A new decentralised controller design method with application to power-system stabiliser design

• Published in: Control engineering practice Vol. 7; no. 4; pp. 537 - 545
• Main Authors: Yang, T.C., Zhang, J.H., Yu, H.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.1999
• Subjects: Decentralised control; Large-scale systems; Power systems; Decentralised control; Large-scale systems; Power systems
• ISSN: 0967-0661; 1873-6939
• DOI: 10.1016/S0967-0661(99)00014-3

It is known that decentralised stabilising controller design for a large-scale system can be translated into an equivalent problem of decentralised controller design for a multi-input multi-output (MIMO) control system. This paper shows that, subject to a condition based on the structured singular values, each local controller can be designed independently. The stability condition for the overall system can be easily stated as the achievement of a sufficient interaction margin, introduced in earlier work, together with a sufficient gain and phase margin, defined using classical feedback theory during each independent design. The suggested design approach is applied to the decentralised design of a power-system stabiliser for a model of a practical 10-machine power system. The potentials and limitations of the suggested design approach in its current form, and possibilities for further research, are also discussed in this paper.