Advantages and disadvantages of all kinds of LVRT topological structures and the control strategies applied in the current DFIG are discussed, and the new LVRT scheme different from the Crowbar technology is presented. On the basis of analyzing the new LVRT topological structures of DFIG with DBR circuit topology as well as the effect of the DBR circuit during grid voltage dip, the mathematical models of the equivalent circuit of DFIG power system during normal voltage and grid voltage dip are established. Through analyzing the mathematical models, the control mode of LVRT is presented. At last, the experimental waveforms are analyzed at the WEC rate power output while under 20% balanced and unbalanced voltage dip respectively on the new LVRT topology, and it is fully verified that the DBR strategy is feasible.