The access of DFIG will affect the correct action of relay protection in the distribution network, and the influence of control strategy cannot be ignored. In this paper, based on the mathematical model of DFIG two-phase static coordinate system, the vector control model and the direct power control model of DFIG side converter are established respectively. Theoretical analysis shows that when a short-circuit fault occurs in the power grid, DFIG short-circuit characteristics under different control strategies have great differences, thus causing adverse effects on the relay protection. Simulation results show that the direct power control has fast response speed and large overshoot. The response speed of vector control is slow and the overshoot is small. The more voltage drops at the outlet of DFIG, the greater the difference is in short circuit current provided by the two control modes in an instant. At last, the vector control of the converter on the machine side is improved by adding a compensation term to the rotor current reference instruction. Simulation analysis results show that the improved vector control could effectively reduce the adverse effect of DFIG on the relay protection during the fault. This work is supported by Joint Fund Project of Guizhou Province (No. LH[2017]7231).