Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances

Jinke Li; Georgios Konstantinou; Harith R. Wickramasinghe; Josep Pou; Xinmin Jin

doi:10.1109/IECON.2017.8216781

Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances

Jinke Li, Georgios Konstantinou, Harith R. Wickramasinghe, Josep Pou, Xinmin Jin

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

The negative- and zero-sequence currents of a modular multilevel converter (MMC) under imbalanced ac-grid conditions increase the maximum voltage of the submodule (SM) capacitors, which should be kept below a maximum voltage limit. This paper investigates the impact of offset pulse-width modulation (OPWM) on the capacitor voltage of the MMC under imbalanced ac-grid conditions. It is demonstrated that OPWM increases the maximum operating range of the MMC for a given set of restrictions, as it leads to a reduction of capacitor voltage by utilizing the total number of the SMs in the arms. Simulation results from an 800-MVA MMC-based HVDC transmission system demonstrate the effect of OPWM in the operation of the converters and the efficacy of the method compared to standard modulation methods.

Original language	English
Title of host publication	Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	4538-4543
Number of pages	6
ISBN (Electronic)	9781538611272
DOIs	https://doi.org/10.1109/IECON.2017.8216781
Publication status	Published - Dec 15 2017
Externally published	Yes
Event	43rd Annual Conference of the IEEE Industrial Electronics Society, IECON 2017 - Beijing, China Duration: Oct 29 2017 → Nov 1 2017

Publication series

Name	Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society
Volume	2017-January

Conference

Conference	43rd Annual Conference of the IEEE Industrial Electronics Society, IECON 2017
Country/Territory	China
City	Beijing
Period	10/29/17 → 11/1/17

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

ASJC Scopus Subject Areas

Industrial and Manufacturing Engineering
Control and Optimization
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Keywords

capacitor voltage
imbalanced ac-grid conditions
Modular multilevel converter
pulse width modulation

Access to Document

10.1109/IECON.2017.8216781

Cite this

Li, J., Konstantinou, G., Wickramasinghe, H. R., Pou, J., & Jin, X. (2017). Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances. In Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society (pp. 4538-4543). (Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society; Vol. 2017-January). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IECON.2017.8216781

Li, Jinke ; Konstantinou, Georgios ; Wickramasinghe, Harith R. et al. / Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances. Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., 2017. pp. 4538-4543 (Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society).

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title = "Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances",

abstract = "The negative- and zero-sequence currents of a modular multilevel converter (MMC) under imbalanced ac-grid conditions increase the maximum voltage of the submodule (SM) capacitors, which should be kept below a maximum voltage limit. This paper investigates the impact of offset pulse-width modulation (OPWM) on the capacitor voltage of the MMC under imbalanced ac-grid conditions. It is demonstrated that OPWM increases the maximum operating range of the MMC for a given set of restrictions, as it leads to a reduction of capacitor voltage by utilizing the total number of the SMs in the arms. Simulation results from an 800-MVA MMC-based HVDC transmission system demonstrate the effect of OPWM in the operation of the converters and the efficacy of the method compared to standard modulation methods.",

keywords = "capacitor voltage, imbalanced ac-grid conditions, Modular multilevel converter, pulse width modulation",

author = "Jinke Li and Georgios Konstantinou and Wickramasinghe, {Harith R.} and Josep Pou and Xinmin Jin",

note = "Publisher Copyright: {\textcopyright} 2017 IEEE.; 43rd Annual Conference of the IEEE Industrial Electronics Society, IECON 2017 ; Conference date: 29-10-2017 Through 01-11-2017",

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doi = "10.1109/IECON.2017.8216781",

language = "English",

series = "Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society",

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Li, J, Konstantinou, G, Wickramasinghe, HR, Pou, J & Jin, X 2017, Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances. in Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, vol. 2017-January, Institute of Electrical and Electronics Engineers Inc., pp. 4538-4543, 43rd Annual Conference of the IEEE Industrial Electronics Society, IECON 2017, Beijing, China, 10/29/17. https://doi.org/10.1109/IECON.2017.8216781

Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances. / Li, Jinke; Konstantinou, Georgios; Wickramasinghe, Harith R. et al.
Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., 2017. p. 4538-4543 (Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society; Vol. 2017-January).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances

AU - Li, Jinke

AU - Konstantinou, Georgios

AU - Wickramasinghe, Harith R.

AU - Pou, Josep

AU - Jin, Xinmin

PY - 2017/12/15

Y1 - 2017/12/15

N2 - The negative- and zero-sequence currents of a modular multilevel converter (MMC) under imbalanced ac-grid conditions increase the maximum voltage of the submodule (SM) capacitors, which should be kept below a maximum voltage limit. This paper investigates the impact of offset pulse-width modulation (OPWM) on the capacitor voltage of the MMC under imbalanced ac-grid conditions. It is demonstrated that OPWM increases the maximum operating range of the MMC for a given set of restrictions, as it leads to a reduction of capacitor voltage by utilizing the total number of the SMs in the arms. Simulation results from an 800-MVA MMC-based HVDC transmission system demonstrate the effect of OPWM in the operation of the converters and the efficacy of the method compared to standard modulation methods.

AB - The negative- and zero-sequence currents of a modular multilevel converter (MMC) under imbalanced ac-grid conditions increase the maximum voltage of the submodule (SM) capacitors, which should be kept below a maximum voltage limit. This paper investigates the impact of offset pulse-width modulation (OPWM) on the capacitor voltage of the MMC under imbalanced ac-grid conditions. It is demonstrated that OPWM increases the maximum operating range of the MMC for a given set of restrictions, as it leads to a reduction of capacitor voltage by utilizing the total number of the SMs in the arms. Simulation results from an 800-MVA MMC-based HVDC transmission system demonstrate the effect of OPWM in the operation of the converters and the efficacy of the method compared to standard modulation methods.

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Li J, Konstantinou G, Wickramasinghe HR, Pou J, Jin X. Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances. In Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc. 2017. p. 4538-4543. (Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society). doi: 10.1109/IECON.2017.8216781

Offset PWM in modular multilevel converters for capacitor voltage reduction under grid imbalances

Abstract

Publication series

Conference

Bibliographical note

ASJC Scopus Subject Areas

Keywords

Access to Document

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