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

Mohamed Mansour; Mohamed G. Abdel-Moneim; Ayman S. Abdel-Khalik; Shehab Ahmed; Khaled H. Ahmed

doi:10.1109/access.2025.3562802

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

Mohamed Mansour, Mohamed G. Abdel-Moneim, Ayman S. Abdel-Khalik, Shehab Ahmed, Khaled H. Ahmed

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	71806-71821
Number of pages	16
Journal	IEEE Access
Volume	13
Early online date	21 Apr 2025
DOIs	https://doi.org/10.1109/access.2025.3562802
Publication status	Published - 30 Apr 2025

Keywords

Modular multilevel converter (MMC)
monolithic
dc-dc converters
hybrid power electronic devices
IGCT
HVdc
power control
current source

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New_Monolithic_Modular_DC-DC_Converter_for_Constant_Current_Offshore_Interconnection_With_VSC_HVdc_NetworkFinal published version, 3.8 MBLicence: CC BY 4.0

Cite this

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title = "New monolithic modular DC-DC converter for constant current offshore interconnection with VSC HVdc network",

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.",

keywords = "Modular multilevel converter (MMC), monolithic, dc-dc converters, hybrid power electronic devices, IGCT, HVdc, power control, current source",

author = "Mohamed Mansour and Abdel-Moneim, {Mohamed G.} and Abdel-Khalik, {Ayman S.} and Shehab Ahmed and Ahmed, {Khaled H.}",

year = "2025",

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doi = "10.1109/access.2025.3562802",

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T1 - New monolithic modular DC-DC converter for constant current offshore interconnection with VSC HVdc network

AU - Mansour, Mohamed

AU - Abdel-Moneim, Mohamed G.

AU - Abdel-Khalik, Ayman S.

AU - Ahmed, Shehab

AU - Ahmed, Khaled H.

PY - 2025/4/30

Y1 - 2025/4/30

N2 - 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.

AB - 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.

KW - Modular multilevel converter (MMC)

KW - monolithic

KW - dc-dc converters

KW - hybrid power electronic devices

KW - IGCT

KW - HVdc

KW - power control

KW - current source

U2 - 10.1109/access.2025.3562802

DO - 10.1109/access.2025.3562802

M3 - Article

SN - 2169-3536

VL - 13

SP - 71806

EP - 71821

JO - IEEE Access

JF - IEEE Access

ER -

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

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Keywords

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