Pressure equilibrium control for boiler-turbine units

Abstract

An equilibrium control structure for boiler-turbine units is presented in this paper to restrict the exceeding change of steam pressure. The central component of this structure is named as “Steam Pressure Equilibrium Controller”, which is composed with two parts: the pressure error compensator and the pressure set-point optimizer. The former is designed to regulate the change rate and directions of load demand under certain rules according to the steam pressure error. The latter is designed to change the set-point of steam pressure in a reasonable range if the aberrance of steam pressure is serious. Simulation results show that the proposed control structure has good performance for pressure error control.