磨煤机模糊自整定PID控制器的设计和仿真

Design and Simulation of Fuzzy Self-tuning PID Controller for Ball Mill

磨煤机的载煤量的测量一直是磨煤机控制系统中的一个难题,已有的差压法、音频法、振动法等都无法保证其测量精度。对此提出在磨煤机出口增加煤粉浓度测量装置来辅助判断磨煤机内部载煤量的方法,可以有效地提高磨煤机载煤量的测量精度。另外,针对磨煤机非线性、大延迟和模型时变特性,提出了模糊自整定PID控制策略,来提高磨煤机运行的安全性和经济性。Matlab仿真结果表明,新系统比采用目前常规的磨煤机控制系统具有更优越的性能。

Fuzzy self-tuning PID controller strategy is put forward and fuzzy control rule is designed for ball mill to adapt to the non-liner, long time delay and varying quality. The parameter Kp, Ki, Kd is adjusted through identifying the error and its variety rate. According to the simulation result, this controller obviously improved the performance.