抄録
Power system is a large dynamic system, which includes a lot of nonlinear elements. According to the nonlinear analyses using the Hopf bifurcation theory, it can be detected that a limit cycle exists around an operating point, which may affect the global stability of power system significantly. The authors have presented a numerical method to analyze the nonlinear characteristics in power systems by observing the power swing after some perturbation where the coefficients of nonlinear terms are determined by the least mean square method. In this paper the method is modified for the application to a longitudinally intercon-nected power system including an excitation system, and the influence of the excitation voltage limiter on the non-linear phenomena of the whole power system can be detected by some numerical analyses.
