Abstract: Different from the conventional power unit,when a short-circuit fault occurs in a transmission line,the crowbar protection in the wind turbine may act,which will lead to the decrease of the wind turbine speed and the short-circuit current frequency deviation at the wind turbine side. Thus,the measured impedance calculated based on the fundamental frequency short-circuit current will deviate from the actual value,causing inaction or mis-operation of the traditional distance impedance protection. To solve this problem,this paper proposes an impedance amplitude differential protection method of distribution networks considering short-circuit current deviation characteristics. Firstly, the short-circuit current deviation characteristics of wind turbine are explored,and the short-circuit current deviation error model is established. Secondly, the influence mechanism the shortcircuit current has on the distance protection is studied based on the impedance diagrams. Thirdly, based on the significant difference between differential impedance and braking impedance in normal operation,external fault and internal fault,the impedance amplitude differential characteristics are extracted,and the impedance protection amplitude differential criterion is constructed,which is not affected by short-circuit current deviation value. Finally, the simulation analysis is carried out based on PSCAD/EMTDC. The results show that the protection method in this paper can act accurately regardless of the wind power ratio and the short-circuit current deviation,and the transition resistance can improve the sensitivity of internal fault and the reliability of external fault protection.