An improved control strategy of DFIG systems

May 14th, 2015
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Abstract : With the increasing percentage of wind power in the utility grid, grid codes require that wind turbines must have low voltage ride through (LVRT) capability. Considering that doubly fed induction generation (DFIG) systems have the tolerance capability , to overcome the drawback of LVRT operation of DFIG system using crowbar, a dynamic voltage

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An improved control strategy of DFIG systemsAn Improved Control Strategy for DFIG System andDynamic Voltage Restorer under Grid Voltage DipPeng Cheng, Heng Nian, Member, IEEECollege of Electrical Engineering, Zhejiang University, Hangzhou, China cheng_peng@zju.edu.cnAbstractWith the increasing percentage of wind power inthe utility grid, grid codes require that wind turbines must have low voltage ride through (LVRT) capability. Considering that doubly fed induction generation (DFIG) systems have thetolerance capability , to overcome the drawback of LVRToperation of DFIG system using crowbar, a dynamic voltagerestorer (DVR) is connected to the stator side to prevent the stator voltage fast changing, and then the rotor side converter (RSC) can be in normal operation. A mathematical model of the rotor voltage of DFIG during a symmetrical voltage dip ispresented to describe the allowable changing rate of the stator voltage. A new connection structure of DVR is proposed where DVR and GSC share a DC capacitor. Based on the coordinatedcontrol of the DFIG system and DVR, the active powerregulation and reactive power compensation can be implemented under the grid fault. The simulation results for a 1.5MW DFIG system is given to show the effectiveness of the proposedprotection compared to the rotor crowbar during grid fault.fault, the RSC can be disconnected from the rotor windingand the crowbar is connected to the rotor winding, in whichoperation the DFIG b

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