Analysis And Control For Electric Power System Nonlinear Dynamical Behavior

The research of analysis and control for electric power system nonlinear dynamical behavior consists of the bifurcation and chaos phenomena in electric power systems, and the mechanism of nonlinear oscillation, sub synchronous resonance and voltage collapse, and the control strategies for the bifurcation and chaos to ensure power system stability, which has become the research hotspot of power system stability and control.On the base of summarizing recent work in analysis and control for electric power system dynamical behavior, this dissertation analyses the bifurcation and chaos phenomena in electric power systems, and proposes corresponding control strategies. Designing of nonlinear controllers for some devices which can eliminate or restrain the bifurcation and chaos phenomena has been developed. The main contents and results in this dissertation are as follows:1. The stability control law for a class of uncertain continuous chaotic systems combining the state observer with the nonlinear H robust controller has been designed. The controller has robustness to outside disturbance in which the system state variables can not be all measured. The controller based on multi-variable adaptive backstepping method has been designed for uncertain parameter chaotic systems. Computer simulation results illustrate the validity of the controllers.2. Combining adaptive control law with nonlinear feedback control, Hopf bifurcation controller has been developed for uncertain parameter systems. The maximal characteristic of this controller is that it is irrelevant to the parameter of the system and can eliminate Hopf bifurcation.3. The condition that power system emerges chaotic oscillation under periodic load perturbation has been developed by Melnikov method. The controllers have been designed to stabilize the power system by means of inverse system method, adaptive backstepping control method and optimal adaptive control method respectively.4. With linear feedback control method, the static bifurcation controller for simple power system has been designed to eliminate SNB. The condition that Hopf bifurcation occurs in Single Machine Infinite Busbar Power System with AVR (Automatic Voltage Regular) has been found. The ways to design Hopf bifurcation controller have been...