Based On The Robust H_ ¡Þ Control Theory Of Synchronous Generator Excitation Controller

The stability of power system is one of the basic needs of the power system safety operation. Excitation control of generators is one of the most economical and effective measures for the improvement of power system stability. And the stability of power system under large or small disturbances can be obviously improved by adding proper control to the generator excitation. As is well-known, the design oftraditional PID control, PSS(power system stabilizer) and LOEC(linear optimalexcitation control) is based on the approximate linear model around the equilibrium point, so they can only handle the small disturbance problems. Although the nonlinear excitation controller based on Exact Feedback Linearization of differential geometry takes on better traits than the linear control method in the aspect of improving the large disturbances stability, the model is still based on the fixed structure and parameters without considering the uncertainties. In fact, like most engineering systems, the power systems are always affected by the internal or the external disturbances in their operations. Moreover, the inaccurate description of system models, the parameter errors and variable errors measured by transducers, can also be considered as generalized disturbances on power systems. It is very hard to describe these disturbances by differential equations exactly. In order to solve the effect of uncertainties existed in power system, all kinds of robust control strategies are proposed, such as nonlinear I₂-gain control method, H_∞ control and so on.The primary aim of this paper is to study the design of generator excitation controller based on the modern robust control theory, and the gained excitation control law is applied to the single-machine infinite power system to show its effectiveness by simulation. The research contents are as follows: Study of Linear Multi-Variable and PID Excitation Control...