Design of Hybrid Controller for Voltage Profile Enhancement at Battery Energy Storage System Terminal of Solid State Transformer Based Charging of Electric Vehicles

Dinakar Yeddu, Loveswara Rao Burthi

Abstract


This paper presents a new design for charging  electric vehicle .It incorporates the battery energy storage system.  There is no need of converters between the electric vehicle and the battery energy storage system .Two battery strings were introduced for reliability’s sake and  were separately charged by two solid state transformers .The proposed design has increased the efficiency compared to the conventional Low frequency transformer based .The paper discusses mathematical modelling of solid state transformers.The battery energy storage system reduced the peak demand on the grid . Fast electric vehicle charging stations  reduce the maximum required grid connection power  and  avoid the upgrade of grid infrastructure by using the stationary battery energy storage system.The secound part of the paper discusses the integration of renewable energy sources and Battery energy storage systems to the Direct Current bus through a forward buck converter .They will cause voltage variations ,and  similarly changes in load causes  terminal voltage variations.So to keep voltage constant to 800 volts at terminals that supply power to electric vehicles , a novel design of line booster  is  implemented in the Forward converter  along with controllers. Together they are named hybrid controllers .one is fuzzy control based and  the other one is  proportional plus integral  control based  and implemented in matlab/simulink to verify its performance.A comparision is made based on the hybrid controllers output voltage,  In fact the fuzzy-based hybrid controller is the better one.It is simple and easy to design,where as proportional  plus integral control needs tuning to get the output voltage .Both the hybrid controllers will control the switching device  of the  forward buck converter ,thereby controlling  the output voltage  to 800V.


Keywords


Solid state transformer(SST), Electric vehicles(EV), Low frequency transformer(LFT), Battery energy storage system(BESS),Fuzzy logic controller, Proportional plus Integral controller(PI),Line booster

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References


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DOI (PDF): https://doi.org/10.20508/ijrer.v12i2.12915.g8502

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