轨道交通供电系统中变压器直流偏磁分析
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摘要
轨道交通直流供电系统产生的杂散电流经过中性点流入主变压器,导致变压器产生直流偏磁现象。振动与噪声特性是监测变压器运行状态的基本参数。以长沙地区某220k V主变压器为研究对象,采用COMSOLMultiphysics有限元软件建立变压器三维模型并仿真分析其振动与噪声特征。对比分析变压器正常运行与直流偏磁为1A时变压器的应力、位移变化、振动加速度和声场空间分布,并进行现场测量噪声与试验振动特性,验证了仿真模型的正确性。从仿真与试验两个方面验证得出发生直流偏磁时主变压器的振动与噪声将加剧,对变压器正常运行产生重大影响。这为开展轨道交通供电系统中主变直流偏磁状态监测与抑制提供理论支持,对其他类型变压器直流偏磁现象的研究也有借鉴意义。
The stray current generated by the rail transit DC power supply system flows into the main transformer through the neutral point, which causes the transformer to generate DC bias. The vibration and noise characteristics are the basic parameters for monitoring the normal operation state of the transformer. By taking a 220 k Vmain transformer in Changsha as the research object, the three-dimensional model of the transformer is built by the COMSOL Multiphysics finite element software, and its vibration and noise characteristics are simulated. In this paper, the stress, displacement variation, vibration acceleration and spatial distribution of the transformer are compared and analyzed. The correctness of the simulation model is verified. It is verified from the two aspects of simulation and experiment that the vibration and noise of the main transformer will be intensified when DC bias is generated, which will have a significant impact on the normal operation of the transformer. It provides a theory for monitoring and suppressing the main transformer DC bias state in the rail transit power supply system. Moreover, the study of the DC bias phenomena of other types of transformers can be used for reference.
The stray current generated by the rail transit DC power supply system flows into the main transformer through the neutral point, which causes the transformer to generate DC bias. The vibration and noise characteristics are the basic parameters for monitoring the normal operation state of the transformer. By taking a 220 k Vmain transformer in Changsha as the research object, the three-dimensional model of the transformer is built by the COMSOL Multiphysics finite element software, and its vibration and noise characteristics are simulated. In this paper, the stress, displacement variation, vibration acceleration and spatial distribution of the transformer are compared and analyzed. The correctness of the simulation model is verified. It is verified from the two aspects of simulation and experiment that the vibration and noise of the main transformer will be intensified when DC bias is generated, which will have a significant impact on the normal operation of the transformer. It provides a theory for monitoring and suppressing the main transformer DC bias state in the rail transit power supply system. Moreover, the study of the DC bias phenomena of other types of transformers can be used for reference.
引文
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[15]魏浩,邹海荣,吴增强.直驱永磁风力发电机并入10k V配电网的研究[J].上海电机学院学报,2014,17(3):169-174.
[16]籍海亮,迟长春,刘红松,等.基于ANSYS的永磁接触器温度场分析[J].上海电机学院学报,2016,19(4):211-215.
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[18]LIU L,YAN X,CHENGLIAN A,et al.Research of converter transformer marshalling and recei-vingend grid structure.s effect on converter transformer DC bias[J].Power System Technology,2016,43(9):544-550.
[19]彭平,周卫华,谢耀恒,等.关于地铁杂散电流引起的变压器直流偏磁的分析与研究[J].变压器,2017(11):26-30.
[20]蔡茂,李佳,彭卿,等.城市地区主变直流偏磁研究与处理[J].电气自动化,2017,39(1):7-9.
[2]李岩,高延超,韩芳旭.直流偏磁下单相变压器磁场与声场的计算分析[J].电力系统及其自动化学报,2014,26(4):9-14.
[3]蒯狄正,万达,邹云.直流偏磁对变压器的影响[J].中国电力,2004,37(8):41-43.
[4]文习山,郭婷婷,何智强,等.直流偏磁相关问题研究综述[J].高压电器,2016,52(6):1-8.
[5]李晓萍,文习山,蓝磊,等.单相变压器直流偏磁试验与仿真[J].中国电机工程学报,2007,27(9):33-40.
[6]李晓萍,文习山,樊亚东,等.直流入侵三相三柱变压器励磁电流及谐波计算[J].高电压技术,2006,32(5):69-72.
[7]李晓萍,文习山.三相五柱变压器直流偏磁计算研究[J].中国电机工程学报,2010,30(1):127-131.
[8]肖华,吴广宁,蒋伟,等.基于有限元法的单相变压器直流偏磁仿真研究[J].高压电器,2010,46(9):39-42.
[9]MASOUM M,MOSES S.Impact of balanced and unbalanced direct current bias on harmonic distortion generated by asymmetric three-phase three-leg transformers[J].Electric Power Applications,2010,4(7):507-515.
[10]梅桂华,梁文进,刘艳村,等.变压器直流偏磁电流阻容抑制装置的开发应用[J].高电压技术,2009,35(10):2581-2585.
[11]DUAN L,JIANG A,FU Z,et al.Impact of multiple HVAC system monopolar operation on DC magnetic biasing in West Shanghai UHVAC substation[J].Power System Technology,2014,9(5):78-84.
[12]ZHU S,MING C,DONG J,et al.Core loss analysis and calculation of stator permanent-magnet machine considering DC-biased magnetic induction[J].Industrial Electronics IEEE Transactions on,2014,61(10):5203-5212.
[13]徐浩铭,熊刚.变压器电磁振动噪声模型及有源消声降噪研究[J].企业技术开发,2014,33(16):9-12.
[14]颜楠楠,周琴,杨建平,等.1000k V特高压电力变压器试验标准比较分析[J].上海电机学院学报,2014,17(2):161-164.
[15]魏浩,邹海荣,吴增强.直驱永磁风力发电机并入10k V配电网的研究[J].上海电机学院学报,2014,17(3):169-174.
[16]籍海亮,迟长春,刘红松,等.基于ANSYS的永磁接触器温度场分析[J].上海电机学院学报,2016,19(4):211-215.
[17]QUAN J,TONG X,WEN X,et al.Mitigation of transformer DC bias in complicated operation conditions[J].High Voltage Engineering,2015,41(7):2464-2472.
[18]LIU L,YAN X,CHENGLIAN A,et al.Research of converter transformer marshalling and recei-vingend grid structure.s effect on converter transformer DC bias[J].Power System Technology,2016,43(9):544-550.
[19]彭平,周卫华,谢耀恒,等.关于地铁杂散电流引起的变压器直流偏磁的分析与研究[J].变压器,2017(11):26-30.
[20]蔡茂,李佳,彭卿,等.城市地区主变直流偏磁研究与处理[J].电气自动化,2017,39(1):7-9.