3-Phase Diode Rectifier with Current Modulation in DC Circuit

Abstract

In the work the 3-phase power diode rectifier system with a quasi-sinusoidal input (power grid) current is presented. In order to benefit from it the current modulator in a DC circuit of rectifier is used. The advantage of the system is, that power of the current modulator is equal to only a few percent of the system total output power. The essential part of the modulator is the wide-band power electronics controlled current source (VCCS) based on a multi-channel converter. The control algorithm of the current modulator respects impact of aliasing phenomena at system's stability by using the method proposed by authors. The paper contains overall description of the rectifier operation as well as a structure and rules of operation of the current modulator. Also, selected results of research of the system simulation model are presented.