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An Improved Control Method for a DFIG in a Wind Turbine under an Unbalanced Grid Voltage Condition

  • Lee, Sol-Bin (School of Electrical and Comp. Engineering, Ajou University) ;
  • Lee, Kyo-Beum (School of Electrical and Computer Engineering, Ajou University) ;
  • Lee, Dong-Choon (Department of Electrical Engineering, Yeungnam University) ;
  • Kim, Jang-Mok (Department of Electrical Engineering, Pusan National University)
  • Received : 2010.04.15
  • Accepted : 2010.09.01
  • Published : 2010.11.01

Abstract

This paper presents a control method, which reduces the pulsating torque and DC voltage problems of a doubly fed induction generator (DFIG)-based wind turbine system. To reduce the torque and power ripple, a current control scheme consisting of a proportional integral (PI) controller is presented in a positive synchronously rotating reference frame, which is capable of providing precise current control for a rotor-side converter with separated positive and negative components. The power theory can reduce the oscillation of the DC-link voltage in the grid-side converter. In this paper, the generator model is examined, and simulation results are obtained with a 3 kW DFIG-based wind turbine system to verify the proposed control strategy.

Keywords

References

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