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Investigation of LVRT Capability of a DFIG Based WECS Under Different Grid Codes

During voltage drops, wind turbines must remain connected to the grid and contribute to the voltage stability. This requires that all modern installations must be equipped with Low-Voltage Ride-Through (LVRT) capability based on grid codes. In this paper a comparative study of LVRT capacity of a Doubly Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS) for different countries grid codes and different wind speeds is presented. Modeling and control strategy of the WECS are described. To improve the LVRT capacity of the WECS, a simple approach, based mainly on keeping the stator current close to its rated value by decreasing the active power proportionally to the voltage dips, has been used. The simulation results show the wind speed range over which the LVRT of the WECS is ensured.