Reducing Capacity of Smart Charger for Electric Vehicles in Single-Phase Three-Wire Distribution Feeders with Constant DC-Capacitor Voltage-Control-Based Reactive Power Control Strategy

Abstract

This paper deals with a reduction of the capacity of the smart charger (SC) for electric vehicles (EVs) in single-phase three-wire distribution feeders under distorted source-voltage and load-currents conditions with the constant de-capacitor voltage-control-based reactive power control strategy. The instantaneous power flows into the SC demonstrate that balanced and sinusoidal source-currents with a controlled power factor (PF) of 0.90 on the secondary side of the pole-mounted distribution transformer (PMDT). It is, then, shown that controlling the reactive power on the source side reduces the capacity of the SC. Simulation and experimental results demonstrate that balanced and sinusoidal source-currents with a controlled source-side PF of 0.90 are obtained on the secondary side of the PMDT during both battery-charging and -discharging operations in EVs reducing the capacity of the SC.