考虑元件耐受性的电网关键元件辨识

Identification of Critical Components in Power Grid Considering the Resilience of Components

在历次大停电事故过程中,电网中存在少量元件对事故的演化发展起到关键性作用。为此,本文提出一种综合元件耐受性与重要性的电网元件关键性评估方法。从电网元件对电网电能传输影响的角度来衡量电网元件的重要性,分别定义了输电线路的潮流分布影响熵和节点电压影响熵;从引发电网元件失效的主导因素出发来衡量电网元件的耐受性,分别定义了输电线路在N-1准则下和节点在负荷波动下电网元件的耐受性指标;将耐受性指标与重要性指标综合来进行电网元件的关键性评估。最后,利用IEEE 39节点系统算例验证了所提方法的有效性。

In the evolution of blackouts,there were a few components that played an important role in the spread of cascading failures.To identify these critical components,a novel method that comprehensively takes both the resilience and criticality of components into account is put forward in this paper.Two criticality indexes,namely the power flow disturbance entropy and voltage disturbance entropy,are defined to evaluate the impacts of grid components on the pow⁃er transmission of grid.In addition,two resilience indexes,namely the resilience under N-1 failure and that under load disturbance,are defined to evaluate the resilience of grid components from the aspect of dominating factors that induce the failure of grid components.In analogy to risk evaluation,the resilience and criticality indexes are integrated so as to identify the critical grid components.The effectiveness of the proposed method is verified by a case study on an IEEE 39-bus test system.