基于分岔理论研究励磁参数对系统电压稳定的影响

Influence of study excitation parameters on system voltage stability based on bifurcation theory

笔者以一个典型的3节点电力系统模型为例,应用AUTO 07分岔分析软件,分析了励磁系统调节器时间常数和放大倍数对系统电压稳定的影响。结果表明,采用双、单轴发电机模型所得分岔分析结果虽然有定量上的变化,但都有相同的定性特征,即在到达SNB分岔点以前均先出现Hopf分岔点。而且,励磁系统调节器时间常数的降低和放大倍数的升高,能改善系统电压稳定性。

The author, taking the typical 3-node power system model as an example, with the help of AUTO 07 bifurcation analysis software, analyzes the influence of time constant and amplification of excitation system regulator on system voltage stability. The result shows that though the quantity of bifurcation analysis result acquired by doub- le-axial and uniaxial generator model changes, the qualitative characteristic is approximately the same, which is that Hopf bifurcation point will appear before it reaches SNB bifurcation point. Besides, the reduction of time constant and the increase of amplification of excitation system regulator can improve system voltage stability.