Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications

Aiming at the low-voltage DC distribution network system and combining the characteristics of F2F structure and ISOP-DAB structure DC transformer, this paper proposes a DC transformer structure based on modular multilevel converter (MMC) and cascaded H-bridge. First of all, this paper analyzes sever...

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Autores principales:	Guanglin Sha, Qing Duan, Wanxing Sheng, Chunyan Ma, Caihong Zhao, Yao Zhang, Jiachen Tian
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Cascaded H-bridge group voltage equalization algorithm modular multilevel converter Quasi-square wave modulation Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/6645cc263f1b4e338cc3aa8b2c7b569e
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spelling	oai:doaj.org-article:6645cc263f1b4e338cc3aa8b2c7b569e2021-11-19T00:06:51ZResearch on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications2169-353610.1109/ACCESS.2021.3072161https://doaj.org/article/6645cc263f1b4e338cc3aa8b2c7b569e2021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9399490/https://doaj.org/toc/2169-3536Aiming at the low-voltage DC distribution network system and combining the characteristics of F2F structure and ISOP-DAB structure DC transformer, this paper proposes a DC transformer structure based on modular multilevel converter (MMC) and cascaded H-bridge. First of all, this paper analyzes several different cases. <xref ref-type="other" rid="other1">Case 1</xref> proposes a type of equal carrier-phase-shift pulse-width modulation (CPS-PWM) of MMC, which can produce an equal five-level voltage waveform. In the meanwhile, another unequal CPS-PWM control is proposed to produce an unequal five-level voltage waveform. According to the descriptions of <xref ref-type="other" rid="other2">case 2</xref>, the quasi-square-wave-modulation method with a wide gain range can greatly reduce the insulation design difficulty of the intermediate AC side high-frequency transformer and the voltage stress on the AC side. <xref ref-type="other" rid="other3">Case 3</xref> demonstrates the extended-phase-shift (EPS) control of three-port DC-DC converter. Combining the voltage sorting algorithm of voltage sequencing and cyclic switching, a strategy of voltage equalization for grouped capacitors is proposed. Considering the various application scenarios of actual working conditions, the soft switching characteristics and multi-port power characteristics of the DC transformer are analyzed. In order to verify the feasibility of the DC transformer structure and its control strategy, a simulation model was built in Matlab/Simulink and the results were verified. The results are in accordance with the theoretical analysis.Guanglin ShaQing DuanWanxing ShengChunyan MaCaihong ZhaoYao ZhangJiachen TianIEEEarticleCascaded H-bridgegroup voltage equalization algorithmmodular multilevel converterQuasi-square wave modulationElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 95006-95022 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Cascaded H-bridge group voltage equalization algorithm modular multilevel converter Quasi-square wave modulation Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Cascaded H-bridge group voltage equalization algorithm modular multilevel converter Quasi-square wave modulation Electrical engineering. Electronics. Nuclear engineering TK1-9971 Guanglin Sha Qing Duan Wanxing Sheng Chunyan Ma Caihong Zhao Yao Zhang Jiachen Tian Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications
description	Aiming at the low-voltage DC distribution network system and combining the characteristics of F2F structure and ISOP-DAB structure DC transformer, this paper proposes a DC transformer structure based on modular multilevel converter (MMC) and cascaded H-bridge. First of all, this paper analyzes several different cases. <xref ref-type="other" rid="other1">Case 1</xref> proposes a type of equal carrier-phase-shift pulse-width modulation (CPS-PWM) of MMC, which can produce an equal five-level voltage waveform. In the meanwhile, another unequal CPS-PWM control is proposed to produce an unequal five-level voltage waveform. According to the descriptions of <xref ref-type="other" rid="other2">case 2</xref>, the quasi-square-wave-modulation method with a wide gain range can greatly reduce the insulation design difficulty of the intermediate AC side high-frequency transformer and the voltage stress on the AC side. <xref ref-type="other" rid="other3">Case 3</xref> demonstrates the extended-phase-shift (EPS) control of three-port DC-DC converter. Combining the voltage sorting algorithm of voltage sequencing and cyclic switching, a strategy of voltage equalization for grouped capacitors is proposed. Considering the various application scenarios of actual working conditions, the soft switching characteristics and multi-port power characteristics of the DC transformer are analyzed. In order to verify the feasibility of the DC transformer structure and its control strategy, a simulation model was built in Matlab/Simulink and the results were verified. The results are in accordance with the theoretical analysis.
format	article
author	Guanglin Sha Qing Duan Wanxing Sheng Chunyan Ma Caihong Zhao Yao Zhang Jiachen Tian
author_facet	Guanglin Sha Qing Duan Wanxing Sheng Chunyan Ma Caihong Zhao Yao Zhang Jiachen Tian
author_sort	Guanglin Sha
title	Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications
title_short	Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications
title_full	Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications
title_fullStr	Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications
title_full_unstemmed	Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications
title_sort	research on multi-port dc-dc converter based on modular multilevel converter and cascaded h bridges for mvdc applications
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/6645cc263f1b4e338cc3aa8b2c7b569e
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Research on Multi-Port DC-DC Converter Based on Modular Multilevel Converter and Cascaded H Bridges for MVDC Applications

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