Nonlinear process control — once-through boiler

This paper presents the nonlinear control system design algorithm - the localization method - applied to the output superheater of the coal power plant once-through boiler. Theoretical basics of the localization method are shown. Linear and nonlinear models of the superheater were earlier developed. Basic descriptions of these models properties are presented, too. The control of the plant is processed by two control cascades; each of these cascades uses the localization controller and the special element for derivatives evaluating the differentiating filter. Through the research there were the different localization loop configuration developments. Simulation results for these variants of the localization loops are presented.