The key transmission cross-section are key monitoring links in the operation and scheduling of large power grids.Effective search algorithms are needed in operation mode analysis to identify key transmission sections,so that dispatchers can grasp and predict potential thermal stability risks in the system in advance.To this end,a key section search method for power grids based on cut set section trees was proposed,which can achieve fast and accurate key section search.Firstly,the bridge structure was searched for in the graph model to simplify the graph model;secondly,based on the sensitivity of line interruptions and the consistency of power flow direction,a relationship matrix of section composition was constructed,and the definition and construction method of cut set section tree were proposed;finally,combined with heavy overload identification,a key section search for power grid thermal stability with cut set properties was achieved.The test results on the IEEE 39 node system show that the proposed method can quickly and accurately obtain key sections of the power grid,which is more comprehensive than the cross-sectional results obtained by existing methods.
关键词
关键断面/割集搜索/潮流方向一致性/开断潮流/割集断面树
Key words
key transmission section/cut set search/power flow direction consistency/outage load flow/cut section tree
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