A new adaptive backstepping method for nonlinear control of turbine main steam valve

Abstract

A new approach for nonlinear adaptive control of turbine main steam valve is developed. In comparison with the existing controller based on “classical” adaptive backstepping, this method does not follow the classical certainty-equivalence principle in the design of adaptive control law. We introduce this approach, for the first time, to power systems and present a novel parameter estimator and dynamic feedback controller for a single machine infinite bus (SMIB) system with steam valve control. This system contains unknown parameters such as reactance of transmission lines. Besides preserving useful nonlinearities and the real-time estimation of uncertain parameters, the proposed approach possesses better performances with respect to the response of the system and the speed of adaptation. The simulation results demonstrate that the proposed approach is better than the design based on “classical” adaptive backstepping in terms of properties of stability and parameter estimation, and recovers the performance of the “full-information” controller. Hence, the proposed method provides an alternative for engineers in applications.