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Wahlberg, Mats
Publications (10 of 40) Show all publications
Wahlberg, M. & Rönnberg, S. (2017). Case study on electrical conductivity in wood poles.
Open this publication in new window or tab >>Case study on electrical conductivity in wood poles
2017 (English)Report (Other academic)
Publisher
p. 38
Series
Technical report / Luleå University of Technology, ISSN 1402-1536
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-62165 (URN)978-91-7583-828-1 (ISBN)
Available from: 2017-02-24 Created: 2017-02-24 Last updated: 2017-11-24Bibliographically approved
Larsson, A., Gil-de-Castro, A., Wahlberg, M. & Bollen, M. (2015). Field and laboratory measurements of interference with light equipment due to waveform distortion originating from a large rectifier (ed.). Paper presented at International Conference and Exhibition on Electricity Distribution : 15/06/2015 - 18/06/2015. Paper presented at International Conference and Exhibition on Electricity Distribution : 15/06/2015 - 18/06/2015.
Open this publication in new window or tab >>Field and laboratory measurements of interference with light equipment due to waveform distortion originating from a large rectifier
2015 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

This paper will present a case study where light in anoffice building is disturbed and do not function properly.From measurements it is shown that a UPS system iscausing distortions. One lamp from the office wasbrought to laboratory where the distortions was repeatedand subjected to the lamp. When doing so the lampshowed the same immunity problem.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-37390 (URN)b64ead84-d534-4137-8bc1-b2ae56b74e67 (Local ID)b64ead84-d534-4137-8bc1-b2ae56b74e67 (Archive number)b64ead84-d534-4137-8bc1-b2ae56b74e67 (OAI)
Conference
International Conference and Exhibition on Electricity Distribution : 15/06/2015 - 18/06/2015
Note
Godkänd; 2015; 20150625 (matbol)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-06-14Bibliographically approved
Yang, K., Bollen, M., Larsson, A. & Wahlberg, M. (2014). A statistic study of harmonics and interharmonics at a modern wind-turbine (ed.). Paper presented at International Conference on Harmonics and Quality of Power : 25/05/2014 - 28/05/2014. , 718-722, Article ID 6842921.
Open this publication in new window or tab >>A statistic study of harmonics and interharmonics at a modern wind-turbine
2014 (English)In: International Conference on Harmonics and Quality of Power. Proceedings: , p. 718-722, article id 6842921Article in journal (Refereed) Published
Abstract [en]

The work presents measurements of harmonics and interharmonics from a modern wind turbine over a period of several days, using a conventional power quality monitor. A statistical study has been performed to present the characteristics of the emission during the measurement. A variation of emission has been observed, especially for interharmonics within certain low-frequency bands and for the switching frequency. Multiple relations between voltage and current components have been presented, as well as multiple relations between the emission and the active-power production. Generally, harmonics are independent of the active-power, whereas interharmonics are dependent on it.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-34858 (URN)10.1109/ICHQP.2014.6842921 (DOI)2-s2.0-84904283452 (Scopus ID)92aee836-c981-47d3-9785-093e370e66e0 (Local ID)92aee836-c981-47d3-9785-093e370e66e0 (Archive number)92aee836-c981-47d3-9785-093e370e66e0 (OAI)
Conference
International Conference on Harmonics and Quality of Power : 25/05/2014 - 28/05/2014
Note

Godkänd; 2014; 20140806 (johsod); Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-08-16Bibliographically approved
Wahlberg, M. & Rönnberg, S. (2014). Design of power lines poles that will be safe even when a phase has come in contact with crossarm. (ed.). Paper presented at Nordic Conference on Electricity Distribution System Management and Development : 08/09/2014 - 09/09/2014. Paper presented at Nordic Conference on Electricity Distribution System Management and Development : 08/09/2014 - 09/09/2014.
Open this publication in new window or tab >>Design of power lines poles that will be safe even when a phase has come in contact with crossarm.
2014 (English)Conference paper, Oral presentation only (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-35707 (URN)a5b4090d-de40-48df-9be0-f269fdeedb3f (Local ID)a5b4090d-de40-48df-9be0-f269fdeedb3f (Archive number)a5b4090d-de40-48df-9be0-f269fdeedb3f (OAI)
Conference
Nordic Conference on Electricity Distribution System Management and Development : 08/09/2014 - 09/09/2014
Note
Godkänd; 2014; 20141210 (ronsar)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Gil-de-Castro, A., Rönnberg, S., Bollen, M., Wahlberg, M. & Moreno-Munoz, A. (2014). Emission on the low voltage grid: measurements in an urban area (ed.). Paper presented at International Conference on Renewable Energies and Power Quality : 07/04/2014 - 10/04/2014. The Renewable Energies and Power Quality Journal (RE&PQJ) (12), Article ID 472.
Open this publication in new window or tab >>Emission on the low voltage grid: measurements in an urban area
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2014 (English)In: The Renewable Energies and Power Quality Journal (RE&PQJ), ISSN 2172-038X, E-ISSN 2172-038X, no 12, article id 472Article in journal (Refereed) Published
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-33018 (URN)7bc22eb1-4492-4dcb-bdfc-9d389f764f0d (Local ID)7bc22eb1-4492-4dcb-bdfc-9d389f764f0d (Archive number)7bc22eb1-4492-4dcb-bdfc-9d389f764f0d (OAI)
Conference
International Conference on Renewable Energies and Power Quality : 07/04/2014 - 10/04/2014
Note
Godkänd; 2014; 20140422 (matbol); Konferensartikel i tidskriftAvailable from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-30Bibliographically approved
Yang, K., Cundeva, S., Bollen, M. & Wahlberg, M. (2014). Measurements of harmonic and interharmonic emission from wind power systems (ed.). Paper presented at . Russian Electrical Engineering, 85(12), 769-776
Open this publication in new window or tab >>Measurements of harmonic and interharmonic emission from wind power systems
2014 (English)In: Russian Electrical Engineering, ISSN 1068-3712, Vol. 85, no 12, p. 769-776Article in journal (Refereed) Published
Abstract [en]

With increasing amounts of wind power connected, the power system is impacted in a number of ways. In this paper, the emphasis is on one of those impacts: the harmonic and interharmonic emission from wind-power installations. The emission of individual wind turbines as well as from a wind park has been studied. The spectrum as a function of active-power has been studied. Various trends of emission according to the output power have been presented. For four modern wind turbines estimations have been done on the impact on the grid for each harmonic and interharmonic subgroup. The primary emission from a complete windpark due to the emission from the turbines has been analyzed

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-7103 (URN)10.3103/S1068371214120177 (DOI)2-s2.0-84923845147 (Scopus ID)56c752f7-f92b-4ac6-bb14-7a19e330cd08 (Local ID)56c752f7-f92b-4ac6-bb14-7a19e330cd08 (Archive number)56c752f7-f92b-4ac6-bb14-7a19e330cd08 (OAI)
Note
Godkänd; 2014; Nivå 0; 20141209 (matbol)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Yang, K., Bollen, M., Larsson, A. & Wahlberg, M. (2014). Measurements of harmonic emission versus active power from wind turbines (ed.). Paper presented at . Electric power systems research (108), 304-314
Open this publication in new window or tab >>Measurements of harmonic emission versus active power from wind turbines
2014 (English)In: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, no 108, p. 304-314Article in journal (Refereed) Published
Abstract [en]

This paper presents harmonic measurements from three individual wind turbines (2 and 2.5MW size). Both harmonics and interharmonics have been evaluated, especially with reference to variations in the active-power production. The overall spectra reveal that, emission components may occur at any frequency and not only at odd harmonics. Interharmonics and even harmonics emitted from wind turbines are relatively high. Individual frequency components depend on the power production in dierent ways: characteristic harmonics are independent of power; interharmonics show a strong correlation with power; other harmonic and interharmonic components present various patterns. It is concluded that the power production is not the only factor determining the current emission of a wind energy conversion system.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-6890 (URN)10.1016/j.epsr.2013.11.025 (DOI)000331509700031 ()2-s2.0-84890924092 (Scopus ID)5378e7a2-6cd7-4db3-9ba1-00c82ce81b36 (Local ID)5378e7a2-6cd7-4db3-9ba1-00c82ce81b36 (Archive number)5378e7a2-6cd7-4db3-9ba1-00c82ce81b36 (OAI)
Note
Validerad; 2014; 20131219 (kaiyan)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Larsson, A., Wahlberg, M. & Bollen, M. (2014). Reduced life-time of lamps: Temperature rise and bad power quality (ed.). Paper presented at International Conference on Harmonics and Quality of Power : 25/05/2014 - 28/05/2014. , 322-326, Article ID 6842780.
Open this publication in new window or tab >>Reduced life-time of lamps: Temperature rise and bad power quality
2014 (English)Article in journal (Refereed) Published
Abstract [en]

To save energy, many new buildings have modern energy saving lighting installed. In large department or grocery stores the use of fluorescent lamps powered by high frequency electronic ballast is common. There are however consistent reports of large numbers of failures of the electronic ballast of these lamps. The failures of the electronic ballast are due to high temperature or bad power quality. But neither of these reasons has been confirmed as the cause. This paper discusses in general the lifetime of electronic ballast. The paper also presents detailed analysis of results from measurement performed in a grocery store where high instances of failure have been observed. Both temperature and power quality in the harmonic range and 2 to 150 kHz have been included in the measurements

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-38371 (URN)10.1109/ICHQP.2014.6842780 (DOI)2-s2.0-84904364405 (Scopus ID)cbe63d4d-d4b3-4b2c-9ee6-86e42709ca46 (Local ID)cbe63d4d-d4b3-4b2c-9ee6-86e42709ca46 (Archive number)cbe63d4d-d4b3-4b2c-9ee6-86e42709ca46 (OAI)
Conference
International Conference on Harmonics and Quality of Power : 25/05/2014 - 28/05/2014
Note
Godkänd; 2014; 20140813 (andbra); Konferensartikel i tidskriftAvailable from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
Yang, K., Bollen, M. & Wahlberg, M. (2014). Wind power harmonic emission versus active-power production (ed.). Paper presented at Nordic Conference on Electricity Distribution System Management and Development : 08/09/2014 - 09/09/2014. Paper presented at Nordic Conference on Electricity Distribution System Management and Development : 08/09/2014 - 09/09/2014.
Open this publication in new window or tab >>Wind power harmonic emission versus active-power production
2014 (English)Conference paper, Oral presentation only (Refereed)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-32795 (URN)7659baee-5777-4bc8-8e9e-580dea5281d7 (Local ID)7659baee-5777-4bc8-8e9e-580dea5281d7 (Archive number)7659baee-5777-4bc8-8e9e-580dea5281d7 (OAI)
Conference
Nordic Conference on Electricity Distribution System Management and Development : 08/09/2014 - 09/09/2014
Note
Godkänd; 2014; 20141209 (matbol)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Yang, K., Cundeva, S., Bollen, M. & Wahlberg, M. (2013). Harmonic aspects of wind-power installations (ed.). Paper presented at International Conference on Applied Electromagnetics : 01/09/2013 - 04/09/2013. Paper presented at International Conference on Applied Electromagnetics : 01/09/2013 - 04/09/2013.
Open this publication in new window or tab >>Harmonic aspects of wind-power installations
2013 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

With increasing amounts of wind power connected, the power system is impacted in a number of ways. In this paper, the emphasis has been on one of those impacts: the harmonic emission from wind-power installations. The harmonic emission of individual wind turbines as well as from a wind park has been studied. For four modern wind turbines estimations have been done on the impact on the grid per harmonic and interharmonic group. The primary emission from complete windpark due to the emission from the turbines has been analyzed.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electric Power Engineering
Identifiers
urn:nbn:se:ltu:diva-35345 (URN)9da845f1-405a-4689-b197-ef70e1754be6 (Local ID)9da845f1-405a-4689-b197-ef70e1754be6 (Archive number)9da845f1-405a-4689-b197-ef70e1754be6 (OAI)
Conference
International Conference on Applied Electromagnetics : 01/09/2013 - 04/09/2013
Note
Godkänd; 2013; 20130905 (kaiyan)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
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