A Novel Dual Switching Frequency Modulation for Z-Source and Quasi-Z-Source Inverters | IEEE Journals & Magazine | IEEE Xplore

A Novel Dual Switching Frequency Modulation for Z-Source and Quasi-Z-Source Inverters


Abstract:

Impedance network inverters are the best alternatives for voltage-source and current-source inverters. The boosting capability and the shoot-through solution of such conv...Show More

Abstract:

Impedance network inverters are the best alternatives for voltage-source and current-source inverters. The boosting capability and the shoot-through solution of such converters make them excellent solutions for various applications. Nevertheless, hard switching forces the converter to operate in low switching frequency, which results in a bulky impedance network. Moreover, the coupling between the shoot-through duty cycle and the inverter modulation index makes a tradeoff between the voltage gain and the modulation index (output voltage harmonics). This paper presents a novel dual switching frequency modulation to mitigate the switching losses of the converter, which results in a more compact impedance network. The proposed method combines a high-frequency pulse width modulation with a low-frequency sinusoidal pulse width modulation (SPWM). Therefore, the switching losses decrease considerably with respect to the conventional simple boost modulation. In addition, the impedance network design frequency remains high, and the network size decreases obviously. The proposed approach removes the interdependence between the shoot-through duty cycle and the inverter modulation index. A comparison between the proposed method and the conventional simple boost method is performed to show its advantages over the conventional method. Finally, experimental results are presented to validate the performance of the proposed method.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 65, Issue: 6, June 2018)
Page(s): 5167 - 5176
Date of Publication: 18 December 2017

ISSN Information:


I. Introduction

Future demand considerations lead different countries to use renewable energies as an excellent alternative for fossil fuels. With the growth of utilization of the renewable energies, power electronics converters have been more applicable in this field [1]– [4]. Depending on the application, the power converter requires specific features such as voltage gain, size, efficiency, cost, etc.

References

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