基于回路可靠性贡献指标的电网薄弱点分析

Grid weak point analysis based on loop contribution index of the reliability

电网薄弱点分析通常采用灵敏度分析方法。提出了一种基于回路的大电网可靠性充裕度评估的薄弱点辨识新方法。该方法采用回路可靠性参数作为电网可靠性评估的输入参数,结合Birnbaum恒定方法确定回路中元件的重要度。为更好地区分系统中的薄弱点,在传统电网可靠性评估系统指标的基础上,推导出了回路贡献指标,从系统-回路-节点三个层面反映了电网的可靠性情况及薄弱环节。对某省实际电网的评估结果表明,该方法不用进行复杂的灵敏度计算且有效减少系统状态数量,克服了传统可靠性指标无法准确找到系统薄弱点的问题。

Power system＇s weak point analysis commonly uses sensitivity analysis method. This paper presents a new identification method of weak points based on loop bulk power system reliability of adequacy evaluation. The method puts the loop reliability parameters as input parameters to assess the reliability of the bulk power system, and determines the important degree of circuit elements based on Bimbaum constant method. To better distinguish the weak point in the system, this paper deduces loop contribution indices on the basis of the traditional grid system reliability evaluation indices. The system-loops-node three levels reflect the reliability of the electrical network and weak points. The actual assessment of province＇s power grid indicates that the method can effectively reduce the number of system status without complex sensitivity calculation, and overcome the problem that the traditional system reliability index can＇t accurately find the weak points.