Inverter Voltage Support for Ac Heating and Fast Charging of Electric Vehicles

Electric vehicles (EV) can withdraw significant amounts of electric power for ac heating and fast charging in subzero environments. This in turn can cause large voltage fluctuations and cycling of voltage-regulator tap changers which are ubiquitous in distribution grids. To study such detrimental impacts, this paper develops a load model that depends on the state of charge and temperature of battery packs to capture the aggregated impact of EV fleets on power grids.Then, a feedback control strategy is engineered to leverage the capabilities of commercial photovoltaic inverters to mitigate voltage fluctuations and tap-changer cycling. These advances are demonstrated using the IEEE 13 node test feeder.