Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/651888
Title: Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination
Authors: Yi Tang;Wenli Yao;Poh Chiang Loh;Frede Blaabjerg
subject: power decoupling|Leakage current|single-phase system|transformerless photovoltaic inverter
Year: 2016
Publisher: IEEE
Abstract: This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in grid-connected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common-mode (CM) conducting path to the inverter. The resulting ground leakage current is therefore well controlled to be below the regulation limit. Furthermore, the proposed inverter can also eliminate the well-known double-line-frequency pulsating power that is inherent in single-phase PV systems. By properly injecting CM voltages to the output filter capacitors, the pulsating power can be decoupled from the dc-link. Therefore, it is possible to use long-lifetime film capacitors instead of electrolytic capacitors to improve the reliability of the PV system. The mechanism of leakage current suppression and the closed-loop control of pulsating power decoupling are discussed in this paper in detail. A 500-W prototype was also built and tested in the laboratory, and both simulation and experimental results are finally presented to show the excellent performance of the proposed PV inverter.
URI: http://localhost/handle/Hannan/138791
http://localhost/handle/Hannan/651888
ISSN: 0278-0046
1557-9948
volume: 63
issue: 2
Appears in Collections:2016

Files in This Item:
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7254185.pdf1.56 MBAdobe PDFThumbnail
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Title: Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination
Authors: Yi Tang;Wenli Yao;Poh Chiang Loh;Frede Blaabjerg
subject: power decoupling|Leakage current|single-phase system|transformerless photovoltaic inverter
Year: 2016
Publisher: IEEE
Abstract: This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in grid-connected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common-mode (CM) conducting path to the inverter. The resulting ground leakage current is therefore well controlled to be below the regulation limit. Furthermore, the proposed inverter can also eliminate the well-known double-line-frequency pulsating power that is inherent in single-phase PV systems. By properly injecting CM voltages to the output filter capacitors, the pulsating power can be decoupled from the dc-link. Therefore, it is possible to use long-lifetime film capacitors instead of electrolytic capacitors to improve the reliability of the PV system. The mechanism of leakage current suppression and the closed-loop control of pulsating power decoupling are discussed in this paper in detail. A 500-W prototype was also built and tested in the laboratory, and both simulation and experimental results are finally presented to show the excellent performance of the proposed PV inverter.
URI: http://localhost/handle/Hannan/138791
http://localhost/handle/Hannan/651888
ISSN: 0278-0046
1557-9948
volume: 63
issue: 2
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7254185.pdf1.56 MBAdobe PDFThumbnail
Preview File
Title: Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination
Authors: Yi Tang;Wenli Yao;Poh Chiang Loh;Frede Blaabjerg
subject: power decoupling|Leakage current|single-phase system|transformerless photovoltaic inverter
Year: 2016
Publisher: IEEE
Abstract: This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in grid-connected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common-mode (CM) conducting path to the inverter. The resulting ground leakage current is therefore well controlled to be below the regulation limit. Furthermore, the proposed inverter can also eliminate the well-known double-line-frequency pulsating power that is inherent in single-phase PV systems. By properly injecting CM voltages to the output filter capacitors, the pulsating power can be decoupled from the dc-link. Therefore, it is possible to use long-lifetime film capacitors instead of electrolytic capacitors to improve the reliability of the PV system. The mechanism of leakage current suppression and the closed-loop control of pulsating power decoupling are discussed in this paper in detail. A 500-W prototype was also built and tested in the laboratory, and both simulation and experimental results are finally presented to show the excellent performance of the proposed PV inverter.
URI: http://localhost/handle/Hannan/138791
http://localhost/handle/Hannan/651888
ISSN: 0278-0046
1557-9948
volume: 63
issue: 2
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7254185.pdf1.56 MBAdobe PDFThumbnail
Preview File