考虑电磁功率突变的闭环紧急控制

Closed-loop emergency control method considering the abrupt change of electromagnetic power

提出一种考虑电磁功率突变的暂态稳定闭环紧急控制方案。现有的闭环紧急控制方案都没有考虑切机操作使发电机电磁输出功率发生突变这一现象,可能导致计算出的切机量不足。本方案在计算出切机量后并不立即实施控制,而是增加了切机量校验环节,预测按此切机量实施控制后的系统能否恢复稳定,如不稳定则对切机量加以修正。按照最终算出的切机量对系统实施控制,并对系统进行闭环监控,直至系统稳定。本方案可使对系统的切机控制更加精确,改善了闭环紧急控制的效果。仿真计算表明本方案是可行的。

A transient stability closed-loop emergency control method considering the abrupt change of electromagnetic power is proposed. The fact that the electromagnetic power will change abruptly when tripping generators is not considered in published papers, which might cause an insufficiency of tripping value. In this paper, the control is not taken into effect immediately after the tripping value is calculated. Instead, a verifying method of tripping value is implemented. The stability of the power system after tripping generators is estimated, and the tripping value is modified if necessary. After controlling the system by the verified generator tripping value, the system is under closed-loop supervision and control to stability. More precise control can be acquired using this method, and the effect of closed-loop emergency control is improved. The study is supported by simulating experiment with reasonable results.