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
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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: | 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 |
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