A fast algorithm to estimate generation capacity tripped by emergency control for transient stability of large power system

Abstract

基于混合法提出了适合紧急控制的切机量快速估计算法。根据修正能量函数的守恒性定义了不同切除量下的暂态稳定裕度,研究了在首摆稳定情况下稳定裕度的求取过程,该稳定裕度在临界机群发生一定变化时仍具有规律性。该方法仅需2次仿真运算即可获得临界切除量初值。对广东梅州地区电网不同的N?2故障断面故障进行了仿真,结果表明,该方法可以求得正确的切机组合,减少了运行人员采用传统试探法求取切机组合的工作量。 A hybrid method based fast algorithm to estimate generation capacity to be tripped that is suitable to emergency control is proposed. According to the conservation of corrected transient energy function (CTEF) the transient stability margins under different generation capacity to be tripped are defined. The definition process of stability margin under the stable case of the first swing is researched. Such a stability margin still possesses regularity while a certain variation of critical machines (CM) takes place.This method only need two simulation calculations the initial value of critical tripped generation capacity can be obtained. For different N-2 faults and tie-line fault occurred in Meizhou regional power network in Guangdong province, using the proposed algorithm the correct combination of generators to be tripped can be achieved, so the dispatcher’s workload of solving generator combination to be tripped by traditional trial-and-error method can be reduced. 还原