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A moving average smoother to improve the accuracy of impedance based protection

Traditional protective relays work based on a frequency domain since many decades ago. Over the last decades, the fundamentals of a Discrete Fourier Transform (DFT) have shown fair performance when computing the signals before entering a protection algorithm. However, modern power systems integrate...

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Bibliographic Details
Main Authors: Celeita, David, Petit, Marc, Le, Trung Dung, Hmaidouch, Amine
Format: Conference Proceeding
Language:English
Subjects:
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Summary:Traditional protective relays work based on a frequency domain since many decades ago. Over the last decades, the fundamentals of a Discrete Fourier Transform (DFT) have shown fair performance when computing the signals before entering a protection algorithm. However, modern power systems integrate complex elements that may affect the response of a trip under particular faults. This research addresses the problem of the phasor computing of a traditional relay. The problem is identified specifically with the selectivity and the accuracy of zone detection for an impedance based protection. A novel moving average module is proposed and assessed with playback simulation and further development of a prototype in a Digital Signal Processor (DSP) for the industrial development of relays. The contribution is focused on the better accuracy of zone detection, including higher selectivity with a low impact on the protection speed.
ISSN:2158-4907
DOI:10.1109/ICPS51807.2021.9416633