Journal article

Single-Phase Transformer-based HF-Isolated Impedance Source Inverters With Voltage Clamping Techniques

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Publication Details

Author list: Aleem Z , Winberg S, Iqbal A, Al-Hitmi MAE, Hanif M

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Publication year: 2019

Journal: IEEE Transactions on Industrial Electronics

Volume number: 66

Issue number: 11

Start page: 8434

End page: 8444

Total number of pages: 11

ISSN: 0278-0046


In this paper, a new family of impedance source inverters is presented. It employs high-frequency electrical isolation between the inverter bridge switches and the load along with voltage clamping across the dc-link voltage.Conventional Z-source inverters (ZSIs) employs an impedance network that consists of inductors and capacitors. It has unique features that realize both step-up/step-down functions and eliminates the need of dead/overlap times. This paper extends this novel concept by using electrical isolation in impedance source inverters. High-frequency isolation has many advantages interms of immunity and reliability; when applied with impedance source inverters this makes ZSIs a preferable choice for industrial applications. Inphoto-voltaic systems, the addition of the high-frequency transformer provides safety by avoiding the injection of dc circulating current into the grid, without the need of an external bulky line frequency transformer. The gain of the proposed inverter design can be accurately selected by choosing the turns ratio of the high frequency transformer (HFT) or by adjusting the shoot-through duty cycle (STDC) to the inverter. This allows for greater freedom especially when utilizing a higher modulation index, with the STDC allowing dynamic gain adjusts to be done speedily during operation of the inverter. Additionally, a dc-rail voltage clamping technique for the proposed class of isolated ZS Is is also discussed.This technique provides benefits not only in improving the output voltage quality, but also in reducing voltage stress of the active and passive components by minimizing the voltage spikes across the switching


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Last updated on 2020-11-06 at 15:22