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Analysis of single-phase-to-ground faults at the valve-side of HB-MMCs in HVDC Systems

Li, Gen, Liang, Jun, Ma, Fan, Ugalde Loo, Carlos E. and Liang, Haifeng 2019. Analysis of single-phase-to-ground faults at the valve-side of HB-MMCs in HVDC Systems. IEEE Transactions on Industrial Electronics 66 (3) , pp. 2444-2453. 10.1109/TIE.2018.2829666

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Abstract

Although the probability of occurrence of station internal ac grounding faults in modular multilevel converter (MMC)-based high-voltage direct-current systems is low, they may lead to severe consequences that should be considered when designing protection systems. This paper analyzes the characteristics of valve-side single-phase-to-ground (SPG) faults in three configurations of MMC systems. Fault responses for symmetrical monopole MMCs are first studied. Upper arm overvoltages and ac-side nonzero-crossing currents arising from SPG faults in asymmetrical and bipolar configurations are then investigated. DC grounding using an LR parallel circuit is employed to create current zero-crossings, which will enable the operation of grid-side ac circuit breakers. The theoretical analysis is verified through simulations performed in PSCAD/EMTDC, with simulation results and the theoretical analysis showing a good agreement. The studies in this paper will be valuable for the design of protection systems for station internal ac grounding faults.

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: 26 April 2019
Date of Acceptance: 6 April 2018
Last Modified: 30 Apr 2019 17:47
URI: http://orca.cf.ac.uk/id/eprint/121955

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