Common mode voltage reduction of quasi‐Z source indirect matrix converter

Abstract

SUMMARYQuasi-Z source indirect matrix converter (IMC) combines both advantages of conventional IMC and quasi-Z source inverter, for example, no direct current (DC) link capacitor, compact all-silicon power converter, bidirectional power flow, input power factor controllable, and high voltage gain; moreover, it does not require additional input filter, because continuous quasi-Z source network integrates LC filter function. However, there is no literature to disclose common mode voltage (CMV) issue of quasi-Z source IMC. In this paper, for the first time, the CMV issue and reduction of quasi-Z source IMC are investigated. Firstly, the CMV of quasi-Z source IMC is analyzed when using current typical modulation method, which follows the brief introduction of topology and modulation method for quasi-Z source IMC, and the factors that affect the CMV are figured out; Secondly, referring to the CMV reduction methods of conventional IMC, two solutions named as Methods I and II to reduce the CMV for quasi-Z source IMC are developed, which are achieved in the inverter stage; the third CMV reduction method is proposed in the rectifier stage through redefining the six sectors of the rectifier stage, which can implement zero current commutation. Experimental bench is built to test three approaches for reducing the CMV of quasi-Z source IMC. Comparative evaluation is carried out between three methods and conventional modulation method. Experimental results verify that three methods can significantly reduce the CMV of quasi-Z source IMC, with the CMV peak value reduction of 42%, but they present different features in terms of input and output current THDs, switching loss, CMV root mean square (RMS) value, modulation index limitation, and so on.

Z-Source Matrix Converter: An Overview

“…From Fig. 4(a), the inductor Lx1 (x = a, b, c) voltage equals to the difference of the input voltage and the capacitor Cx1 voltage, the inductor Lx2 voltage equals to the capacitor Cx2 voltage, at nonshoot-through state, it is possible to obtain [10] :…”

“…4 (b), the capacitor Cx1 current equals to the inductor Lx2 current, the capacitor Cx2 current equals to the input current, and it is possible to obtain [10] :…”

“…Table I summarizes the evaluation of three ZS/QZSMC topologies. Furthermore, in [10] , common mode voltage (CMV) issue of the QZSIMC with continuous current mode has been investigated and three modulation strategies were developed in order to reduce the CMV for the QZSIMC with the CMV peak value reduction of 42%. Fig.…”

A novel modulation technique with interleaved‐and‐shifted shoot‐through state placement for quasi‐Z‐source inverters

“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The qZSI inherits all the advantages of the ZSI. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The qZSI inherits all the advantages of the ZSI.…”

Reliability challenge for impedance network‐based DC‐DC boost converters

“…In recent years, converters based on the mentioned structures have been proposed by researchers, which are aimed at improving the basic structures from 1 or some aspects …”