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An Improved Control Method for a DFIG in a Wind Turbine under an Unbalanced Grid Voltage Condition
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 Title & Authors
An Improved Control Method for a DFIG in a Wind Turbine under an Unbalanced Grid Voltage Condition
Lee, Sol-Bin; Lee, Kyo-Beum; Lee, Dong-Choon; Kim, Jang-Mok;
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 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
Doubly fed induction generator;Unbalanced disturbance;Torque oscillation;DC voltage ripple;Power generation control;Power theory;
 Language
English
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