基于Walve负荷模型的励磁系统多参数分岔分析

文中以通用非线性系统分岔分析软件AUTO97为工具，以负荷功率、AVR控制参考电压、励磁增益和励磁极限为分岔参数，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。文中以负荷功率、AVR控制参考电压Vref、励磁增益KAVR和励磁极限Efdlim为分析参数，研究了Vref、KAVR以及Efdlim对系统电压稳定与运行情况的影响，得到了一些更接近实际的结论。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。分析结果表明：不考虑励磁极限时，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：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 EXCITATION SYSTEM WITH THE WALVE AGGREGATED LOAD MODEL

With the power demand at the load bus, the reference voltage to the AVR, the exciter-gain and the limit of the excitation chosen as parameters, this paper performed a Multi-parameter bifurcation analysis on a typical power system model with the Waive aggregated load mode using AUTO97, a general nonlinear analysis software.The results indicate that the method by multi-parameter bifurcation analysis is superior to that by single-parameter in discovering the influences of system- parameters on voltage stability of power system. The results imply that a higher reference voltage(Vref) and a bigger exciter-gain(KAVR)can increase the power transmission limit of the system, and decrease the possibility of voltage collapse caused by system voltage oscillate without the limit of the excitation. The analysis also indicate that there is a complementary relation between Vref and /TAVR, thus adjusting KAVR and Vref 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.