强联系电网失步解列断面的捕捉方法研究

Capturing Method for Out-of-step Interface of Strongly Interconnected Power Gird

在两机等值系统的基础上,对在失步过程中失步断面联络线上的视在阻抗、测量电压、无功功率等电气量的变化规律进行分析。基于测量阻抗或测量电压最小值的解列断面捕捉方法虽能够反映解列装置到失步中心的距离,但不能识别出失步中心的方向。与电压之间存在强耦合关系的无功功率不仅可以反映出电压的特征,而且还具有流动的方向性。对华东电网安徽机组失稳模式下的失步断面进行仿真分析。

In the out-of-step process, the electric quantity changes on the out-of-step interface are analyzed on the ba- sis of the two-machine equivalent system, such as apparent impedance angle, measured voltage, reactive power. Al-though the out-of-step interface catching method, based on the minimum measurement of voltage or on the minimum measurement of impedance, can reflect the distance between out-of-step device and the oscillation center, it cannot reflect the direction of oscillation center. Reactive power, with a strong coupling relationship with voltage, can not on-ly reflect the voltage characteristics, but also can reflect the direction of oscillation center. Finally, the out-of-step in-terface in the instabe mode of Anhui units in East China power grid is simulated and analyzes.