Generalized discontinuous PWM strategy for Z‑source inverters with switch losses optimization

Yizhan Jiang; Qiang Wang; Fengyou He; Jingwei Zhang; Zhikang Guo

Generalized discontinuous PWM strategy for Z‑source inverters with switch losses optimization

Vol. 25, No. 1, pp. 1-13, Jan. 2025

10.1007/s43236-024-00883-5

Z-source inverter

Discontinuous modulation

Switching losses optimization

Space vector modulation

Abstract

The shoot-through state of the Z-source inverter generates large switching losses. However, the discontinuous modulation strategy can effectively reduce the switching losses of power devices. When the discontinuous modulation strategy is used in Z-source inverters, the switching sequences and the shoot-through states need to be arranged reasonably. This paper provides a method for comparing the switching losses of different modulation strategies by calculating the current that is passed through a switching device for a fundamental cycle. The calculations show that the Z-source inverter switching losses are determined by the number of switching actions in a switching period and by the method of insertion of the shoot-through state. Based on this, a generalized discontinuous modulation strategy for Z-source inverters is proposed. This modulation strategy achieves optimal switching losses when the power factor is less than 1. The method of redistributing the shootthrough states can be applied to other modulation strategies to achieve loss optimization. The effectiveness of the proposed modulation method is demonstrated by MATLAB/Simulink combined with PLECS simulation. Finally, and a low-power platform is built for experimental verification.

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Cite this article

[IEEE Style]

Y. Jiang, Q. Wang, F. He, J. Zhang, Z. Guo, "Generalized discontinuous PWM strategy for Z‑source inverters with switch losses optimization," Journal of Power Electronics, vol. 25, no. 1, pp. 1-13, 2025. DOI: 10.1007/s43236-024-00883-5.

[ACM Style]

Yizhan Jiang, Qiang Wang, Fengyou He, Jingwei Zhang, and Zhikang Guo. 2025. Generalized discontinuous PWM strategy for Z‑source inverters with switch losses optimization. Journal of Power Electronics, 25, 1, (2025), 1-13. DOI: 10.1007/s43236-024-00883-5.