Discontinuous Modulation for a Quasi-Z-Source Inverter With Low Switching Times and High Voltage Gain

doi:10.3969/j.issn.1008- 0198.2023.05.010

Abstract

Abstract: The quasi-Z-source inverter is widely used to replace traditional two-stage structures due to its advantages of continuous input current and simple structure. Aiming at the problems of complex gate signals generation, excessive switching times of inverter switches, high switching losses, and insufficient voltage gain in the existing modulation strategies, a discontinuous modulation for quasi-Z-source inverter with low switching times and high voltage gain is proposed, which uses fewer reference signals to generate gate signals. At the same time, the switching signals of this discontinuous modulation strategy are clamped to positive or negative pole, which significantly reduces the switching times of the inverter, thereby reducing the switching losses of the switches. In addition, the shoot-through duration and the insertion position are reasonably planned to achieve the greatest voltage gain. The correctness and effectiveness of the modulation strategy are verified by MATLAB/PLECS simulation analysis and RT-LAB experimental results.

Key words: quasi-Z-source inverter, pulse width modulation, high voltage gain, switching times

CLC Number:

TM46

YI Wenjing, CAO Kun, MENG Yuwei, LUO Zhaoxu, CHENG Zhun. Discontinuous Modulation for a Quasi-Z-Source Inverter With Low Switching Times and High Voltage Gain[J]. Hunan Electric Power, 2023, 43(5): 61-70.

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