Synchronizing and Damping Torques Analysis of Nonlinear Voltage Regulators

Gurrala, Gurunath and Sen, Indraneel (2011) Synchronizing and Damping Torques Analysis of Nonlinear Voltage Regulators. In: IEEE Transactions on Power Systems, 26 (3). pp. 1175-1185.

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Abstract

This paper makes an attempt to assess the benefits of replacing a conventional generator excitation system (AVR + PSS) with a nonlinear voltage regulator using the concepts of synchronizing and damping torque components in a single machine infinite bus (SMIB) system. In recent years, there has been considerable interest in designing nonlinear excitation controllers, which are expected to give better dynamic performance over a wider range of system and operating conditions. The performance of these controllers is often justified by simulation studies on few test cases which may not adequately represent the diverse operating conditions of a typical power system. The performance of two such nonlinear controllers which are designed based on feedback linearization and include automatic voltage regulation with good dynamic performance have been analyzed using an SMIB model. Linearizing the nonlinear control laws along with the SMIB system equations, a Heffron Phillip's type of a model has been derived. Concepts of synchronizing and damping torque components have been used to show that such controllers can impair the small signal stability under certain operating conditions. This paper shows the possibility of negative damping contribution due to nonlinear voltage regulators and gives a new insight on understanding the physical impact of complex nonlinear control laws on power system dynamics.

Item Type:	Journal Article
Publication:	IEEE Transactions on Power Systems
Publisher:	IEEE
Additional Information:	Copyright 2011 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Feedback linearization;power system stabilizers;small-signal stability;transient stability
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	15 Sep 2011 11:06
Last Modified:	15 Sep 2011 11:06
URI:	http://eprints.iisc.ac.in/id/eprint/40458

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