H. Du et Ga. Dumont, CONSTRAINED MULTIVARIABLE CONTROL OF A WOOD CHIP REFINER - TRANSFER SCREW SPEED ADJUSTMENTS LINKED TO DESIGN FLEXIBILITY, Pulp & paper Canada, 99(8), 1998, pp. 47-50
This paper presents the design of a constrained multivariable adaptive
controller for a wood chip refiner in the thermomechanical pulping (T
MP) process. The control algorithm is based on Generalized Predictive
Control (GPC) with consideration for the constraints on process variab
les. The control objective is to maintain two output variables - refin
er motor load and blow-line consistency - at their setpoints by adjust
ing three manipulated variables: transfer screw speed, refiner hydraul
ic pressure and dilution flow-rate. Computer simulations are presented
to demonstrate the advantages of the proposed control algorithm.