A New Transformer-Less Five-Level Grid-Tied Inverter for Photovoltaic Applications

A new fundamental structure of a single-phase transformer-less grid connected multilevel inverter based on a switched-capacitor structure is presented in this study. By employing the series-parallel switching conversion of the integrated switched-capacitor module in a packed unit, attractive feature...

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Published in	IEEE transactions on energy conversion Vol. 35; no. 1; pp. 106 - 118
Main Authors	Vosoughi, Naser, Hosseini, Seyed Hossein, Sabahi, Mehran
Format	Journal Article
Language	English
Published	New York IEEE 01.03.2020 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects	Active control Capacitors Energy sources Grid connected multilevel inverter Inductors Inverters Leakage current leakage current elimination Leakage currents Multilevel Phase transformers Phase transitions switched-capacitor based structure Switches Topology transformer-less inverter Transformers Waveforms
Online Access	Get full text
ISSN	0885-8969 1558-0059
DOI	10.1109/TEC.2019.2940539

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Abstract	A new fundamental structure of a single-phase transformer-less grid connected multilevel inverter based on a switched-capacitor structure is presented in this study. By employing the series-parallel switching conversion of the integrated switched-capacitor module in a packed unit, attractive features for the proposed inverter can be obtained such as high efficiency and boosting ability within a single stage operation. Also, using a common grounding technique provides an additional advantage of reducing the leakage current. Moreover, the presented structure generates a multilevel waveform at the output voltage terminals which reduces the harmonics in the system. A peak current controller is utilized for triggering the gate of the power switches and controlling both the active and reactive powers. This results in a tightly controlled current with an appropriate quality that can be injected to the grid using a single source renewable energy resource. Operating procedures, design considerations, comparison studies and test results of a 620 W prototype are also presented to validate the accuracy and feasibility of the proposed multilevel inverter.
AbstractList	A new fundamental structure of a single-phase transformer-less grid connected multilevel inverter based on a switched-capacitor structure is presented in this study. By employing the series-parallel switching conversion of the integrated switched-capacitor module in a packed unit, attractive features for the proposed inverter can be obtained such as high efficiency and boosting ability within a single stage operation. Also, using a common grounding technique provides an additional advantage of reducing the leakage current. Moreover, the presented structure generates a multilevel waveform at the output voltage terminals which reduces the harmonics in the system. A peak current controller is utilized for triggering the gate of the power switches and controlling both the active and reactive powers. This results in a tightly controlled current with an appropriate quality that can be injected to the grid using a single source renewable energy resource. Operating procedures, design considerations, comparison studies and test results of a 620 W prototype are also presented to validate the accuracy and feasibility of the proposed multilevel inverter.
Author	Vosoughi, Naser Hosseini, Seyed Hossein Sabahi, Mehran
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SubjectTerms	Active control Capacitors Energy sources Grid connected multilevel inverter Inductors Inverters Leakage current leakage current elimination Leakage currents Multilevel Phase transformers Phase transitions switched-capacitor based structure Switches Topology transformer-less inverter Transformers Waveforms
Title	A New Transformer-Less Five-Level Grid-Tied Inverter for Photovoltaic Applications
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