Procjena stabilnosti sinkronog generatora u stvarnom vremenu

doctoral thesis

• Title (english): Real time stability estimation of synchronous generator
• Author: Neven Bulić
• Mentor: Zlatko Maljković (mentor)
• Mentor: Gorislav Erceg (komentor)
• Committee member: Sejid Tešnjak (predsjednik povjerenstva)
• Committee member: Zlatko Maljković (član povjerenstva)
• Committee member: Gorislav Erceg (član povjerenstva)
• Committee member: Ivan Gašparac (član povjerenstva)
• Committee member: Vesna Županović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electric Machines, Drives and Automation); Zagreb
• Defense date and country: 2009-01-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Pod pojmom dinamičke stabilnosti smatra se sposobnost prigušenja elektromehaničkih oscilacija, te se smatra da sinkroni generator počinje gubiti stabilnost s gubitkom prigušenja elektromehaničkih oscilacija. Korišteni pristup je sljedeći: određivanje matrice sustava iz mjerenih veličina te izračun svojstvenih vrijednosti matrice sustava. Devijacija kuta opterećenja, devijacija brzine i devijacija struja uzbude su mjerene varijable stanja koje su se koristile kod identifikacije matrice sustava trećeg reda rekurzivnom metodom najmanjih kvadrata. Na temelju obavljene identifikacije određene su svojstvene vrijednosti sinkronog generatora te je iz njih određen karakter elektromehaničkih oscilacija u radnoj točki te u okolišu bliskom radnoj točki. Promjenom radnih točaka sinkronog generatora, promjenom parametara sustava regulacije uzbude sinkronog generatora mijenja se i karakter elektromehaničkih oscilacija te samim tim i svojstvenih vrijednosti sustava. Simulacijski se je ispitalo djelovanje identifikacijskog algoritma i algoritma za izračun svojstvenih vrijednosti. Predloženi algoritm je implementiran u digitalni sustav upravljanja uzbudom te ispitan na sinkronom generatoru snage 83 kVA koji je preko prijenosnog voda i transformatora spojen na elektroenergetski sustav. Svi algoritmi za implementaciju u digitalni sustav upravljanja su napisani u programskom jeziku C. Eksperimentom je potvrđeno ispravno djelovanje algoritma za procjenu stabilnosti.

Abstract (english)

Term of dynamical stability means the capability of damping small signal electromechanically oscillation. Loss of stability is practically loss of damping. Problem of stability estimation is treated on following way first system matrix is estimated from measured signal and eigenvalues are determined from system matrix. Eigenvalues determine the behavior of system. Measured signals for recursive least square identification processes are load angle deviation, deviation of speed and excitation current. After the system matrix is identified eigenvalue are determined and the nature of oscillation is known in current operation point and in its nearest area. Changing the operating points the nature of oscillation is changing and consequence of that is change of eigenvalue. Algorithm for stability estimation is simulated on computer and prepared for implementation in digital excitation control system. Algorithm is implemented in digital excitation control system and tested on 83 kVA synchronous generator connected over reactance on AC network. Complete algorithm is written in C language with usage of explicit instead recursive algorithm for eigenvalue determination. Experimental results shows that algorithm for stability estimation correctly determine stability limit.

• Keywords: dinamička stabilnost; svojstvene vrijednosti; sinkroni generator; procjena stabilnosti u stvarnom vremenu
• Keywords (english): dynamical stability; eigenvalue; synchronous generator; real time stability estimation
• Language: croatian
• URN:NBN: urn:nbn:hr:168:646295
• Project: Number: 036-0361616-1617; Title: Revitalizacija i pogon hidrogeneratora; Leader: Zlatko Maljković; Jurisdiction: Croatia; Funder: MZOS; Funding stream: ZP
• Project: Number: 036-0361621-1626; Title: Upravljanje sinkronim agregatom s obzirom na zahtjeve elektroenergetskog sustava; Leader: Gorislav Erceg; Jurisdiction: Croatia; Funder: MZOS; Funding stream: ZP
• 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)
• Catalog URL: http://lib.fer.hr/cgi-bin/koha/opac-detail.pl?biblionumber=33271
• Type of resource: Text
• Extent: 212 str.
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-03-19 11:30:37