Hybrid MMC based multi-terminal DC/DC converter with minimized FBSMs ratio considering DC fault isolation
Suo, Zhiwen and Li, Gengyin and Xu, Lie and Li, Rui and Wang, Weisheng and Chi, Yongning (2016) Hybrid MMC based multi-terminal DC/DC converter with minimized FBSMs ratio considering DC fault isolation. IET Renewable Power Generation. ISSN 1752-1416 (https://doi.org/10.1049/iet-rpg.2016.0281)
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Abstract
An isolated high-power multi-terminal DC/DC converter is studied in this paper, based on hybrid MMC configuration consisting of full-bridge submodules (FBSMs) and half-bridge submodules (HBSMs). To decrease the investment and power losses, a reduced arm FBSMs ratio (less than 0.5) scheme is adopted. A detailed analysis on the relationship of the DC/DC converter inner AC voltage and the arm FBSMs ratio under reduced DC voltage is presented. Based on this, a control strategy during DC fault is proposed which continues operating the converter connected to the faulty DC side with reactive current absorption. Under the same arm FBSMs ratio, compared to the conventional strategy of blocking the faulty side converter during a DC fault, the proposed unblocking method with reactive current injection can not only achieve greater DC fault current declining rate, but also ensure maximum power transfer between the interconnected healthy DC grids by maintaining a higher inner AC voltage in the DC/DC converter. The two strategies are compared and validated by simulations using PSCAD/EMTDC under different arm FBSMs ratio.
ORCID iDs
Suo, Zhiwen, Li, Gengyin, Xu, Lie ORCID: https://orcid.org/0000-0001-5633-7866, Li, Rui ORCID: https://orcid.org/0000-0001-8990-7546, Wang, Weisheng and Chi, Yongning;-
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Item type: Article ID code: 56766 Dates: DateEvent28 June 2016Published28 June 2016Published Online25 June 2016AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering Depositing user: Pure Administrator Date deposited: 28 Jun 2016 16:00 Last modified: 02 Sep 2024 00:47 URI: https://strathprints.strath.ac.uk/id/eprint/56766