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Deviations between the commonly-used model and measurements of harmonic distortion in low-voltage installations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. (Electric Power Engineering)ORCID iD: 0000-0003-4079-4776
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. (Electrical Power Systems)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. (Electric Power Engineering)
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. (Electric Power Engineering)
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2020 (English)In: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Electric Power Systems Research, ISSN 0378-7796, Vol. 180, no 1, p. 1-6, article id 106166Article in journal, Editorial material (Other (popular science, discussion, etc.)) Accepted
Abstract [en]

Harmonic analysis studies of modern power systems commonly employ Norton and Thévenin equivalents at harmonic frequencies for the nonlinear devices. This approach neglects the so-called nonlinear interaction phenomenon. This paper addresses the difference between the results from the commonly-used model and the actual harmonic distortion measured in a low-voltage installation. A number of indices are introduced to quantify the nonlinear interaction. These indices allow a quantification of the extent to which the commonly-used model is also to predict harmonic voltages and currents in a modern low-voltage installation. The proposed model and the subsequent mathematical analysis are illustrated through measurements from different combinations of PV inverters and LED lamps using different technologies. The results show that deviation is dependent on the used technology, network impedance, and source voltage waveform. Other findings are that nonlinear interaction happens mainly in the low harmonic orders and impacts are more perceived on the harmonics phase angle. Possible explanations for these observations are discussed.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2020. Vol. 180, no 1, p. 1-6, article id 106166
Keywords [en]
Power quality, Power system harmonics, Power electronics, Harmonic analysis, Nonlinear systems
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-77661DOI: 10.1016/j.epsr.2019.106166OAI: oai:DiVA.org:ltu-77661DiVA, id: diva2:1392141
Funder
Swedish Energy AgencyAvailable from: 2020-02-06 Created: 2020-02-06 Last updated: 2020-02-06

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Publisher's full texthttps://doi.org/10.1016/j.epsr.2019.106166

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