Optimization Strategy of Low Harmonic Content Trapezoidal Modulation for Quasi-Z-Source Inverter

doi:10.3969/j.issn.1008-0198.2024.03.014

Abstract

Abstract: :A trapezoidal waveform-based optimization strategy is proposed in this paper to address the problems of harmonic pollution and high voltage stress on power devices in quasi-Z-source inverter. The modulation strategy improves the electrical energy quality by selecting the appropriate ladder shaping rate while ensuring the voltage utilization of the DC-link voltage and significantly reducing the total harmonic wave deformation of the quasi-Z-source inverter output current. In addition, the selection of a trapezoidal waveform as the modulating waveform can effectively reduce the voltage stress on the capacitors and power devices in the quasi-Z-source network. The proposed modulation strategy is simulated and analyzed using MATLAB/Simulink software to ensure its correctness and effectiveness. Finally, the trapezoidal waveform-based modulation strategy is further validated by the RT-LAB experimental platform.

Key words: quasi-Z-source inverter, pulse width modulation, total harmonic distortion rate, voltage stress

CLC Number:

TM464

YI Wenjing, ZHANG Yang, YANG Yuxin, LUO Zhaoxu, CHENG Zhun. Optimization Strategy of Low Harmonic Content Trapezoidal Modulation for Quasi-Z-Source Inverter[J]. Hunan Electric Power, 2024, 44(3): 96-104.

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