| 引用本文: | 熊进飞,周福林,陈志远,李群湛.车网耦合作用下励磁涌流对机车变流器电流频谱的影响[J].电力自动化设备,2020,40(1): |
| XIONG Jinfei,ZHOU Fulin,CHEN Zhiyuan,LI Qunzhan.Effect of inrush current on locomotive converter output current spectrum under coupling of train and network[J].Electric Power Automation Equipment,2020,40(1): |
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| 摘要: |
| 电力机车或动车组的车载牵引变压器在过分相合闸和弓网离线后恢复供电均会产生励磁涌流，但对于励磁涌流作用下的变流器运行特性研究不够深入。首先，从时域上分析了励磁涌流的产生机理，指出涌流会使车载变压器一、二次侧电压发生跌落，恶化变流器的输入侧电能质量；从频域上推导了涌流的频谱表达式，指出涌流含有较大的低次谐波和丰富的高次谐波。其次，给出了励磁涌流与牵引网阻抗耦合引起牵引网谐振现象的机理，结合机车的瞬态电流控制策略，给出了包含涌流、牵引网、机车控制策略在内的车网耦合数学表达式。理论分析表明：励磁涌流的激励使牵引网电压畸变，在畸变的牵引网电压作用下，变流器输出电流的主要频谱分布含有与牵引网谐振点一致的非特征次频谱，该非特征次频谱分量能够维持牵引网持续谐振。最后，基于MATLAB/Simulink搭建了系统的仿真模型，验证了理论分析的正确性。 |
| 关键词: 非特征次频谱 励磁涌流 车网耦合 电分相 谐振 瞬态电流控制策略 |
| DOI：10.16081/j.epae.202001022 |
| 分类号:TM922.3;TM46 |
| 基金项目:国家重点研发计划项目(2016YFB1200401-102H)；中央高校基本科研业务费专项资金资助项目(2682016-CX036)；四川省科技计划(2018GZ0044) |
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| Effect of inrush current on locomotive converter output current spectrum under coupling of train and network |
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XIONG Jinfei, ZHOU Fulin, CHEN Zhiyuan, LI Qunzhan
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School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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| Abstract: |
| Inrush current will be generated under the condition of the power restoration of the on-board traction transformer when train passes through neutral section and pantograph separates from catenary. However, the research on operation characteristics of the locomotive converter under the influence of inrush current is not enough. Firstly, the generation mechanism of the inrush current is analyzed in time-domain, which shows that inrush current may cause the primary and secondary voltage drop and degrade the power quality at the input side of the locomotive converter. The inrush current spectrum expression is deduced in frequency-domain, which indicates that inrush current contains large low-order harmonics and rich high-order harmonics. Secondly, the resonance mechanism of the traction network caused by the coupling of inrush current and traction network impedance is analyzed. Furthermore, combined with the transient current control strategy of the locomotive, the mathematical expression consisting of inrush current, traction network and locomotive control strategy is obtained. Theoretical analysis shows that under the action of distorted traction network voltage energized by the inrush current injected to the traction network, the output current spectrum of the locomotive converter contains the non-characteristic spectrum that is consistent with the resonant frequency of the traction network, and the non-characteristic spectrum component can maintain the resonance of the traction network. Finally, the simulation model is established based on MATLAB/Simulink, and the correctness of theoretical analysis is verified. |
| Key words: non-characteristic spectrum inrush current coupling of train and network neutral section resonance transient current control strategy |
