含电动汽车和智能软开关的配电网动态重构

Dynamic reconfiguration of distribution network with electric vehicles and soft open point

提出含分布式能源、智能软开关(SOP)和电动汽车(EV)有序接入的配电网重构策略。基于上班族的出行习惯模拟EV的无序充电模型,并构建配电网重构下的SOP模型;对于接入的EV无序充电负荷,采用拉格朗日松弛分散式优化算法和虚拟电价进行EV的有序调度;以最小化网损费用,SOP运行费用,弃风、弃光费用与开关动作费用之和为目标函数,通过大M法和二阶锥松弛将配电网重构模型转化为混合整数二阶锥规划模型,采用CPLEX求解器进行求解。IEEE 33节点标准系统的仿真结果表明,在配电网动态重构中采用SOP代替传统开关能够提升配电网运行的经济性,同时采用所提有序调度方法优化EV充电可以改善配电网电压质量。

A reconfiguration strategy for distribution network with DG(Distributed Generation),SOP(Soft Open Point) and orderly access of EVs(Electric Vehicles) is proposed. The disordered charging model of EVs is simulated based on the travel habits of office workers,and the SOP model under the reconfiguration of distribution network is constructed. For the disordered charging load of the accessed EVs,Lagrange relaxation decentralized optimization algorithm and virtual electricity price are adopted for orderly scheduling of EVs. The minimum sum of network loss cost,SOP operation cost,curtailment cost of wind power and photovoltaic power and switch operation cost is taken as the objective function,the reconfiguration model of distribution network is converted to a mixed-integer second-order cone programming model by big-M method and the second-order cone relaxation,and CPLEX solver is adopted for solution. The simulative results of IEEE 33-bus standard system show that the operation economy of distribution network can be improved by using SOP instead of traditional switch in the dynamic reconfiguration of distribution network,and the voltage quality of distribution network can be improved by adopting the proposed orderly scheduling method for the optimization of EV charging.