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POWER ELECTRONICS LABORATORY
GATE DRIVE UNIT FOR A SIC MOSFET HALFBRIDGE MODULE
Supervisor: Nicolai [email protected]
Keywords: � hardware � magnetics
Description: Silicon Carbide (SiC) power semiconductorsare widely recognized as a disruptive technology. SiCMOSFETs switch faster and more efficiently than standardcomponents allowing very high efficiency and power density,e.g. in PV inverters, Tesla cars and emerging electric aircraft.
Fast switching transients of the new semiconductors, how-ever, pose significant challenges for the hardware design.In the scope of this project you will deepen practical know-ledge in testing of power electronics hardware, design oftransformers, selection of components, and PCB design thatis compact and immune to electromagnetic disturbances.
Theory: 10 , Practice: 90
The fruit of success is hanging low in this project but will re-quire autonomous working and a commitment that corres-ponds to the challenges.
CONTROL ALGORITHMS FOR GRID CONNECTED CONVERTERS
Supervisor: Nicolai [email protected]
Keywords: � control � simulation � hardware in-the-loop
Description: The share of wind and PV in the grid grows rapidly. To avoid blackoutsutility operators don’t allow anymore that renewable sources disconnect from the gridduring severe disturbances but require to support the grid voltage and frequency.
In Industrial Electronics I exercises you have made first steps in implementation ofcontrol algorithms for grid connected converters and know how to design a PLL fora disturbed grid. Much research has been done on how to control a grid connectedconverter during a grid disturbance or grid fault. In the course of the project you willlearn to implement some of such control schemes based on scientific publications.
Theory: 40Practice: 60
Autonomous working attitude andwillingness to read scientific styletexts are required.
IDENTIFICATION METHODS FOR GRID CONNECTED CONVERTERS
Supervisor: Marko Petković[email protected]
Keywords: #impedance #control #design #measurement #acquisition
Description: Recent trends in power system design such as an increas-ing share of renewable energy sources and smart grids require the inclu-sion of grid connected converters. This addition of converter may createdifferent subsystem interactions that require proper investigation andunderstanding through impedance-admittance measurement and sys-tem identification. One way of measuring impedance is through injec-tion of perturbation signals into an unknown object and measuring theresponse.System stability is even more deteriorated in the conditions of an unbal-anced grid where advanced control techniques and grid synchronisationtechniques need to be applied. The effect of applying these techniquesneeds to be properly characterised.Student who followed courses on control theory and grid connectedconverters are already acquainted with the concept and are invited tobroaden their practical and theoretical knowledge on the subject throughon a hardware-in-the-loop setup of a grid connected converter under un-balanced grid conditions.Theory: 50 Practice: 50 Prerequisites: Control theory, power elec-tronics, signal processing but most of all motivation.P.S: If everything goes well, you might have a publication under yourname in the end.
DESIGN AND MODELLING OF MAGNETIC COMPONENTS
Supervisor: Marko [email protected]
Keywords: #magnetics #modelling #design #optimisation
L 1 L 2R 1 R 2
Lm
N1:N2
Cr1
MFTCr2
IDC
UDC 1 I1 I22
3
4
’ ’L 1 L 2R 1 R 2
Lm
N1:N2
I1 I2
’ ’
0 20 40 60 80 100 120 140 160 180 200
-1
0
1
0
-100
100
-200
0
200
U12 [kV]
UCr1 [V]
I1 [A]
t [ ]
0 1 2 3 4 5 6 798
98.2
98.4
98.6
98.8
99
99.2
99.4
99.6
99.8
100
Effic
ienc
y [%
]
0.50 kHz 0.83 kHz 1.39 kHz 2.32 kHz 3.87 kHz 6.46 kHz10.77 kHz17.97 kHz29.97 kHz50.00 kHz
Pareto Front
Thermal Limit
fsw
Components & Materials
Prototype
Design Selection
ELECTRICAL INPUTS DIELECTRIC DISTANCES OPTIMISATION VAR RANGES
PREPARE DATA
CORE MATERIALS DATA
CORE DIMENSIONS DATA
WIRE DATA
DATA BASEINPUTS
DIRECT USER INPUTS
Winding Losses Calculation
Magnetic Energy Calculation
Core Losses Calculation
Mass and Volume Calculation
Hot-Spot Temperature Calculation
OPTIMISATION ENGINE
SAVE DESIGN
Calculate diw to match L ,ref
Calculate lg to match Lm,ref
Datasheet values
AWG, Kw, Fwg
diw ≥ dw1w2, lg ≥ 0, TC,hs ≤ TC,hs max, TW,hs ≤ TW,hs max
Un, In, f, D, Lm,ref, L ,refdw1c, dw2c, dw1w2
Bsat, K, , , , r, Fcg
N1, J, AWG, Kw, KC, Km
ELECTRICAL INPUTS DIELECTRIC DISTANCES OPTIMISATION VAR RANGES
PREPARE DATA
CORE MATERIALS DATA
CORE DIMENSIONS DATA
WIRE DATA
DATA BASEINPUTS
DIRECT USERINPUTS
Winding Losses Calculation
Magnetic Energy Calculation
Core Losses Calculation
Mass and Volume Calculation
Hot-Spot Temperature Calculation
OPTIMISATION ENGINE
SAVE DESIGN
Calculate diwdd to match L ,ref
Calculate lg to match Lm,ref
Datasheet values
AWG, Kw, Fwgww
diwd ≥ dw1w2, lg≥ 0, TCTT ,C hs≤ TCTT ,C hs max, TWTT ,W hs≤ TWTT ,W hs max
Un, In, f,ff D, Lm,ref,ff L ,refdw1c, dw2c, dw1w2
Bsat, K,KK , , , r, Fcg
N1, J, AWG, Kw, KCKK , Km
Algorithm
3D-DesignTesting
Description: Several projects are available, dealing withadvanced: design, modelling, characterisation, prototyp-ing and testing of magnetic components. Over the lastthree years, we have accumulated a great deal of exper-ience and know-how resulting in many publications andmore importantly ready test setups for experimental veri-fication of various phenomena. This allows for a quickcompletion of the main three prerequisites of any goodpublication or thesis: Hypothesis; Modelling and simula-tion; Experimental verification.All topics are multidisciplinary and have a strong publish-ing potential. Depending on your motivation and capabil-ities we can set realistic goals and achieve great results.Software (not mandatory): MATLAB, PLECS, ANSYSMaxwell (FEM), COMSOL Multiphysics (FEM), LaTeX.Requirements: Ambitious and motivated to learn. Yoursuccess is my success, thus ideally I want you to publish.
ULTRAFAST DC MICROGRID PROTECTION
Supervisor: Gabriele [email protected]
Keywords: #DCgrid #marinedistribution #DCinterruption
Description: I have different projects available, dealing with different aspects of marineLVDC current interruption devices. The challenge is to provide protection of a marineDC microgrid, where faults evolve much more rapidly than in traditional AC distributionnetworks. You can pick what you want among: electrical design and simulation, mech-anical design, device control and test setup.The project and expectations will be tailored based on your background. If you havesome specific interest we can see if this can be turned into something that is appealingto both of us.
TESTING AND COMMISSIONING OF THE MMC CELL
Supervisor: Milan [email protected]
Keywords: � PCB desing � hardware testing � MMC
Description: Students would become familiar with Modular Multilevel Converter (MMC),that has been widely used as a principal converter in High Voltage (HV) and MediumVoltage (MV) applications in recent years- HVDC, MVDC, Railway Electric Grid, All ElectricShips, Medium Voltage Electric Drives, etc. Medium voltage MMC prototype is currentlybeing developed in Power Electronics Laboratory. Its building block, so-called ”MMCCell”, has been designed and is currently being tested.Outcome:The outcome of the project should be detailed knowledge of the MMC Celldesign, and practical skills gained through the process of testing and commissioning.Theory: 40 , Practice: 60
REDESIGN OF CHB CONVERTER CELL
Supervisor: Marko Petković[email protected]
Keywords: #thermal design #stray inductance #converter cell
Description: 1 MW Cascaded H-Bridge is currentlybeing designed in PEL. First prototype of the cellhas been designed but as there is always roomfor improvement you could be a part of the designprocess and help us build the converter. Theconverter cell requires a redesign by properlycharacterising thermal stresses, stray inductanceestimation for reducing voltage overshoots andcontrol improvements.
As a student you will deal with CAD and FEMsoftware and work from an already establishedwork and knowledge.
Theory: 30Practice: 70Prerequisites: Motivation to learn.
POWER CONVERTER FOR SUPERCONDUCTING MAGNETS
Supervisor: Emilien [email protected]
Keywords: #DC/DCconverter #design #CERN
Description: In order to go beyond LHC, the CERN hardware needs to be upgraded withthe use of the latest technologies. To do so, a new kind of DC/DC power converteris developed, including energy storage and high modularity. The goal is to follow themission profile whilst drawing the least amount of energy from the grid.
Ratings of the converter: +/- 10 V 20’000 A.
The project will focus on the output stage of the converter, the one to process severalkilo ampere. Analysis of some components as well as practical realisation is foreseenfor this project.If you are willing to have a contribution in a very large project to power the fanciestmagnets on earth, then come on board!
VARIABLE-SPEED GENERATOR MODELLING FOR DC SHIPS
Supervisor: Seongil [email protected]
Keywords: #generator #modelling #simulation
Description: Generators driven by mechanical engines are commonly used in marinepower systems as a primary electrical power source. Unlike AC ships, there is no needto keep the constant power frequency (50 or 60 Hz) in DC ships. This provides freedomto employ variable-speed generators and it gives a big advantage in fuel savings.
The goal of this project is the transient modelling of the variable-speed generator in-cluding a rectifier and a constant power load. In addition, the controllers (an exciter, agovernor and a power controller) should be implemented by EMTP (Electro-MagneticTransient Program) software. With this, a student who will involve in this project willlearn the power supply systems of the DC ship and its control strategy (1 student).
Theory: 40 , Practice: 60
Electrical Load (%)
200
300
400
500
SFO
C (g
/kW
h)
SFOC with fixed speedSFOC with variable speed
0 20 40 60 80 100
25 % less fuel consumtion
ExciterA
B
CD4 D6 D2
D1 D3 D5
PRIMEMOVER
SYNCGEN
GOVERNOR
EXCITER
CONSTANTPOWERLOAD
CDC
VDC_ref
VDC
EFD
POWERCONTROLLER
PMECH
ωM_ref
ωM
FUEL
AUTOMATION OF DC MOTOR-GENERATOR SYSTEMS
Supervisor: Seongil [email protected]
Keywords: #generator #automation #PLC #HMI
Description: Generators driven by mechanical engines are commonly used in marinepower systems as a primary electrical power source. In the medium voltage researchfacility, two generator-DC motors sets are available for replicating the marine power sys-tems. Because of their physical distance the automation system should be necessaryto control the system in one place.
N
Va
Vc
Vb
Ve
ARMATURE
GRIDGRIDGRID
Ve
A
B
CD4 D6 D2
D1 D3 D5
CDC
ωM
HUMAN-MACHINE INTERFACE
PROGRAMMABLELOGIC CONTROLLER
DC MOTORSYNCHRONOUS
GENERATOR RECTIFIER
For the automation system of thegenerator-DC motor set, the tasks ofthis project are: development of con-trol algorithm, implementation of pro-grammable logic controller (PLC), es-tablishment of human-machine inter-face (HMI) and verification of completesystem. Students will not only havepractical experience on the automationsystem, but also learn the control of theDC power supply (2 students).
Theory: 20 , Practice: 80
MODULAR MULTILEVEL CONVERTER FOR PUMPED HYDRO STORAGE
Supervisor: Miodrag Basić[email protected]
Keywords: #MMC #control #design #hydro
Description: The project aims to increase flexibility and grid support of Pumped Hy-dro Storage Plants (PHSP) through variable speed operation. High-power MV ModularMultilevel Converter (MMC) is a promising alternative to monolithic converters, offeringsuperior voltage scalability, redundancy in operation, filter-less design, output voltagelevels that match existing machines. PHSP research platform at PEL is a reduced-scalemodel of the entire system, from hydraulic circuit to electric grid, rated at 6kV/0.5MVA.
An interested student could be involved in MMC design for PEL PHSP research plat-form, through control cabinet design, power stage cooling system design, or in-vestigation of system-level critical working points for the converter, grid codes etc.
6kV MVAC Link
PEL MMC cell 400V LVAC
IMSM
12-PulseRectifier
10kV MVDC Link
PHSP Hydraulic Part EmulationPHSP Electric Part - DUT
PHSP RT-HIL Emulation
PEL MV Lab
4Q Grid Emulator
6kV
MVA
C Li
nk
MMC ACS2000
MV IGCT SNUBBER DESIGN
Supervisor: Dragan [email protected]
Keywords: #IGCT #design #MVDC #practical
Description: Behaviour of the series connected IGCT switchingdevices in the Series Resonant Converter is the main topic of this pro-ject. Physical test setup has already been built for the application anddemonstration purposes and will be used to test the concepts ana-lysed and described after the project has finished.
LM LR CR
IGCT1
IGCT2
D1
D2
CDC
CDC
VDC
SDC
SDC
Several major steps for the successful closure of the pro-ject are literature investigation for the possible solutions,theoretical considerations of the impact of the snubbercircuit on the final converter, numerical simulation of theselected snubber and finally, definition of the design re-quirements for the final circuit.
pel.epfl.ch
