基于模态技术和Q-U曲线的一种电压稳定性指标

An index of voltage stability based on modal analysis and Q-U curve

结合电力系统自身的特点和要求,利用稳态运行情况下电力系统中的信息,采用模态分析技术和CPF法得出关键节点的Q-U曲线和临界电压。并在此基础上,利用一个新的电压稳定性指标(U/Ucr)2,来分析故障情况下系统的电压稳定性。用IEEE39母线系统进行了仿真计算,结果表明该方法计算速度快,准确性好,适用于在线电压稳定性分析。

Modal analysis technique and CPF method are used to acquire Q-U curve and threshold voltage of the key node in stability condition. Based on the analyzed voltage, a new voltage stability index （U/Ycr）^2 is used to analyse voltage stability of contingency condition. IEEE 39-bus system simulation shows that the method is fast, accurate and suitable for on-line voltage stability analysis.