多机系统暂态稳定性快速判断的新方法

提出利用临界机群的动态观测数据，采用时间序列分析 预测模型预测临界机组转子角的变化轨迹，并据所建立的转子角预测模型多项式的导数是否变号作为系统失稳的识别判据，计算机仿真结果证实了本方法的准确性和有效性。

FAST DETERMINATION FOR TRANSIENT STABILITY OF MULTI-MACHINE POWER SYSTEM BY PART DYNAMIC DATA

When a disturbance occurs the transient stability of the power system is decided by generators that will incline to separate from the system. Basing on this fact, this paper presents a fast determination method for the transient stability of a multi-machine power system. Using the dynamic data in part, various tendencies of the boundary generator power angles can be predicted by the established prediction model of the power angle hased on timeuseries analysis. The transient stability can be determined by examining the existence of the limit value of the power angle. The method does not need any knowledge of the network and parameters. The effectiveness and accuracy of the proposed method are proved by the computer-simulated results for two practical multi machine power systems.