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| 2. |
- Kehoe, Laura, et al.
(author)
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Make EU trade with Brazil sustainable
- 2019
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In: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 364:6438, s. 341-
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Journal article (other academic/artistic)
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| 3. |
- Alonso-Rosa, Manuel, et al.
(author)
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An IoT based mobile augmented reality application for energy visualization in buildings environments
- 2020
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In: Applied Sciences. - : MDPI. - 2076-3417. ; 10:2
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Journal article (peer-reviewed)abstract
- Augmented reality (AR) improves how we acquire, understand, and display information without distracting us from the real world. These technologies can be used in different applications and industries as they can incorporate domain-specific visualizations on a real-world screen. Mobile augmented reality (MAR) essentially consists of superimposing virtual elements over real objects on the screen, to give added value and enrich the interaction with reality. In numerous plants, it is being used for maintenance and repair tasks, as well as training. The Internet of Things (IoT) is increasingly pervading every aspect of our lives, including the power infrastructure of our buildings. IoT-enabled devices offer many connectivity options for helping supervise all-important energy assets. Aggregating data to cloud-based platforms enables operations teams to have on-time information access to make fast decisions and have a fast response regarding energy use, while maintenance teams keep on top of the appliance power quality and reliability needed by using MAR. This paper presents a novel approximation for visualizing appliance-related power quality to enhance awareness about the consumed electricity. A combined solution of MAR with IoT technologies is employed. Engineered solutions’ hands-free way to get data about surrounding appliances reduces the complexity, saves energy, and speeds up the operations. An innovative way to measure things at the right time leads to a competitive advantage.
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| 4. |
- Alvarez, Manuel, et al.
(author)
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A Smart Distribution Toolbox for Distribution System Planning
- 2015
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Conference paper (peer-reviewed)abstract
- The distribution system planner should be able to coordinate smart grid solutions in order to find cost effective expansions plans. These plans should be able to deal with new added system uncertainties from renewable production and consumers while guaranteeing power quality and availability of supply. This paper proposes a structure for distribution systems planning oriented to help the planner in deciding how to make use of smart solutions for achieving the described task. Here, the concept of a system planning toolbox is introduced and supported with a review of relevant works implementing smart solutions. These are colligated in a way that the system planner can foresee what to expect with their combined implementation. Future developments in this subject should attempt to theorize a practical algorithm in an optimization and decision making context.
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| 5. |
- Blanco, Ana Maria, et al.
(author)
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Impact of flat-top voltage waveform distortion on harmonic current emission and summation of electronic household appliances
- 2018
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In: The Renewable Energies and Power Quality Journal. - : EA4EPQ-European Association for the Development of Renewable Energy, Environment and Power Quality. - 2172-038X. ; 1:16, s. 698-703
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Journal article (peer-reviewed)abstract
- Electronic household appliances are non-linear loads and emit harmonics into the low voltage networks. Usually, these loads are simply modelled by constant current source models, which only represent the harmonic emission of the appliances for a single supply voltage distortion, mostly sinusoidal conditions. Measurements have shown that the harmonic currents emitted by electronic devices can significantly depend on the circuit topology and the existing supply voltage distortion. This paper studies the impact of supply voltage distortion, which can be typically found in public low voltage networks (so-called flat-top voltage waveform), on the harmonic current emission of individual devices with different circuit topologies as well as the impact of supply voltage distortion on the harmonic summation of these devices.
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| 6. |
- Bollen, Math, et al.
(author)
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Characterization methods and typical levels of variations in rms voltage at the time scale between 1 second and 10 minutes
- 2020
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In: Electric power systems research. - : Elsevier. - 0378-7796 .- 1873-2046. ; 184
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Journal article (peer-reviewed)abstract
- Voltage magnitude deviation from its nominal value varies over a range of time scales. This paper concentrates on the range between 1 s and 10 min as part of the long-term aim of obtaining a complete picture of voltage magnitude variations at time scales below ten minutes. Time series of voltage with 1-s time resolution are obtained at 57 locations around the world. The main contributions of the paper are: the definition of additional indices in the sub-10-minute time scale from the 1-s rms voltages; statistics on the values of these indices for different locations; identifying the need for further research through a set of recommendations to the research community. It is shown, among others, that for the available data set, the voltage typically varies between 0.5 V and 5 V within a 10-min window; a range exceeding 1 or 2 V is common; a range exceeding 5 V is uncommon.The need for the indices proposed in this paper is justified as equipment connected to the grid is changing and to help managing and for storing the huge amount of data resulting from power-quality measurements at many sites during several years.
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| 7. |
- Bollen, Math, et al.
(author)
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Future work on harmonics : some expert opinions part I – wind and solar power
- 2014
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In: Proceedings - International Conference on Harmonics and Quality of Power. - : IEEE. - 1540-6008 .- 2164-0610. ; , s. 904-908
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Journal article (peer-reviewed)abstract
- A workshop on power system harmonics was organized in Stockholm in January 2014. On the agenda was among others a discussion on what are the main issues on harmonics at the moment and in the near future. The results of this discussion are summarized in this paper and some of the issues are discussed in more detail in this paper and in its companion paper. This paper discusses emission from wind and solar power as well as advantages and disadvantages of active and passive filters.
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| 8. |
- Bollen, Math, et al.
(author)
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Typical harmonic levels and spectra with low-voltage customers
- 2019
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In: CIRED 2019 Proceedings. - : AIM.
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Conference paper (peer-reviewed)abstract
- This paper presents levels of harmonic voltage distortion with low-voltage customers during 2017 and 2018. Measurements were obtained over a period between one hour and one day per location. Results are presented for the harmonics in the phase-to-neutral voltage at 163 locations; the highest 10-minute values per location have been used for presenting the results. For harmonics in the neutral-to-ground voltage, 1-second values at 88 locations have been used. The harmonic levels showed to be well below the limits in EN 50160 and IEC 61000-2-2 for almost all locations and for all harmonics with exception of harmonics 9, 15 and 21. The dominating frequencies at most locations are harmonics 5 and 7.
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| 9. |
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| 10. |
- Gil-de-Castro, Aurora, et al.
(author)
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A study about harmonic interaction between devices
- 2014
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In: Proceedings - International Conference on Harmonics and Quality of Power. - : IEEE. - 1540-6008 .- 2164-0610. ; , s. 728-732
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Journal article (peer-reviewed)abstract
- This paper presents an analysis of current emission from low-voltage appliances in the frequency range from 2 to 150 kHz. The current to an electric vehicle is measured for different connection of other devices (LED lamp, microwave oven, TV) showing the presence of primary and secondary emission. The paper shows that the presence of a neighboring device can have a strong influence on the emission.
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