电力机车过分相区时牵引变压器辅助绕组不间断供电技术方案研究

摘要

电力机车和动车组的辅助系统供电电源有两种途径：一种是从牵引变压器的辅助绕组获得交流电，另一种是从牵引变流器的中间直流环节获得直流电。本文提出一种解决方案，使得机车在过分相区接触网无电期间，牵引变压器的辅助绕组仍能不间断给辅助系统供电，还能确保受电弓进出分相区时不产生过电压和过电流。该解决方案使得辅助系统由牵引变压器辅助绕组供电的机车或动车，经过适当改变控制策略就可以实现过分相区时变压器辅助绕组不间断供电，从而维持辅助系统正常工作。仿真和实验结果验证了所提技术方案的正确性和有效性。%Auxiliary systems of electric locomotives and EMUs mainly have two methods of taking power,i.e., from auxiliary windings of the main transformer and from the DC-link of traction converters.In this paper,a novel scheme was proposed which facilitated supply of regenerative braking power to auxiliary systems and a-voided occurrence of overvoltages and inrush currents when pantographs passing neutral sections.Also this scheme accomplished uninterrupted power supply from auxiliary windings simply by changing the control strat-egy.Simulation and experimental results verify the correctness and effectiveness of the proposed method.