基于电子开关的高精度宽幅有载调压配电变压器研究

Research on High Accuracy and Wide Range OLTC Transformer Based on Power Electronic Technology

目前,有载配电变压器通常采用机械式调压切换开关,其存在控制系统结构复杂、体积大、调节速度慢、故障率高的问题;现有部分依靠晶闸管过渡的有载调压变压器也存在调压幅度小、精度低、分接线圈多的问题。该文提出一种新型电子调压拓扑结构及调压方法,通过控制各个开关模块中电子开关单元的通断,矢量改变调压绕组接入状态,改变高压绕组等效匝数,从而实现变压器无弧、快速、频繁、精确调压。

At present, most OLTC（on-load tap changer） distribution transformers adopts mechanical switches, which has the problems of complicated structure, big volume, slow adjustment, high failure rate, etc. Existing thyristor regulation of OLTC distribution transformers also has many disadvantages such as small voltage regulation range, low accuracy, and too many regulating windings. This paper presents a new electronic voltage regulator topology and voltage regulation method. By controlling on-off of electronic switch unit in each switch module, the vector changes access state of the regulator winding and equivalent number of turns of high voltage winding, thus realizing arcless, rapid, frequent and accurate voltage adjustment.