Doubly-fed induction generator（DFIG） is sensitive to the grid faults， and its low voltage ride-through（LVRT） operation and control technology attracts more and more research interests. The LVRT operation characteristics of doubly-fed induction generator wind turbines with a series grid-side converter in the stator are investigated， and an operational control strategy is proposed. To restrain the stator and rotor currents during the grid fault， the series grid-side converter is controlled to suppress the transient DC flux component in the stator flux and the negative component in the grid voltage. In the mean time， a successful LVRT under the grid fault is realized by also controlling the rotor-side converter. Simulation results show that the proposed control strategy can make the DFIG system achieve zero voltage ride-through， and the generation system with the new topology has the excellent fault ride-through capability under symmetrical and unsymmetrical faults.