静态无弧有载自动调压配电变压器研究与实现

Research and Implementation of Static Arcless OLTC Transformer

有载调压是动态解决电压质量问题的有效手段。常规机械式有载调压变压器存在调压模块体积大、速度慢、有环流等问题。本文提出一种基于电力电子过渡支路的调压拓扑及调压方法,通过控制电力电子开关的过零切换和切换开关的状态变换,实现调压绕组的平滑切换,从而实现调整高压侧等效匝数。仿真分析和实物样机实验表明,该方案可很好地实现变压器的宽幅无弧自动调压,具有实际应用价值。

The OLTC(on-load tap changer)is an effective means to solve the voltage quality problem dynamically.There are many problems for conventional mechanical OLTC transformers,such as small regulating amplitude,low precision,slow speed and circulating current.In this paper,a voltage regulation topology and method based on power electronic transition branch is proposed.By controlling the zero-crossing switch of power electronic switch and the state transformation of the switch,smooth switching of the regulating windings is realized,so as to adjust the equivalent turns on the high voltage side.The simulation analysis and prototype experiment show that the scheme can realize the wide range arcless automatic voltage regulation and has practical application value.