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Improvement of voltage quality in connection of wind farms to transmission network using VSC-HVDC

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4 Author(s)
Livani, H. ; Dept. of Electr. & Comput. Eng., Babol Univ. of Technol., Babol ; Rouhi, J. ; Lesan, S. ; Karimi-Davijani, H.

This paper studies possible improvements of voltage quality in connection of 40 MW wind farm to transmission network using VSC-HVDC link. The 40 MW wind farm includes 20 individual 2 MW permanent magnet synchronous generators. The voltage at the transmission network terminal should be re-established with minimized power losses during wind speed fluctuations and after the clearance of grid side faults. This paper emphasizes on a modified decoupling control strategy which is implemented in VSC-HVDC converters to obtain variable speed operation and voltage stabilization in wind farm network and transmission network respectively. Simulations using PSCAD/EMTDC are performed to study behavior of wind farm, transmission voltage and dc voltage for different changes in wind speed and three-phase fault and a 20% voltage sag on transmission network. The simulation results confirm the connection method and the modified decoupling control strategy.

Published in:

Power Quality and Supply Reliability Conference, 2008. PQ 2008

Date of Conference:

27-29 Aug. 2008