关键词: 有功功率, 模糊控制, 自适应PID, 水轮机

Abstract:

Due to the large inertia and the water hammer effect of hydraulic turbine, and time-varying nonlinear characteristic of each link of the turbine regulating system, traditional PID controller is found inadequate to improve the control quality and likely to cause high overshoot, long-term oscillation, volatility, hysteretic adjustment. According to these problems, the active power feedback is incorporated into the regulating system to replace the displacement feedback of the main servomotor and a PID parameters controller based on fuzzy control is designed to adjust PID parameters online through expert's reasoning capability of fuzzy control, which can in turn improve the control quality. According to the various operation modes and disturbance situation of the turbine regulating system, simulation of the adaptive fuzzy PID controller model is conducted drawing on the fuzzy logic toolbox. The results show that the system has a better tracking performance, high accuracy, significantly lower overshoot, strong adaptability and robustness. 

Key words: active power, fuzzy control, adaptive PID, hydraulic turbine