基于广域信息跟踪电力系统振荡中心的方法及应用

A Wide Area Information Based Method of Tracking Power System's Oscillation Center and Its Application

提出了一种利用相量测量单元得到的广域信息跟踪振荡中心的方法。该方法依据线路两端母线电压相量和线路电压差相量的关系确定振荡中心位置并对其进行实时跟踪,不受振荡中心漂移的影响,当系统发生相继故障或连续开断造成振荡中心转移时,该方法仍能识别并跟踪。在此基础上,提出了失步振荡的检测判据及解列控制方案,设计了基于广域测量系统的距离保护振荡闭锁开放策略。仿真结果验证了该方法的有效性。

Using the wide area information obtained from phasor measurement units （PMU）,a method to track the power system oscillation center is proposed.According to the phase relation between bus voltage phasor and line voltage difference phasor,the proposed method can determine the position of the oscillation center and track it in real-time,not affected by the drift of the oscillation center.When the oscillation center transfers due to the occurrence of cascading faults or continuous tripouts,the oscillation center can still be recognized and tracked.On this basis,a criterion for asynchronous oscillation and an islanding control scheme are put forward,and a wide-area measurement system based strategy to unblock the oscillation blocking of distance protection is designed.The effectiveness of the proposed method is validated by simulation results.