Development of LVRT and HVRT control strategy for DFIG based wind turbine system

Abstract

With a rapid increase of large wind farms across the globe, a problem associated with the wind turbine is voltage fluctuation of the grid during power generation. Voltage fluctuation could be over voltage or voltage dips and under those conditions the performance of the wind turbines is normally deteriorated. Over voltage withstanding capability of the wind turbine is normally known as High Voltage Ride Through (HVRT) and on the other hand capability of wind turbines during voltage dips is known as Low Voltage Ride Through (LVRT). The problems due to sudden over voltage and voltage dips are normally associated with the power electronic converters fed wind turbines and are being affected by the poor grid conditions. In this paper, an algorithm has been formulated to handle such situations in order to overcome the effects of over voltage and low voltage grid conditions and to save the doubly fed induction generator based wind turbines without affecting the performance. System modeling and simulation results presented in this paper prove the effectiveness of the proposed strategy.