Zero Leakage Current Single-Phase Quasi-Single-Stage Transformerless PV Inverter With Unipolar SPWM

Power inverters for distributed photovoltaic (PV) power generation systems usually need to fulfill several requirements, e.g., the safety, the voltage boost capability, and the reduced volume and the cost. An improved transformerless single-phase quasi-single-stage common-mode PV inverter with four...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2022-11, Vol.37 (11), p.13755-13766
Main Authors: Peng, Fan, Zhou, Guohua, Xu, Nengmou, Gao, Siya
Format: Article
Language:English
Subjects:
Boosting
Capacitors
Design parameters
Distributed generation
Electric potential
Inverters
Leakage current
Leakage currents
Modulation
Photovoltaic cells
Quasi-single-stage photovoltaic (PV) inverter
Safety
Switches
transformerless common-mode (CM) inverter
Transformers
unipolar modulation strategy
Voltage
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Summary:Power inverters for distributed photovoltaic (PV) power generation systems usually need to fulfill several requirements, e.g., the safety, the voltage boost capability, and the reduced volume and the cost. An improved transformerless single-phase quasi-single-stage common-mode PV inverter with four switches and an improved unipolar modulation strategy are proposed in this article. The inverter features double-grounded to solve potential safety issues caused by the leakage current. In addition, its voltage boosting is accomplished by a quasi- single-stage conversion structure so that PV system efficiency can be improved. Meanwhile, it benefits continuous input current so is suitable for PV application. In this article, the operation principle of the proposed inverter, the improved modulation strategy, and two grid-tied control strategies are introduced. The voltage and current stresses of the components are analyzed, and parameter design guideline is further given. Both the off-grid and grid-tied experiments were conducted to verify the theoretical analysis.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2022.3180287