New monolithic modular DC-DC converter for constant current offshore interconnection with VSC HVdc network

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Mansour, Mohamed and Abdel-Moneim, Mohamed G. and Abdel-Khalik, Ayman S. and Ahmed, Shehab and Ahmed, Khaled H. (2025) New monolithic modular DC-DC converter for constant current offshore interconnection with VSC HVdc network. IEEE Access, 13. pp. 71806-71821. ISSN 2169-3536 (https://doi.org/10.1109/access.2025.3562802)

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Abstract

The rapid growth in HVDC (High Voltage Direct Current) grids has shown the falls of point-to-point connections. Several challenges such as the requirement of DC (Direct Current) fault blocking capability, interfacing of different grounding schemes, offering multi-vendor interoperability, and difficult to achieve high DC voltage stepping, represent serious issues to deployment of HVDC grids. DC-DC converters are considered the optimum candidate to overcome these challenges in HVDC grids interconnection. In this paper, a novel isolated hybrid monolithic modular DC-DC converter is proposed that interconnects LCC/VSC (Line Commutated Converter/Voltage Source Converter) based HVDC networks. It achieves smaller count of semiconductors, lower conduction losses and DC fault blocking. Detailed mathematical analysis, design, and control of the proposed DC-DC converter are illustrated. Also, both simulation model and experimental test rig are built to validate the proposed DC-DC converter under different normal operational and fault scenarios.

ORCID iDs

Mansour, Mohamed, Abdel-Moneim, Mohamed G., Abdel-Khalik, Ayman S., Ahmed, Shehab and Ahmed, Khaled H. ORCID logoORCID: https://orcid.org/0000-0002-7912-8140;
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