Impact of Plug-in Hybrid Electric Vehicle Charging on Power Distribution Network

The rapid development of plug-in hybrid electric vehicle(PHEV) will greatly affect on distribution network.A charging model is established to analyze the affect of PHEV charging on distribution network and a coordinated charging strategy to mitigate the affect of PHEV charging on distribution network is proposed.The probability distribution of two key random factors influencing PHEV charging is analyzed and taking random factors into account a probabilistic model of PHEV charging load,whose charging power varies with charging curve,is built.There are different affections on distribution network while PHEV is charged by free charging mode or load valley charging mode,for this reason,a coordinated charging strategy,in which random factors are taken into account and the minimized load variance is taken as objective function,is put forward.Taking IEEE 40-bus radial distribution system as the case and through the simulation based on Matlab,the affects of the charging of different number of PHEV on load curve,network loss and nodal voltage deviation of distribution network under three kind of charging modes are analyzed.Analysis results show that adopting the proposed coordinated charging strategy the network loss and nodal voltage deviation can be reduced and the affects on PHEV charging on distribution network can be effectively mitigated.