This article introduces the main type of fault for the power car of type DJJ 1 EMU,then analyzes the basic work ing prin ciple of the disabled part and brings up the improvement project for the control system.

• 针对DJJ1型高速交流传动电动车组(“蓝箭”号)动力车的主要故障类型,分析了其基本工作原理,并提出了控制系统改进方案。