交直交传动方式下的车网低频振荡研究

如果牵引网电压持续低频率大幅度振荡,会影响机车或动车牵引系统网压的保护,导致变流器牵引封锁,影响列车正常运行。针对近年来我国多地发生牵引网电压的低频振荡现象,通过阻抗比判据和Bode图分析车网振荡主要影响因素,再根据计算机仿真验证车网振荡的影响因素,在不增加任何硬件电路的前提下,提出通过优化控制参数来抑制车网低频振荡的方法。通过半实物仿真研究,验证了该方法的可行性。

Research on Train Grid Low-frequency Oscillation Based on AC-DC-AC Drive Mode

If the low-frequency and large-scale oscillation of the traction grid voltage continues, the grid voltage protection of locomotive or EMU traction system will be influenced, resulting in converter traction blocking and affecting the normal operation of the train. In view of this practical engineering problem, the main influencing factors of train network oscillation were analyzed with impedance ratio criterion and Bode diagram, and verified according to computer simulation. Without adding any hardware circuit, the method of suppressing low-frequency oscillation of pantograph catenary by optimizing control parameters was proposed. The feasibility of the method was verified by hardware in the loop simulation.