Modelling EVs in residential distribution grid with other nonlinear loads

Unregulated charging of electric vehicles (EVs) could impact load characteristics in distribution networks. Difficulties with power quality may appear in residential networks where the grid is weak. For providing greater capabilities to EV charging, the power quality aspects have to be considered in addition to the load increase analysis. This paper discusses the harmonic content of the EV charging load and the changing power quality indicators in the residential distribution network. Actual EV charging measurement results are presented and averaged current harmonic amplitude and phase angles values for EV charging load modelling are proposed. Results of different modelling scenarios are presented and analyzed. The results of the study showed an extensive harmonic distortion in residential load current and voltage distortion at the substation´s busbar. The results pointed out in the paper can be further used for modelling the actual harmonic loads of the EVs in distribution networks.