Immersion and invariance-based nonlinear dual-excitation and steam-valving control of synchronous generators

This paper focuses on designing the nonlinear dual-excited and steam-valving control of synchronous generators to enhance the system stability and voltage regulation of an electrical power system. Based on the concept of immersion and invariance technique, the resulting nonlinear controller is used to not only achieve power angle stability, frequency, and voltage regulation but also ensure that the closed-loop system is transiently and asymptotically stable. In order to show the effectiveness of the proposed controller design, numerical simulation results are provided to illustrate the performance of the proposed controller capable of keeping the system transiently stable and simultaneously accomplishing the system stability and voltage regulation improvement in spite of large disturbances and network changes. Copyright (c) 2013 John Wiley & Sons, Ltd.