Modified Impedance-Source Inverter with Continuous Input Currents and Fault-Tolerant Operations

Jing Yuan, Yongheng Yang, Ping Liu, Yanfeng Shen and Frede Blaabjerg
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Jing Yuan: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
Yongheng Yang: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
Ping Liu: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
Yanfeng Shen: Department of Engineering-Electrical Engineering Division, University of Cambridge, Cambridge CB3 0FA, UK
Frede Blaabjerg: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark

Energies, 2020, vol. 13, issue 13, 1-16

Abstract: Impedance-source (Z-source) inverters are increasingly adopted in practice, where a high voltage gain is required. However, issues like drawing a non-continuous current from the DC source and ceasing the energy supply under DC source faults are also observed. In this paper, an embedded enhanced-boost Z-source inverter (EEB-ZSI) is thus proposed to tackle the issues. The proposed EEB-ZSI employs two DC sources, which enable the continuous input current and fault-tolerant operations (e.g., open-circuit and short-circuit faults in the DC sources). The operational principles are presented in detail with an in-depth circuit analysis. Moreover, the proposed EEB-ZSI is benchmarked with prior-art Z-source inverters. Experimental tests further demonstrate the effectiveness of EEB-ZSI regarding the continuous input current and flexible fault tolerance.

Keywords: impedance source converter; Z-source inverter; switched-inductor; fault-tolerant; continuous input current (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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