限制短路电流的线路开断全方案搜索方法  

Method of Searching All Feasible Breaking-line Schemes for Limiting Short-circuit Current

作　　者：张章 周宁[2] 吴浩[2] 王颖 陈亮 袁博 ZHANG Zhang;ZHOU Ning;WU Hao;WANG Ying;CHEN Liang;YUAN Bo(Economic and Technological Research Institute of State Grid Hebei Electric Power Co.,Ltd,Shijiazhuang 050011,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]国网河北省电力有限公司经济技术研究院,石家庄050011 [2]浙江大学电气工程学院,杭州310027

出　　处：《电力系统及其自动化学报》2020年第6期51-56,64,共7页Proceedings of the CSU-EPSA

基　　金：国网河北省电力有限公司科技项目(kj2018-054/5204JY17000)。

摘　　要：开断部分输电线路是限制电网短路电流水平的常用措施,由于单一的开断方案可能不能满足电网日益灵活多变的运行要求,为此提出了满足短路电流限制要求的线路开断全方案搜索方法.首先证明了节点短路电流与线路投切存在着单调关系;然后将开断方案表示为所开断线路的集合,进一步推导了开断方案的超标节点集与开断方案的子集方案(或超集方案)存在单调关系;利用这一关系得到了快速筛选开断方案的策略,避免了穷举所有线路开断方案.通过对IEEE 9节点系统和河北南部电网某分区220 kV层网络的算例分析,验证了基于上述原理的搜索方法的有效性.Breaking part of the transmission lines is a common measure to limit the short-circuit current(SCC)in a pow⁃er system.Since one single breaking-line scheme may hardly meet the increasingly flexible requirements of grid opera⁃tion,a method is proposed in this paper for searching all feasible breaking-line schemes that meet the SCC limitation re⁃quirements.First,a monotonic relationship between the nodal SCC and the switching line is proved.Then,the break⁃ing-line scheme is expressed as a set of its breaking lines,and the monotonic relationship between the corresponding SCC-exceeded-node set and the scheme’s subsets(or supersets)is further deduced.On this basis,a strategy for rapid⁃ly searching the feasible breaking-line schemes is formed,which can avoid validating each single scheme.The effective⁃ness of the proposed method based on the above principle is verified by two case studies,in which an IEEE 9-bus sys⁃tem and a 220 kV network in one subregion of Hebei Southern Power Grid are analyzed,respectively.

关 键 词：短路电流 线路开断方案 k线可行方案集 SC检验 

分 类 号：TM713[电气工程—电力系统及自动化]