过分相不间断供电列供系统过电压抑制研究

Study of Over Voltage Elimination with Uninterruptible Power Supply of Auxiliary Power Supply System

辅助供电系统直接从主变压器辅助绕组取电的动车组或电力机车,在过分相区时辅助系统会失去接触网的电源。为保持辅助系统供电的不间断,牵引电机需在再生制动模式工作,由电机制动产生电能经主变压器耦合后供给辅助系统。在实现上述工作过程中,HXD3型机车在列车供电系统的变压器绕组两端出现了过电压。本文对HXD3型机车列供系统的主电路进行研究,建立列供系统交流回路的等效电路和传递函数,通过研究该电路的频率响应,对电路参数进行修正,改善系统阻尼比,抑制过电压的出现。仿真和实验结果均验证所提出方案的有效性。

The auxiliary power supply system of EMUs or electric locomotives will lose power from the catenary network when EMUs or electric locomotives pass neutral section. In order to maintain uninterrupted power supply to the auxiliary system, the traction motor is required to work under the regenerative braking mode. The power generated by the motors, coupled by the main transformer, is transferred from the traction system to the auxiliary system and rail-feed-system. However, over voltage occurred at both ends of the transformer winding of the power supply system of the HXD3 locomotive during the above working process. In this paper, the main circuit of the power supply system of the HXD3 locomotive was studied, and the equivalent circuit and transfer function of the AC loop of the power supply system were established.Through the study of the frequen- cy response of the circuit, the circuit parameters were corrected to improve the damping ratio of the system and to eliminate over voltage. The simulation and experimental results both verified the effectiveness of the pro- posed scheme.