负阻抗会引起地铁车辆牵引变流器直流侧电压、电流振荡，降低牵引传动系统稳定性。
Negative impedances lead to DC-link voltage and current oscillation in metro traction converters and so to reduction of stability of traction drive systems.
电传动是电动汽车的关键技术之一，它由牵引电机、牵引变流器、控制系统三部分组成。
Electric drive, consists of traction motor, traction converter and control system, is one of the key technologies of electric vehicle.
本文建立地铁牵引变流器关注直流侧的系统小信号模型，详细分析直流侧振荡的产生机理。
In this paper the small signal model following the DC-link of the traction converter system is established and the mechanism of DC-link voltage and current oscillation is analyzed in detail.
熟悉主要部件如变压器，电机，变流器，齿轮箱，牵引系统及列车控制系统等。
Prefer those with knowledge about the main components such as transformer, converter, gear box, motor, traction system, train control system etc.
讨论了大功率牵引用几个PWM变流器的并联运行。
This paper deals with the parallel operation of several Numbers of PWM converters for a high power traction application.
通过四象限变流器交流侧矢量图的分析，阐述牵引绕组间的互感对四象限变流器控制性能的影响。
According to the analysis of ac vector diagram, the effect of the mutual inductance among the traction windings on the control (performance) of the 4qc is discussed.
加之在列车动力系统安装先进牵引电机系统、变流器系统等，设计出的整车噪音较传统产品减少两成以上。
The above-mentioned parts along with advanced traction motor system and converter system bring the noise down by 20% compared with those of traditional products.
根据四象限变流器状态方程稳定性分析，指出互感值的取值必须小于牵引绕组的漏感值。
Based on the analysis of the stability of the 4qc state equation, the value of mutual inductance should be smaller than that of leakage inductance of the traction windings.
根据四象限变流器状态方程稳定性分析，指出互感值的取值必须小于牵引绕组的漏感值。
Based on the analysis of the stability of the 4qc state equation, the value of mutual inductance should be smaller than that of leakage inductance of the traction windings.
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