基于MATCONT的电力系统电压稳定分岔及控制仿真试验

Simulation Tests of Voltage Stability Bifurcation and Control in Power Systems Based on MATCONT

介绍了电力系统ODE模型中引起电压失稳的常见分岔类型及分岔控制的基本概念;运用基于Matlab的数值分岔分析软件MATCONT对一个经典单机—动态负荷系统进行了分岔分析,验证了PQ动态负荷模型系统存在着鞍结分岔(SNB)现象,而RL动态负荷模型系统并无分岔现象产生。为延迟PQ动态负荷模型系统的鞍结分岔点,在原系统中引入了线性状态反馈控制和SVC控制两种分岔控制方法。MATCONT仿真结果显示,这两种控制方法均能够有效延迟鞍结分岔,从而提高系统的电压稳定性,并可通过选择合理的反馈控制器增益及SVC增益获得理想的分岔控制效果。

The bifurcation types that induce voltage instability in the ODE model in power systems and the concept of bifurcation control were introduced in this paper.The MATLAB-based numerical bifurcation analysis software MATCONT was used to study the bifurcation behavior of a classical single-machine dynamic-load system.The simulation results show that there is a saddle-node bifurcation（SNB） in the PQ dynamic-load model system and there are no bifurcations in the RL dynamic-load model system.To delay the SNB point of the PQ dynamic-load model system,the linear state feedback control method and SVC control method were used respectively in the original system.The MATCONT simulation results prove that the two types of bifurcation control methods can both delay the SNB effectively and thus improving voltage stability.And the conclusion reached can demonstrate that ideal control can be achieved by choosing appropriate value of the feedback controller gain and SVC gain.