电力机车励磁涌流消除系统的研究

Research of inrush current elimination system of the electric locomotive

针对电力机车过分相区时合闸励磁涌流对电力机车及牵引网的电能质量造成的影响,提出了一种基于大功率电力电子技术的电力机车励磁涌流消除系统原理,并提出了同相调幅法和变频移相法两种PWM调制电压算法。该系统通过控制新型大功率电力电子电路整流、逆变、变频模式及机车变压器不同时刻励磁电压,实现电力机车无冲击平滑换相通过分相区,在出分相区合闸瞬间不产生冲击性励磁涌流。利用所提方法建立了该电力机车变压器分区换相系统的仿真模型。通过仿真分析表明,所提出的两种电压调制算法,均能有效抑制合闸励磁涌流的产生,验证了所提方法的可行性。

For electric locomotive passing neutral section system, the magnetizing inrush current has adverse effect both on the electric locomotive itself and the power quality of traction power system. A new principle of electric locomotive inrush current elimination system based on high power electronic technology is proposed, meanwhile two kinds of PWM modulation voltage algorithms, namely cophase amplitude modulation and frequency conversion phase shift, are presented. By controlling the new high power electronic circuit rectifier, inverter, frequency conversion mode and locomotive transformer excitation voltage at different times, it achieves electric locomotive non-inrush passing neutral section and removes the inrush current when the transformers are switched on. Using the proposed method, the simulation model of electric locomotive transformer for passing neutral section is established. Simulation results show that two kinds of voltage modulation algorithms can effectively inhibit the switching inrush current generation, verifying the effectiveness of this method.