Orderly Charging and Discharging Scheduling of DC V2G Charging Pile Considering Load Balance of Electricity Reticulation

Power system stability is an important problem in the development process of the electricity reticulation, and with the large-scale EV access to the electricity reticulation, its charging and discharging behavior to the planning and operation of the power system has a greater impact, and bring challenges to the safe and stable operation of the electricity reticulation, so the maintenance of electricity reticulation load balance becomes more and more important. Therefore, this paper designs the pre-stage AC/DC converter and the post-stage bi-directional DC/DC converter as the topologies of V2G charge-discharge machines. The mathematical models of AC/DC converter and bidirectional DC/DC converter are established. Combined with the driving and parking time characteristics of EV a spatial-temporal distribution model of parking demand and a V2G load capacity model of EV were established to promote the orderly scheduling of charging and discharging of charging piles. The experimental results show that the orderly charging of EV based on V2G Tech can significantly reduce the peak load of the grid, and the peak-valley difference of the balance load of the grid reaches 31.6%. Improve the stability of electricity reticulation load. In addition, the EV group feeds the distribution network during the peak period, which reduces the total load peak by about 8.2% and relieves the load pressure of the distribution network during the peak period.