Study on boiler-turbine coordinated system of power unit using observer backstepping approach

A coordinated control approach based on the observer backstepping is presented. The backstepping controllers of the boiler and turbine are designed respectively: the observer of the controlled object is constructed firstly, and then the observer backstepping is designed and make the control system satisfy Lyapunov stability. The coordinated control system considers the coupling of boiler and turbine as disturbances, so the decoupling compensation is needn´t. The coupling influences of the variables are inhibited by the backstepping controllers, and the unit plant can be effectively controlled. Simulation results show the effectiveness and robustness of the approach.