Research on power supply modes for typical residential communities integrated with charging station for electric vehicles

Based on power supply modes for three typical residential communities, firstly the power quality indices and the K coefficients of transformers at the points of common coupling (PCC) and low-voltage buses of community power supply systems are calculated; then the impact of wide-range integration of charging station with residential communities on power quality and the existing residential community power equipments' ability of accommodating EV as well as the renovation of residential community power supply system are analyzed in depth; finally, the power supply mode for residential community suitable for wide-range connection of EV charging load and the characteristic condition of EV's on-board charger, which is permitted to be connected to the community power supply system, are put forward. Through this research it is found that power supply system for villa community can bear EV charging load and daily household load simultaneously; the power supply system for multi-storey residential community and that for high-rise residential community cannot bear the direct connection of EV's on board chargers, so it is necessary to configure independent power supply device for them. Using above-mentioned reasonable power supply modes both power quality indices for household consumption in different residential communities and the power quality index at the PCC can meet the demand on power quality even though the medium-sized on board changers are connected with the power supply system.