基于背离路径的输电断面搜索新算法

针对潮流转移引起的连锁过载跳闸问题,分析了过载支路切除后的潮流转移特征,指出受潮流转移影响较大的支路都集中在与切除支路电气距离较近的范围内;给出了一种快速搜索与过载支路相关输电断面的新算法,把实时的电力网络转化成拓扑图,采用基于背离路径的前K条最短路搜索算法,快速搜索出受潮流转移影响较大的输电断面,避免了采用单一路径搜索时因搜索范围过小而使部分支路漏选的情况,保证了输电断面的完整性。当发生过载时,可通过分析过载切除对输电断面内支路的影响来快速估计整个系统安全性的影响,极大地减少了分析计算的负担,有利于防止连锁过载跳闸的发生。最后对中国电力科学研究院(CEPRI)36节点系统进行仿真分析,验证了该算法的有效性。

New Algorithm for Searching Tie Lines Based on Deviation Path

In allusion to cascading overload trips due to power flow transferring,the features of power flow transferring after switching off overloaded branches was analyzed and it was pointed out that the branches greatly affected by power flow transferring were concentrated on the range electrically adjacent to the switched off branches;a new algorithm to rapid search tie line related to the overloaded branches was given to turn real-time power network into topological graph,then the first k shortest paths based on deviation path was adopted to rapidly search out the tie lines greatly affected by power flow transferring,thus the situation of miss-searching of partial branches due to too small hunting zone under the single path-based search could be avoided and the integrality of tie lines could be ensured.When overload occurred,the affection of overload on the security of the whole power network could be rapidly assesses by means of analyzing the influences of overload trips on branches related to the lie lines,thus the calculation amount could be greatly reduced and it was favorable to prevent the occurrence of cascading overload trips.The effectiveness of the proposed algorithm was verified by simulation results of CEPRI 36-bus system.