Decentralized Control of Offshore Wind Farms Connected to Diode-Based HVdc Links

This paper presents a novel decentralized control for offshore wind farms connected to the onshore grid through a high-voltage dc link by means of a diode rectifier. The proposed control system is implemented in each wind turbine generator system (WTGS). The capacitor placed at the filter of the win...

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Bibliographic Details
Published inIEEE transactions on energy conversion Vol. 33; no. 3; pp. 1233 - 1241
Main Authors Cardiel-Alvarez, Miguel Angel, Arnaltes, Santiago, Rodriguez-Amenedo, Jose Luis, Nami, Ashkan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Capacitors
Control systems
Converters
Decentralized control
Diode rectifier
Diode rectifiers
distributed control
Electric potential
Frequency control
Frequency deviation
high voltage dc (HVdc) transmission
High voltages
HVDC transmission
Offshore
Offshore energy sources
offshore wind farm (OWF)
Proposals
Reactive power
Synchronism
Turbogenerators
Voltage control
Wind farms
Wind power
Wind power generation
Wind turbines
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Summary:This paper presents a novel decentralized control for offshore wind farms connected to the onshore grid through a high-voltage dc link by means of a diode rectifier. The proposed control system is implemented in each wind turbine generator system (WTGS). The capacitor placed at the filter of the wind turbine front-end converter is used for the proposed control implementation. Frequency control is achieved by aligning the capacitor voltage vector along a reference axis rotating at the reference frequency. Then, a frequency-reactive power droop control allows the synchronization of all the WTGSs. On the other hand, this droop strategy also leads to total reactive power sharing among WTGSs without relying on communications. An additional secondary frequency control is also implemented to compensate the frequency deviation caused by the droop control. The proposed control system has been validated by simulation and results demonstrate the appropriate performance even during start-up and faults.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2018.2804662