Symmetrical low-voltage ride-through of a 250-kW brushless DFIG

The brushless doubly-fed induction generator (DFIG) shows commercial promise for wind power generation due to its lower cost and higher reliability when compared with the conventional DFIG. In the most recent grid codes, wind generators are required to be able to ride through a low voltage fault and meet the reactive current demand from the grid. Hence, a low-voltage ride-through (LVRT) capability is important for wind generators which are integrated into the grid. In this presentation, the speaker proposes a control strategy enabling the brushless DFIG to successfully ride through a symmetrical voltage dip. The control strategy has been implemented on a 250-kW brushless DFIG and the experimental results indicate that LVRT is possible without a crowbar.