含电动汽车的交直流混合微电网优化调度研究

Study on Optimal Dispatching of AC/DC Hybrid Micro Grid with Electric Vehicle

随着电动汽车的发展,电网中存在大量的电动汽车充电负荷。交直流微电网因其独特的优势,更加便于交流慢充桩和直流快充桩的接入。但是大规模电动汽车并网会给电网带来冲击,危害电网安全运行。针对含电动汽车的交直流微电网的优化调度问题,计及电动汽车的移动储能特性,根据充电紧急度确定用户的充电方式,以用户侧成本、网损成本、弃风弃光成本和负荷波动成本最小为目标建立了模型。基于二阶锥松弛、绝对值线性化、乘积变量线性化等方法,进行求解。最后算例结果表明了该调度策略的有效性,可以满足电动汽车良好接入交直流微电网。

With the development of electric vehicle(EV),there are a large number of EV charging load in the power grid.Because of its unique advantages,AC/DC microgrid is more convenient for the access of AC slow charging pile and DC fast charging pile.However,large-scale EVs integration will bring impact to the power grid and endanger the safe operation of the power grid.Aiming at the optimal dispatching problem of AC/DC microgrid with EVs,taking into account the mobile energy storage characteristics of EV,the charging mode of users was determined according to the emergency degree of charging,the model was established with the minimum goal of user side cost,network loss cost,abandoned wind and light cost and load fluctuation cost.Based on the methods of second order cone relaxation,absolute linearization and linearization of product variables,the solution was presented.Finally,the results show that the dispatching strategy is effective and can satisfy the good access of EVs toAC/DC microgrid.