Estimation Methods of Short Circuit Current Using Normal PMU Measurements and Field Testing |
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Authors: | Suresh Chand Verma Yoshiki Nakachi Yoshihiko Wazawa Yoko Kosaka Takenori Kobayashi Kazuya Omata Yoshiki Takabayashi |
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Affiliation: | 1. Research and Development Division, Chubu Electric Power Co., Inc., Japan;2. Power System Operations Department, Chubu Electric Power Co., Ltd., Japan;3. Power and Industrial Systems R&D Center, Toshiba Corp., Japan;4. Transmission & Distribution Systems Division, Toshiba Corp., Japan |
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Abstract: | This paper proposes estimation methods for short circuit currents using phasor measurement unit (PMU) measurements (phasors). The methods follow the basic notion of representing the source side of a power system by an equivalent circuit with a voltage behind a back impedance, and employ a set of voltage and current phasors measured at substations during the normal variation of loads in their estimation. In order to improve the estimation accuracy of the proposed methods, the concept of using the changes between consecutive phasors is introduced. Furthermore, to make the methods applicable to a real‐world system, the concept of a reference phasor, used to remove the effects of system‐wide frequency variations and a filtering process to filter out the outlier phasors, is proposed and implemented. The validity and effectiveness of the proposed methods were checked and confirmed through experiments and field tests. |
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Keywords: | phasor unit measurement (PMU) analog simulator outlier filter power system monitoring short circuit current |
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