Research on uninterrupted power supply technology for auxiliary winding of electric locomotive when passing neutral section

Auxiliary systems of electric locomotives and EMUs mainly have two methods of taking power, from auxiliary windings of main transformer and from DC-link of traction converter. A novel scheme is proposed which makes power of regenerative braking supply to auxiliary winding in order to guarantee auxiliary system which gets power from auxiliary winding achieve uninterrupted power supply and can avoid overvoltage and inrush current when passing neutral section. Furthermore, this scheme achieves uninterrupted auxiliary power supply simply by modifying the locomotive's control strategy. Simulation and experimental results verified the feasibility of the proposed scheme.