利用临界发电机功角特性预估的电力系统暂态稳定直接分析法

本文基于单机能量函数法，利用临界机COI中心等值机故障后功角曲线的 近似正弦性，采用预估算法，用一正弦曲线代替机组故障后的实际功角曲线， 快速计算系统的稳定度并判别稳定性，为电力系统的暂态稳定安全分析提供了 一种快速有效的方法。同时本文对判别临界机群现有的F参数法进行了修正， 提高了判别的准确性和可识别性。

DIRECT METHOD BASED ON POWER ANGLE CURVE PREDICTING OF CRITICAL GENERATORS FOR POWER SYSTEM TRANSIENT STABILITY ASSESSMENT

A predicting method based on Individual Machine Energy Function is proposed in this paper. Because the postfault power angle curve of critical generators is approximately sinusoid, so we can consider it as a sine one, which is got by simulating the first three points of postfault generators, then get the stability margin and judge if the system is stable. The method is fast and efficient. The parameter F used for identification of critical generators is modified and better accuracy is got.