Journal of Modern Power Systems and Clean Energy

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Home > Archive>Volume 13, Issue 3, 2025 >815-826. DOI:10.35833/MPCE.2024.000138
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Adaptive Single-end Protection for DC Grid with Dedicated Metallic Return Based on Transient Mean Value of Current Limiting Reactor Modal Voltage
Author:
Affiliation:

1.College of Electrical Engineering, Sichuan University, Chengdu, China;2.State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing, China

Fund Project:

This work was supported in part by the Joint Funds of the National Natural Science Foundation of China (No. U22B6006), the National Natural Science Foundation of China (No. 52207126), and Natural Science Foundation of Sichuan Province (No. 2023NSFSC0296).

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    Abstract:

    In a DC grid with dedicated metallic return (DMR), the coupling effects among the positive pole, negative pole, and DMR conductors must be considered, which makes fault identification particularly difficult. In addition, the identification of high-impedance faults remains a major challenge for DC grid protection. To address these issues, this study proposes an adaptive single-end protection method for DC grid based on the transient mean value of the current limiting reactor (CLR) modal voltage. First, a fault analysis model of the DC grid with DMR is established using the Clarke transformation. The characteristics of CLR modal voltage are then clarified. A fault pole-selection method based on a novel modulus phase plane is next proposed. A threshold scaling factor based on the differential of DC bus voltage is then constructed to enhance the sensitivity and rapidity of the protection, which can adaptively modify the threshold according to the fault severity. Finally, a simulation model of a four-terminal DC grid with DMR is developed in PSCAD/EMTDC. The speed and reliability of the proposed protection method are verified by simulations and experiments.

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History
  • Received:February 05,2024
  • Revised:June 03,2024
  • Online: May 27,2025

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