基于改进线路效能的电网脆弱性辨识方法研究

随着智能电网建设的不断推进,电网互联程度越来越高,加强电网安全稳定分析对预防大停电事故的重要性更加突出。针对电网进行脆弱性评估,找出其中的薄弱环节,是电网安全稳定分析的前提与基础。本文首先根据复杂网络理论,采用支路有功潮流重新定义线路效能权值,随后结合电网实际运行状态进行建模,通过求取系统运行状态或网络结构发生改变后的全局效能变化量,建立电网综合脆弱性评估指标,最后基于IEEE标准算例对电网脆弱节点和线路分别进行辨识。结果表明,与电源联系紧密的线路和重要枢纽节点对网络整体脆弱性指标有着显著影响,该方法可用于智能电网规划方案的评估及优化。

Vulnerability Identification in Power Systems Based on an Improved Line-efficiency Evaluation Approach

With the development of smart grid,the interconnection level of power systems is being enhanced so that it is very important to strengthen the security and stability analysis to prevent blackouts.Power system vulnerability identification is the prerequisite and foundation of power system security and stability assessment.Based on the complex network theory,we establish a comprehensive vulnerability index combining with the actual power grid operation,improve the line-efficiency definition using active value of transmission power flow,and identify vulnerable buses and transmission lines through calculating global efficiency variation when network topology or operation status changes.Simulations show that the transmission lines which are closely related to the power sources and key hub buses have great impacts on the overall vulnerability index of power systems.