Nonlinear adaptive control for the turbine steam valve with input constraints
考虑输入约束的发电机汽门非线性自适应控制

We consider the transient stability of a single-machine-infinite-bus system with damping coefficient uncertainties in the turbine steam valve control. The control input constraints are solved by introducing a switched mechanism, the model of which is developed based on the concept of main steam-valve control and the fast-steam-valve control. The nonlinear adaptive controllers and parameter updating laws of the subsystems are also obtained simultaneously using the proposed modified adaptive Backstepping method. Furthermore, a common Lyapunov function of the switched system is constructed to guarantee the stability of the switched system. Since the controller design is based completely on the nonlinear dynamic system without any linearization, the nonlinear property of the dynamic system is well preserved. Finally, the simulation results demonstrate the effectiveness and advantages of the proposed control method.