考虑网络增容与无功支撑的混合型智能软开关优化配置

Optimal allocation of hybrid open points considering network capacity increase and reactive power support

传统智能软开关(SOP)替换联络开关的工作模式使得支路传输功率完全受到SOP容量约束,限制了含高比例分布式光伏配电网的潮流转移能力。为此设计了结构灵活、控制模式可变的混合型智能软开关(HOP),并提出了考虑网络增容与无功支撑协同的HOP优化配置方法。分析了HOP在不同支路传输容量下的4种控制模式,并建立了考虑联络线和SOP功率流向的HOP功率模型;为获得光伏出力和负荷需求代表性场景,提出了基于堆叠自编码器特征提取的场景生成方法;考虑到HOP联络开关状态对潮流和网络拓扑的影响,推导含HOP的支路潮流方程约束,建立了考虑配电网重构的HOP优化配置模型,并通过线性化处理将优化配置模型转化为混合整数线性规划问题。算例结果表明HOP能够应对支路增容需求,降低配电网规划成本,提升分布式光伏消纳能力。

The operation mode of traditional soft open point(SOP) replacing tie switch makes the branch transmission power completely constrained by SOP capacity,which limits the power transfer capability of power distribution network with a high proportion of distributed photovoltaic.Therefore,a hybrid open point(HOP) with flexible structure and variable control mode is designed.An optimal allocation method of HOP considering network capacity increase and reactive power support is proposed.Four control modes of HOP under different branch transmission capacities are analyzed,and a HOP power model considering the power flow direction of the tie line and SOP is established.In order to obtain the representative scenario of photovoltaic output and load demand,a scenario generation method based on stacking sparse autoencoder is further proposed.Considering the influence of HOP switch state on power flow and network topology,the constrains of branch power flow equation with HOP is derived,and the optimal allocation model of HOP considering distribution network reconfiguration is established,and the optimization model is transformed into a mixed integer linear programming problem by linearization.The example results demonstrate that HOP can meet the demand of branch capacity increase,reduce the planning cost of distribution network,and improve the accommodation capacity of distributed photovoltaic.