Hybrid converter topologies for dc transmission systems

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

Research output: Contribution to journalArticle

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.

LanguageEnglish
Pages607-619
Number of pages13
JournalIET Power Electronics
Volume12
Issue number3
Early online date29 Nov 2018
DOIs
Publication statusPublished - 20 Mar 2019

Fingerprint

Topology
Electric potential
Capacitors
Switches
MATLAB
Networks (circuits)

Keywords

  • hybrid converters
  • mixed cell converter
  • MC-MMC

Cite this

Adam, Grain Philip ; Alsokhiry, Fahad ; Abdelsalam, Ibrahim ; Fletcher, John ; Xu, Lie ; Al-Turki, Yusuf. / Hybrid converter topologies for dc transmission systems. In: IET Power Electronics. 2019 ; Vol. 12, No. 3. pp. 607-619.
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Adam, GP, Alsokhiry, F, Abdelsalam, I, Fletcher, J, Xu, L & Al-Turki, Y 2019, 'Hybrid converter topologies for dc transmission systems' IET Power Electronics, vol. 12, no. 3, pp. 607-619. https://doi.org/10.1049/iet-pel.2018.5100

Hybrid converter topologies for dc transmission systems. / Adam, Grain Philip; Alsokhiry, Fahad; Abdelsalam, Ibrahim; Fletcher, John; Xu, Lie; Al-Turki, Yusuf.

In: IET Power Electronics, Vol. 12, No. 3, 20.03.2019, p. 607-619.

Research output: Contribution to journalArticle

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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.

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