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

Li, Gen ORCID: https://orcid.org/0000-0002-0649-9493, Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X, Ma, Fan, Ugalde Loo, Carlos E. ORCID: https://orcid.org/0000-0001-6361-4454 and Liang, Haifeng ORCID: https://orcid.org/0000-0001-7511-449X 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

Preview

PDF - Published Version Available under License Creative Commons Attribution. Download (2MB) | Preview

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:	07 May 2023 00:57
URI:	https://orca.cardiff.ac.uk/id/eprint/121955

Citation Data

Cited 4 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item