Nonlinear minimax steam valve switching controller design for power systems

For the turbine speed governor system with input constraints, the nonlinear large disturbance attenuation switching control scheme is investigated based on the backstepping method for the single-machine steam valve system. Backstepping controller avoids linearizing model of the system, and makes the controller more accurate. For power interference, short circuit and so on. Minimax makes the system more quickly suppression the interference and more accurate return to equilibrium, which does not estimate the upper bound of the disturbance or make inequality scaling. The problem of the control input constraints is solved via introducing the switching mechanism. Simulation results for the single-machine steam valve system show that the control scheme can effectively improve the dynamic characteristics of the power system.