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

Research output: Contribution to conferencePaper

Abstract

For HVDC transmission systems based on modular multilevel converter (MMC) for connecting large offshore wind farms, the offshore AC voltage is regulated by the offshore MMC station and stable offshore AC voltage and frequency 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. The proposed scheme considers the working principle of the phase locked loop (PLL) where the measured q-axis voltage drives the frequency output for the generated AC voltage. Thus, the output of the proposed frequency loop sets the q-axis voltage reference and feeds to the AC voltage loop to regulate the offshore AC frequency. Compared to conventional approach where no frequency loop is used and the converter simply produces the output as per the offline phase information, the proposed strategy can tightly control the AC voltage of the offshore network, which contributes to a stable transmission of the offshore wind energy. Simulation results in normal operation and during symmetrical fault confirm the feasibility of the proposed control scheme.
LanguageEnglish
Number of pages6
Publication statusPublished - 19 Oct 2017
EventThe 6th Renewable Power Generation Conference (RPG 2017) - Wuhan, China
Duration: 19 Oct 201720 Nov 2017

Conference

ConferenceThe 6th Renewable Power Generation Conference (RPG 2017)
CountryChina
CityWuhan
Period19/10/1720/11/17

Fingerprint

Electric potential
Wind power
Offshore wind farms
Phase locked loops
Controllability
Power transmission
Power generation

Keywords

  • high voltage direct current (HVDC) transmission system
  • modular multilevel converter (MMC)
  • offshore wind power
  • voltage and frequency control

Cite this

Jing, Y., Li, R., Xu, L., & Wang, Y. (2017). Enhanced AC voltage and frequency control on offshore MMC station for wind farm. Paper presented at The 6th Renewable Power Generation Conference (RPG 2017), Wuhan, China.
Jing, Yiran ; Li, Rui ; Xu, Lie ; Wang, Yi. / Enhanced AC voltage and frequency control on offshore MMC station for wind farm. Paper presented at The 6th Renewable Power Generation Conference (RPG 2017), Wuhan, China.6 p.
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title = "Enhanced AC voltage and frequency control on offshore MMC station for wind farm",
abstract = "For HVDC transmission systems based on modular multilevel converter (MMC) for connecting large offshore wind farms, the offshore AC voltage is regulated by the offshore MMC station and stable offshore AC voltage and frequency 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. The proposed scheme considers the working principle of the phase locked loop (PLL) where the measured q-axis voltage drives the frequency output for the generated AC voltage. Thus, the output of the proposed frequency loop sets the q-axis voltage reference and feeds to the AC voltage loop to regulate the offshore AC frequency. Compared to conventional approach where no frequency loop is used and the converter simply produces the output as per the offline phase information, the proposed strategy can tightly control the AC voltage of the offshore network, which contributes to a stable transmission of the offshore wind energy. Simulation results in normal operation and during symmetrical fault confirm the feasibility of the proposed control scheme.",
keywords = "high voltage direct current (HVDC) transmission system, modular multilevel converter (MMC), offshore wind power, voltage and frequency control",
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language = "English",
note = "The 6th Renewable Power Generation Conference (RPG 2017) ; Conference date: 19-10-2017 Through 20-11-2017",

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Jing, Y, Li, R, Xu, L & Wang, Y 2017, 'Enhanced AC voltage and frequency control on offshore MMC station for wind farm' Paper presented at The 6th Renewable Power Generation Conference (RPG 2017), Wuhan, China, 19/10/17 - 20/11/17, .

Enhanced AC voltage and frequency control on offshore MMC station for wind farm. / Jing, Yiran; Li, Rui; Xu, Lie; Wang, Yi.

2017. Paper presented at The 6th Renewable Power Generation Conference (RPG 2017), Wuhan, China.

Research output: Contribution to conferencePaper

TY - CONF

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

AU - Jing, Yiran

AU - Li, Rui

AU - Xu, Lie

AU - Wang, Yi

PY - 2017/10/19

Y1 - 2017/10/19

N2 - For HVDC transmission systems based on modular multilevel converter (MMC) for connecting large offshore wind farms, the offshore AC voltage is regulated by the offshore MMC station and stable offshore AC voltage and frequency 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. The proposed scheme considers the working principle of the phase locked loop (PLL) where the measured q-axis voltage drives the frequency output for the generated AC voltage. Thus, the output of the proposed frequency loop sets the q-axis voltage reference and feeds to the AC voltage loop to regulate the offshore AC frequency. Compared to conventional approach where no frequency loop is used and the converter simply produces the output as per the offline phase information, the proposed strategy can tightly control the AC voltage of the offshore network, which contributes to a stable transmission of the offshore wind energy. Simulation results in normal operation and during symmetrical fault confirm the feasibility of the proposed control scheme.

AB - For HVDC transmission systems based on modular multilevel converter (MMC) for connecting large offshore wind farms, the offshore AC voltage is regulated by the offshore MMC station and stable offshore AC voltage and frequency 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. The proposed scheme considers the working principle of the phase locked loop (PLL) where the measured q-axis voltage drives the frequency output for the generated AC voltage. Thus, the output of the proposed frequency loop sets the q-axis voltage reference and feeds to the AC voltage loop to regulate the offshore AC frequency. Compared to conventional approach where no frequency loop is used and the converter simply produces the output as per the offline phase information, the proposed strategy can tightly control the AC voltage of the offshore network, which contributes to a stable transmission of the offshore wind energy. Simulation results in normal operation and during symmetrical fault confirm the feasibility of the proposed control scheme.

KW - high voltage direct current (HVDC) transmission system

KW - modular multilevel converter (MMC)

KW - offshore wind power

KW - voltage and frequency control

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M3 - Paper

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Jing Y, Li R, Xu L, Wang Y. Enhanced AC voltage and frequency control on offshore MMC station for wind farm. 2017. Paper presented at The 6th Renewable Power Generation Conference (RPG 2017), Wuhan, China.