Sliding mode control for ball mill load based on prescribed performance

Abstract

To solve the problem of mill current fluctuations caused by sudden input changes in the cement combined grinding system, this paper built a mathematical model of the ball mill load and designed a sliding mode control for ball mill load based on prescribed performance. The prescribed performance formula is introduced into the controller to guarantee the error of mill current can quickly astrict according to the preset curve. Next, the sliding mode surface of mill current error is defined and controller is solved. Through simulation, and by comparing with model-free adaptive sliding control strategy, the designed control strategy can stabilize mill current, reduce adjustment time, and the effectiveness and robustness are verified.