Switched-Coupled-Inductor Quasi-Z-Source Inverter

Z-source inverters have become a research hotspot because of their single-stage buck-boost inversion ability, and better immunity to EMI noises. However, their boost gains are limited, because of higher component-voltage stresses and poor output power quality, which results from the tradeoff between...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2016-02, Vol.31 (2), p.1241-1254
Main Authors: Ahmed, Hafiz Furqan, Honnyong Cha, Su-Han Kim, Heung-Geun Kim
Format: Article
Language:English
Subjects:
Boost ability
Capacitors
Diodes
Electric currents
Electric noise
Electric potential
Inductors
Inversions
Inverters
Modulation
Ripples
Stress
Stresses
switch-voltage stress
switched-coupled-inductor quasi-Z-source inverter (SCL-qZSI)
Switching
Virtual private networks
Voltage
Windings
Z-source inverter
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Summary:Z-source inverters have become a research hotspot because of their single-stage buck-boost inversion ability, and better immunity to EMI noises. However, their boost gains are limited, because of higher component-voltage stresses and poor output power quality, which results from the tradeoff between the shoot-through interval and the modulation index. To overcome these drawbacks, a new high-voltage boost impedance-source inverter called a switched-coupled-inductor quasi-Z-source inverter (SCL-qZSI) is proposed, which integrates a switched-capacitor and a three-winding switched-coupled inductor (SCL) into a conventional qZSI. The proposed SCL-qZSI adds only one capacitor and two diodes to a classical qZSI, and even with a turns ratio of 1, it has a stronger voltage boost-inversion ability than existing high-voltage boost (q)ZSI topologies. Therefore, compared with other (q)ZSIs for the same input and output voltages, the proposed SCL-qZSI utilizes higher modulation index with lower component-voltage stresses, has better spectral performance, and has a lower input inductor current ripple and flux density swing or, alternately, it can reduce the number of turns or size of the input inductor. The size of the coupled inductor and the total number of turns required for three windings are comparable to those of a single inductor in (q)ZSIs. To validate its advantages, analytical, simulation, and experimental results are also presented.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2015.2414971