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Characteristics of voltage fluctuations induced by household devices and the impact on LED lamps
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-1301-9283
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-4004-0352
Universidad de Córdoba, Edificio Leonardo Da Vinci, Campus de Rabanales, Ctra. N-IVa Km. 396, Córdoba 14071, Spain.
2022 (English)In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 141, article id 108158Article in journal (Refereed) Published
Abstract [en]

The aim of the paper is to describe the characteristics of voltage fluctuations induced by household devices in low voltage (LV) networks as well as the impact produced in the LED lamps’ flicker. A number of devices commonly found in households or offices have been studied and the results are described in terms of magnitude of resulting voltage fluctuation, rate of change and frequency of occurrence. The state of operation of the various devices have been linked to the resulting voltage fluctuations and a number of types or patterns of fluctuations with distinct characteristics have been defined. Measurements have been performed in a controlled environment using a source impedance representing a weak grid. Additional measurements were performed in a residential area where the source impedance is considered low. The flicker impact of the voltage fluctuations from the devices connected to the weak grid has been evaluated using the light flickermeter. The results show that there is a link between operation mode of the device and pattern of resulting voltage fluctuation, however it is not the case for all the operation modes in all devices. Several of the devices included in the study caused voltage fluctuations that produced flicker in LED lamps where the rate of change of the fluctuation is seen to have a significant impact.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 141, article id 108158
Keywords [en]
Flicker, Household devices, LED lamps, Voltage fluctuations
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-90070DOI: 10.1016/j.ijepes.2022.108158ISI: 000792890200006Scopus ID: 2-s2.0-85127212840OAI: oai:DiVA.org:ltu-90070DiVA, id: diva2:1649553
Funder
Swedish Energy Agency
Note

Validerad;2022;Nivå 2;2022-04-04 (hanlid)

Available from: 2022-04-04 Created: 2022-04-04 Last updated: 2023-09-05Bibliographically approved
In thesis
1. On voltage fluctuations in low voltage grids – characterization, propagation and impact on LED lamps
Open this publication in new window or tab >>On voltage fluctuations in low voltage grids – characterization, propagation and impact on LED lamps
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work presented focuses on voltage fluctuations produced by household devices and their impact on the light output of LED lamps. Voltage fluctuations can produce unsteadiness on the light intensity of the lamps, so-called light flicker. An observer may or may not experience light flicker, depending on e.g., the severity of the voltage fluctuation, the lighting technology affected and the characteristics of the observer itself. The presence of voltage fluctuations in the grid is limited in the standards. One of the reasons for this limit is the impact the voltage fluctuations have on an incandescent lamp and by the irritability experienced by an average observer experiencing the resulting light flicker. New lighting technologies have been developed replacing the incandescent lamp e.g., halogen lamps, fluorescent lamps or most recently LED lamps. LED lamps are already in the market and are expected to dominate it in the future years.

The impact that voltage fluctuations produce on LED lamps is studied in this thesis. To address this study, the factors other than voltage fluctuations that could affect the light output of LED lamps are studied, e.g., stabilization of the LED lamp, topology, impact of aging on the LED lamp or ambient disturbances.

The study is focused on the voltage fluctuations produced by household devices. Measurements of household devices are performed to characterize the voltage fluctuations that they produce by e.g., their magnitude, rate of change, frequency or perception level by an average observer of light flicker on LED lamps.

Different LED lamps have different responses on the light output subjected to a similar voltage fluctuation. This is a difficulty when considering LED lamps as a reference to measure their ritability experienced by an observer due to voltage fluctuations. The study offers a solution based on the characterization of the response of a generalized LED lamp.

Uncertainties, such as the use of household devices or the occurrence of voltage fluctuations, are addressed using a stochastic approach, introducing the concept of risk to light flicker. Therefore, stochastic assessments of the risk and severity of light flicker are performed in a low voltage grid at different points of evaluation considering the propagation of voltage fluctuations between customers. In addition, the results of the severity of light flicker considering the response of a generalized LED lamp are compared to the severity obtained with an incandescent lamp.

Place, publisher, year, edition, pages
Luleå University of Technology, 2023
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Keywords
household devices, LED lamps, light flicker, low voltage grid, voltage fluctuations
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-97736 (URN)978-91-8048-339-1 (ISBN)978-91-8048-340-7 (ISBN)
Public defence
2023-10-23, Hörsal A, Luleå tekniska universitet, Skellefteå, 09:00 (English)
Opponent
Supervisors
Available from: 2023-06-01 Created: 2023-06-01 Last updated: 2024-08-28Bibliographically approved

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Gutierrez-Ballesteros, ElenaRönnberg, Sarah

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