一种典型电力系统模型的电压稳定分岔分析

基于Walve综合负荷模型，采用非线性动力学理论中的分岔分析方法，对一种典型电力系统模型进行了电压失稳机理研究。研究结果表明该系统有4种引起电压失稳的方式：鞍结分岔导致电压单调失稳, Hopf分岔导致电压周期振荡或低频振荡失稳，倍周期分岔走向混沌引起电压失稳，吸引子共存、状态扰动改变运行状态导致电压失稳。研究结果还表明相邻母线的负荷相互作用将对电压稳定的定性定量性质产生影响；保证电压稳定的控制措施应首先考虑较低电压等级母线负荷的调整，条件许可时限制本地发电机的出力也不失为一种避免电压振荡失稳的方法。

BIFURCATION ANALYSIS FOR VOLTAGE STABILITY OF A TYPICAL POWER SYSTEM

Based on the Walve aggregated load model and the bifurcation analysis method of nonlinear dynamics,studies are worked on the voltage stability of a typical power system.Studies show thatfour m odes will result in voltage instability of the power system as shown in this paper. Those are monotonic decrease of voltage caused by saddle node bifurcation,periodically oscillation or chaotic oscillation of voltage caused by Hopf bifurcation,and voltage instability caused by period doubling bifurcation leading to chaos,or coexistence of different attractors with appropriate disturbance to states.This paper also shows that m utual effects among loads under different buses will im pose great im pact on voltage stability in quality and quantity characters,that regulations to loads under lower voltage level buses should be given first consideration to maintain voltage stability and that to limit the output of generator will prevent voltage from instability if allowed.