Hybrid converter topologies for dc transmission systems

Grain Philip Adam; Fahad Alsokhiry; Ibrahim Abdelsalam; John Fletcher; Lie Xu; Yusuf Al-Turki

doi:10.1049/iet-pel.2018.5100

Hybrid converter topologies for dc transmission systems

Grain Philip Adam, Fahad Alsokhiry, Ibrahim Abdelsalam, John Fletcher, Lie Xu, Yusuf Al-Turki

Electronic And Electrical Engineering

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

4 Citations (Scopus)

16 Downloads (Pure)

Abstract

This study presents types 1 and 2 hybrid converters with reduced power circuit complexity compared with the mixed cell modular multilevel converter (MC-MMC). The type 1 converter is formed by replacing the director switches of the alternate arm converter by high-voltage (HV) half-bridge (HB) cells rated for half of the dc-link voltage. Also, it resembles special case of MC-MMC, where the entire HB cells of each arm are lumped into a single HV HB cell, with both capacitors of the half- and fullbridge cells are exposed to fundamental current as in the conventional MMC. The upper and lower arms of the type 2 converter resemble a front-to-front connection of two three-phase hybrid cascaded two-level converters, where the cell capacitors of the three-phase two-level converters that act as director switches do not experience fundamental currents. Therefore, the type 2 converter offers compact design compared with type 1 converter and the MC-MMC. The technical viabilities of the proposed hybrid converters are assessed using simulations, with both converters modelled in MATLAB-Simulink using electromagnetic transient simulation approach, considering normal and transient conditions. Experimental results obtained from single-phase type 1 converter confirm the practical viability of the proposed converters.

Original language	English
Pages (from-to)	607-619
Number of pages	13
Journal	IET Power Electronics
Volume	12
Issue number	3
Early online date	29 Nov 2018
DOIs	https://doi.org/10.1049/iet-pel.2018.5100
Publication status	Published - 20 Mar 2019

Keywords

hybrid converters
mixed cell converter
MC-MMC

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10.1049/iet-pel.2018.5100

Adam-etal-PE2018-Hybrid-converter-topologies-for-dc-transmission-systemsAccepted author manuscript, 1.92 MB

Cite this

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title = "Hybrid converter topologies for dc transmission systems",

abstract = "This study presents types 1 and 2 hybrid converters with reduced power circuit complexity compared with the mixed cell modular multilevel converter (MC-MMC). The type 1 converter is formed by replacing the director switches of the alternate arm converter by high-voltage (HV) half-bridge (HB) cells rated for half of the dc-link voltage. Also, it resembles special case of MC-MMC, where the entire HB cells of each arm are lumped into a single HV HB cell, with both capacitors of the half- and fullbridge cells are exposed to fundamental current as in the conventional MMC. The upper and lower arms of the type 2 converter resemble a front-to-front connection of two three-phase hybrid cascaded two-level converters, where the cell capacitors of the three-phase two-level converters that act as director switches do not experience fundamental currents. Therefore, the type 2 converter offers compact design compared with type 1 converter and the MC-MMC. The technical viabilities of the proposed hybrid converters are assessed using simulations, with both converters modelled in MATLAB-Simulink using electromagnetic transient simulation approach, considering normal and transient conditions. Experimental results obtained from single-phase type 1 converter confirm the practical viability of the proposed converters.",

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author = "Adam, {Grain Philip} and Fahad Alsokhiry and Ibrahim Abdelsalam and John Fletcher and Lie Xu and Yusuf Al-Turki",

note = "This paper is a postprint of a paper submitted to and accepted for publication in IET Power Electronics and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.",

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AU - Adam, Grain Philip

AU - Alsokhiry, Fahad

AU - Abdelsalam, Ibrahim

AU - Fletcher, John

AU - Xu, Lie

AU - Al-Turki, Yusuf

N1 - This paper is a postprint of a paper submitted to and accepted for publication in IET Power Electronics and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.

PY - 2019/3/20

Y1 - 2019/3/20

N2 - This study presents types 1 and 2 hybrid converters with reduced power circuit complexity compared with the mixed cell modular multilevel converter (MC-MMC). The type 1 converter is formed by replacing the director switches of the alternate arm converter by high-voltage (HV) half-bridge (HB) cells rated for half of the dc-link voltage. Also, it resembles special case of MC-MMC, where the entire HB cells of each arm are lumped into a single HV HB cell, with both capacitors of the half- and fullbridge cells are exposed to fundamental current as in the conventional MMC. The upper and lower arms of the type 2 converter resemble a front-to-front connection of two three-phase hybrid cascaded two-level converters, where the cell capacitors of the three-phase two-level converters that act as director switches do not experience fundamental currents. Therefore, the type 2 converter offers compact design compared with type 1 converter and the MC-MMC. The technical viabilities of the proposed hybrid converters are assessed using simulations, with both converters modelled in MATLAB-Simulink using electromagnetic transient simulation approach, considering normal and transient conditions. Experimental results obtained from single-phase type 1 converter confirm the practical viability of the proposed converters.

AB - This study presents types 1 and 2 hybrid converters with reduced power circuit complexity compared with the mixed cell modular multilevel converter (MC-MMC). The type 1 converter is formed by replacing the director switches of the alternate arm converter by high-voltage (HV) half-bridge (HB) cells rated for half of the dc-link voltage. Also, it resembles special case of MC-MMC, where the entire HB cells of each arm are lumped into a single HV HB cell, with both capacitors of the half- and fullbridge cells are exposed to fundamental current as in the conventional MMC. The upper and lower arms of the type 2 converter resemble a front-to-front connection of two three-phase hybrid cascaded two-level converters, where the cell capacitors of the three-phase two-level converters that act as director switches do not experience fundamental currents. Therefore, the type 2 converter offers compact design compared with type 1 converter and the MC-MMC. The technical viabilities of the proposed hybrid converters are assessed using simulations, with both converters modelled in MATLAB-Simulink using electromagnetic transient simulation approach, considering normal and transient conditions. Experimental results obtained from single-phase type 1 converter confirm the practical viability of the proposed converters.

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KW - MC-MMC

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DO - 10.1049/iet-pel.2018.5100

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VL - 12

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JO - IET Power Electronics

JF - IET Power Electronics

IS - 3

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Hybrid converter topologies for dc transmission systems

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