Improvement of DFIG dynamic performance during intermittent fire-through fault

The number of wind turbines connected to power grids have significantly increased during the last decade. This is mainly due to the convincing revolution in power electronic technology and the growing concern about greenhouse effect that is intensified due to the burning of fossil fuels. Variable-speed wind energy conversion systems (WECSs) such as doubly fed induction generators (DFIGs) are dominating the wind energy market due to their superior advantages over fixed-speed-based WECS which include more captured energy, less mechanical stress, and acoustical noise. DFIG is interfaced to the ac network through the grid-side voltage source converter (GSC) and rotor-side RSC to enable the variable-speed operation of the wind turbine and to provide reactive power support to the ac grid during disturbance events. Converter switching malfunction such as fire-through may influence the power dispatch capability of the DFIG. In this paper, a coil is proposed to be integrated within the DFIG converters to improve dynamic performance of DFIG-based WECS during internal converter switching malfunctions such as fire-through fault. Simulation results without and with the coil connected to the system are presented.