A Probabilistic Estimation Method of Reactive Power Controlled by PCS using Measurement Data of Switchgears with Sensors

Akira Koide, Takao Tsuji, Tsutomu Oyama, Tadahiro Goda, Yasuhiro Kojima, Takao Shinji, Kenko Uchida, FrÉdÉric MagoulÈs

    Research output: Contribution to journalArticle


    It becomes an important issue to maintain voltage profile within the allowable range in distribution systems with a large number of distributed generators (DGs), such as Photovoltaic (PV). Although reactive power control by power conditioning system (PCS) is effective to mitigate the voltage increase, there is a possibility that active power curtailment is needed to provide enough amount of reactive power due to current limitation. Here, it is expected that the active power curtailment can be avoided if a cooperative voltage control between load ratio tap controller (LRT) and PCS is realized. To this end, system operators have to know the amount of reactive power controlled by PCS. Hence, in this paper, we developed a new state estimation method of the reactive power using the measurement data obtained by the switchgears with sensors. In addition, a probabilistic approach was applied because an accurate estimation is theoretically impossible only by using the limited number of measurement data. The proposed method was tested in a hierarchic distribution system model and its effectiveness was shown through simulations.

    Original languageEnglish
    Pages (from-to)3-18
    Number of pages16
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Issue number4
    Publication statusPublished - 2017 Sep 1



    • distributed generator
    • distribution system
    • state estimation
    • voltage-reactive power control

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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