FUZZY SELF-ADAPTING PID CONTROL OF DRUM WATER LEVEL IN A POWER PLANT

To improve the control quality of conventional PID controller used in complex control system, a new design strategy of fuzzy-PID controller is proposed. The tuning method based on the specified phase and gain margin is proposed to determine the parameters of the new fuzzy PID controller. Using fuzzy inference methods, the Fuzzy PID parameters can be adaptively adjusted on line for varying state of the system and changing operating condition. The strategy, which is implemented based on the Function Code on many typical Distributed Control System (DCS). The industrial application results show that many complex control system that uses this design strategy can effectively reduce the debugging time and has better control performance.