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Double-thyristor based protection for valve-side single-phase-to-ground faults in HB-MMC based bipolar HVDC systems

Li, Gen, Liu, Wei, Joseph, Tibin, Liang, Jun and Song, Ziming 2020. Double-thyristor based protection for valve-side single-phase-to-ground faults in HB-MMC based bipolar HVDC systems. IEEE Transactions on Industrial Electronics 67 (7) , pp. 5810-5815. 10.1109/TIE.2019.2931502

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Abstract

The valve-side single-phase-to-ground (SPG) faults in the half-bridge modular multilevel converter (HB-MMC)-based bipolar high-voltage direct-current (HVdc) systems induce some special fault consequences: overvoltage on the submodule (SM) capacitors in converter upper arms and nonzero-crossing currents in the grid-side ac circuit breaker (ACCB). In this letter, a protection strategy based on converter-embedded double-thyristors is proposed to address these issues. The double-thyristors are installed in parallel with each SM in the lower arms of the converter. By triggering the double-thyristors, the SPG fault is converted into a three-phase short-circuit that ensures current zero-crossings in the grid-side ACCB. Moreover, as the voltages of converter ac buses are clamped by the ground through the triggered double-thyristors, the upper arm overvoltage is mitigated. The effectiveness of the proposed protection strategy has been verified in a bipolar HB-MMC HVdc link built in PSCAD/EMTDC.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0278-0046
Date of First Compliant Deposit: 29 July 2019
Date of Acceptance: 12 July 2019
Last Modified: 24 Sep 2020 10:23
URI: http://orca.cf.ac.uk/id/eprint/124577

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