Dual Parameter Control of Drum Boiler using Formula-Based Fuzzy Controller

Abstract

Formula-based fuzzy control has gained substantial importance over the last few decades in the precise control of complex processes. Such a control strategy achieves better control performance by revealing the underlying analytical structure of a fuzzy controller. Furthermore, in the design of industrial fuzzy logic controllers only triangular, trapezoidal membership functions are used extensively. This paper presents the design and implementation of a dual formula-based fuzzy PI controller used to control the pressure inside the drum boiler by regulating the level. The control structure derived here typically uses Gaussian membership functions as input variables and three singleton fuzzy sets as the output variables. When applied for real-time control of the pressure of a highly nonlinear drum boiler pilot plant, the proposed controller demonstrates the effectiveness of the controller. The drum boiler pressure control process efficiently responds to the proposed controller for both set-point tracking and load disturbances rejection mode.