Abstract
This paper gives a design of an I-P controller for a pressure control system in a furnace of a thermal power plant boiler. The plant has multivariables, interactions among variables, non-linearity and uncertain time delays. Hence the control performance for this plant would be not good by simply using I-P controllers.
To obtain a good transient property for a reference signal of a plant such as having the interactions among variables, non-linearity and unknown time delays, this paper regards interactions as disturbances, lets the plant approximate to two first-order independent systems having disturbances instead of interactions and uses a self-tuning I-P controller based on an extended generalized predictive control (GPC) which can redesign disturbance response independently to reference response. Expressions of a self-tuning scheme of the I-P controller for two first-order systems are obtained by approximating the I-P controller to the extended GPC method with identified parameters of two first-order systems. Simulation results are given to show effectiveness of the proposed controller.
