考虑元件关联性的节点综合脆弱评估模型

Node Integrative Vulnerability Evaluation Model Considering Component Relevance

针对大停电事故中故障元件之间的连锁相关性,提出了考虑元件关联性的节点综合脆弱评估模型。首先从电网拓扑结构和潮流分布的不均匀性出发,根据节点线路功率关联性给出节点重要度评估模型;然后从区域负荷波动的差异性出发,根据故障关联性提出节点抗压度评估模型;最后综合考虑重要度与抗压度建立节点脆弱性评估模型。该模型综合考虑了网络拓扑结构、运行状态对节点脆弱性的影响,能有效识别负荷增长时承担主要输电任务的节点,克服了以往方法不能随系统运行方式变化动态调整节点脆弱值的缺陷。通过新英格兰10机39节点系统仿真计算,验证了模型的正确性和有效性。

According to the linked relevance between faulty components in blackout, this paper presents a node inte- grated vulnerability evaluation model considering component relevance. Firstly, from the inhomogeneity of topologicdl structure of power grid and power flow distribution, node importance evaluation model is proposed on the basis of pow- er relevance between node and branch. Then from the difference of regional load fluctuation, node resistance evalua- tion model is also constructed according to fault relevance. Finally, node vulnerability evaluation model is built com- prehensively considering the importance and resistance. The model considers the effect of network topology, operation condition on the grid vulnerability. It can effectively identify the nodes that bear the main transmission task under load increasing, and overcome the insufficiency of previous methods which can＇t dynamically adjust the node vulnerability following system operation mode change. Simulation results on the New England 10-generator 39-node system indicate the correctness and effectiveness of the model.