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Børsteløs magnetisering gir bedre nettstabilitet
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Hydropower)ORCID iD: 0000-0002-3656-1032
2016 (Norwegian)In: Energiteknikk : fagbladet for energibransjen, no 6, 50-51 p.Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [no]

Børsteløse magne seringsutrustninger kom på 1950-tallet etter er utviklingen av kompakte høyeffekts silisium- dioder. I prinsippet bygde man en forvrengt synkronmaskin og puttet den på samme akslingen som synkrongeneratoren. Feltviklingen på denne maskinen lå i stator, mens den trefasede armaturviklingen ble satt i rotor. En roterende diodebro paå akslingen knyttet magnetiseringsmaskinen sammen med generatorens feltvikling.Den trege responsen l den børsteløse magnetiseringsutrustningen er hovedårsaken l at den ikke slo igjennom tross redusert vedlikehold av magnetiseringssystemet. Paå 1980-tallet forsøkte man å bygge en magnetiseringsmaskin med lave induktanser for å gjøre responsen like rask som statiske magnetiseringsutrustninger. Denne artikkelen viser til at den roterende diodebroen kan byttes ut med en thyristorbro på akslingen, og dermed forbedre stegresponsen. I tillegg har systemet fordeler i forhold til magnetiserinssystemets evne til å motstå spenningsdipper på nett, derav FRT-kapabilitet. En sammenligning med statisk system blir gjort.

Place, publisher, year, edition, pages
ElektoMedia AS , 2016. no 6, 50-51 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
URN: urn:nbn:se:uu:diva-317779OAI: oai:DiVA.org:uu-317779DiVA: diva2:1082790
Available from: 2017-03-17 Created: 2017-03-17 Last updated: 2017-03-23Bibliographically approved
In thesis
1. A New Paradigm for Large Brushless Hydrogenerators: Advantages Beyond the Static System
Open this publication in new window or tab >>A New Paradigm for Large Brushless Hydrogenerators: Advantages Beyond the Static System
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The grid code, FIKS, from the Norwegian transmission system operator (TSO), Statnett, states that synchronous generators > 25MVA, must have a static excitation system. However, an improved brushless excitation system is in operation on some commercial power plants (36MVA, 93.75rpm & 52MVA, 166.67rpm) with grid-assisting performance beyond the conventional static system. The convenional diode bridge is replaced with a remote-controlled thyristor bridge on the shaft. If wireless communication is not allowed, a control signal through brushes should be employed instead. The thesis explores the expected new era for large brushless hydrogenerators. The proposed brushless system have benefits of reduced regular maintenance due to elimination of brushes and reduced unscheduled maintenance due to redundancy; causing a redused cost-of-energy. A six-phase exciter design with a hybrid-mode thyristor bridge interface leads to improved fault-tolerance, better controllability, minimized torque pulsations and reduced armature currents of the exciter. Excitation boosting (EB) capability is included in the brushless system without additional components or circuitry, contrary to the static excitation system. The brushless excitation system is made insensitive to voltage dips in the interconnected grid, causing improved fault ride-through (FRT) capability and power system stabilizer (PSS) actions. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. 93 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1491
Keyword
Brushless exciters, Rotating exciters, Permanent Magnet Machines, Synchronous Generator Excitation, Thyristor Rectifiers, Chopper Rectifiers
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-317780 (URN)978-91-554-9859-7 (ISBN)
Public defence
2017-05-10, Häggsalen, Ångströmlaboratoriet, Polacksbacken, Lägerhyddsvägen 2, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2017-04-19 Created: 2017-03-17 Last updated: 2017-04-19

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