Carrier-Based PWM Method to Reduce Common-Mode Voltage of Three-to-Five-Phase Indirect Matrix Converter

Rutian Wang,Qiufeng Chen,Xingjun Mu,Xue Wang,Zhiqiang Wu,Lihui Zhu

doi:10.1155/2016/6086497

Abstract

In order to reduce the common-mode voltage (CMV) for three-to-five-phase indirect matrix converter (IMC), the CMV with the conventional modulation strategy is analyzed. A novel carrier-based PWM (CBPWM) method is proposed in this paper. The zero vectors in the inverter stage are assigned to the rectifier stage, equivalently, which are not considered in the inverter stage. The zero vectors are selected appropriately to ensure that the dc-link is connected to an input phase with the minimum absolute value, so that the larger CMV can be avoided. Then, the modulation signals are derived by the duty ratios, which are used to compare with the only one carrier signal and generate the gate pulses of switches. With the proposed method, the CMV is reduced effectively compared with the conventional modulation strategy. This method is analyzed and researched with a simulation model established by Matlab/Simulink. Simulation results are provided in detail to verify the feasibility and validity of the proposed method.

Highlights

With the rapid development of the power electronic converter, the drive system gradually gets rid of the bound of the phase number
The three-tofive-phase direct matrix converter (DMC) was proposed in [7], and there are fifteen bidirectional switches connected in series; each output phase can connect with each input phase
In view of the above problems, a carrier-based PWM (CBPWM) method is proposed in this paper to reduce the common-mode voltage (CMV) of three-to-five-phase indirect matrix converter (IMC)

Summary

Introduction

With the rapid development of the power electronic converter, the drive system gradually gets rid of the bound of the phase number. The benefits of three-to-five-phase IMC are similar to those of a three-to-five-phase DMC, such as no required large energy storage components, compact structure, bidirectional energy flow, unrestricted output frequency, a controllable input power factor, and a maximum voltage transfer ratio (VTR) of 0.7886 [7] It has additional advantages such as zero current safer commutation and less switching losses in the rectifier stage and less total number of power switches [11]. In view of the above problems, a carrier-based PWM (CBPWM) method is proposed in this paper to reduce the CMV of three-to-five-phase IMC This method focuses on the reasonable distribution of the zero vectors in both stages, so that the value of CMV is reduced.

Topology and Modulation Principles of Three-to-Five-Phase IMC

B C uc c

The CBPWM Method with CMV Reduction

Simulation Results

Conclusion