Deviations between the commonly-used model and measurements of harmonic distortion in low-voltage installations

Document identifier: oai:DiVA.org:ltu-77661
Access full text here:10.1016/j.epsr.2019.106166
Keyword: Engineering and Technology, Electrical Engineering, Electronic Engineering, Information Engineering, Other Electrical Engineering, Electronic Engineering, Information Engineering, Teknik och teknologier, Elektroteknik och elektronik, Annan elektroteknik och elektronik, Power quality, Power system harmonics, Power electronics, Harmonic analysis, Nonlinear systems, Electric Power Engineering, Elkraftteknik
Publication year: 2020
Abstract:

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.

Authors

Tatiano Busatto

Luleå tekniska universitet; Energivetenskap
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Vineetha Ravindran

Luleå tekniska universitet; Energivetenskap
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Anders Larsson

Luleå tekniska universitet; Energivetenskap
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Sarah Rönnberg

Luleå tekniska universitet; Energivetenskap
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Math Bollen

Luleå tekniska universitet; Energivetenskap
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Jan Meyer

Electric Power Engineering, Technische Universität Dresden
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