主动解列控制中电网弱连接的一种在线识别方法  

An On-line Weak-connection Identification Method for Controlled Islanding of Power System

作　　者：倪敬敏[1] 沈沉[1] 李颖[1] 谭伟[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2011年第4期24-30,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50777032);新世纪优秀人才支持计划项目(NCET-08-0317)~~

摘　　要：电网中的弱连接是由电网的拓扑结构和实时运行状态决定的。系统发生机群失稳时,其失步断面将主要分布在这些弱连接线路上。主动解列控制需要在线识别系统的弱连接,并在弱连接上搜索解列断面。从电力系统慢同调理论出发,分析慢模式特征值对线路参数的灵敏度的特征,在此基础上提出一种实用的电力系统弱连接识别方法。推导特征值对于线路参数灵敏度的解析表达式,并基于此设计弱连接识别方法的详细步骤。4机11节点测试系统和华东电网上的仿真实验验证了该方法的有效性。同时,对所提方法在实际工程中的应用模式进行讨论。The weakly-connected ties in a power system are determined by the system＇s topology and real-time operating state. When cluster instability occurs, the interface among the out-of-step generator groups will mainly distribute among these weakly-connected ties. In islanding control, it is imperative to identify the weakly-connected ties in the system and search for the splitting cut-sets among these weakly- connected ties. Based on the slow coherency theory, this paper analyzed the sensitivity of slow mode eigenvalues to line parameters and proposed a novel method for the identification of weakly-connected ties. The analytical expression of the sensitivity of eigenvalues on line parameters was derived and the detailed steps of weakly-connected ties identification were designed. The effectiveness of this method was demonstrated through case studies on a test system and the East-China grid. Finally, the paper also discussed how to apply the method in practical engineering.

关 键 词：电网 慢同调 弱连接 主动解列 电力系统 

分 类 号：TM76[电气工程—电力系统及自动化]