Modular multilevel converter with full-bridge submodules for flexible medium voltage DC electric railway systems

Sharifi, Sina ORCID: 0000-0002-9947-9116 (2023). Modular multilevel converter with full-bridge submodules for flexible medium voltage DC electric railway systems. University of Birmingham. Ph.D.

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The idea of using DC railway electrification systems operating at medium voltage levels has been proposed in the literature. The Medium-voltage DC (MVDC) railway electrification systems are suitable options for the mainline and high-speed electric railways and have a wide range of advantages over the traditional AC and DC electrification systems. The benefits include but are not limited to less voltage drop, less impact on the public AC networks and possibility of connection to the low-voltage AC distribution networks, simple power supply diagram, and possibility of forming DC microgrids with the MVDC railway feeder as the main part.

Despite the advantages and due to practical challenges, MVDC railways have not been implemented in the railway industry. In particular, designing AC-DC power converters for the MVDC TPSs is one of the challenges towards developing the MVDC railways.

In this research, a 25 kV DC railway electrification system for the high-speed lines has been proposed. For the MVDC TPSs, a modular multilevel converter with full bridge submodules (MMC-FB) has been designed and a suitable control and modulation scheme for the MMC-FB has been developed. In the next step, the performance of the proposed MMC-FB and its controller has been evaluated by the MVDC railway simulation models in various operating scenarios.

Finally, the technical feasibility of the proposed control and modulation scheme has been investigated using a small-scale lab demonstrator of an MVDC TPS. Similar to the simulation results, the experimental results show the appropriateness of the MMC-FBs for the MVDC TPSs.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Licence: All rights reserved
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Engineering, Department of Electronic, Electrical and Systems Engineering
Funders: European Commission
Subjects: Q Science > Q Science (General)
T Technology > TF Railroad engineering and operation


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