Co-ordinated H∞ control of excitation and governor of hydroturbo-generator sets: A Hamiltonian approach

Abstract

This paper presents a co-ordinated H∞ controller design of excitation and governor of hydroturbo-generator sets, which is on the basis of the port-controlled Hamiltonian (PCH) method. Firstly, the dissipative Hamiltonian realization is achieved via static state feedback, and sequentially the Hamiltonian controller is obtained based on the theory of PCH system with dissipation. Such control strategies fully consider the inherent nonlinearities and non-minimum phase characteristic of the system dynamics, including the rigid water-hammer phenomenon. Furthermore, the property of disturbance attenuation of this controller is revealed in the sense of H∞. The selection of the disturbance attenuation level and the corresponding feedback gain is discussed as well. Then the effects of control input constraints are analysed, sequentially, applied to design the co-ordinated H∞ saturating control of the considered system. Finally, digital simulations that performed on a one-machine, infinite-bus (OMIB) system have verified the effectiveness of the proposed co-ordinated controllers. Copyright © 2004 John Wiley & Sons, Ltd.