Decentralized voltage control in multiarea power system

Noriyuki Iwase*, Kenji Okada, Keiichiro Yasuda, Ryuichi Yokoyama

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    This paper discusses the feasibility of a decentralized voltage control scheme for large-scale power systems. The algorithm is intended to apply to a reactive normal operating state from an emergency state caused by ill-condition and also to keep the operating state away from approaching unstable boundaries in preventive control. The procedure for releasing voltage deviation (over/under voltage) is formulated as a multistage decision process over a certain time interval. The optimization problem is transformed into a two-point boundary value problem using the discrete maximum principle and is solved easily by using the discrete Riccati equation. For a large-scale power system, control values must be computed from a large number of state variables, and this inevitably prolongs the slow dynamics with controllers. The centralized control system in a large-scale system cannot be justified from the economical and technical viewpoints. To resolve the foregoing problems, a decentralized voltage control system incorporating slow voltage dynamics is presented.

    Original languageEnglish
    Pages (from-to)43-51
    Number of pages9
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Issue number1
    Publication statusPublished - 1993 Feb

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering


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