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논문 기본 정보

저자정보
(Daegu Catholic University) (Daegu Catholic University) (Korea Electric Power Corporation Research Institute) (Korea Electric Power Corporation Research Institute) (Daegu Catholic University)
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대한전기학회 전기학회논문지 전기학회논문지 제75권 제10호
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    초록·키워드

    Phasor measurement units (PMUs) provide time-synchronized voltage and current phasors, enabling linear state estimation in rectangular coordinates. This paper evaluates PMU-only linear state estimation for the Jeju power system using its actual PMU measurement channel configuration and proposes an observability-preserving bad-data processing method. Monte Carlo simulations were performed under voltage, current, combined bad-data, and missing-measurement conditions. The proposed observability-preserving selective reweighting and removal method (OP-SRR) was compared with measurement removal and iterative reweighting methods using a weighted least-squares (WLS)-inspired post-processing residual screening index with a fixed threshold. The results show that OP-SRR mitigates estimation instability associated with measurement removal, particularly under combined voltage and current bad-data conditions, while requiring less computation time than iterative reweighting. The missing-measurement case was evaluated under conditions in which observability was preserved.

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