A New Rectifier for Industrial Use

Abstract

The article describes the design of a rectifier with 12 output voltage ripples with improved dimensions and weight of a three-phase transformer, and hence the entire rectifier as a whole. The greatest effect from its use will be achieved in powerful industrial systems and DC power lines. In addition, the absence of a delta winding reduces losses when operating on an unbalanced load, or when voltage fluctuates in the phases of the supply network. A comprehensive comparison of the advantages of this rectifier in comparison with the classic 12-pulse rectifier with two bridges and star-delta windings has been carried out. Theoretical results are confirmed using a 3D model for a transformer operating as part of a rectifier. Dependences of the advantages in size for different powers in the range from 1-63 MVA, as well as graphs for the currents consumed from the supply network at different thyristor control angles, were obtained. The presented materials make it possible to evaluate the quality of this rectifier in comparison with the classical one. The connection diagram of the windings of a three-phase transformer is not known, and is proposed by the authors of the article for the first time; in some cases, it can be used to power a 6-phase load, subject to certain conditions.