高速磁悬浮双端并联供电模式下环流特性研究

为适应高速磁悬浮列车在高速运行状况下需要较大牵引功率,同时减小线路损耗、提高可靠性,通常采用牵引变流器双端并联供电模式为磁悬浮列车提供牵引动力。基于仿真分析,通过建立双端供电模式下高速磁悬浮列车牵引供电模型,研究双端供电电缆环流形成机理,分析不同牵引变流器输出电流幅值、频率、相位及不同线路参数下双端供电环流特性。结果表明:变流器双端并联供电模式下馈线电缆环流主要由变流器输出相位错相及馈线电缆参数变化引起,环流大小与线路电感值成反比,当馈线电缆较短时,可通过在牵引变流器输出侧串联输出电抗器,减少馈线电缆环流。以上结论可为高速磁悬浮双端供电模式下环流抑制提供理论基础。

Study on Circulating Current Characteristics in Dual-end Parallel Power Supply for High Speed Maglev

In order to adapt to high speed maglev trains that require greater traction power under high-speed operating conditions while reducing line loss and improving reliability, the dual-end parallel power supply mode of traction converters is usually used to provide traction power for maglev trains. Based on simulation analysis, by establishing a traction power supply model for high speed maglev trains in dual-end power supply mode, the formation mechanism of circulating current of cable in dual-end power supply mode is studied, and the output current amplitude, frequency, phase as well as the characteristics of circulating current in dual-end power supply mode with different line parameters are analyzed. The results show that the circulating current of the feeder cable in dual-end parallel power supply mode of converter is mainly caused by the output phase error of converter and the change of feeder cable parameters. The circulating current is inversely proportional to the line inductance.When the feeder cable is short, the output side of traction converter can be connected to the output reactor to reduce the circulating current of feeder cable. The conclusions above can provide a theoretical basis for circulating current suppression in dual-end power supply mode for high-speed maglev.