基于虚拟阻抗的厂站内拓扑分析新方法

A Novel Method of Substation Configuration Based on Virtual Impedance

厂站内拓扑分析是电力系统网络拓扑分析的重要组成部分,占用了整个网络拓扑分析的大量时间。在利用分布式建模方式减少网络拓扑分析时间的前提下,实现更为快速准确的厂站内拓扑分析,是提高整个网络拓扑分析效率的关键所在。本文通过分析节点导纳矩阵与初始邻接矩阵,节点阻抗矩阵与全连通邻接矩阵在表达网络拓扑上一致性的特征,考虑给发电厂变电站电气主接线开关赋以虚拟阻抗、电气节点添加虚拟接地阻抗支路的方式,提出了基于节点虚拟阻抗矩阵的厂站内初始拓扑分析以及开关变位跟踪的新方法。新方法避开了对初始邻接矩阵的直接处理,借助节点阻抗矩阵的拓扑对等性,从节点阻抗矩阵的物理意义出发,达到完成厂站内拓扑分析的目的。算例表明,新方法能够简便地完成厂站内的初始拓扑分析任务,并能在初始拓扑的基础上快速和准确地跟踪开关变位,相比于直接基于邻接矩阵的各种算法,具有编程实现简单、处理模式统一的特点。

Substation configuration is a vital part of the power system network topology,whose implementation takes plenty of the total time of topology analysis.On the premise that the distributed modeling and parallel treatment of station topology could reduce the time consumption for the whole power system topology analysis,the efficiency improvement of topology analysis focuses on the faster and more accurate substation configuration.By the analysis of the common topology characteristic which respectively exists in the original adjacent matrix and nodal admittance matrix,and in the complete connected adjacent matrix and nodal impedance matrix,a new method of original topology analysis and switch status changed tracking algorithm in the substation is proposed based on the nodal virtual impedance matrix in this paper,which utilizes the addition of the virtual impedances to each switch and the virtual grounding admittance branches to each electrical node.With the topology characteristic and physical significance of node impedance matrix,the aim to substation configuration has been realized by the novel way,and the directional treatment to the original adjacent matrix has been avoided as well.Finally,the example results validate that the new method can be used to finish the original analysis easily and track the change of switch status rapidly and accurately.Comparing to other conventional ways based on adjacent matrix directly,the new method is able to provide an easier way to program and a unified mode to process.