Stabilization Control for Multi-Machine Power System using Decentralized H∞ Excitation Controller Realizing Terminal Voltage Control and Damping Control

Abstract

In this paper, to achieve both the damping of power system oscillation and terminal voltage control simultaneously on multi-machine power system, we propose a decentralized H_∞ excitation controller. In the proposed method, H_∞ control via Normalized Coprime Factorization approach are used to achieve the proposed design idea. By the Normalized Coprime Factorization approach, the weighting function in H_∞ control design is simplified, and an output feedback controllers that take into account the realities and constraints of the power systems are designed. The proposed controller is carried out model reduction of H_∞ controllers, and is transformed to discrete system to perform digital control by computer systems in consideration of applying for real system. We verify that the proposed excitation controller can achieve both the damping of power system oscillation and terminal voltage control by computer simulations on a multi-machine power system.