A Nonlinear Voltage Regulator With One Tunable Parameter for Multimachine Power Systems

Gurrala, Gurunath and Sen, Indraneel (2011) A Nonlinear Voltage Regulator With One Tunable Parameter for Multimachine Power Systems. In: IEEE TRANSACTIONS ON POWER SYSTEMS, 26 (3). pp. 1186-1195.

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Abstract

This paper proposes a nonlinear voltage regulator with one tunable parameter for multimachine power systems. Based on output feedback linearization, this regulator can achieve simultaneous voltage regulation and small-signal performance objectives. Conventionally output feedback linearization has been used for voltage regulator design by taking infinite bus voltage as reference. Unfortunately, this controller has poor small-signal performance and cannot be applied to multimachine systems without the estimation of the equivalent external reactance seen from the generator. This paper proposes a voltage regulator design by redefining the rotor angle at each generator with respect to the secondary voltage of the step-up transformer as reference instead of a common synchronously rotating reference frame. Using synchronizing and damping torques analysis, we show that the proposed voltage regulator achieves simultaneous voltage regulation and damping performance over a range of system and operating conditions by controlling the relative angle between the generator internal voltage angle delta and the secondary voltage of the step up transformer. The performance of the proposed voltage regulator is evaluated on a single machine infinite bus system and two widely used multimachine test systems.

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/40459

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