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http://dx.doi.org/10.1007/s43236-022-00482-2

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

Afzal, Raheel (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology)
Tang, Yu (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology)
Song, Yinghao (State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology)
Publication Information
Journal of Power Electronics / v.22, no.10, 2022 , pp. 1652-1664 More about this Journal
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 efciency. 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.
Keywords
Z-source inverter; High set-up; Voltage lift;
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