Fuzzy PID Control Method For The Excitation Of Synchronous Generator Based On T-S Model

Stability of synchronous generator is one basic factor for the security and economical operation of the power system. To realize stable operation of synchronous generator, utilization of modern control theory and improvement of excitation control are effective measures. Researches on utilization of control technology based on the status and existing devices of our power industry to maximize the stability of the system has become an important topic.This paper firstly gave an introduction to the theory and phylogeny of synchronous generator excitation control, and the mathematical model of excitation system. Designed a 80C196KC SCM system as the parallel self-excitation controller for the three-phase controlled bridge rectifier. Utilization of 80C196KC's specific PTS A/D method on AC signal sampling, has simplified peripheral circuit and improved its reliability; frequency-track circuit in data collection made the ac sampling interval follows the variation of source's frequency to realize symmetrical sampling in high precision.The control algorithm combines PID method and fuzzy logic method, and designs a fuzzy PID controller, compared it with ordinary PID method in MATLAB/SIMULINK, result has proved its superiority in dynamic performance and anti-disturbance ability. Use T-S model to improve system's robustness, and modulate the excitation online. The ripeness of PID facilitated the establishment of fuzzy control formula and the modulation of parameters, the physical meaning is more legible. Better robustness of excitation control improves the performance of the synchronous generator.Compared the fuzzy PID with the fuzzy PID controller based on T-S model, the obtained experimental results are presented and discussed to prove the effectiveness of the new control strategy.