Control of a DFIG-based wind system in presence of large grid faults: analysis of voltage ride through capability

In this paper, the authors study a variable speed wind generation system based on doubly fed induction generator (DFIG) in case of large balanced voltage dip and analyzed a remedial solution that allows for the turbine to stay connected and helps grid recovery through reactive power injection, by supplying the grid with reactive power during faults. Simulation results show the effectiveness of the solution in different operating points of the four working regions of the power-speed turbine characteristic.