switching-gain adaptation method based on the
unknown disturbance estimation isproposed, which
improves the transient performance of the current
controller and eliminates the high-frequency noise
of current caused by chattering. Finally, the
effectiveness of the proposed method is verified by
experimental results.
IEEE 2015 PROJECTS
CODE. NO PROJECT TITLES YEAR
1.POWER SYSTEMS
POWER QUALITY IMPROVEMENT, REACTIVE & HARMONIC
COMPENSATION
001 New Control of PV Solar Farm as STATCOM (PV-STATCOM) for
Increasing Grid Power Transmission Limits During Night and Day
2015
002 An Adaptive Power Oscillation Damping Controller by STATCOM
With Energy Storage
2015
003 A New Control Strategy for Distributed Static Compensators
Considering Transmission Reactive Flow Constraints
2015
004 A Voltage-Controlled DSTATCOM for Power-Quality Improvement 2014
005 An Improved Hybrid DSTATCOM Topology to Compensate Reactive
and Nonlinear Loads
2014
006 The Transformerless Single-Phase Universal Active Power Filter for
Harmonic and Reactive Power Compensation
2014
007 An Enhanced Voltage Sag Compensation Scheme for Dynamic Voltage
Restorer
2015
008 An Improved iUPQC Controller to Provide Additional Grid-Voltage
Regulation as a STATCOM
2015
009 A Grid-Connected Dual Voltage Source Inverter With Power Quality
Improvement Features
2015
010 Transformerless Hybrid Power Filter Based on a Six Switch Two-Leg
Inverter for Improved Harmonic Compensation Performance
2015
011 A New Railway Power Flow Control System Coupled
With Asymmetric Double LC Branches
2015
012 Analysis of DC Link Operation Voltage of a Hybrid Railway Power
Quality Conditioner and its PQ Compensation Capability in High
Speed Co-phase Traction Power Supply
2015
013 A Systematic Approach to Hybrid Railway Power Conditioner Design
With Harmonic Compensation for High-Speed Railway
2015
2.RENEWABLE ENERGY
A) WIND ENERGY APPLICATION
014 High-Gain Resonant Switched-Capacitor Cell-Based DC/DC Converter
for Offshore Wind Energy Systems
2015
015 DC Microgrid for Wind and Solar Power Integration
2014
B) SOLAR ENERGY APPLICATION
016 A Novel High Step-up DC/DC Converter Based on Integrating Coupled
Inductor and Switched-Capacitor Techniques for Renewable Energy
Applications
2015
017 Hybrid Transformer ZVS/ZCS DC–DC Converter With Optimized
Magnetics and Improved Power Devices Utilization for Photovoltaic
Module Applications
2015
018 Performance of Medium-Voltage DC-Bus PV System Architecture
Utilizing High-Gain DC–DC Converter
2015
019 A Single Stage CCM Zeta Microinverter for Solar Photovoltaic AC
Module
2015
020 Topology Review and Derivation Methodology of Single-Phase
Transformerless Photovoltaic Inverters for Leakage Current
Suppression
2015
021 A High Efficiency Flyback Micro-inverter With a New Adaptive
Snubber for Photovoltaic Applications
2015
022 High Step-Up Converter With Three-Winding Coupled Inductor for
Fuel Cell Energy Source Applications
2015
023 Optimized Operation of Current-Fed Dual Active Bridge DC-DC
Converter for PV Applications
2015
024 Online Variable Topology-Type Photovoltaic Grid-Connected Inverter 2015
3.GRID CONNECTED SYSTEMS
025 An Enhanced Islanding Microgrid Reactive Power, Imbalance Power,
and Harmonic Power Sharing Scheme
2015
026 A Novel Integrated Power Quality Controller for Microgrid 2015
027 Power Control in AC Isolated Microgrids With Renewable Energy
Sources and Energy Storage Systems
2015
4.VEHICULAR APPLICATIONS
028 General Analysis and Design Guideline for a Battery Buffer System
With DC/DC Converter and EDLC for Electric Vehicles and its
Influence on Efficiency
2015
029 Dual Active Bridge-Based Battery Charger for Plug-in Hybrid Electric
Vehicle with Charging Current Containing Low Frequency Ripple
2015
030 Reduced-Capacity Smart Charger for Electric Vehicles on Single-Phase
Three-Wire Distribution Feeders With Reactive Power Control
2015
031 A Non isolated Multi input Multi output DC–DC Boost
Converter for Electric Vehicle Applications
2015
032 New Interleaved Current-Fed Resonant Converter With Significantly
Reduced High Current Side Output Filter for EV and HEV
Applications
2015
5.AC AND DC DRIVES
033 PFC Cuk Converter-Fed BLDC Motor Drive 2015
034 Variable-Form Carrier-Based PWM for Boost-Voltage Motor Driver
With a Charge-Pump Circuit
2015
035 Sensorless Drive for High-Speed Brushless DC Motor Based on the
Virtual Neutral Voltage
2015
036 Independent Control of Two Permanent-Magnet Synchronous Motors
Fed by a Four-Leg Inverter
2015
037 Online Inverter Fault Diagnosis of Buck-Converter BLDC Motor
Combinations
2015
038 A Unity Power Factor Bridgeless Isolated Cuk Converter-Fed Brushless
DC Motor Drive
2015
6.BIDIRECTIONAL CONVERTER
039 A Zero-Voltage-Transition Bidirectional DC/DC Converter 2015
040 Steady-State Analysis of a ZVS Bidirectional Isolated Three Phase DC-
DC Converter Using Dual Phase-Shift Control with Variable Duty
Cycle
2015
041 Novel High-Conversion-Ratio High-Efficiency Isolated Bidirectional
DC–DC Converter
2015
042 DC–DC Converter for Dual-Voltage Automotive Systems Based on
Bidirectional Hybrid Switched-Capacitor Architectures
2015
043 A Novel PWM High Voltage Conversion Ratio Bi-Directional Three-
Phase DC/DC Converter with Y-Δ Connected Transformer
2015
044 Performance Analysis of Bi-directional DC-DC Converters for Electric
Vehicles
2015
7.LED LIGHTING APPLICATIONS
045 Offline Soft-Switched LED Driver Based on an Integrated Bridgeless
Boost–Asymmetrical Half-Bridge Converter
2015
046 A Novel Control Scheme of Quasi-Resonant Valley-Switching for High-
Power-Factor AC-to-DC LED Drivers
2015
047 A Novel Wall-Switched Step-Dimming Concept in LED Lighting
Systems using PFC Zeta Converter
2015
048 Analysis and Design of Single-Switch Forward-Flyback Two-Channel
LED Driver with Resonant-Blocking Capacitor
2015
8.POWER FACTOR CORRECTION CONVERTER
049 Bridgeless PFC-Modified SEPIC Rectifier With Extended Gain for
Universal Input Voltage Applications
2015
050 A Three-Level Quasi-Two-Stage Single-Phase PFC Converter with
Flexible Output Voltage and Improved Conversion Efficiency
2015
051 Front-End Converter With Integrated PFC and DC–DC Functions for
a Fuel Cell UPS With DSP-Based Control
2015
052 Loss-Free Resistor-Based Power Factor Correction Using a Semi-
Bridgeless Boost Rectifier in Sliding-Mode Control
2015
053 Power Factor Corrected Zeta Converter Based Improved Power
Quality Switched Mode Power Supply
2015
054 A New Interleaved Three-Phase Single-Stage PFC AC–DC Converter
With Flying Capacitor
2015
9.RESONANT CONVERTER/INVERTER
055 Hybrid Phase-Shift-Controlled Three-Level and LLC DC–DC
Converter With Active Connection at the Secondary Side
2015
056 Analysis and Design of LLC Resonant Converters With Capacitor–
Diode Clamp Current Limiting
2015
057 A Secondary-Side Phase-Shift-Controlled LLC Resonant Converter
With Reduced Conduction Loss at Normal Operation for Hold-Up
Time Compensation Application
2015
058 Optimal Design Methodology for LLC Resonant Converter in Battery
Charging Applications Based on Time-Weighted Average Efficiency
2015
059 Analytical Model of the Half-Bridge Series Resonant
Inverter for Improved Power Conversion Efficiency and Performance
2015
060 Multi-MOSFET-Based Series Resonant Inverter for Improved
Efficiency and Power Density Induction Heating Applications
2014
10.HIGH VOLTAGE
A)INTERLEAVED CONVERTERS
061 A High Gain Input-Parallel Output-Series DC/DC Converter With
Dual Coupled Inductors
2015
062 Bidirectional PWM Converter Integrating Cell Voltage Equalizer Using
Series-Resonant Voltage Multiplier for Series-Connected Energy
Storage Cells
2015
063 Multicell Switched-Inductor/Switched-Capacitor Combined Active-
Network Converters
2015
064 Reliability Evaluation of Conventional and Interleaved DC–DC Boost
Converters
2015
B)SWITCHED CAPACITOR BASED CONVERTERS
065 A Novel Switched-Coupled-Inductor DC–DC Step-Up Converter and
Its Derivatives
2015
066 Ripple Minimization Through Harmonic Elimination in Asymmetric
Interleaved Multiphase dc-dc Converters
2015
067 Analysis of the Interleaved Isolated Boost Converter With Coupled
Inductors
2015
068 High Step-Up Interleaved Forward-Flyback Boost Converter With
Three-Winding Coupled Inductors
2015
069 A Novel Transformer-less Interleaved Four-Phase Step-down DC
Converter with Low Switch Voltage Stress and Automatic Uniform
Current Sharing Characteristics
2015
070 Nonisolated High Step-Up DC–DC Converters Adopting Switched-
Capacitor Cell
2015
071 A Family of High-Voltage Gain Single-Phase Hybrid
Switched-Capacitor PFC Rectifiers
2015
072 A High-Efficiency Resonant Switched Capacitor Converter With
Continuous Conversion Ratio
2015
073 A Cascade Point of Load DC-DC Converter with a Novel Phase Shifted
Switched Capacitor Converter Output Stage
2015
074 Modeling Approaches for DC–DC Converters With Switched
Capacitors
2015
11.ZVS, ZCS (SOFT SWITCHING) CONVERTERS
075 Resonance Analysis and Soft-Switching Design of Isolated Boost
Converter With Coupled Inductors for Vehicle Inverter Application
2015
076 An Adaptive ZVS Full-Bridge DC–DC Converter With Reduced
Conduction Losses and Frequency Variation Range
2015
077 An Integrated High-Power-Factor Converter with ZVS Transition 2015
078 A Novel Load Adaptive ZVS Auxiliary Circuit for PWM Three-Level
DC–DC Converters
2015
079 Hybrid Modulated Extended Secondary Universal Current-Fed ZVS
Converter for Wide Voltage Range: Analysis, Design, and Experimental
Results
2015
080 Two-Stage Power Conversion Architecture Suitable
for Wide Range Input Voltage
2015
081 Naturally Clamped Zero-Current Commutated Soft-Switching
Current-Fed Push–Pull DC/DC Converter: Analysis, Design, and
Experimental Results
2015
082 A Soft-Switched Asymmetric Flying Capacitor Boost Converter with
Synchronous Rectification
2015
12.MULTIPORT CONVERTER
083 A Nonisolated Three-Port DC–DC Converter and Three-Domain
Control Method for PV-Battery Power Systems
2015
084 A Power Decoupling Method Based on Four-Switch Three-Port
DC/DC/AC Converter in DC Microgrid
2015
085 Three-Port DC–DC Converter for Stand-Alone Photovoltaic Systems 2015
086 A Family of Multiport Buck–Boost Converters Based on DC-Link-
Inductors (DLIs)
2015
087 An Isolated Three-Port Bidirectional DC-DC Converter for
Photovoltaic Systems with Energy Storage
2015
13.MULTIPLE OUTPUT CONVERTER
088 A High Step-Down Multiple Output Converter With Wide Input
Voltage Range Based on Quasi Two-Stage Architecture and Dual-
Output LLC Resonant Converter
2015
089 Single-Inductor Dual-Output Buck–Boost Power Factor Correction
Converter
2015
14.AC TO AC CONVERTER
090 A Bridgeless BHB ZVS-PWM AC-AC Converter for High-Frequency
Induction Heating Applications
2015
091 Novel Single-Phase PWM AC–AC Converters Solving Commutation
Problem Using Switching Cell Structure and Coupled Inductor
2015
092 Soft-Switching AC-Link Three-Phase AC–AC Buck–Boost Converter 2015
093 Ultra sparse AC-Link Converters 2015
15.INVERTER & MULTILEVEL INVERTER
094 Discontinuous Modulation Scheme for a Differential-Mode Cuk
Inverter
2015
095 A High-Efficiency MOSFET Transformerless Inverter for Nonisolated
Microinverter Applications
2015
096 A Multilevel Energy Buffer and Voltage Modulator for Grid-Interfaced
Microinverters
2015
097 Extended Boost Active-Switched-Capacitor/ Switched-Inductor Quasi-
Z-Source Inverters
2015
098 Grid-Connected Forward Microinverter With Primary-Parallel
Secondary-Series Transformer
2015
099 Minimization of the DC Component in Transformerless Three-Phase
Grid-Connected Photovoltaic Inverters
2015
100 Single Inductor Dual Buck Full-Bridge Inverter 2015
101 A Single-Phase Cascaded Multilevel Inverter Based on a New Basic
Unit With Reduced Number of Power Switches
2015
TECHNICAL COURSE OFFERINGS
Courses Embedded System, PCB Designing, MATLAB (DSP ,DIP , SIMULINK ,DAP,DVP), Networking, Network Security, Android Application Development, Electronic Circuit Creation and Debugging
Classes Weekend and Holidays
Duration 6 Month (60 Hours) Fee (Others) Rs 8750
Offerings Complete Study Material, Training, Certifications,Journal Publication Support and Placement Support
Batch Starts 6th Sep 15 and 27th September 2015 (2 Batches)
Short Term Courses
Courses Embedded System, PCB Designing, MATLAB (DSP ,DIP , SIMULINK ,DAP,DVP), Networking, Network Security, Android Application Development, Electronic Circuit Creation and Debugging
Classes Weekend and Holidays
Duration 2 Month (20 Hours)
Fee (Others) Rs 6750.
Offerings Complete Study Material, Training, Certifications ,SDK,Journal Publication Support
Batch Starts 6th Sep 15 and 27th September 2015 (2 Batches)