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中文摘要：
基于两机等值系统来分析在失步状态下视在阻抗角的变化特征，并利用视在阻抗角的变化区域来判断系统是否失步。为了避免系统受到大扰动时容易出现错误判断失步振荡周期的情况，利用有功功率过零2次来进行检测：并基于无功功率的原理来确定失步中心是否落在本线路上。通过对2012年华东电网中安徽机组失稳模式进行仿真分析．验证了该判据的正确性。
英文摘要：
In the out of step condition, the analysis of apparent impedance angle according to the two-machine equivalent system is studied in this paper, and the characteristic of apparent impedance angle is used to distinguish whether the generators are out of step. For overcoming the misjudgment of oscillation period when the system is subjected to large disturbance, whether the active power crossing zero two times is utilized to correctly detect the out of step oscillation period. Moreover, the reactive power is used to distinguish whether the oscillation center lies in this line. Through the simulation and analysis of 2012 Anhui units’model of East China power grid, the correctness of this criterion is verified in this paper.
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