Study On Synchronous Generator Fuzzy Self-Regulating PID Excitation Control Strategy

Synchronous generator excitation control plays a very important role in the operation of power system. With generator unit capacity and the scale of transmission-line system of electric power becoming larger and larger, higher and higher standard demands are made on reliability and dynamic quality of excitation control for generating set and electric power system. In company with control theory becomes prefer, excitation control technology makes progress constantly in practice and theory.At present, scholars at home and abroad combine the PID control with fuzzy control belong to intelligence control theory, exploit to the fully their favourable conditions and avoid unfavurable ones, and develop multifold fuzzy PID excitation controllers. However, the general fuzzy controller can't adapt the system parameters because the controller factors can't be changed once seted. Therefore, the fuzzy controller needs further improved.The development and actuality of synchronous generator excitation control law is analysed in this thesis. Based on the fuzzy control theory and PSO algorithm theory, a kind of fuzzy self-regulating PID excitation control strategy is put forwarded with time change quality and nonlinearity of controlled plant is considered. Then, a kind of fuzzy self-regulating PID excitation controller is designed with advantage of fuzzy control with that of PID control combined, which is characterized by simpleness and high accuracy of PID control and good adaptability and speedability of fuzzy control. Quantizing factor and proportional factor of fuzzy self-regulating PID excitation controller are optimized by improved PSO algorithm, accordingly, the fuzzy control rules are self-adjusted and become perfect. The simulation research is carried out, and the results indicate that the excitation controller designed in this thesis has better controlling effect than the general PID excitation controllers do. In the end, stability analysis of the fuzzy self-regulating PID excitation control system is analysed and the sufficient stable conditions of the excitation control system are obtained.