A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter With Less Leakage Current

This paper presents a novel structure of the transformer-less grid-connected inverters. The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output. Furthermore, the proposed inverter can overcome the leakage current issue in the...

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Bibliographic Details
Published in:IEEE access 2022, Vol.10, p.63736-63753
Main Authors: Kurdkandi, Naser Vosoughi, Marangalu, Milad Ghavipanjeh, Mohammadsalehian, Shamim, Tarzamni, Hadi, Siwakoti, Yam P., Islam, Md. Rabiul, Muttaqi, Kashem M.
Format: Article
Language:English
Subjects:
Capacitors
Converters
Electric potential
Harmonic distortion
Inverters
Leakage current
leakage current limitation
Leakage currents
photovoltaic application
Photovoltaic cells
Reactive power
Switches
Topology
Transformer-less inverter
Transformers
Voltage
voltage boosting ability
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Summary:This paper presents a novel structure of the transformer-less grid-connected inverters. The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output. Furthermore, the proposed inverter can overcome the leakage current issue in the photovoltaic (PV) system, which is the major problem in grid-tied PV applications. Additional significant features include- reduced filter size, lower total harmonic distortion (THD) of the injected current to the grid, and voltage boosting ability. Moreover, the proposed topology provides full reactive power support to the grid. A control strategy is designed and implemented to provide a voltage boost ability without using any additional dc-dc boost converter. Finally, the performance of the proposed inverter is validated by the 770 W laboratory prototype.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2022.3182240