Diode Rectifier with Improved Quality Indicators for Electrical Energy

Abstract

In this work, we present a three-phase diode bridge rectifier with a power line current close to a sinusoidal shape. To benefit from this approach, a solution called ‘current modulation’ is used in the DC link of the rectifier. The main advantage of this system is that the power supplied to the current modulation stage is only a small percentage of the entire power system, meaning that this solution is especially attractive in the case of high-output power systems, for example, for supplying electrical traction. The essential aspect of the current modulation stage is a wide-pass band power electronics controlled current source (VCCS), which is based on a dual-channel (interleaved) topology. The control algorithm for the current modulation stage also takes into consideration the impact of aliasing phenomena on the stability of the system, and uses a control method proposed by the authors. This work contains a general description of the operation of this rectifier and presents basics of operation for the current modulation stage. Selected results from both a simulation of the rectifier and an experimental model are included.