Start-up strategy for modular multilevel converters with modified nearest level modulation method

Liu, Wei, Li, Gen ORCID: https://orcid.org/0000-0002-0649-9493, Ugalde-Loo, C.E. ORCID: https://orcid.org/0000-0001-6361-4454 and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 2019. Start-up strategy for modular multilevel converters with modified nearest level modulation method. Presented at: 8th Renewable Power Generation Conference (RPG 2019), Shanghai, China, 24-25 October 2019. 8th Renewable Power Generation Conference (RPG 2019). IET, 10.1049/cp.2019.0473 Item availability restricted.

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Abstract

A specific issue associated with modular multilevel converters (MMCs) is that the sub-module (SM) capacitors need to be pre-charged to their rated voltages. Otherwise, voltage mismatches could cause large in-rush currents at the ac and dc-sides of an MMC. This shortcoming should be avoided for both the start-up and post-fault restart processes. However, it normally takes a long time to pre-charge the capacitors using open loop methods. To bridge this gap, this paper presents a start-up strategy for MMCs. To speed up the start-up process and eliminate in-rush currents, a modified nearest-level modulation method is presented. The presented strategy does not require extra measurements and is feasible for both half-bridge and full-bridge based MMC topologies. For completeness, the effectiveness of strategies is verified by simulations conducted in PSCAD/EMTDC.

Item Type:	Conference or Workshop Item (Paper)
Status:	Published
Schools:	Engineering
Publisher:	IET
ISBN:	9781839531255
Date of First Compliant Deposit:	21 January 2021
Date of Acceptance:	23 July 2019
Last Modified:	11 Mar 2023 02:56
URI:	https://orca.cardiff.ac.uk/id/eprint/137868

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