NDLI: Delay-dependent stability for load frequency control with constant and time-varying delays

Content Provider	IEEE Xplore Digital Library
Author	Jiang, L. Yao, W. Wen, J.Y. Cheng, S.J. Wu, Q.H.
Copyright Year	2009
Description	Author affiliation: Electric Power Security and High Efficiency Lab, College of Electrical Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China (Yao, W.; Wen, J.Y.; Cheng, S.J.) \|\| Department of Electrical Engineering & Electronics, University of Liverpool, Liverpool, L69 3GJ, UK (Jiang, L.; Wu, Q.H.)
Abstract	Load frequency control (LFC) requires transmission of remote measurements to the control center and of control signals from the control center to the plant. Constant delays exist in the dedicated communication channel and an open communication network introduces time-varying delays. Those delays would degrade the dynamic performance of LFC and even cause instability. This paper investigates the delay-dependent stability of the LFC scheme by adopting a delay-dependent criterion and linear matrix inequalities (LMIs). The maximal delay time which allows a power system with a LFC scheme embedded to retain stable is defined as the delay margin for stability analysis. A proportional-integral (PI) controller using the area control error (ACE) as input signal is employed in the LFC scheme. Special attention is paid to the relationship between the gains of PI controller and the delay margin. Case studies are carried out based on one-area and two-area LFC schemes to demonstrate the effectiveness of the criterion. Both constant and time-varying delays are considered. Moreover, the accuracy of the criterion used is also verified by simulation studies.
Starting Page	1
Ending Page	6
File Size	1077614
Page Count	6
File Format	PDF
ISBN	9781424442416
ISSN	19449925
DOI	10.1109/PES.2009.5275834
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency control Communication system control Power system dynamics Power system stability Delay effects Pi control Proportional control Frequency measurement Communication channels Communication networks time-varying delay Delay-dependent stability load frequency control delay margin
Content Type	Text
Resource Type	Article

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