Adaptive control for the superheated steam temperature based on multi-model state observer

Based on the characteristics of superheated steam temperature of a boiler, a new cascade control system is designed. The main regulator adopts multi-model observer control, and the secondary controller adopts weighted synthesizing proportional control. The system integrates the characteristics of the multi-model control with those of the state variable control with observer, and the state observer has dual functions, providing internal information of the process and acting as the identification model. The result of simulation shows that the control system has powerful robustness with the load changing in large range state variable.