双流制供电线路变压器直流偏磁问题研究
李雪飞1孙文斌1关超1代骏2刘炜2
DC Bias in Transformers of Dual Current Power Supply Lines
LI Xuefei1SUN Wenbin1GUAN Chao1DAI Jun2LIU Wei2
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作者信息:1.中车长春轨道客车股份有限公司国家轨道客车工程研究中心，130062，长春
2.西南交通大学电气工程学院，611730，成都
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Affiliation:1.National Engineering Research Center of Railway Vehicles, CRRC Changchun Railway Vehicles Co., Ltd., 130062, Changchun, China
2.School of Electrical Engineering, Southwest Jiaotong University, 611730, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.02.005
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中图分类号/CLCN:U226.7
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栏目/Col:学术专论
摘要:
［目的］为保障双流制线路中牵引变压器的安全性，防止因直流偏磁电流过大而引起变压器振动和绕组温升增加，进而导致变压器励磁电流畸变严重的问题，有必要研究双流制供电线路变压器的直流偏磁程度。［方法］介绍了双流制线路变压器直流偏磁问题；将线路划分为不同小段，将直流区段列车视为功率源，交流区段列车和牵引变压器均视为电阻，建立双流制系统链式电路模型。采用连续线性潮流计算方法,计算某双流制线路交流区段变压器的直流偏磁电流，并将其与实测数据进行对比，验证所提计算方法的有效性与准确性。［结果及结论］变压器的直流偏磁电流在某些时刻严重超标。所提计算方法具有导纳矩阵阶数最低、计算速度快等特点，适用于双流制线路变压器的直流偏磁电流动态计算。
Abstracts:
［Objective］ To ensure the safety of traction transformers in dual current power supply lines and prevent issues such as transformer vibration and winding temperature increase caused by excessive DC bias current, which can lead to severe distortion of excitation current, it is essential to study the degree of DC bias in transformers of dual current power supply lines. ［Method］ The DC bias problem in transformers of dual current power supply lines is introduced. By dividing the line into smaller sections, with trains in the DC segment modeled as power sources, and trains in the AC segment and traction transformers modeled as resistances, a chain-circuit model for the dual current power supply system is established. Using continuous linear load flow calculation method, the DC bias current of transformers in the AC segment of a dual current power supply line is computed. The calculated results are compared with field-measured data to verify the validity and accuracy of the proposed method. ［Result & Conclusion］ The DC bias current in transformers significantly exceeds the standard at certain times. The proposed calculation method, characterized by minimal admittance matrix order and fast computation speed, is suitable for dynamic calculations of DC bias currents in transformers of dual current power supply lines.
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