The renewable energy supply of electric vehicle charging stations with distributed power supply is often less than the charging load of electric vehicles,which need supplement part of the electrical energy of the distributed power is not conducive to the stable operation of the distribution network. This paper proposes the linkage strategy of energy and the power of power grid system based on the unbalanced rate of the charging station.Consider to the distribution network has three types of peak-valley price,the charging station energy storage system SOC is divided into three parts correspondingly. Based on real-time micro renewable energy output and load conditions to find the unbalance rate(UR),when there is charge shortfall,the charging energy storage system and power grid to supplement the charge shortfall coordinated by the unbalanced rate as a ratio,and realized a coordinated energy control within the micro grid. To simulate the electric vehicle load by using Monte Carlo method,by comparing the equivalent load of distribution network under different circumstances of user response and SOC of charging station energy storage system,the validity of this strategy in micro-grid operation optimization is verified. This strategy gives full play to the joint operation of charging system and power grid,reduces the difference between the peak and valley of the power grid and optimizes the power grid load operation curve.%含分布式电源的电动汽车充电站的可再生能源供给常常小于电动汽车充电负荷,须要配电网辅助补充部分电能,不利于配电网的稳定运行.文章提出基于微电网内不平衡率的充电站储能系统的电能与电网电能联动策略.考虑配电网有峰、谷、平3种电价,故将充电站储能系统SOC分成3部分与之相对应,根据微网内可再生能源实时出力与负荷求出不平衡率UR.当充电出现缺额时,由充电站储能系统和电网以不平衡率为比例协同补充充电缺额,实现了微电网内的能源协调控制.文章采用蒙特卡洛方法模拟电动汽车负荷,通过对比不同用户响应度的配电网等效负荷和充电站储能系统SOC,验证了该策略在微电网运行优化的有效性.该策略充分发挥了充电站储能系统和电网的联合运行优势,减小了电网负荷峰谷差,优化了电网负荷曲线.
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