Auxiliary power system

An embodiment of the utility model provides an auxiliary power system, include traction transformer, traction current transformation ware, draw motor, auxiliary converter, wherein, traction transformer's vice limit winding is including pulling winding and auxiliary winding, it is continuous with traction transformer's former limit that the contact net passes through the pantograph, pulling the winding and being connected with the traction current transformation ware, the traction current transformation ware is connected with traction motor, auxiliary winding and auxiliary converter are connected, and auxiliary converter is connected with supplementary load. In this scheme, utilize and to draw the route that has the energy coupling transmission between winding and auxiliary winding, draw the winding and keep the electric current that lasts in order to keep through traction motor regenerative brake to be coupled to auxiliary winding and do not cut off the power supply, guaranteed EMUs and when crossing the phas