Picture of neon light reading 'Open'

Discover open research at Strathprints as part of International Open Access Week!

23-29 October 2017 is International Open Access Week. The Strathprints institutional repository is a digital archive of Open Access research outputs, all produced by University of Strathclyde researchers.

Explore recent world leading Open Access research content this Open Access Week from across Strathclyde's many research active faculties: Engineering, Science, Humanities, Arts & Social Sciences and Strathclyde Business School.

Explore all Strathclyde Open Access research outputs...

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

Text (Suo-etal-IETRPG2016-Hybrid-MMC-based-multi-terminal-DC-DC-converter)
Suo_etal_IETRPG2016_Hybrid_MMC_based_multi_terminal_DC_DC_converter.pdf - Accepted Author Manuscript

Download (666kB) | Preview


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.