Research and implementation of static arcless OLTC transformer

The OLTC (on-load tap changer) transformer 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.