Zig-zag变压器的建模与应用

在低压配电网中零序性谐波日益严重的情况下,曲折接线(Zig-zag)变压器为抑制零序性谐波提供了一种比较新颖的方法。针对配电系统中所存在的零序性电流,首先在理论分析的基础上,建立了Zig-zag变压器的分析模型,并针对三相不平衡负载和三相不平衡电源及作为整流变压器应用这3种情况进行了仿真分析,通过分析可以知道Zig-zag变压器在三相不对称运行时可以相互补偿铁芯的磁通量,最大限度地控制各相感应电动势的一致性,从而保持三相平衡,降低零线电流。

Modeling and application of Zig-zag transformer

As the zero-sequence harmonics of low-voltage distribution systems become more serious,Zig-zag transformer is used to attenuate the zero-sequence harmonic currents.The Zig-zag transformer analysis model is established on the basis of theoretical analysis.Simulative analysis is carried out for its applications to three-phase unbalanced load and three-phase unbalanced source,which indicates that,the flux of Zig-zag transformer can be counteracted when it operates under three-phase unbalance conditions and the electromotive forces of each phase is furthest controlled to keep three-phase balance and reduce zero-sequence current.