新型换流变压器在地铁供电中的应用

针对城轨交通供电系统的传统换流站产生的谐波和无功功率由变压器绕组注入交流网侧,既增大变压器制造成本,又产生噪音问题,提出了一种具有内部三角形绕组的自耦补偿与谐波屏蔽换流变压器,它将传统无功补偿装置移至绕组内部且公共绕组的等效短路阻抗为零阻抗设计,使二次侧各种谐波源无法进入高压网络,有效抑制了供电系统中的谐波成分,从而具备自耦补偿和谐波屏蔽功能。对比传统的轴向双分裂式12脉波牵引整流变压器,分析新型换流变压器的谐波电流后计算出了变压器网侧电流特征谐波。新型换流变压器可以进一步减小网侧特征谐波,且解决了传统的轴向双分裂式12脉波牵引整流变压器副边匝比问题。

Application of New Converter Transformer to Power Supply System in Subway

A novel self-coupled compensated and shielding harmonic converter transformer is proposed,its structure has advantage of self-coupled function of transformer and originates moving the reactive compensation equipment to the inner windings,which will greatly decrease the voltage scale of reactive compensation equipment.For shielding harmonic efficiently,the equivalent short-circuit impedance of communal windings in the novel converter transformer is designed being close to zero,which will make all harmonic sources not to influence the high-voltage network and ameliorate the harmonic component in the power supply system.In the paper application outlook of the new converter transformer in the metro power supply system is mostly studied,compared with the traditional axis-double-splited 12-wave traction rectifier transformer,harmonic current of the new converter transformer is analyzed,and the characteristic harmonics current for the first winding are calculated.Owing to the harmonic-shielded function of the new converter transformer,characteristic harmonics current for the first winding can be reduced enormously,and the turns ratio problem of the second windings for the traditional axis-double-split 12-wave traction rectifier transformer also can be solved.