特征值分析法在地区电网稳定分析中的应用

Application of Eigenvalue Analysis in Stability for Regional Power System

在"智能电网"背景下,对大电网的组成部分——地区电网进行小干扰稳定分析具有现实意义。特征值分析法是研究电力系统小干扰稳定性的一种有效方法,以河南商丘电网作为算例分析,考察实际系统运行方式对稳定性的影响,根据节点功率的变化,进行多运行方式的特征值计算。在模式分析中,根据特征值灵敏度判断发电机组对振荡模式的参与程度,以掌握电网更多的稳定性信息,为地区电网安全稳定运行提供必要指导。算例结果表明,特征值分析法能够有效地分析地区电网的小干扰稳定性,具有较好的实际应用前景。

It is important to analyze the small stability of regional power system during ＂smart grid＂ period. Eigenvalue analysis is one of the most useful methods for power system small signal stability studies. Analysis and calculation is based on Shangqiu regional power system of Henan province. To investigate the effect of system operation conditions to stability, nodal injection powers are repeated altered and eigenvalues are calculated under multi-operation conditions. In mode analysis, the participation degrees of generators to oscillation modes can be judged by eigenvalue sensitivities; so as to get more information of system stability, which is helpful for the operation. The result shows that eigenvalue method can effectively analyze small signal stability of regional system, and the method has good prospect.