New Modulation for Z-Source Inverters With Optimized Arrangement of Shoot-Through State for Inductor Volume Reduction | IEEE Journals & Magazine | IEEE Xplore

New Modulation for Z-Source Inverters With Optimized Arrangement of Shoot-Through State for Inductor Volume Reduction


Abstract:

In this article, a new modulation method based on space-vector modulation for Z-source inverters is proposed. One modulation method named ZSVM6 is attractive for the use ...Show More

Abstract:

In this article, a new modulation method based on space-vector modulation for Z-source inverters is proposed. One modulation method named ZSVM6 is attractive for the use of SiC-mosfets since it can avoid the body-diode conduction. The proposed modulation is based on ZSVM6 and can reduce the current ripple in the inductor in its impedance source by introducing additional shoot-through intervals to divide the longest active state. The proposed modulation can reduce the current ripple by 44.5% in comparison with that by the conventional ZSVM6 under the same switching frequency. Conversely, the inductance required to achieve the same current ripple can be reduced by the same ratio. The reduction of the inductor volume through the proposed modulation was confirmed experimentally using a prototype of quasi-Z-source inverter and fabricated inductors. The experimental results also confirmed that the inductor size reduction can be achieved without increase in the total power loss of the converter. A harmonics analysis based on the experiments showed that the harmonic components in the current can be increased through the proposed modulation. However, the frequency range of the increased components can be much higher than the control frequency; therefore, its influence on the design of passive components is not severe.
Published in: IEEE Transactions on Power Electronics ( Volume: 37, Issue: 3, March 2022)
Page(s): 2573 - 2582
Date of Publication: 02 September 2021

ISSN Information:


I. Introduction

With the rapid development of electric vehicles and photovoltaic power generation during the past decade, many studies on these applications have focused on the power conversions, which are considered to affect the entire performance of the system and therefore can make them more attractive. The conventional power converters for such applications usually consist of a boost converter for extending their acceptable input voltage range, and a three-phase voltage source inverter (VSI), which converts dc into ac. The use of high-performance power semiconductor devices is the most effective approach to achieve a higher efficiency and a high power density of the power converters.

References

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