Comparative analysis of switched inductor‑based quasi‑Z‑source inverters

Raheel Afzal; Yu Tang; Yinghao Song

Comparative analysis of switched inductor‑based quasi‑Z‑source inverters

Raheel Afzal

Yu Tang

Yinghao Song

Vol. 22, No. 10, pp. 1652-1664, Oct. 2022

10.1007/s43236-022-00482-2

Z-source inverter

High set-up

Voltage lift

Abstract

A switched-inductor quasi-Z-source inverter (SI-qZSI) exhibits a higher gain than a quasi-Z-source inverter (qZSI) while keeping continuous input current. Like renewable power generation systems that result in low input voltage, SI-qZSI exhibits boosting ability that may not be adequate in some cases. A voltage-lifting unit can be formed by alternating one of the diodes in the switch inductor unit. A high step-up topology, such as qZSI with voltage-lifting unit (qZSI-VL), can be derived. The boosting factor of qZSI-VL can be enhanced further by retaining all the merits of the SI-qZSI. The overall conduction loss can be reduced under the same output and input voltage for the qZSI-VL, thereby enhancing efficiency. In this study, the analysis of the qZSI-VL and its operating principle are explained. The characteristic comparison of qZSI-VL with the SI-qZSI and qZSI is discussed in detail. Finally, the prototypes of qZSI-VL and SI-qZSI are designed in the lab. Simulation and experiments are performed to verify the analysis.

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Cite this article

[IEEE Style]

R. Afzal, Y. Tang, Y. Song, "Comparative analysis of switched inductor‑based quasi‑Z‑source inverters," Journal of Power Electronics, vol. 22, no. 10, pp. 1652-1664, 2022. DOI: 10.1007/s43236-022-00482-2.

[ACM Style]

Raheel Afzal, Yu Tang, and Yinghao Song. 2022. Comparative analysis of switched inductor‑based quasi‑Z‑source inverters. Journal of Power Electronics, 22, 10, (2022), 1652-1664. DOI: 10.1007/s43236-022-00482-2.