Hibridni algoritam estimacije stanja elektroenergetskog sustava podržan sinkroniziranim mjerenjima fazora

doctoral thesis

• Title (english): Hybrid algorithm of power system state estimation assisted by phasor measurements
• Author: Vedran Kirinčić
• Mentor: Ante Marušić (mentor)
• Mentor: Srđan Skok (komentor)
• Committee member: Ante Marušić (član povjerenstva)
• Committee member: Srđan Skok (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Granter: University of Rijeka; Faculty of Engineering; (Department of Electric Power Systems); Rijeka
• Defense date and country: 2013-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Razvijeni višeslojni hibridni estimator stanja elektroenergetskog sustava koristi SCADA (engl. Supervisory Control And Data Acquisition) mjerenja i sinkronizirana mjerenja fazora, dostupna iz PMU jedinica (engl. Phasor Measurement Unit). Model hibridnog estimatora stanja je prikazan u statičkoj i dinamičkoj formulaciji. Linearni estimator stanja u prvom koraku statičke formulacije koristi samo sinkronizirana mjerenja fazora. Estimator stanju u drugom sloju koristi iterativnu WLS (engl. Weighted Least Squares) metodu s ograničenjima jednakosti za injekcije snage u pasivnim čvorištima te kombinira SCADA mjerenja s pseudo-mjerenjima dobivenim iz rezultata prvog sloja formulacije. Rezultati estimatora stanja prvog sloja se također koriste prilikom inicijalizacije estimatora stanja drugog sloja. Dinamička formulacija u prvom sloju iskorištava visoku učestalost sinkroniziranih mjerenja fazora, dostupnih u intervalu između dva pokretanja estimatora stanja drugog sloja. Višeslojni hibridni estimator stanja je ispitan na IEEE test sustavima s 14, 57 i 118 čvorišta. Kao primjer stvarnog sustava je korišten model dijela prijenosnog sustava Republike Hrvatske. Razvijeni hibridni model je uspoređen s estimatorom stanja zasnovanom na klasičnom pristupu, koji koristi samo SCADA mjerenja, kao i postojećim hibridnim estimatorima stanja. Višeslojni hibridni estimator stanja rezultira točnijom estimacijom stanja, uz poboljšanje sposobnosti filtriranja pogrešaka u skupu mjerenja te konvergencije proračuna.

Abstract (english)

The developed multilayer hybrid state estimator in the static and the dynamic formulation utilizes conventional Supervisory Control And Data Acquisition (SCADA) measurements and synchronized phasor measurements. The linear state estimator in the first layer of the static formulation uses only the synchronized phasor measurements of voltages and currents, while its state vector comprises buses observable by the deployed PMUs, i.e. buses equipped with the PMUs and their adjacent buses. The results of the first layer estimator are transformed from rectangular to polar coordinates and are used as pseudo-measurements together with the SCADA measurements in the second layer state estimator. Here the iterative Weighted Least Squares (WLS) method with equality constraints for zero injections is applied. In addition, the result of the first layer state estimator is used to obtain an initial guess for the second layer state estimator, in order to start the iterative process closer to the final solution, and thus to improve its convergence. The dynamic formulation utilized high sampling frequency of the synchronized phasor measurements, which are available between two runs of the state estimator in the second layer. The estimator was tested using the IEEE 14, 57 and 118 buses test systems. As an example of the real power system, the Croatian transmission power system model was used, with actual locations of SCADA and PMU measurements. The multilayer hybrid state estimator offers the enhanced estimation accuracy as well as the improved filtering and convergence capabilities.

• Keywords: hibridni estimator stanja; jedinica za sinkronizirano mjerenje fazora (PMU); estimacija stanja elektroenergetskog sustava; sinkronizirana mjerenja fazora; sistemski nadzor; zaštita i upravljanje (WAMPAC)
• Keywords (english): hybrid power system state estimator; Phasor Measurement Unit (PMU); power system state estimation; synchronized phasor measurements; Wide Area Monitoring; Protection and Control (WAMPAC)
• Language: croatian
• URN:NBN: urn:nbn:hr:168:957034
• 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=41319
• Type of resource: Text
• Extent: 187 str ; 30 cm
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-11-29 12:10:21