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Decentralised power system load frequency control beyond the limit of diagonal dominance

Yang, T.C.; Ding, Z.T.; Yu, H.


T.C. Yang

Z.T. Ding


The design of decentralised robust load frequency control for interconnected multi-area power systems is studied in this paper. It is shown that although the design can be naturally formulated as a large-scale system decentralised control problem, it can be translated into an equivalent problem of decentralised controller design for a multi-input multi-output (MIMO) control system. It is known that simple controllers can be designed to achieve satisfactory performances if diagonal dominance can be achieved in a multivariable system. This is further extended in this paper. Using the design method proposed in this paper, even when the diagonal dominance cannot be achieved, subject to a condition based on the structured singular values (SSVs), each local area load-frequency controller can be designed independently. The robust stability condition for the overall system can be easily stated as to achieve a sufficient interaction margin, and a sufficient gain and phase margin during each independent design.

Journal Article Type Article
Acceptance Date Mar 14, 2001
Online Publication Date Jan 8, 2002
Publication Date 2002-03
Deposit Date Jun 15, 2022
Journal International Journal of Electrical Power & Energy Systems
Print ISSN 0142-0615
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 24
Issue 3
Pages 173-184
Keywords Multi-input multi-output, Structured singular values, Decentralised load frequency control
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