电动汽车接入下考虑需求响应与网络重构的供电能力动态评估

电动汽车接入配电网将会形成新的供电瓶颈,降低电网的供电能力。文章提出配电网动态供电能力评估指标体系,分别从时序动态行为和静态断面特征两个层面,以及系统级与元件级的不同角度对供电能力进行量化评估。在此基础上,以最大供电电量指标为目标函数,以网络重构和负荷需求响应为手段来引导新增负荷与电动汽车充电负荷的动态行为,构建了提升网络最大供电电量的供电能力评估模型。此外,通过二阶锥松弛、big-M法等技术对原评估模型进行非线性处理,从而转化为混合整数二阶锥规划问题,并采用商业求解软件CPLEX进行高效求解。最后,通过修改的IEEE 33节点系统算例验证了所提方法具有提高电网负荷均衡度与供电能力等优点。

Dynamic Assessment of Power Supply Capacity Considering Demand Response and Network Reconfiguration under the Integration of Electric Vehicles

Integration of electric vehicles(EV)will introduce a new bottleneck for power supply into distribution network and lower the load supply capability.The evaluation index system for dynamic power supply capability is proposed to depict the sequential dynamic behaviors and the static cross-section characteristics respectively,and quantities the power supply capability from the system level and components level separately.On this basis,an optimization model targeting to improve the maximum power supply capability is formed,which leads the dynamic behavior of newly added load and EV charging load to enhance the power supply capability by the means of network reconfiguration and demand response.Successively,some nonlinear processing technologies such as second-order cone programming and big-M method will be taken to transform the original model into a mixed integer second-order cone programming model which will be solved by CPLEX efficiently.Finally,case studies on the modified IEEE-33 bus system demonstrate that the proposal will improve the load supply capability and load equilibrium simultaneously.