Conditions for Recharging the Capacitors of the Commutating Device of a Three-Phase Bridge Compensation Converter

Abstract

The development of the authors is aimed at creating a modern power electronics device with high energy characteristics. In the scheme of a three-phase bridge compensation converter, the role of the commutator is a performed by a three-phase group of fully controlled devices. This technical solution allows for controlled recharging of the commutating link capacitors. In this case, the ultimate goal is to create such conditions for the formation of a commutating voltage, which, in shape and magnitude, is capable of providing a compensation mode of operation of power electric diodes. The conditions for recharging the capacitors of the commutating link were studied in three modes: the adjustment is carried out within the limits of the operation of the diodes of its phase, the next and the previous one. The conditions under which a three-phase bridge converter is able to operate effectively in a compensation mode are proved. To do this, when recharging the capacitor bank, a group of fully controlled devices of the commutated link must be regulated within the operation of the power electric diode of its own or subsequent phase. Comparison of the characteristics of the commutating voltage for different modes of its formation is carried out by the method of harmonic analysis. References 8, figures 5, tables 2.