dc.contributor.author | Avdiaj, Eros | |
dc.contributor.author | D'Arco, Salvatore | |
dc.contributor.author | Piegari, Luigi | |
dc.contributor.author | Suul, Jon Are Wold | |
dc.date.accessioned | 2024-02-05T08:09:10Z | |
dc.date.available | 2024-02-05T08:09:10Z | |
dc.date.created | 2023-08-10T09:48:12Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | IEEE Journal of Emerging and Selected Topics in Industrial Electronics. 2023, 4 (4), 1124-1137. | en_US |
dc.identifier.issn | 2687-9735 | |
dc.identifier.uri | https://hdl.handle.net/11250/3115425 | |
dc.description.abstract | This paper presents a frequency-adaptive energy control strategy for a Modular Multilevel Converter (MMC) which is suitable for grid-forming operation under unbalanced conditions. The average components of the energy sum and energy difference feedback signals for each phase are extracted by frequency-adaptive notch filters based on Second Order Generalized Integrators (SOGIs). Frequency-adaptivity is provided by utilizing the internal frequency defined by the power-balance-based synchronization mechanism of the grid-forming control. This approach prevents the filtering performance from degrading under islanded operation and other weak grid conditions where large frequency variations can occur. A comparative analysis between the frequency-adaptive notch filtering (FA-NF) and an implementation based on conventional fixed-width moving average filters (MAF) is presented. In addition to the improved performance at off-nominal frequency, the SOGI-based FA-NF implementation reduces the delay in the energy feedback signals compared to the MAF-based reference case, resulting in improved stability margins and a more damped response. The performance of the proposed energy control strategy is comprehensively demonstrated by time-domain simulations of an HVDC terminal and by experimental testing on a 50 kVA MMC prototype. Both grid connected and islanded conditions are evaluated while considering 5 different strategies for controlling the negative sequence currents during unbalanced conditions. | en_US |
dc.description.abstract | Frequency-Adaptive Energy Control for Grid-Forming MMCs Under Unbalanced Conditions | en_US |
dc.language.iso | eng | en_US |
dc.publisher | IEEE | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Frequency-Adaptive Energy Control for Grid-Forming MMCs Under Unbalanced Conditions | en_US |
dc.title.alternative | Frequency-Adaptive Energy Control for Grid-Forming MMCs Under Unbalanced Conditions | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | acceptedVersion | en_US |
dc.rights.holder | The Authors hold the copyright to the Author Accepted Manuscript. Distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) | en_US |
dc.source.pagenumber | 1124-1137 | en_US |
dc.source.volume | 4 | en_US |
dc.source.journal | IEEE Journal of Emerging and Selected Topics in Industrial Electronics | en_US |
dc.source.issue | 4 | en_US |
dc.identifier.doi | 10.1109/JESTIE.2023.3302707 | |
dc.identifier.cristin | 2166048 | |
dc.relation.project | Norges forskningsråd: 328750 | en_US |
dc.relation.project | Norges forskningsråd: 268053 | en_US |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |