Robust nonlinear coordinated control of power systems

doi:10.1016/0005-1098(95)00186-7

Automatica

Volume 32, Issue 4, April 1996, Pages 611-618

https://doi.org/10.1016/0005-1098(95)00186-7 Get rights and content

Abstract

To prevent an electric power system losing synchronism under a large sudden fault and to achieve voltage regulation are major objectives in power system design. This paper applies the Riccati equation approach, together with the direct feedback linearization (DFL) technique, to design robust nonlinear controllers for transient stability enhancement and voltage regulation of power systems under a symmetrical three-phase short circuit fault. A DFL excitation controller and a DFL coordinated controller (excitation and fast valving controller) are proposed. The simulation results show that a power system can keep transiently stable, even when a large sudden fault occurs at the generator terminal. The robust nonlinear DFL controllers proposed here can greatly improve transient stability and achieve voltage regulation.

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Citation Excerpt :
But the excitation and hydro-governor controllers, are developed based on differential geometric theory and the problem of voltage regulation has not been investigated. It has been shown in [19] that a robust coordinated excitation and steam valve control produce better results when a large fault occurs close to the generator terminal. However, DFL is used and the coordination between the two control laws is done using a switching algorithm which causes a discontinuity of system behavior.
This paper presents a decentralized coordinated excitation and steam valve adaptive control combined with a high-order sliding mode differentiator. The aim is to obtain high performance for the terminal voltage and the rotor speed simultaneously under a sudden fault and a wide range of operating conditions. The methodology adopted is based on second order sliding mode technique using the supper twisting algorithm. The proposed scheme requires only local information on the physically available measurements of relative angular speed, active electric power and terminal voltage with the assumption that the power angle and mechanical power input are not available for measurement. It can be implemented locally and dispersedly for individual generators and is convenient for industrial applications. Simulation results in the case of the Kundur 4-machines 2-area power system show the effectiveness, robustness and superiority of the proposed scheme over the classical AVR/PSS controller and steam valve PI regulator.

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^☆: This paper was not presented at any IFAC meeting. This paper was recommended for publication in revised form by Associate Editor Hassan Khalil under the direction of Editor Tamer Başar.

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Brief paperRobust nonlinear coordinated control of power systems☆

Abstract

Automatica

Automatica

Stabilizing a multimachine power system via decentralized feedback linearizing excitation control

IEEE Trans. Power Syst.

A pole-placement design approach for systems with multiple operating conditions

A new class of fast nonlinear voltage controllers and their impact on improved transmission capacity

Robust stabilization of uncertain linear systems: quadratic stabilizability and H∞ control theory

IEEE Trans. Autom. Control

Brief paper
Robust nonlinear coordinated control of power systems☆

Robust stabilization of uncertain linear systems: quadratic stabilizability and H^∞ control theory