# Analysis of Three-phase Rectifier via Three Different Control Methods and Switch Power Loss Comparison

## Abstract

Traditional uncontrolled or phase-controlled rectifiers have the defects of lower power factor and nontrivial higher harmonics which causes the low efficiency of power, bad power quality, and so on. However, PWM rectifiers overcome the drawbacks mentioned above. They reduce the higher harmonics yielding better sinusoidal current on the grid side, achieve unity power factor and bidirectional power flow, and have better dynamic performance. So, it is favored more by academia and widely applied in high-performance power electronics devices. In this paper, the PWM rectifier is analyzed and a comparison of the switch loss on three-phase rectifier using three different control methods is completed in MATLAB / Simulink. Analysis of the PWM rectifier includes analysis of the common topologies of the rectifier, the mathematical model of three-phase rectifier and control methods of three-phase rectifiers. First, the common types and the corresponding topologies of the rectifier are analyzed. Second, the mathematical models of three-phase PWM rectifier are analyzed. In the general mathematical models, there are two types of models. One is based on a switch function and the other one is based on duty ratio. Furthermore, the mathematical model of three-phase rectifier in the d-p coordinate system is analyzed. Three different control methods on three-phase rectifiers are analyzed including hysteresis control, double-loop decoupling SPWM (Sinusoidal Pulse Width Modulation) control and double-loop decoupling SVPWM control. Then explained in detail is the SVPWM modulation principle and its realization. The simulations of three different control methods on three-phase rectifiers are built in MATLAB / Simulink. The dynamic responses of the three different methods are shown. The switch model used in the simulation is introduced. Finally, the comparison of the power loss on the three different methods is completed.

Vincent Winstead

Jianwu Zeng

Han-Way Huang

2021

english

Thesis

## Degree

Master of Science (MS)

## Department

Electrical and Computer Engineering and Technology

## College

Science, Engineering and Technology

## Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.

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