A Novel Dual-Mode Switched-Capacitor Five-Level Inverter With Common-Ground Transformerless Concept

Transformerless (TL) grid-connected photovoltaic (PV) inverters with a common-ground (CG) circuit architecture exhibit some excellent features in removing the leakage current concern and improving the overall efficiency. However, the ability to cope with a wide range of input voltage changes while m...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2021-12, Vol.36 (12), p.13740-13753
Main Authors: Barzegarkhoo, Reza, Siwakoti, Yam P., Aguilera, Ricardo P., Khan, Md. Noman Habib, Lee, Sze Sing, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Capacitors
Circuit design
Circuits
Common grounded transformerless inverters
Comparative studies
Electric potential
Electrical grounding
Energy conversion
grid-connected applications
Inverters
Leakage current
Leakage currents
model predictive control
Photovoltaic cells
Reactive power
switched-capacitor cells
Switches
Switching
Topology
Voltage
Voltage control
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Summary:Transformerless (TL) grid-connected photovoltaic (PV) inverters with a common-ground (CG) circuit architecture exhibit some excellent features in removing the leakage current concern and improving the overall efficiency. However, the ability to cope with a wide range of input voltage changes while maintaining the output voltage in a single power conversion stage is a key technological challenge. Considering this, the article at hand proposes a novel dual-mode switched-capacitor five-level (DMSC5L)-TL inverter with a CG feature connected to the grid. The proposed topology is comprised of a single dc source and power diode, three capacitors, four unidirectional, and three bidirectional power switches. Based on the series-parallel switching conversion of the involved switches, the proposed DMSC5L-TL inverter can generate five distinctive output voltage levels during both the boost and buck operation modes with a self-voltage balancing operation for the involved capacitors. A simple dead-beat continuous current controller (DB3C) modulation technique is also used to handle both the active and reactive power exchange while ensuring a fixed switching frequency operation. The proposed circuit description with its DB3C details, the design guidelines with a comparative study, and some experimental results are also given to show the feasibility of the proposed solution for the practical applications.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3074517