NDLI: An Enhanced LQ Adaptive VAR Unit Controller for Power System Damping

Content Provider	IEEE Xplore Digital Library
Author	Smith, J. R. Pierre, D. A. Rudberg, D. A. Sadighi, I. Johnson, A. P. Hauer, J. F.
Copyright Year	1981
Abstract	Static VAR compensators have been installed in power systems primarily to function in the steady state regulation of voltage levels or reactive power flows. More recently however there has been much interest in utilizing these devices to improve the dynamic performance of power systems. This paper presents an adaptive linear quadratic Gaussian control strategy for static var systems to enhance power system damping and stability. The control strategy uses only local information to dampen oscillatory modes present in the network. The controller calculates an appropriate value of VAr unit susceptance to present to the network at each sampling instant. The calculation of the appropriate susceptance value is based on a reduced-order model of the power system which is obtained on-line by a least squares identification procedure. The controller consists of three main components: an identifier, an adaptive observer, adn an adaptive LQG regulator. The identifier users a recursive least squares type of algorithm to fit a linear, discrete transfer function model to a sequence of input and output signals obtained from the power system. This results in a reduced-order approximation to the actual power system. For this study, VAr unit susceptance is used as the input signal and bus frequency deviation is used as the output signal. The coefficients of the identified transfer function are then sent to both the adaptive observer and the adaptive regulator. The observer is an observable-cannonical representation of the system and it calculates a state vector representing system dynamics.
Starting Page	42
Ending Page	43
Page Count	2
File Size	427939
File Format	PDF
ISSN	02721724
Volume Number	9
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-05-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Programmable control Adaptive control Reactive power Power system control Control systems Power systems Damping Power system dynamics Power system stability Power system modeling
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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