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

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

Abstract

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
• DOI: https://doi.org/10.1016/s0142-0615%2801%2900028-x
• Keywords: Multi-input multi-output, Structured singular values, Decentralised load frequency control
• Public URL: http://researchrepository.napier.ac.uk/Output/2879278