Bidirectional AC-DC Converter for Vehicle-To-Grid (V2G) Applications

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AC-DC Converter
   Marquee University  e-Publications@Marquee Ma!' !! (2009 -)D$!a$, !!, a P!$a& P%!c Bidirectional AC-DC Converter for Vehicle-to-Grid (V2G) Applications  Arjun Raj Prabu Andhra Sridhar  Marquee University R!c!! C$a$  A#a S$#a, A% Ra% Pab, B$$!c$a& AC-DC C!!  V!#$c&!--G$ (V2G) A**&$ca$ (2015).  Master's Teses(2009 -). Pa*! 340.#*://!*b&$ca$.a+!!.!/#!!_*!/340  BI-DIRECTIONAL AC-DC CONVERTERFOR VEHICLE-TO-GRID (V2G) APPLICATIONS byArjun Raj Prabu Andhra SridharA Thesis submitted to the Faculty of the Graduate School,Marquette University,in Partial Fulfillment of the Requirements forthe Degree of Master of ScienceMilwaukee, WisconsinDecember 2015c  Copyright 2015 by Arjun Raj Prabu Andhra Sridhar  To my ever-supporting parents and my family  ABSTRACTBI-DIRECTIONAL AC-DC CONVERTERFOR VEHICLE-TO-GRID (V2G) APPLICATIONSArjun Raj Prabu Andhra SridharMarquette University, 2015Electric vehicles are growing at a rapid pace in the internal combustion enginedominated transportation sector, and bring environmental and economic benefitsto society. Electric vehicles produce nearly zero carbon emission, provided thatthey are charged through renewable energy sources. Electric vehicles reduce ourdependency on foreign oil and also offer additional benefits like Vehicle-to-grid(V2G). V2G is a technology that allows electric energy stored in the electric vehi-cle batteries to be returned to the grid during peak demand. V2G can also pro-vide voltage regulation, voltage shaving, reactive power compensation and dis-tributed generation. This necessitates that an electric vehicle battery charger be bi-directional, capable of sinking or sourcing real and reactive power. The stateof the art battery charging converter is unidirectional and has multiple stages of power conversion.In this thesis, a single phase, single stage, isolated, bi-directional SiliconCarbide (SiC) AC-DC converter based on Dual Active Bridge (DAB) topology isproposed and analyzed. Direct-quadrature axis (DQ) current control of the DAB- based topology is implemented with phase shift modulation. Simulation resultsare presented with various operating conditions showing the converter’s ability tosink or source real and reactive power in the AC grid. Hardware and firmwareimplementation of a single phase bi-directional AC-DC converter operating at 100kHzutilizingSiliconCarbide(SiC)MOSFETsarediscussedindetail. Experimentalresults are shown confirming simulation results.Asinglephasebi-directionalAC-DCconverteruseslargeelectrolyticcapac-itors to filter ripple currents in the DC bus. Electrolytic capacitors are bulky andarepronetofailure. Theseelectrolyticcapacitorscanbeeliminatedbyrejectingtheripple current in the DC bus. The ripple current is rejected by injecting a currentof same magnitude and opposite phase to the ripple current. A rigorous analysisis performed on the ripple rejection technique used in single phase bi-directionalAC-DC converters. Simulation results are presented to verify the analysis.A three phase bi-directional AC-DC converter improves the charging timeof the electric vehicles by charging the batteries at a higher power level. A threephase, single stage, isolated, bi-directional AC-DC converter is analyzed. DQ cur-rent control of the three phase AC-DC converter is implemented in simulation toverify the analysis.
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