An adaptive fault current limiting control for MMC and its application in DC grid

Ni, Binye and Xiang, Wang and Zhou, Meng and Zuo, Wenping and Yao, Wei and Lin, Weixing and Wen, Jinyu (2020) An adaptive fault current limiting control for MMC and its application in DC grid. IEEE Transactions on Power Delivery. ISSN 0885-8977 (https://doi.org/10.1109/TPWRD.2020.2997089)

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Abstract

This paper proposes an adaptive fault current limiting control (AFCLC) for modular multilevel converters (MMC). Without introducing extra current limiting devices, this control scheme enables fast fault current suppression during DC faults. The AFCLC will be triggered automatically once DC faults occur. By adaptively reducing the output DC voltages of MMCs, the fault current can be suppressed. Compared with the existing current limiting methods, the proposed AFCLC has a better performance on fault current limiting, since it only depends on the real-time operating condition and no fault detection delay is imposed. Firstly, the principle of the proposed AFCLC together with the mathematical analysis is disclosed. Then, the sensitivity analysis of the impact of key control parameters on the current limiting effect is investigated. Finally, the effectiveness of AFCLC is demonstrated in a four-terminal HVDC grid test model. The simulation results show that the proposed AFCLC can reduce the interrupted current and energy absorption of a DCCB from 10.39 kA and 38.24 MJ to 4.62 kA and 8.32 MJ, respectively. The simulation results also prove that the AFCLC will not affect the accuracy of the DC fault detection algorithms under DC faults.

  • Item type:Article
    ID code:72747
    Dates:
    Date
    Event
    25 May 2020
    Published
    25 May 2020
    Published Online
    21 May 2020
    Accepted
    Notes:© 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:16 Jun 2020 10:07
    Last modified:09 Apr 2024 01:33
    URI:https://strathprints.strath.ac.uk/id/eprint/72747
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