NDLI: Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination

Content Provider	IEEE Xplore Digital Library
Author	Yi Tang Wenli Yao Poh Chiang Loh Blaabjerg, F.
Copyright Year	1982
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.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	1016
Ending Page	1026
Page Count	11
File Size	1746619
File Format	PDF
ISSN	02780046
Volume Number	63
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Inverters Leakage currents Capacitors Impedance Inductors Voltage control Reliability transformerless photovoltaic inverter Leakage current power decoupling single-phase system transformerless photovoltaic (PV) inverter
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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