基于集合论估计的电网状态辨识 (四)离群点识别
Power System State Identification Based on Set Theory Estimation Part Four Outlier Identification
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摘要: 首先从相容性的角度,对离群点的性质进行分析,提出不相容离群点和相容离群点的概念,并指出可能的离群点集合应包含不相容离群点和相容离群点两类离群点。进一步,提出状态辨识中离群点识别的两步法,即先识别出所有可能的不相容离群点集合,而后对可能的相容离群点进行筛分。对于不相容离群点,结合电力系统多层多级的网架结构,提出分层分级的不相容离群点搜索算法,使得搜索过程局部化,从而减小搜索空间,提高搜索效率。对于相容离群点,提出基于灵敏度的识别方法,可有效识别对解集影响最大的相容离群点,避免搜索起作用测点带来的组合爆炸问题。Abstract: The concepts of inconsistent outliers and consistent outliers based on the characterization analysis are proposed from the perspective of consistency.Besides,it is pointed out that the possible outlier sets should contain inconsistent outliers and consistent outliers.In addition,a two-step method for state identification is put forward.The method firstly identifies all possible inconsistent outliers and then classifies the possible consistent outliers.For inconsistent outliers,a hierarchical search algorithm is proposed according to the multi-level structure of power system.By localizing the search procedure,the search space is reduced and the efficiency of the search algorithm is improved significantly.For consistent outliers,a sensitivity analysis method is proposed to find the outliers which have the most impact on the result sets.By sensitivity analysis,the combination explosion problem of searching all the active measurements is avoided.
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