考虑节点运行风险差异的多端柔性配电网络自适应潮流优化

为更好地平衡配电网运行优化中的安全性和经济性,提出考虑节点电压越限风险差异的多端柔性配电网潮流自适应优化方法。基于柔性开关设备(SOP)结构,建立SOP传输损耗模型;以网损与加权的节点电压偏差之和为目标函数,计及系统初始电压偏差状态和分布式电源(DG)实时渗透率,建立目标函数中网损和电压偏差的自适应权重模型,考虑电气距离、DG位置和源荷出力相关性,提出各节点电压偏差的赋权策略,从而构建配电网运行优化模型。以改进的3个IEEE 33节点馈线组为例,将模型转化为凸优化模型后采用内点法求解,结果表明所提模型是有效的,权重自适应策略可改善电压,降低网损,并提高优化模型对不同渗透率下配电网的适用性。

Adaptive power flow optimization of multi-terminal flexible distribution network considering voltage operation risk difference

In order to balance the security and economy in optimal operation of distribution network better, an adaptive power flow optimization method is proposed for multi-terminal flexible distribution network, which considers over-limit difference of node voltage. A transmission loss model of SOP(Soft Open Point) is built based on its structure. The sum of power loss and weighted node voltage deviation is taken as the objective function, the self-adaptive weight model of power loss and voltage deviation in the objective function is built with the consideration of initial voltage deviation and real-time penetration of DG(Distributed Generator),and the weighting strategy of voltage deviation at each node is proposed with the consideration of electrical distance, DG position and output correlation between source and load, thus an optimal operation model of distribution network is built. Three improved IEEE 33-bus feeder groups are taken as examples, the models are converted to convex optimization models and solved by interior point method, and results show that the proposed model is effective, the proposed strategy can improve voltage, reduce po-wer loss, and improve the applicability of the model to distribution network under different penetrations.