Three-phase High Power Factor Rectifier Research Articles

Isolated Three-Phase High Power Factor Rectifier Based on the SEPIC Converter Operating in Discontinuous Conduction Mode

This paper presents the analysis and design of a three-phase high power factor rectifier, based on the dc-dc single-ended primary-inductance converter (SEPIC) operating in discontinuous conduction mode, with output voltage regulation and high frequency isolation. The input high power factor is naturally attained through the operational mode without the use of current sensors and a current control loop. To validate the theoretical analysis, a design example and experimental results for a 4-kW, 380-V line-to-line input voltage, 400-V output voltage, 0.998 power factor, 40-kHz switching frequency, and 4% input current total harmonic distortion laboratory prototype are presented, considering two distinct modulators. In addition, experimental results for the output voltage closed-loop control are presented.

Implementation of Space Vector Based Hysteresis Current Control for a Three-Phase High Power Factor Converter

In this paper, an implementation of a space vector modulation (SVM) based hysteresis current controller (HCC) for the control of a three-phase high power factor rectifier is proposed. The SVM-based HCC scheme is designed, simulated and implemented. The technique combines the best features of the SVM and HCC techniques. The controller determines a set of state space vectors from a region detector and then applies a space vector selected according to HCC. A set of space vectors in a region, including the zero space vector for a reduced number of switchings, is determined from the output signals of three comparators with a hysteresis band a little larger than that of the main HCC. A simple experimental implementation is proposed and the simulation and experimental results of the SVM-based HCC are discussed in the paper.

Three-phase high power factor rectifier with two NPC legs

A current-controlled switching mode rectifier with a reduced switch count is presented. The proposed rectifier is based on the neutral-point-clamped topology. Only eight power switches with voltage stress of half DC-link voltage and four clamped diodes are employed in the proposed rectifier instead of 12 power switches and six clamped diodes used in the conventional neutral-point-clamped rectifier. The purposes of the proposed control strategy are to keep the factor correction at unity, to reduce current harmonics and to regulate DC bus voltage. The analysis and mathematical model of the rectifier is derived and the control strategy is provided. The effectiveness of the proposed control scheme is verified by the experimental results.