基于准稳态分析求取中长期电压稳定极限新方法

摘要

采用准稳态分析方法,通过一系列准稳态平衡点获得中长期系统轨迹,研究了考虑负荷需求增长模式和系统扰动影响下的中长期电压稳定极限.该算法通过选取连续变量使得在系统极限点附近具有良好的收敛性,能较准确地计算负荷裕度,兼顾了计算的效率和准确性.基于该算法首先研究了一类较简单情况,即只考虑静态负荷和由OLTC动作所反映的负荷恢复；然后考虑更为一般的情况,即系统中含具中长期恢复特性的动态负荷.最后给出了基于测试系统的仿真算例,验证了方法的正确性.%This paper adopts Quasi-Steady-State analysis to study long term voltage stability problems resulting from small disturbances or load increase. The long term evolution is traced by successive equilibrium points, hence offering a good compromise between efficiency and accuracy. First a simply case is discussed, where only static load model is adopted and long term load restoration is considered by OLTC tap changing, then load models with long term restoration is dealt with. Numerical results are illustrated on a test system, by which the accuracy of the method is also approved.