Numerički proračun utjecaja statorskog prigušnog namota na karakteristike turbogeneratora

doctoral thesis

• Title (english): Numerical computation of influence of stator damping winding of turbogenerator characteristics
• Author: Kristina Čelić-Baran
• Mentor: Zijad Haznadar (mentor)
• Committee member: Sead Berberović (predsjednik povjerenstva)
• Committee member: Stjepan Car (član povjerenstva)
• Committee member: Zlatko Maljković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2010-03-03, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U disertaciji je predloženo rješenje i analizirano djelovanje novog aktivnog konstrukcijskog elementa sinkronih generatora - prigušnog namota statora. Njegov utjecaj na karakteristike turbogeneratora istraživan je na primjeru dvopolnog i četveropolnog generatora, a razmatranja vrijede za bilo koji stroj u koji bi se ugradio taj namot.
Djelovanje prigušnog namota statora sagledano je u okviru klasične dvoosne teorije električnih strojeva dok je analiza provedena 2D metodom konačnih elemenata uz korištenje analitički izračunatih rasipnih reaktancija za dijelove namota u čeonom prostoru.
Dokazano je da prigušni namot statora djeluje u svim režimima rada obzirom da on reagira na bilo koju promjenu magnetskog polja koja se događa u jarmu statora na čijem je vanjskom obodu smješten. On utječe na vrijednosti uzbudne struje kojom se magnetizira stator kao i na harmonički sadržaj polja u jarmu statora. Utjecaj prigušnog namota statora na smanjenje buke elektromagnetskog porijekla analiziran je primjenom diskretne Fourierove transformacije (DTF). Iako značajan, taj utjecaj nije jednoznačan i ovisi o geometriji kako samog stroja tako i prigušnog namota statora, te ga je potrebno sagledati za svaki konkretni slučaj.
Provedenim mjerenjima gubitaka u statorskom paketu dokazan je i utjecaj prigušnog namota statora na smanjenje gubitaka praznog hoda. Ugradnja tog elementa osobito je interesantna zbog smanjenja opterećenja uzbudnog namota kod revitalizacija s povećanjem snage, kod generatora kod kojih se zahtijeva visoki stupanj korisnosti, te kod strojeva najvećih jediničnih snaga.

Abstract (english)

The dissertation proposed a solution and analyzed the action of a new active structural element of synchronous generators - the damping stator winding. Its influence on the characteristics of the turbogenerator was investigated on the example of two-pole and four-pole generators, and the considerations are valid for any machine in which this winding would be installed. The operation of the stator damping winding is considered in the framework of the classic two-axis theory of electric machines, while the analysis was carried out using the 2D finite element method with the use of analytically calculated stray reactances for parts of the winding in the frontal space. It has been proven that the damping stator winding works in all modes of operation, since it reacts to any change in the magnetic field that occurs in the stator yoke, on the outer rim of which it is located. It affects the values of the excitation current that magnetizes the stator as well as the harmonic content of the field in the stator yoke. The influence of the stator damping winding on the reduction of noise of electromagnetic origin was analyzed using discrete Fourier transformation (DTF). Although significant, this influence is not unequivocal and depends on the geometry of both the machine itself and the stator damping winding, and it is necessary to consider it for each specific case. Measurements of the losses in the stator package also proved the influence of the damping stator winding on the reduction of idle losses. The installation of this element is particularly interesting due to the reduction of the load on the excitation winding in revitalizations with increased power, in generators that require a high level of utility, and in machines with the highest unit power.

• Keywords: prigušni namot statora; turbogenerator; metoda konačnih elemenata; rasipna elektromagnetska polja; elektromagnetska buka
• Keywords (english): stator damper winding; turbogenerator; finite element method; leakage magnetic fields; acoustic noise of electromagnetic origin
• Language: croatian
• URN:NBN: urn:nbn:hr:168:194478
• Promotion: 2010
• Study programme: Title: Doctoral study programme "Electrical Engineering and Computing"; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
• Type of resource: Text
• Extent: 150 str. : graf. prikazi
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-18 13:02:24