Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Short-circuit fault detection scheme for DC microgrids on offshore platforms

  • Zhenyu Li (School of Marine Engineering, Jimei University) ;
  • Huiran Sui (School of Marine Engineering, Jimei University) ;
  • Ruifang Zhang (School of Marine Engineering, Jimei University) ;
  • Guoling Wang (School of Marine Engineering, Jimei University) ;
  • Huiyin Cai (Xiamen Institute of Technology)
  • Received : 2022.10.11
  • Accepted : 2023.02.22
  • Published : 2023.05.20
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Abstract

DC microgrids present a very effective solution that enables the power systems of offshore platforms to achieve increased integration of renewable sources. Since the areas of offshore platforms are limited, the associated DC microgrids have lower line impedances, and short-circuit faults cause fault currents to rise rapidly. Thus, fault detection is a challenging issue due to the strict time limits for interruption imposed by these rapid rising fault currents. According to the fault characteristics and the ring structure of DC microgrids, this paper proposes a rapid detection scheme based on the differential current and current derivative without de-energizing the entire DC microgrid. It achieves rapid and selective fault detection and ensures an uninterruptible load power. The synchronization issues of the current differential and a rapid processing method for fault currents are investigated. The tripping threshold settings are discussed. Implementation of the fault detection scheme is also presented in detail. The proposed scheme is verified on a physical experimental platform. It is shown that here are some advantages such as good selectivity, low cost, and rapid fault detection. The scheme provides a strong guarantee for the uninterruptible operation of important equipment on offshore platforms.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation for Young Scholars of China under Grant 51809114; the Natural Science Foundation of Fujian province under Grant 2020J01685; and the Jimei University Foundation under Grant ZQ2020020 and Grant ZP2020006.

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