AUTHORS: A. Kanchanaharuthai, E. Mujjalinvimut

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ABSTRACT: This paper focuses on the design of a backstepping-like nonlinear coordinated controller for excitation and static var compensator (SVC) of an electrical power systemto enhance transient stability and voltage regulation after the occurrence of a large disturbance and a small perturbation. Based on this scheme, the developed 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. Besides, the developed design technique is rather simple but effective as compared with an immersion and invariance (I&I) control technique and a traditional backstepping nonlinear design technique. In order to show the effectiveness of the proposed controller design, the simulation results illustrate that in spite of the case where a large perturbation occurs on the transmission line or there is a small perturbation to mechanical power inputs, the proposed controller can not only keep the system transiently stable but also simultaneously accomplish good dynamic properties of the system as compared to operation with the existing nonlinear controllers.

KEYWORDS: Transient stability, backstepping-like nonlinear controller, generator excitation, SVC

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