Study and Design of Self-Adaptive Pid-Fuzzy Control on Multistage Steam Turbine Rotation Setting

The multistage steam turbine system is composed of high pressure turbines, medium pressure, and low pressure. The system response with turbine rotational speed has an integrator tendency. When using the PID controller on closed loop, the response has high overshoot, fast and no robust. In order for the system to have one-order response characteristics in the absence of overshoot, and robust capability, innovation of rotational speed settings is made. Then the PID-Fuzzy self-adaptive controller is designed. The PID-Fuzzy controller aims to improve the responses to first order, in particular eliminating overshoots, and improving the dynamic response using the reference model. The self-adaptive controller functions to adapt the controller parameters when the load changes. The existence of the maximum load, nominal, and minimal and then varied with the load up, down, and fluctuating. The system response is capable of returning to the 3000rpm setpoint, achieving a steady 99.3% time of 20-47.1 seconds, from simulation RMSE values respectively get 1,151%, 3,278%, and 4,058%.