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The stability of an urban rail transit traction power supply system is related to the safety of urban power grid and the stable operation of traffic. Due to the large amounts of cables and a series of power electronic devices which have been put into use, problems such as harmonics and reactive power will arise and seriously damage the safety of the traction power supply system. As the core equipment of the traction power supply system, the traction transformer has important functions such as transmitting power supply and filtering nonlinear load harmonics. DC bias is a widespread phenomenon adversely affecting the traction transformer, and it may directly threaten the safe and stable operation of the traction transformer. Based on PSCAD/EMTDC and ANSYS, the UMEC model and finite element model of a novel traction transformer are established, respectively. By means of multi-platform hybrid simulation, the electromagnetic, loss and other excitation characteristics of this traction transformer under DC bias are observed and analyzed. With a comparison with the traditional traction transformer, the excitation situation of the novel traction transformer under DC bias is evaluated.
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城市轨道交通牵引供电系统的稳定关乎城市电网的安全和交通稳定运行,由于大量投入使用的电缆和一系列电力电子装置,产生了严重破坏牵引供电系统安全性的谐波和无功问题。牵引变作为牵引供电系统的核心设备,具有传输供电和滤除非线性负载谐波等重要作用,直流偏磁是1种广泛存在的会对牵引变产生不利影响的现象,严重时会直接威胁牵引变的安全稳定运行。基于PSCAD/EMTDC 及ANSYS分别建立了1种新型牵引变的UMEC 及有限元模型,由励磁电流特性入手,通过多平台混合仿真的手段对这一新型牵引变遭受直流偏磁影响时的电磁、损耗等励磁特性进行了观测和分析,并与传统牵引变进行对比,评估了该新型牵引变遭遇直流偏磁时的励磁状态。
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 |
杨柳林(1977-),男,通信作者,博士,副教授。研究方向:电力系统分析与计算、深度学习、大数据及其应用。E-mail:kk456678910@gmail.com。 |
王韬策(1996-),男,硕士研究生。研究方向:电力系统及其自动化、电能质量。E-mail:799047323@qq.com。
王涛(1977-),男,高级工程师。研究方向:特种变压器。E-mail: ttw0229@163.com。
李永革(1969-),男,高级工程师。研究方向:特种变压器。E-mail: ly740215@163.com。
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51(5): 40-46 (in Chinese)., articleTitle=Simulation study of DC bias loss characteristics of 500 kV power transformer, refAbstract=null)], funds=[Fund(id=1154032962057261914, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, awardId=AB18126026, language=EN, fundingSource=Major Research Project of Guangxi Science and Technology Department(AB18126026), fundOrder=null, country=null), Fund(id=1154032962103399259, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, awardId=AB18126026, language=CN, fundingSource=广西科技厅重大研究资助项目(AB18126026), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1154032954994053892, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, xref=1, ext=[AuthorCompanyExt(id=1154032954998248197, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, companyId=1154032954994053892, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Excitation current and frequency spectrum distribution of traditional and novel traction transformers(without bias), figureFileSmall=luvPwMLcige5E3dpA+R9xA==, figureFileBig=7/iETEyyL4ihkS3yTYHqcw==, tableContent=null), ArticleFig(id=1154032959263855427, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=图4, caption=
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Excitation current and frequency spectrum distribution of traditional and novel traction transformers(under DC bias), figureFileSmall=XFw6qVdCT/wqaQtWDc77YQ==, figureFileBig=aw5a1XoMiYaIsU6+0AH/9g==, tableContent=null), ArticleFig(id=1154032959389684549, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=图5, caption=
传统及新型牵引变励磁电流及频谱分布(直流偏磁), figureFileSmall=XFw6qVdCT/wqaQtWDc77YQ==, figureFileBig=aw5a1XoMiYaIsU6+0AH/9g==, tableContent=null), ArticleFig(id=1154032959452599110, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=EN, label=Fig. 6, caption=
$B - H$ curve of core material and finite element model of novel traction transformer, figureFileSmall=J/rI7GPjct1AvX+Exi34ZQ==, figureFileBig=VzlWTWKyvceixRjZ8SnN1g==, tableContent=null), ArticleFig(id=1154032959502930759, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=图6, caption=
铁芯材料 $B - H$ 曲线及新型牵引变有限元模型, figureFileSmall=J/rI7GPjct1AvX+Exi34ZQ==, figureFileBig=VzlWTWKyvceixRjZ8SnN1g==, tableContent=null), ArticleFig(id=1154032961444893513, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=EN, label=Fig. 7, caption=
Magnetic density distribution of traction transformer core in positive and negative half cycles, figureFileSmall=wD/+HgBMEQw0d5mntNdLNA==, figureFileBig=g2hgDBLLsJh3+L2VFx3KWQ==, tableContent=null), ArticleFig(id=1154032961520390986, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=图7, caption=
牵引变铁芯正、负半周期磁密分布, figureFileSmall=wD/+HgBMEQw0d5mntNdLNA==, figureFileBig=g2hgDBLLsJh3+L2VFx3KWQ==, tableContent=null), ArticleFig(id=1154032961579111244, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=EN, label=Fig. 8, caption=
Magnetic density waveforms of traction transformers at monitoring point, figureFileSmall=eJL0whKcgmzsMLxa0htIcQ==, figureFileBig=rkVrbB7cu6JO18Zdj7oUGw==, tableContent=null), ArticleFig(id=1154032961637831502, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=图8, caption=
牵引变监测点磁密波形, figureFileSmall=eJL0whKcgmzsMLxa0htIcQ==, figureFileBig=rkVrbB7cu6JO18Zdj7oUGw==, tableContent=null), ArticleFig(id=1154032961700746066, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=EN, label=Fig. 9, caption=
Loss distribution in traction transformer core and loss waveform at monitoring point, figureFileSmall=/RHUebsfgaxNb37cnoAMfA==, figureFileBig=0zYKUD2PWlTuu6P4ZwIS8w==, tableContent=null), ArticleFig(id=1154032961763660628, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=图9, caption=
牵引变铁芯损耗分布及监测点损耗波形, figureFileSmall=/RHUebsfgaxNb37cnoAMfA==, figureFileBig=0zYKUD2PWlTuu6P4ZwIS8w==, tableContent=null), ArticleFig(id=1154032961843352406, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=EN, label=Tab. 1, caption=
Excitation current harmonics with and without DC bias, figureFileSmall=null, figureFileBig=null, tableContent=
| 变压器 类型 | 偏磁 情况 | 谐波大小及含有率 | 1 | 2 | 3 | 4 | 5 | 6 |
| 传统 牵引变 | 无偏磁 | n 次谐波含有率1% | 100 | 1.11 | 1.13 | 0.17 | 0.42 | 0.30 |
| 电流/A | 3.6472 | 0.0405 | 0.0411 | 0.0062 | 0.0155 | 0.0011 |
| 直流偏磁 | n 次谐波含有率1% | 100 | 12.88 | 16.25 | 6.93 | 9.35 | 6.40 |
| 电流/A | 7.4090 | 0.9544 | 1.2043 | 0.5137 | 0.6928 | 0.4741 |
| 新型 牵引变 | 无偏磁 | n 次谐波含有率1% | 100 | 0.29 | 0.27 | 0.12 | 0.22 | 0.17 |
| 电流/A | 3.5966 | 0.0103 | 0.0096 | 0.0043 | 0.0078 | 0.0006 |
| 直流偏磁 | n 次谐波含有率1% | 100 | 7.22 | 5.80 | 3.63 | 0.62 | 2.99 |
| 电流/A | 7.5229 | 0.5435 | 0.4400 | 0.2729 | 0.0464 | 0.2246 |
), ArticleFig(id=1154032961897878361, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153695649490002417, language=CN, label=表1, caption=
正常运行及直流偏磁下的励磁电流谐波情况, figureFileSmall=null, figureFileBig=null, tableContent=
| 变压器 类型 | 偏磁 情况 | 谐波大小及含有率 | 1 | 2 | 3 | 4 | 5 | 6 |
| 传统 牵引变 | 无偏磁 | n 次谐波含有率1% | 100 | 1.11 | 1.13 | 0.17 | 0.42 | 0.30 |
| 电流/A | 3.6472 | 0.0405 | 0.0411 | 0.0062 | 0.0155 | 0.0011 |
| 直流偏磁 | n 次谐波含有率1% | 100 | 12.88 | 16.25 | 6.93 | 9.35 | 6.40 |
| 电流/A | 7.4090 | 0.9544 | 1.2043 | 0.5137 | 0.6928 | 0.4741 |
| 新型 牵引变 | 无偏磁 | n 次谐波含有率1% | 100 | 0.29 | 0.27 | 0.12 | 0.22 | 0.17 |
| 电流/A | 3.5966 | 0.0103 | 0.0096 | 0.0043 | 0.0078 | 0.0006 |
| 直流偏磁 | n 次谐波含有率1% | 100 | 7.22 | 5.80 | 3.63 | 0.62 | 2.99 |
| 电流/A | 7.5229 | 0.5435 | 0.4400 | 0.2729 | 0.0464 | 0.2246 |
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