基于综合介数的电网脆弱线路辨识

Identification of vulnerable lines in power grid based on comprehensive betweenness index

基于电网运行状态、网络拓扑结构,综合考虑可对线路脆弱性产生影响的继电保护、节点电压偏移、线路地理位置等因素,提出了能更加准确识别电网脆弱线路的综合介数方法。其中,电网运行状态由发电端和负荷端的功率输送、实时潮流及潮流裕度来监测,网络拓扑结构则通过能对线路产生作用的发电机数量及可从线路吸收功率的负荷个数并结合线路介数来分析。以IEEE39节点系统为研究对象,在得出脆弱线路排序之后,使用三种常用的连锁攻击方式进行仿真测试,通过功率传输能力的变化情况来检验分析所提综合介数的有效性。测试结果表明,所提出的综合介数方法能较好地识别脆弱线路。

Considering comprehensively the influence of the relay protection, node voltage offset, geographical location and other factors, this paper puts forward a more accurate method based on the running state of power grid and topological structure of network to identify the vulnerable lines in power grid — the comprehensive betweenness method. Among them, the run-time state of grid is presented by power transmission of grid side and load side, the real-time power flow and flow margin. Combined with the number of generators which have exerted some influence on the grid with the number of load absorbing power from line, and taking line betweenness into account, the network topology structure can be analyzed. Taking IEEE39 system as the research object, the paper uses three kinds of chain attack to simulate when obtaining the order of vulnerable lines. Then the situation of the percentage of power transmission changing is used to analyze the effectiveness of the proposed comprehensive betweenness. The results show that the comprehensive betweenness proposed have a better recognition on vulnerable lines.