Current unbalance reduction in three-phase systems using single phase PHEV chargers

A method to reduce the current three phase unbalance using single phase Plug-in Hybrid Electric Vehicle (PHEV) chargers is presented in this paper. A reduction in the voltage unbalance has been achieved as a consequence of the mitigation of the current unbalance. The method performs the reactive power management on the PHEV charger in order to reduce the unbalance factor without affecting the battery charging time or charging power. The method works under restrictions to preserve the voltage quality. A simulation on Matlab-Simulink^® of a three phase housing group with power profiles, initial states of charge, charging start time and PHEV category randomly selected is presented. A reduction of 50 % at some times in the day is illustrated.