NDLI: Eliminating ground current in a transformerless photovoltaic application

Content Provider	IEEE Xplore Digital Library
Author	Lopez, O. Teodorescu, R. Freijedo, F. Doval-Gandoy, J.
Copyright Year	2007
Description	Author affiliation: Electron. Technol. Dept., Vigo Univ., Vigo (Lopez, O.)
Abstract	A single phase converter can be used for low-power grid connected applications. In photovoltaic applications it is possible to remove the transformer in the inverter in order to reduce losses, costs and size. Galvanic connection of the grid and the DC sources in transformerless systems can introduce additional leakage currents because of the earth parasitic capacitance. This currents increase conducted and radiated electromagnetic emissions, harmonics injected in the utility grid and system losses. Amplitude and spectrum of ground current depends on the converter topology, on the switching strategy and on the resonant circuit formed by the ground capacitance, the converter, the AC filter and the grid. In this paper, the leakage current in a 1.5 kW photovoltaic installation is measured. The installation includes a string of sixteen panels, a full bridge inverter and a LCL filter. Influence of inverter topology and modulation strategy on the magnitude of the leakage current is presented. Finally, the use of neutral point clamped inverters in transformerless photovoltaic applications is studied.
Starting Page	1
Ending Page	5
File Size	355208
Page Count	5
File Format	PDF
ISBN	142441296X
ISSN	19325517
DOI	10.1109/PES.2007.385789
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photovoltaic systems Solar power generation Inverters Leakage current Parasitic capacitance Switching converters Circuit topology Filters Costs Galvanizing
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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