Locomotive traction storage battery discharge balancing circuit and control method

The invention discloses a locomotive traction storage battery discharge balancing circuit and a control method. The power supply configuration relation between two groups of traction storage batteriesand a VVVF auxiliary load and a CVCF auxiliary load of two groups of auxiliary converters is adjusted by controlling the actions of four switching modules. When a locomotive is normally used, the total discharge capacity of each traction storage battery pack to the VVVF auxiliary load and the CVCF auxiliary load in two discharge cycle periods is default to be the depth of one discharge cycle; when the locomotive is in deep endurance, the traction storage battery with high power consumption automatically selects to supply power to the auxiliary converter with the lower auxiliary load, so thatthe endurance of the locomotive is improved, and the service life of the traction storage batteries is prolonged. 本发明公开了一种机车牵引蓄电池放电平衡电路及控制方法，通过控制四个切换模块动作，调整两组牵引蓄电池与两组辅助变流器的VVVF辅助负载和CVCF辅助负载的供电配置关系。机车正常运用时，使每个牵引蓄电池组默认在两个放电循环周期内