基于柔性多状态开关的有源配电网双层优化方法

Bi-level optimization method for active distribution network based on soft open point

大量间歇性分布式电源的接入,给配电网带来了新的挑战。柔性多状态开关(Soft Open Point, SOP)是一种新型的电力电子装置,具有强大的功率调控和潮流优化能力。文中提出了一种基于SOP的有源配电网双层优化方法。考虑SOP运行控制的约束条件,建立了多端口SOP等效模型。以年综合费用最小为目标建立SOP上层规划模型,以多时段配电网电压偏差最小、网损最低为目标建立基于最优潮流的下层优化模型,并采用改进的遗传粒子群混合优化算法对双层优化模型进行求解。在IEEE 33节点算例上,对比分析了规划前后三端口SOP的优化能力。结果表明,SOP能有效解决配电网电压越限问题,同时降低系统损耗,并且合理的SOP规划对配电网运行优化效果更为显著。

The access of numerous intermittent distributed generators has brought new challenges to the distribution network.Soft open point(SOP)is a novel type of power electronics with the powerful capabilities of power regulation and power flow optimization.A bi-level optimization method based on SOP is proposed for active distribution network.Firstly,a multi-port SOP equivalent model is established,which considers the constraints of SOP operation control.Secondly,the objective of upper-level planning model of SOP is to minimize the annual comprehensive cost,and the objective of lower-level optimization model based on optimal power flow is to reduce the voltage deviation and net loss in distribution network.Then,combing the genetic algorithm with the particle swarm optimization,this paper presents a hybrid optimization algorithm to solve this bi-level optimization model.Finally,the optimization ability of the three-port SOP before and after planning is compared and analyzed on the IEEE 33-node test feeder.The results show that SOP can effectively solve the problem of voltage over-limit while reducing system losses.Moreover,reasonable SOP planning is more effective for operation optimization of distribution network.