A Modified Proportional Decentralized Charge Controller of Electric Vehicles for the Improvement of Local Voltage Profile

Incorporating electric vehicles (EVs) on a large scale into the distribution grid is a challenging task. Feeder overloads, system power losses, and voltage violations could all arise because of the unregulated charging of EVs. A centralized and coordinated control approach can monitor and manage the large number of EVs, however, requires high bandwidth and reliable communication channel. Proportional based decentralized charging control reduces charging current with the decreased local voltage that provides significant disadvantages to the downstream EVs. Therefore, this work developed a modified proportional decentralized control approach for EV battery charging that can improve the local grid voltage under heavy loading without significant charging current reduction of downstream EVs. A SiC-MOSFET switch-based H-bridge converter is utilized to experimentally validate the grid connected EV system. The proposed system is initially developed in MATLAB Simulink, and a SiC-MOSFET switch-based H-bridge converter was developed for laboratory validation.