New Design Nonlinear Control for Excitation Synchronous Generator

Synchronous generator Loss of Excitation (LOE) if dose not detected rapidly; not only has a harmful affect on the generator, but also has a devastating impact on power system stability. In this paper, a new observer-based nonlinear controller for excitation control of synchronous generator is presented. First, a nonlinear sliding mode observer for the synchronous machine damper currents is developed. In modern generators the exciters are static. Then, the existence of a control law for the complete seventh order model of a generator, which takes into account the stator dynamics as well as the damper effects, is proved by using the theory of Lyapunov. Simulation results, for a single-Machine-Infinite-Bus (SMIB) power system, are given to demonstrate the effectiveness of the proposed combined obsever-controller for the transient stabilization and voltage regulation.

Keywords:

Lyapunov stability , nonlinear control , excitation control , synchronous generator