基于Walve负荷模型典型电力系统多参数分岔分析

以通用非线性系统分岔分析软件Auto97为工具,对基于Walve综合负荷模型的典型3节点电力系统进行了多参数分岔分析。分析过程表明多参数分岔分析相对于单参数分析更能揭示系统参数对电力系统电压稳定性的影响情况。结果显示:选取较高的参考电压Vref与励磁增益KAVR不仅有利于提高功率传输极限、增加稳定裕度,而且有利于避免系统电压振荡失稳;同时表明Vref、KAVR之间具有一定的互补特性,可通过Vref和KAVR的协调运用,避开Hopf分岔,保证系统安全运行。另外表明,大的励磁极限将更有利于电力系统电压动态稳定

Multi-parameter bifurcation analysis of a typical power system with the Walve aggregated load model

This paper performs a multi-parameter bifurcation analysis of a typical power system with the Walve aggregated load model using a general nonlinear analysis software Auto97. The results indicate that the method by multi-parameter bifurcation analysis is superior to that by single-parameter analysis in discovering the influences of system parameters on voltage stability of power system. The results imply that a higher reference voltage(V_(ref)) and a bigger exciter-gain(K_(AVR))can not only increase the power transmission limit of the system, but also decrease the possibility of voltage collapse caused by system voltage oscillating. The analysis also indicates that there is a complementary relation between V_(ref)and K_(AVR), thus adjusting K_(AVR) and V_(ref) properly can avoid Hopf bifurcation and maintain the system's security operation, and that a higher limit of the excitation conduces to sustaining system voltage dynamic stability.