弓网离线对牵引传动系统的影响

离线时间长短严重影响动车组受流质量,目前离线时间的划分主要根据运行管理经验,尚无理论分析。基于现场测试数据和MATLAB仿真软件,建立了包含弓网离线电弧和列车牵引变流器的仿真分析模型,分析了弓网离线时的过电压与谐波,以及离线对牵引变流器直流侧电压的影响。结果表明:弓网离线和恢复过程均有约1.3倍的过电压产生,并伴随有大量的谐波反馈到接触网上;牵引变流器直流侧压降速度随列车行驶速度的增加而呈指数增大,250 km/h以上行驶速度时1 000 V压降所需时间已经下降到100 ms以内;相同离线时间下,列车行驶速度愈大离线恢复时直流侧电压冲击和震荡愈大。上述分析表明,离线时间的划分应考虑列车行驶速度的影响,越高时速下,离线时间应作越严格的限制,以保证列车良好的受流质量。

Influence of Pantograph-catenary Disconnection on Traction System

Time length of pantograph -catenary disconnection has a great influence on current-receiving quality of high -speed railway, currently the disconnection time is divided mainly according to the operation and management experience, there is no theoretical analysis. Based on the field test data and MATLAB simulation software, this paper establishes a simulation model including pantograph-catenary disconnection arc and traction converter, and analyzes the overvoltage of pantograph-catenary disconnection arc and the impact of pantograph-catenary disconnection on DC-link voltage of traction converter. The results show that both pantograph-catenary disconnection and recovery process have about 1.3 times overvoltage and w.h a lot of harmonic feedback to catenary;the DC-link voltage drop speed of traction converter increases exponentially with the increase of train speed, the voltage drop time of 1 000 V has been reduced to less than 100 ms when traveling speed above 250 km/h;under the same disconnection time, the greater the train speed, the greater the DC-link voltage surge and shock during the pantograph-catenary recovery. Above conclusions shows that the division of disconnection time should consider the influence of train speed, the higher the speed, the disconnection time should be more strictly limit, to ensure the current-receiving quality of train.