分岔理论分析不同负荷模型对动态失稳模式主导性的影响

The Dominant Impact of DIP on Load Model Research Using Bifurcation Theory

为揭示不同负荷模型对系统动态失稳过程中功角失稳和电压失稳两种模式的主导性影响,引用分岔理论分析了同一系统网络在5种静、动态负荷模型下的发电机功角随负荷无功发生的分岔过程,分析了系统动态失稳的分岔机理和过程,可得出不同的负荷模型主导的系统失稳模式不同,利用分岔点对应的电压、功角特征可区分失稳模式具有普遍性,合理简化以及选用恰当的模型对识别导致电力系统失稳的主要诱因有着极其重要的作用。

In order to reveal the dominant impact of power system dynamic instability patterns(DIP) on different load models, including angle instability and voltage instability, the bifurcation process of typical power system are analyzed by the bifurcation theory under five kinds of static and dynamic load models. The result of the simulation has been verified by the different load models which introducing angle stability into bifurcation theory combined with voltage stability. The choice of load models would have an impact on the system instability mode, and it is meaningful to select the appropriate load model accurately for the power system dynamic stability analysis. The outstanding instability mode of power system is judged by different kinds of load models through analyzing the characteristics of the main bifurcation point. The bifurcation theory can be used to study the issue of power-angle stability and the question that it is difficult to distinguish the power system instability mode can be solved.