考虑负荷静态电压特性的重负荷节点静态电压稳定分析

首先从理论上论述了负荷静态电压特性对静态电压稳定的影响作用。在功率供求关系紧张状态下,电压稳定临界区域电压陡降时负荷静态电压特性影响显著,应计及阻抗负荷和恒电流负荷对静态电压稳定的作用,使用综合负荷进行计算。同时,接近分岔点时采用负荷导纳描述负荷功率需求,使用负荷导纳模型法计算电压稳定极限值及PV曲线下半部分的值。对IEEE30节点系统进行仿真计算分析,结果证明了所提出方法的有效性,同时快速性和精确性得到了保证。

Steady-state voltage stability analysis of heavy load node considering the steady-state load characteristics

This paper describes the influence of the stead-state load characteristics on the stead-state voltage stability theoretically. While the operating points lie on the critical zone or the steep segment belong to upper half of the p-v curves, the stead-state load characteristics affect significantly. Then while the operating points close to bifurcation point and lie on the lower half of the p-v curves, load needs should be described by load admittance models. The method, adopting admittance model in load bus, can compute voltage stability limit effectively. At last, the approach is illustrated with IEEE30 system. The results show the effectiveness of the method and seal of the very fast computation and accuracy.