阻抗匹配三相变四相变压器数学模型及应用研究

根据阻抗匹配三相变四相平衡变压器原理,运用多绕组变压器理论,建立了阻抗匹配三相变四相平衡变压器数学模型并分析了该变压器在不同负荷条件下的运行特性,提出了该变压器应用于AT牵引供电系统的接线方案并讨论了该接线方案的电气特性.研究表明,阻抗匹配三相变四相平衡变压器能实现三相与四相交流电的平衡对称转换,在抑制因负荷不平衡而产生的负序电流方面较通用的三相平衡变压器优势明显,在电气化铁道AT牵引供电系统有广阔的应用前景.

Study on the Mathematical Model of Three-phase to Four-phase Impedance Matching Balance Transformer and its Application

A mathematical model was built on the principle of the three-phase to four-phase impedance matching balance transformer and the theory of multi-wiring transformer. Meanwhile, the performance characteristic of the transformer under different loads was analyzed. The transformer applied in AT traction power supply system wiring scheme was presented,and its electrical characteristic of wiring scheme was discussed. The research has shown that the impedance matching transformer can not only realize the balanced symmetrical conversion of three-phase to four-phase, but also has an obvious superiority in restraining the negative sequence current caused by the lopsided load.