新型中性线谐波电流抑制器

New Harmonic Current Suppressor

摘要: 针对传统曲折变压器无法抑制电网电压不平衡产生的零序谐波电流，以及简单的中线串联型滤波器容易引起的中线电压偏移问题，对现有中性线谐波滤波器进行改进，设计了一种将零序滤波器与串联中线滤波器相结合的新型中性线谐波电流抑制器。并基于Matlab/Simulink对该滤波器进行仿真验证，结果表明，其既解决了三次谐波的滤波问题，又对中线零序电流起到很好的抑制作用，同时对负载的影响很小。

Abstract: This article is based on the improvement of the existing neutral-line harmonic filters. It is pro-posed that the conventional zig-zag transformer cannot suppress the zero-sequence harmonic current generated by unbalanced grid voltage, and the neutral line voltage offset problem that is easily caused by a simple neutral-line series filter is proposed. A novel neutral-line harmonic current suppression method combining a zero-sequence filter and a series-neutral-line filter is proposed. This method combines the zero-sequence filter based on zigzag transformer and the series neutral filter, which not only solves the problem of filtering the third harmonic, but also plays a good role in suppressing the midline zero-sequence current, and has little effect on the load.