Enhanced AC voltage and frequency control of offshore MMC station for wind farm connection

Research output: Contribution to journalArticle

Abstract

Connecting large offshore wind farms using HVDC transmission systems based on modular multilevel converter (MMC), the offshore AC voltage and frequency are regulated by the offshore MMC station and are important for the stable wind power generation and transmission. This paper proposes an enhanced AC voltage and frequency control strategy of the offshore MMC for wind farm integration, where an additional frequency loop is used to improve its AC voltage and frequency controllability. A fault current injection control is also proposed, where the offshore MMC station actively provides fault currents during an offshore AC fault to enable overcurrent protection for the network. To ride-through onshore AC faults, a DC voltage dependent AC voltage controller is introduced to actively reduce the offshore AC voltage during an onshore AC fault to alleviate the DC overvoltage of the HVDC system. Simulation results in normal operation and during offshore and onshore faults confirm the feasibility of the proposed control scheme.
LanguageEnglish
JournalIET Renewable Power Generation
Publication statusAccepted/In press - 12 Jun 2018

Fingerprint

Electric potential
Electric fault currents
Overcurrent protection
Offshore wind farms
Controllability
Power transmission
Wind power
Power generation
Controllers

Keywords

  • HVDC power convertors
  • wind power
  • HVDC power transmission
  • wind farms
  • modular multilevel converter

Cite this

@article{7ac05cdb153a477b862ad69db7f17a21,
title = "Enhanced AC voltage and frequency control of offshore MMC station for wind farm connection",
abstract = "Connecting large offshore wind farms using HVDC transmission systems based on modular multilevel converter (MMC), the offshore AC voltage and frequency are regulated by the offshore MMC station and are important for the stable wind power generation and transmission. This paper proposes an enhanced AC voltage and frequency control strategy of the offshore MMC for wind farm integration, where an additional frequency loop is used to improve its AC voltage and frequency controllability. A fault current injection control is also proposed, where the offshore MMC station actively provides fault currents during an offshore AC fault to enable overcurrent protection for the network. To ride-through onshore AC faults, a DC voltage dependent AC voltage controller is introduced to actively reduce the offshore AC voltage during an onshore AC fault to alleviate the DC overvoltage of the HVDC system. Simulation results in normal operation and during offshore and onshore faults confirm the feasibility of the proposed control scheme.",
keywords = "HVDC power convertors, wind power, HVDC power transmission, wind farms, modular multilevel converter",
author = "Yiran Jing and Rui Li and Lie Xu and Yi Wang",
note = "This paper is a postprint of a paper submitted to and accepted for publication in IET Renewable Power Generation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.",
year = "2018",
month = "6",
day = "12",
language = "English",
journal = "IET Renewable Power Generation",
issn = "1752-1416",
publisher = "Institution of Engineering and Technology",

}

TY - JOUR

T1 - Enhanced AC voltage and frequency control of offshore MMC station for wind farm connection

AU - Jing, Yiran

AU - Li, Rui

AU - Xu, Lie

AU - Wang, Yi

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

PY - 2018/6/12

Y1 - 2018/6/12

N2 - Connecting large offshore wind farms using HVDC transmission systems based on modular multilevel converter (MMC), the offshore AC voltage and frequency are regulated by the offshore MMC station and are important for the stable wind power generation and transmission. This paper proposes an enhanced AC voltage and frequency control strategy of the offshore MMC for wind farm integration, where an additional frequency loop is used to improve its AC voltage and frequency controllability. A fault current injection control is also proposed, where the offshore MMC station actively provides fault currents during an offshore AC fault to enable overcurrent protection for the network. To ride-through onshore AC faults, a DC voltage dependent AC voltage controller is introduced to actively reduce the offshore AC voltage during an onshore AC fault to alleviate the DC overvoltage of the HVDC system. Simulation results in normal operation and during offshore and onshore faults confirm the feasibility of the proposed control scheme.

AB - Connecting large offshore wind farms using HVDC transmission systems based on modular multilevel converter (MMC), the offshore AC voltage and frequency are regulated by the offshore MMC station and are important for the stable wind power generation and transmission. This paper proposes an enhanced AC voltage and frequency control strategy of the offshore MMC for wind farm integration, where an additional frequency loop is used to improve its AC voltage and frequency controllability. A fault current injection control is also proposed, where the offshore MMC station actively provides fault currents during an offshore AC fault to enable overcurrent protection for the network. To ride-through onshore AC faults, a DC voltage dependent AC voltage controller is introduced to actively reduce the offshore AC voltage during an onshore AC fault to alleviate the DC overvoltage of the HVDC system. Simulation results in normal operation and during offshore and onshore faults confirm the feasibility of the proposed control scheme.

KW - HVDC power convertors

KW - wind power

KW - HVDC power transmission

KW - wind farms

KW - modular multilevel converter

UR - http://digital-library.theiet.org/content/journals/iet-rpg

M3 - Article

JO - IET Renewable Power Generation

T2 - IET Renewable Power Generation

JF - IET Renewable Power Generation

SN - 1752-1416

ER -