A novel method to determine droop coefficients of DC voltage control for VSC-MTDC system

Bin Li, Qingquan Li, Yizhen Wang, Weijie Wen, Botong Li, Lie Xu

Research output: Contribution to journalArticle

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Abstract

For droop control in voltage source converter based multi-terminal HVDC systems, the determination of droop coefficients is a key issue, which directly affects both power distribution and DC control performances. This paper proposes a novel design of droop coefficients considering the requirements of power distribution, DC voltage control and system stability. Considering the power margins of different converters, the ratio relationship among droop coefficients is established. Converters with larger power margins take bigger portion of power mismatch to avoid overload problem. Furthermore, the integral square error of converters DC voltage is adopted as the DC voltage control performance index, and optimization of droop coefficients to achieve coordinated DC voltage control of steady-state deviation and transient variation, is derived. Finally, the constraint of droop coefficients is established to guarantee the DC system stability after power disturbance. Case studies are conducted on the Nordic 32 system with an embedded 4-terminal DC grid to demonstrate the feasibility and effectiveness of the proposed droop control scheme.
Original languageEnglish
JournalIEEE Transactions on Power Delivery
Publication statusAccepted/In press - 20 Dec 2019

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Voltage control
System stability
Electric potential

Keywords

  • droop coefficient
  • droop control
  • DC voltage control
  • VSC-MTDC system

Cite this

@article{348f9294c41044f4a37bf0af70b5618c,
title = "A novel method to determine droop coefficients of DC voltage control for VSC-MTDC system",
abstract = "For droop control in voltage source converter based multi-terminal HVDC systems, the determination of droop coefficients is a key issue, which directly affects both power distribution and DC control performances. This paper proposes a novel design of droop coefficients considering the requirements of power distribution, DC voltage control and system stability. Considering the power margins of different converters, the ratio relationship among droop coefficients is established. Converters with larger power margins take bigger portion of power mismatch to avoid overload problem. Furthermore, the integral square error of converters DC voltage is adopted as the DC voltage control performance index, and optimization of droop coefficients to achieve coordinated DC voltage control of steady-state deviation and transient variation, is derived. Finally, the constraint of droop coefficients is established to guarantee the DC system stability after power disturbance. Case studies are conducted on the Nordic 32 system with an embedded 4-terminal DC grid to demonstrate the feasibility and effectiveness of the proposed droop control scheme.",
keywords = "droop coefficient, droop control, DC voltage control, VSC-MTDC system",
author = "Bin Li and Qingquan Li and Yizhen Wang and Weijie Wen and Botong Li and Lie Xu",
note = "{\circledC} 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.",
year = "2019",
month = "12",
day = "20",
language = "English",
journal = "IEEE Transactions on Power Delivery",
issn = "0885-8977",

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A novel method to determine droop coefficients of DC voltage control for VSC-MTDC system. / Li, Bin; Li, Qingquan; Wang, Yizhen; Wen, Weijie; Li, Botong; Xu, Lie.

In: IEEE Transactions on Power Delivery, 20.12.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A novel method to determine droop coefficients of DC voltage control for VSC-MTDC system

AU - Li, Bin

AU - Li, Qingquan

AU - Wang, Yizhen

AU - Wen, Weijie

AU - Li, Botong

AU - Xu, Lie

N1 - © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

PY - 2019/12/20

Y1 - 2019/12/20

N2 - For droop control in voltage source converter based multi-terminal HVDC systems, the determination of droop coefficients is a key issue, which directly affects both power distribution and DC control performances. This paper proposes a novel design of droop coefficients considering the requirements of power distribution, DC voltage control and system stability. Considering the power margins of different converters, the ratio relationship among droop coefficients is established. Converters with larger power margins take bigger portion of power mismatch to avoid overload problem. Furthermore, the integral square error of converters DC voltage is adopted as the DC voltage control performance index, and optimization of droop coefficients to achieve coordinated DC voltage control of steady-state deviation and transient variation, is derived. Finally, the constraint of droop coefficients is established to guarantee the DC system stability after power disturbance. Case studies are conducted on the Nordic 32 system with an embedded 4-terminal DC grid to demonstrate the feasibility and effectiveness of the proposed droop control scheme.

AB - For droop control in voltage source converter based multi-terminal HVDC systems, the determination of droop coefficients is a key issue, which directly affects both power distribution and DC control performances. This paper proposes a novel design of droop coefficients considering the requirements of power distribution, DC voltage control and system stability. Considering the power margins of different converters, the ratio relationship among droop coefficients is established. Converters with larger power margins take bigger portion of power mismatch to avoid overload problem. Furthermore, the integral square error of converters DC voltage is adopted as the DC voltage control performance index, and optimization of droop coefficients to achieve coordinated DC voltage control of steady-state deviation and transient variation, is derived. Finally, the constraint of droop coefficients is established to guarantee the DC system stability after power disturbance. Case studies are conducted on the Nordic 32 system with an embedded 4-terminal DC grid to demonstrate the feasibility and effectiveness of the proposed droop control scheme.

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