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Busatto, T., Larsson, A., Rönnberg, S. & Bollen, M. (2019). Including Uncertainties from Customer Connections in Calculating Low-Voltage Harmonic Impedance. IEEE Transactions on Power Delivery
Open this publication in new window or tab >>Including Uncertainties from Customer Connections in Calculating Low-Voltage Harmonic Impedance
2019 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208Article in journal (Refereed) Epub ahead of print
Abstract [en]

A method is proposed in this paper to determine the harmonic impedances in low-voltage networks in a stochastic way. The consequences of resonances for harmonic propagation and stability of power converters are summarized. By using Monte Carlo simulation, the method includes the uncertainties in customer impedances, specifically due to electronic loads and local generation. The uncertainty in customer impedance is included by considering probability distribution for the resistive, inductive and capacitive parts of the impedance. The concept of transfer impedance is used for phase-to-neutral connections. A method is developed and applied to two existing low-voltage networks in Sweden. Results show that, for these two networks, the resonant frequencies decrease around 28 % once PV panels are installed. The paper includes a discussion of some of the practical aspects of applying the proposed method.

Place, publisher, year, edition, pages
IEEE, 2019
Keywords
Power Quality, power system harmonics, resonance, stochastic processes, Monte Carlo methods
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-72659 (URN)10.1109/TPWRD.2018.2881222 (DOI)
Funder
Swedish Energy Agency
Available from: 2019-01-23 Created: 2019-01-23 Last updated: 2019-01-29
Schwanz, D., Busatto, T., Bollen, M. & Larsson, A. (2018). A stochastic study of harmonic voltage distortion considering single-phase photovoltaic inverters. In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP: . Paper presented at 18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018. Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>A stochastic study of harmonic voltage distortion considering single-phase photovoltaic inverters
2018 (English)In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, the hosting capacity considering harmonic distortion is estimated for single-phase-connected photovoltaic inverters (PVIs) in low-voltage distribution networks. A stochastic approach is used to calculate the harmonic voltage distortion with each customer in the network. The method has been applied to a 6-customer network for the connection of 2.5-kW single-phase PVIs with and without harmonic voltage background. From the results, it was observed that the contribution from 2.5 kW single-phase photovoltaic inverters to the individual harmonic distortion will not cause the established limits to be exceeded. Also, that the harmonic voltage background is often dominating and should be continuously observed.

Place, publisher, year, edition, pages
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018
Series
International Conference on Harmonics and Quality of Power, E-ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-69529 (URN)10.1109/ICHQP.2018.8378889 (DOI)000444771900078 ()2-s2.0-85049249086 (Scopus ID)978-1-5386-0517-2 (ISBN)
Conference
18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018
Available from: 2018-06-14 Created: 2018-06-14 Last updated: 2018-10-10Bibliographically approved
Larsson, A. (2018). Assessment of recurrent oscillation parameters. In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP: . Paper presented at 18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018. Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Assessment of recurrent oscillation parameters
2018 (English)In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

Recurrent damped oscillation can occur more or less in the LV network due to different load connected. The recurrent oscillation has lower amplitude compared to other single damped oscillations events caused by e.g. lightning or switching actions. There is however a need to measure and quantify the recurrent oscillations to increase the understanding and possible consequences of these. This paper describes the phenomena and addresses different analyzing methods where ESPRIT seems to be the most promising analyzing method. In the end, the paper presents some result from a long term measurement at one site with recurrent oscillations and makes some comparisons of different analyzing methods.

Place, publisher, year, edition, pages
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018
Series
International Conference on Harmonics and Quality of Power, E-ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-69530 (URN)10.1109/ICHQP.2018.8378819 (DOI)000444771900008 ()2-s2.0-85049242378 (Scopus ID)978-1-5386-0517-2 (ISBN)
Conference
18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018
Available from: 2018-06-14 Created: 2018-06-14 Last updated: 2018-10-10Bibliographically approved
Schwanz, D., Bollen, M. & Larsson, A. (2018). Some methods for harmonic emission determination in wind power plants. In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP: . Paper presented at 18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018. Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Some methods for harmonic emission determination in wind power plants
2018 (English)In: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

The connection of new installations, as wind power plants, into the public grid requires that some conditions are fulfilled. Their aim is among others to ensure a proper power quality in the grid and to ensure a high probability of electromagnetic compatibility. The harmonic emission of individual sources is one of the power quality concerns, because they can damage and increase heating in devices. However, as there are other power electronics loads are connected, the correct assessment of the harmonic emission from one specific source is not straightforward. in this paper, a review of the most used methods for harmonic emission determination is presented and some considerations are discussed regarding their use in wind power plants harmonic contribution. Depending on the application, one method is more suitable than the other. However, assumptions are necessary with any method, especially for the harmonic impedances. For wind power plants not all the presented methods are suitable. Also, further investigations are needed to determine the harmonic impedance of the wind power plant and public grid, especially around resonant frequencies.

Place, publisher, year, edition, pages
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2018
Series
International Conference on Harmonics and Quality of Power, E-ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-69528 (URN)10.1109/ICHQP.2018.8378934 (DOI)000444771900123 ()2-s2.0-85049249859 (Scopus ID)978-1-5386-0517-2 (ISBN)
Conference
18th International Conference on Harmonics and Quality of Power (ICHQP 2018), Ljubljana, Slovenia, May 13–16 2018
Available from: 2018-06-14 Created: 2018-06-14 Last updated: 2019-02-07Bibliographically approved
Alfieri, L., Bracale, A., Carpinelli, G. & Larsson, A. (2017). A Wavelet-Modified ESPRIT Hybrid Method for Assessment of Spectral Components from 0 to 150 kHz. Energies, 10(1), Article ID 97.
Open this publication in new window or tab >>A Wavelet-Modified ESPRIT Hybrid Method for Assessment of Spectral Components from 0 to 150 kHz
2017 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 10, no 1, article id 97Article in journal (Refereed) Published
Abstract [en]

Waveform distortions are an important issue in distribution systems. In particular, the assessment of very wide spectra, that include also components in the 2-150 kHz range, has recently become an issue of great interest. This is due to the increasing presence of high-spectral emission devices like end-user devices and distributed generation systems. This study proposed a new sliding-window wavelet-modified estimation of signal parameters by rotational invariance technique (ESPRIT) method, particularly suitable for the spectral analysis of waveforms that have very wide spectra. The method is very accurate and requires reduced computational effort. It can be applied successfully to detect spectral components in the range of 0-150 kHz introduced both by distributed power plants, such as wind and photovoltaic generation systems, and by end-user equipment connected to grids through static converters, such as fluorescent lamps.

Place, publisher, year, edition, pages
MDPI, 2017
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-61935 (URN)10.3390/en10010097 (DOI)000392422500097 ()
Note

Validerad; 2017; Nivå 2; 2017-02-10 (andbra)

Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2018-11-16Bibliographically approved
Alfieri, L., Bracale, A., Carpinelli, G. & Larsson, A. (2017). Accurate assessment of waveform distortions up to 150 kHz due to fluorescent lamps. In: 2017 6th International Conference on Clean Electrical Power: Renewable Energy Resources Impact, ICCEP 2017: . Paper presented at 6th International Conference on Clean Electrical Power, ICCEP 2017, Santa Margherita Ligure, Italy, 27-29 June 2017 (pp. 636-644). Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), Article ID 8004756.
Open this publication in new window or tab >>Accurate assessment of waveform distortions up to 150 kHz due to fluorescent lamps
2017 (English)In: 2017 6th International Conference on Clean Electrical Power: Renewable Energy Resources Impact, ICCEP 2017, Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 636-644, article id 8004756Conference paper, Published paper (Refereed)
Abstract [en]

Fluorescent lamps are among the most diffuse electrical components that introduce significant waveform distortions in low voltage distribution systems. These distortions involve a wide range of frequencies (i.e., from 0 kHz to 150 kHz), and spectral components characterized by a non-uniform behavior in time and frequency domains. Early IEC standards covered formally only the range from 0 kHz to 9 kHz, defining grouping and group total harmonic distortion both for the low-frequencies (i.e., from 0 kHz to 2 kHz) and for frequencies ranging from 2 kHz to 9 kHz. Recently, the IEC standards have suggested to extend the grouping, previously defined for the range from 2 kHz to 9 kHz, also to the range from 9 kHz to 150 kHz. In this paper, the waveform distortions of a variable number of fluorescent lamps were quantified by applying the main Power Quality indices currently available for such devices. Indices are evaluated using both the IEC method and an hybrid method proposed recently in the relevant literature, i.e., the sliding-window Wavelet-Modified ESPRIT method. Numerical applications on measured data show the waveform distortion levels versus the number of lamps, quantifying also the different performances of the aforesaid spectral analysis methods

Place, publisher, year, edition, pages
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE), 2017
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-65599 (URN)10.1109/ICCEP.2017.8004756 (DOI)000426815100102 ()2-s2.0-85028518163 (Scopus ID)9781509046829 (ISBN)
Conference
6th International Conference on Clean Electrical Power, ICCEP 2017, Santa Margherita Ligure, Italy, 27-29 June 2017
Available from: 2017-09-12 Created: 2017-09-12 Last updated: 2018-06-14Bibliographically approved
Alfieri, L., Bracale, A. & Larsson, A. (2017). New Power Quality Indices for the Assessment of Waveform Distortions from 0 to 150 kHz in Power Systems with Renewable Generation and Modern Non-Linear Loads. Energies, 10(10), Article ID 1633.
Open this publication in new window or tab >>New Power Quality Indices for the Assessment of Waveform Distortions from 0 to 150 kHz in Power Systems with Renewable Generation and Modern Non-Linear Loads
2017 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 10, no 10, article id 1633Article in journal (Refereed) Published
Abstract [en]

The widespread use of power electronics converters, e.g., to interface renewable generation systems with the grid or to supply some high-efficiency loads, has caused increased levels of waveform distortions in the modern distribution system. Voltage and current waveforms include spectral components from 0 kHz to 150 kHz, characterized by a non-uniform time-frequency behavior. This wide interval of frequencies is currently divided into "low-frequency" (from 0 kHz to 2 kHz) and "high-frequency" (from 2 kHz to 150 kHz). While the low-frequencies have been exhaustively investigated in the relevant literature and are covered by adequate standardization, studies for the high-frequencies have been addressed only in the last decade to fill current regulatory gaps. In this paper, new power quality (PQ) indices for the assessment of waveform distortions from 0 kHz to 150 kHz are proposed. Specifically, some currently available indices have been properly modified in order to extend their application also to wide-spectrum waveforms. In the particular case of waveform distortions due to renewable generation, numerical applications prove that the proposed indices are useful tools for the characterization of problems (e.g., overheating, equipment malfunctioning, losses due to skin effects, hysteresis losses or eddy current losses) in cases of both low-frequency and high-frequency distortions

Place, publisher, year, edition, pages
MDPI, 2017
Keywords
power quality indices; waveform distortions; high-frequency spectral components; fluorescent lamps; renewable generation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-66531 (URN)10.3390/en10101633 (DOI)000414578400188 ()2-s2.0-85044466671 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-11-09 (andbra)

Available from: 2017-11-09 Created: 2017-11-09 Last updated: 2019-01-16Bibliographically approved
Schwanz, D., Bollen, M. & Larsson, A. (2016). A Review of Solutions for Harmonic Mitigation. In: 2016 17th International Conference on Harmonics and Quality of Power: . Paper presented at 17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016 (pp. 30-35). Piscataway, NJ: IEEE Computer Society, Article ID 7783422.
Open this publication in new window or tab >>A Review of Solutions for Harmonic Mitigation
2016 (English)In: 2016 17th International Conference on Harmonics and Quality of Power, Piscataway, NJ: IEEE Computer Society, 2016, p. 30-35, article id 7783422Conference paper, Published paper (Refereed)
Abstract [en]

With the increasing of non-linear equipments connected in the network, mitigation solutions are needed to avoid and solve harmonic and resonance problems that may damage equipments and avoid their connection into the grid. Several are the solutions given to this problem; however, not all them are suitable for all situations. For it, in this paper a review of the most used harmonic solutions and some new technologies are presented. The advantages and disadvantages are described and the most used passive, active and hybrid solutions are described

Place, publisher, year, edition, pages
Piscataway, NJ: IEEE Computer Society, 2016
Series
International Conference on Harmonics and Quality of Power, ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-60505 (URN)10.1109/ICHQP.2016.7783422 (DOI)000391424200006 ()2-s2.0-85009507997 (Scopus ID)9781509037926 (ISBN)
Conference
17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2019-02-07Bibliographically approved
Schwanz, D., Bagheri, A., Bollen, M. & Larsson, A. (2016). Active harmonic filters: control techniques review. In: 17th International Conference on Harmonics and Quality of Power: . Paper presented at 17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016 (pp. 36-41). Piscataway, NJ, Article ID 7783423.
Open this publication in new window or tab >>Active harmonic filters: control techniques review
2016 (English)In: 17th International Conference on Harmonics and Quality of Power, Piscataway, NJ, 2016, p. 36-41, article id 7783423Conference paper, Published paper (Refereed)
Abstract [en]

The use of active filters for harmonic mitigation compensation is increasing together with the improvement of their control techniques. Depending on the situation, the use of one technique instead of the other makes the difference of achieving a better harmonic mitigation or not. In this paper, a review of control techniques related to harmonic filters for harmonic mitigation is presented, together with the advantages and disadvantages. From the literature review it was observed that new techniques are being used and classical ones are being improved.

Place, publisher, year, edition, pages
Piscataway, NJ: , 2016
Series
International Conference on Harmonics and Quality of Power, ISSN 1540-6008
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-60507 (URN)10.1109/ICHQP.2016.7783423 (DOI)000391424200007 ()2-s2.0-85009508817 (Scopus ID)9781509037926 (ISBN)
Conference
17th International Conference on Harmonics and Quality of Power (ICHQP), Belo Horizonte, Brasil, 16-19 October 2016
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2018-06-14Bibliographically approved
Beek, J. v., Bollen, M., Larsson, A. & Eriksson, M. (2016). Can Solar Power Help Providing Broadband Cellular Coverage in Extreme-Rural Sweden? (ed.). Paper presented at . Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Can Solar Power Help Providing Broadband Cellular Coverage in Extreme-Rural Sweden?
2016 (English)Report (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2016. p. 25
Series
Research report / Luleå University of Technology, ISSN 1402-1528
National Category
Signal Processing Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Signal Processing; Electric Power Engineering; Enabling ICT (AERI); Renewable energy (AERI)
Identifiers
urn:nbn:se:ltu:diva-24024 (URN)95bfb06e-e75f-48cd-9ee9-ee4527bfb5c5 (Local ID)978-91-7583-656-0 (ISBN)95bfb06e-e75f-48cd-9ee9-ee4527bfb5c5 (Archive number)95bfb06e-e75f-48cd-9ee9-ee4527bfb5c5 (OAI)
Note

För godkännande; 2016; 20160629 (jaavan)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-06-14Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-9103-0226

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