Decentralized PMU-assisted Power System State Estimation with Reduced Inter-Area Communication

N. Kashyap, Stefan Werner, Y. F. Huang

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    In this paper, we present a decentralized approach to hybrid, multi-area power system state estimation, i.e., state estimation using both conventional RTU measurements and newer PMU measurements. We employ a reduced-order approach to hybrid state estimation, wherein the PMU observable and unobservable components of the state vector are estimated separately in each control area. The estimation problem is solved by exchanging information through a gossip-based protocol which takes into account the weak measurement coupling between control areas. A detailed analysis of this protocol reveals that the amount of information exchange is always less than the naive gossip based scheme. We show through simulations on the IEEE 118-bus test system that in practice, the gossip iterations converge in one iteration regardless of the number of control areas. Our simulations also show that the marginal information exchange is also considerably lower when using the proposed method.
    Original languageEnglish
    Pages (from-to)607 - 616
    Number of pages10
    JournalIEEE Journal of Selected Topics in Signal Processing
    Volume12
    Issue number4
    Early online date2018
    DOIs
    Publication statusPublished - Aug 2018
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Information exchange
    • Measurement uncertainty
    • Monitoring
    • Phasor measurement units
    • Power measurement
    • Power systems
    • State estimation
    • Distributed Estimation
    • Multi-Area State Estimation
    • Phasor Measurement Units
    • Reduced-Order

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