计及凸极效应的双时标直接法暂态稳定分析

Two-time Scale Direct Stability Analysis Considering Salient-pole Effect

基于同步发电机单轴模型的双时间尺度特性,将电力系统模型分解为快子系统和慢子系统,并考虑发电机的凸极效应(即x’d≠xq),分别构造了快、慢子系统能量函数。将该能量函数与双时标直接法理论基础相结合,以确定主导不稳定平衡点(CUEP)。通过一个单机无穷大系统的仿真计算和稳定域分析,验证了该法在暂态稳定分析中的有效性。方法克服了目前双时标直接法不能考虑发电机凸极效应的不足。

Based on the two-time scale property of the one-axis generator model,the power system is decomposed into a fast-subsystem and a slow-subsystem and the energy functions for these subsystems are constructed considering the salient-pole effect of the generator（x＇d≠xq）.Combined with the theoretical basis of the two-timescale direct method,the approach for determining the controlling equilibrium point（CUEP）is proposed.The effectiveness of the method is validated by simulation and stability region analysis upon a single-machine-infinite-bus system.The method overcomes the deficiency of present method in considering the salient-pole effect of the generator.