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

publication date

  • September 2018

start page

  • 1233

end page

  • 1241

issue

  • 3

volume

  • 33

International Standard Serial Number (ISSN)

  • 0885-8969

Electronic International Standard Serial Number (EISSN)

  • 1558-0059

abstract

  • 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.

keywords

  • diode rectifier; offshore wind farm (owf); frequency control; distributed control; high voltage dc (hvdc) transmission