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Flicker study on variable speed wind turbines with doubly fed induction generators

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3 Author(s)
Tao Sun ; Inst. of Energy Technol., Aalborg Univ., China ; Zhe Chen ; Blaabjerg, F.

Grid connected wind turbines may produce flicker during continuous operation. This paper presents a simulation model of a MW-level variable speed wind turbine with a doubly fed induction generator developed in the simulation tool of PSCAD/EMTDC. Flicker emission of variable speed wind turbines with doubly fed induction generators is investigated during continuous operation, and the dependence of flicker emission on mean wind speed, wind turbulence intensity, short circuit capacity of grid and grid impedance angle are analyzed. A comparison is done with the fixed speed wind turbine, which leads to a conclusion that the factors mentioned above have different influences on flicker emission compared with that in the case of the fixed speed wind turbine. Flicker mitigation is realized by output reactive power control of the variable speed wind turbine with doubly fed induction generator. Simulation results show the wind turbine output reactive power control provides an effective means for flicker mitigation regardless of mean wind speed, turbulence intensity and short circuit capacity ratio.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:20 ,  Issue: 4 )

Date of Publication:

Dec. 2005

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