Evaluation of Impact on Voltage Regulation by Management of Electric Vehicle Charging in Japanese Actual Distribution Network Model

In this study, we comprehensively evaluated the impacts of popularizing electric vehicles (EVs) and the time shift of EV charging on voltage regulation in distribution systems. Although the popularization of photovoltaics (PVs) and EVs is required to realize a sustainable society, the generation from PVs and the charging demand of EVs may cause voltage violations in distribution systems. To combat these challenges, distribution system operators (DSOs) must upgrade the facilities and management of distribution systems. To verify the strategies for future operations, DSOs evaluate the impact of distributed energy resources (DERs) installation and the effectiveness of the countermeasure candidates on voltage regulations. Therefore, this study assesses the impacts of EV popularization on voltage regulation using an actual distribution system model in the Hokuriku area of Japan. In the numerical simulation, EV and PV popularization levels are set from 0 % to 100 % in 20 % increments. Additionally, the effectiveness of the time shift of EV charging as a countermeasure for voltage regulations is evaluated. To validate the effectiveness, ratios of time-shift EVs are set to 20 % and 50 %. The results reveal the effectiveness and limitation of the time shift of EV charging.