Stabilization control for multimachine system using decentralized H_∞ excitation controller realizing terminal voltage control and damping control

Abstract

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

A study of multivariable supplementary power system stabilizers

“…However, these controllers are not favored by the utilities since it is believed that any failure of these kinds of controllers will leave the power system totally uncontrolled. The other methodology deals with designing a multivariable controller that provides additional supplementary control signals to the synchronous machine equipped with its conventional control loops [3], [4].…”