Picture of person typing on laptop with programming code visible on the laptop screen

World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.


A hybrid modular multilevel converter with novel three-level cells for DC fault blocking capability

Li, Rui and Fletcher, John E. and Xu, Lie and Holliday, Derrick and Williams, Barry W. (2015) A hybrid modular multilevel converter with novel three-level cells for DC fault blocking capability. IEEE Transactions on Power Delivery, 30 (4). pp. 2017-2026. ISSN 0885-8977

Text (Li-etal-IEEE-TOPD-2015-A-hybrid-modular-multilevel-converter-with-novel-three-level-cells)
Li_etal_IEEE_TOPD_2015_A_hybrid_modular_multilevel_converter_with_novel_three_level_cells.pdf - Accepted Author Manuscript

Download (1MB) | Preview


A novel hybrid, modular multilevel converter is presented that utilizes a combination of half-bridge and novel three-level cells where the three-level cells utilize a clamp circuit which, under dc side faults, is capable of blocking fault current thereby avoiding overcurrents in the freewheel diodes. This dc fault blocking capability is demonstrated through simulation and is shown to be as good as the modular multilevel converter which utilizes full-bridge cells but with the added benefits of: lower conduction losses; fewer diode and semiconductor switching devices, and; fewer shoot-through modes. The semiconductor count and conduction loss of the proposed converter are reduced to around 66.5% and 72% of that of modular multilevel converter based on the full-bridge cells respectively, yielding lower semiconductor cost and improved efficiency. Dc fault ride-through operation is realized without exposing the semiconductors to significant fault currents and overvoltages due to the full dc fault blocking capability of the converter.