Circulating current control scheme of modular multilevel converters supplying passive networks under unbalanced load conditions

Huaitian Zhang; Harith R. Wickramasinghe; Long Jing; Jinke Li; Josep Pou; Georgios Konstantinou

doi:10.1016/j.epsr.2019.01.041

Circulating current control scheme of modular multilevel converters supplying passive networks under unbalanced load conditions

Huaitian Zhang, Harith R. Wickramasinghe, Long Jing^*, Jinke Li, Josep Pou, Georgios Konstantinou

^*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

Load imbalances in the supply of passive loads with modular multilevel converter (MMC)-based medium (MVDC) and high voltage (HVDC) dc-links are inevitable. In such applications, the maximum-allowable voltage ripples and peak arm currents define the operating limits of the MMCs. This paper demonstrates the impact of circulating current control in capacitor voltage ripples of sub-modules and peak arm currents under unbalanced load conditions when supplying passive networks, comparing the effects of three circulating current control methods on internal variables of the MMCs. The efficacy of the circulating current control is validated through real-time digital simulations of an 800 MVA benchmark MMC-based HVDC transmission system.

Original language	English
Pages (from-to)	36-46
Number of pages	11
Journal	Electric Power Systems Research
Volume	171
DOIs	https://doi.org/10.1016/j.epsr.2019.01.041
Publication status	Published - Jun 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

ASJC Scopus Subject Areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

Keywords

Capacitor voltage ripple
Circulating current
HVDC
Load imbalance
Modular multilevel converter
MVDC
Passive network

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10.1016/j.epsr.2019.01.041

Cite this

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title = "Circulating current control scheme of modular multilevel converters supplying passive networks under unbalanced load conditions",

abstract = "Load imbalances in the supply of passive loads with modular multilevel converter (MMC)-based medium (MVDC) and high voltage (HVDC) dc-links are inevitable. In such applications, the maximum-allowable voltage ripples and peak arm currents define the operating limits of the MMCs. This paper demonstrates the impact of circulating current control in capacitor voltage ripples of sub-modules and peak arm currents under unbalanced load conditions when supplying passive networks, comparing the effects of three circulating current control methods on internal variables of the MMCs. The efficacy of the circulating current control is validated through real-time digital simulations of an 800 MVA benchmark MMC-based HVDC transmission system.",

keywords = "Capacitor voltage ripple, Circulating current, HVDC, Load imbalance, Modular multilevel converter, MVDC, Passive network",

author = "Huaitian Zhang and Wickramasinghe, {Harith R.} and Long Jing and Jinke Li and Josep Pou and Georgios Konstantinou",

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doi = "10.1016/j.epsr.2019.01.041",

language = "English",

volume = "171",

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T1 - Circulating current control scheme of modular multilevel converters supplying passive networks under unbalanced load conditions

AU - Zhang, Huaitian

AU - Wickramasinghe, Harith R.

AU - Jing, Long

AU - Li, Jinke

AU - Pou, Josep

AU - Konstantinou, Georgios

PY - 2019/6

Y1 - 2019/6

N2 - Load imbalances in the supply of passive loads with modular multilevel converter (MMC)-based medium (MVDC) and high voltage (HVDC) dc-links are inevitable. In such applications, the maximum-allowable voltage ripples and peak arm currents define the operating limits of the MMCs. This paper demonstrates the impact of circulating current control in capacitor voltage ripples of sub-modules and peak arm currents under unbalanced load conditions when supplying passive networks, comparing the effects of three circulating current control methods on internal variables of the MMCs. The efficacy of the circulating current control is validated through real-time digital simulations of an 800 MVA benchmark MMC-based HVDC transmission system.

AB - Load imbalances in the supply of passive loads with modular multilevel converter (MMC)-based medium (MVDC) and high voltage (HVDC) dc-links are inevitable. In such applications, the maximum-allowable voltage ripples and peak arm currents define the operating limits of the MMCs. This paper demonstrates the impact of circulating current control in capacitor voltage ripples of sub-modules and peak arm currents under unbalanced load conditions when supplying passive networks, comparing the effects of three circulating current control methods on internal variables of the MMCs. The efficacy of the circulating current control is validated through real-time digital simulations of an 800 MVA benchmark MMC-based HVDC transmission system.

KW - Capacitor voltage ripple

KW - Circulating current

KW - HVDC

KW - Load imbalance

KW - Modular multilevel converter

KW - MVDC

KW - Passive network

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JO - Electric Power Systems Research

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Circulating current control scheme of modular multilevel converters supplying passive networks under unbalanced load conditions

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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