Fuzzy Tuning PID Control of the Rolling Mill Main Drive System

Abstract

The main drive system using for four-high mill is usually a double closed loop DC motor speed regulating system. Generally, the speed controller and current controller are PID controllers, and the parameters of controllers are determined by the engineering design method. Once disturbance occur, the control effects are often just passable. In this paper, fuzzy logic is used to set the parameters of the speed PID controller, so as to improve the disturbance rejection ability. Simulation results show that the fuzzy tuning PID controller can give better control effect than the regular control.

Development of the method for joint operation of neural-network tuners for current and speed

“…The subject of present study is the system of control over motion speed of a two-high reversing rolling mill. Roughing rolling stands belong to sophisticated non-linear metallurgical aggregates whose parameters can change during operation [1,2]. The systems of control over given units widely employ direct current electric drives and Pand PI-controllers with constant parameters.…”

“…Such systems are built using the principles of subordinate regulation [3,4], according to which the two control circuits are synthesized: an external circuit to control rotation frequency of the electric motor and the internal circuit to control current of the anchor. Applying the specified linear controllers leads to the deterioration in quality of transition processes under conditions of changing modes of operation [1,2]. Specifically, parameters of the armature winding and mechanical part can change in the examined drive.…”