Coordinated Control Strategies for Offshore Wind Farm Integration via VSC-HVDC for System Frequency Support

Coordinated control strategies to provide system inertia support for main grid from offshore wind farm that is integrated through HVdc transmission is the subject matter of this paper. The strategy that seeks to provide inertia support to the main grid through simultaneous utilization of HVdc capaci...

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Bibliographic Details
Published inIEEE transactions on energy conversion Vol. 32; no. 3; pp. 843 - 856
Main Authors Yujun Li, Zhao Xu, Ostergaard, Jacob, Hill, David J.
Format Journal Article
LanguageEnglish
Published IEEE 01.09.2017
Subjects
Capacitors
Cascading control
Frequency control
frequency regulation
HVDC transmission
inertia support
offshore wind farm
Power conversion
Voltage control
VSC-HVDC
Wind farms
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Summary:Coordinated control strategies to provide system inertia support for main grid from offshore wind farm that is integrated through HVdc transmission is the subject matter of this paper. The strategy that seeks to provide inertia support to the main grid through simultaneous utilization of HVdc capacitors energy, and wind turbines (WTs) inertia without installing the remote communication of two HVdc terminals is introduced in details. Consequently, a novel strategy is proposed to improve system inertia through sequentially exerting dc capacitors energy and then WTs inertia via a cascading control scheme. Both strategies can effectively provide inertia support while the second one minimizes the control impacts on harvesting wind energy with the aid of communication between onshore and offshore ac grids. Case studies of a wind farm connecting with a HVdc system considering sudden load variations have been successfully conducted to compare and demonstrate the effectiveness of the control strategies in DIgSILENT/PowerFactory.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2017.2663664