Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency

Presence of a transformer in a grid connected photovoltaic system provides galvanic isolation between the photovoltaic panels and the grid. However, it increases the overall cost, makes the circuit bulky and reduces the efficiency of the system. Hence, transformerless inverters have gained significa...

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Main Authors: Aditi Atul Desai, Suresh Mikkili, Tomonobu Senjyu
Format: Article
Language:English
Published: MDPI AG 2022-05-01
Series:Energies
Subjects:
Online Access:https://www.mdpi.com/1996-1073/15/10/3789
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author Aditi Atul Desai
Suresh Mikkili
Tomonobu Senjyu
author_facet Aditi Atul Desai
Suresh Mikkili
Tomonobu Senjyu
author_sort Aditi Atul Desai
collection DOAJ
description Presence of a transformer in a grid connected photovoltaic system provides galvanic isolation between the photovoltaic panels and the grid. However, it increases the overall cost, makes the circuit bulky and reduces the efficiency of the system. Hence, transformerless inverters have gained significant importance owing to its low cost, light weight and increased efficiency. However, due to the absence of the transformer, there is no galvanic isolation between photovoltaic panels and the grid and there is always a threat of flow of leakage current. In this research paper, an elaborate analysis of H4, H5 and H6 transformerless inverter is carried out. DC side decoupled circuits are studied to eliminate the leakage current. Their performances are compared based on the simulations carried out in MATLAB/SIMULINK software. A novel H6 inverter is proposed by introducing an additional switch in H5 topology. A direct current path is provided in H5 topology during one of the active modes, so that current flows through few switches thereby reducing the conduction losses. Common mode voltage remains constant in the proposed H6 inverter and hence the leakage current is eliminated. The proposed H6 inverter can thus be a promising topology to eliminate leakage current and reduce conduction loss in the transformerless grid connected photovoltaic system.
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spelling doaj.art-0cae0bed0b4643b9af7b86b916a58f0f2023-11-23T10:53:09ZengMDPI AGEnergies1996-10732022-05-011510378910.3390/en15103789Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance EfficiencyAditi Atul Desai0Suresh Mikkili1Tomonobu Senjyu2Electrical and Electronics Engineering Department, National Institute of Technology, Ponda 403401, IndiaElectrical and Electronics Engineering Department, National Institute of Technology, Ponda 403401, IndiaDepartment of Electrical and Electronics Engineering, University of Ryukyus, Okinawa 903-0213, JapanPresence of a transformer in a grid connected photovoltaic system provides galvanic isolation between the photovoltaic panels and the grid. However, it increases the overall cost, makes the circuit bulky and reduces the efficiency of the system. Hence, transformerless inverters have gained significant importance owing to its low cost, light weight and increased efficiency. However, due to the absence of the transformer, there is no galvanic isolation between photovoltaic panels and the grid and there is always a threat of flow of leakage current. In this research paper, an elaborate analysis of H4, H5 and H6 transformerless inverter is carried out. DC side decoupled circuits are studied to eliminate the leakage current. Their performances are compared based on the simulations carried out in MATLAB/SIMULINK software. A novel H6 inverter is proposed by introducing an additional switch in H5 topology. A direct current path is provided in H5 topology during one of the active modes, so that current flows through few switches thereby reducing the conduction losses. Common mode voltage remains constant in the proposed H6 inverter and hence the leakage current is eliminated. The proposed H6 inverter can thus be a promising topology to eliminate leakage current and reduce conduction loss in the transformerless grid connected photovoltaic system.https://www.mdpi.com/1996-1073/15/10/3789transformerless inverterleakage currentcommon mode voltageparasitic capacitance
spellingShingle Aditi Atul Desai
Suresh Mikkili
Tomonobu Senjyu
Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency
Energies
transformerless inverter
leakage current
common mode voltage
parasitic capacitance
title Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency
title_full Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency
title_fullStr Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency
title_full_unstemmed Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency
title_short Novel H6 Transformerless Inverter for Grid Connected Photovoltaic System to Reduce the Conduction Loss and Enhance Efficiency
title_sort novel h6 transformerless inverter for grid connected photovoltaic system to reduce the conduction loss and enhance efficiency
topic transformerless inverter
leakage current
common mode voltage
parasitic capacitance
url https://www.mdpi.com/1996-1073/15/10/3789
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AT sureshmikkili novelh6transformerlessinverterforgridconnectedphotovoltaicsystemtoreducetheconductionlossandenhanceefficiency
AT tomonobusenjyu novelh6transformerlessinverterforgridconnectedphotovoltaicsystemtoreducetheconductionlossandenhanceefficiency