Fuzzy-PID controller based on variable universe for main steam temperature system

ABSTRACT The high inertia and long delay characteristics of main steam temperature control system in the thermal power plants will reduce the system control performance. In order to improve the control performance, a Fuzzy-PID control strategy based on variable universe for main steam temperature system is proposed. Variable universe method is adopted to solve the local parameters self-regulation optimisation problem of conventional PID controller. Variable universe guarantees that the parameters of the system are global optimal. It solves the problem that the fuzzy controller cannot guarantee the high accuracy under the given rules. The scale factor is chosen according to fuzzy rules. The advantages of variable universe and Fuzzy-PID are combined. Fuzzy-PID controller based on variable universe is established. Compared with other control methods, the simulation experiments are carried out. Simulation results show that Fuzzy-PID controller based on variable universe has faster response speed, smaller overshoot and error, better tracking performance and reduces the lag effect of the control system.

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