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Frequency Stability Analysis of the Nordic Power Systemwith New Hydropower Governor Settings
KTH, School of Electrical Engineering (EES), Electric Power Systems.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Nordic power system is under continuous development. New productionsources and loads are installed at a high rate and old ones are taken out of operation.This development gradually alters the power system dynamics. The NordicTransmission System Operators (TSOs) have observed that the frequency qualityis gradually decreasing and recognized a number of reasons for this. Theautomatic frequency containment reserve (FCR-N) is in place to keep the electricfrequency within the interval 50 +/- 0.1 Hz during normal operation. Thisfunction is mainly provided by a number of hydropower plants where the turbinegovernor is set to control the discharge in proportion to the measured frequencydeviation. In later years it has been shown that the disturbance damping is verylow in an interval around 1/60 Hz and it is believed that proper tuning of theturbine governors that provide FCR-N can help mitigating this problem. Newregulator settings have been suggested in a recent study performed at Vattenfalland Uppsala University to improve the performance of the FCR-N, yet keepingthe system robust and the wear on participating units at a minimum. It is nowdesired to investigate the possible eects of new governor settings on the overallpower system stability.

This thesis work consists of three main parts. First of all, a reduced Nordicpower system model is constructed in Simpow and validated with PMU datafrom the TSO. Secondly, the frequency responses with the newly suggestedgovernor settings have been investigated when introducing a disturbance into thesystem. Thirdly, the eects of the new governor settings on electro-mechanicaloscillations are investigated. In a word, the overall performance for new governorsettings are tested in a large scale power system model in this thesis work.

Abstract [sv]

Det nordiska kraftsystemet ar under standig forandring. Nya produktionskalloroch laster ansluts och gamla tas ur bruk. Detta paverkar gradvis kraftsystemetsdynamik. De nordiska systemoperatorerna (TSOerna) har erfarit att frekvenskvalitetengradvis forsamras, och att det kan nnas era orsaker till detta.Den automatiska primarregleringsreserven (FCR-N) ska halla frekvensen inomintervallet 50 +/-0,1 Hz under normaldrift. Reserven levereras av ett stort antalvattenkraftverk, dar turbinregulatorn reglerar vattenodet genom turbinen proportionelltmot den uppmatta frekvensavvikelsen. Pasenarear har man kunnatvisa att dampningen av storningar med periodtider runt 60 sekunder ar dalig,och man tror att problemet skulle kunna avhjalpas med battre intrimning avturbinregulatorparametrarna. En studie utford pa Vattenfall och Uppsala Universitethar tagit fram ett forslag panya turbinregulatorinstallningar som skaforbattra prestandan i regleringen utan att forsamra systemets robusthet elleroka slitaget pavattenkraftaggregaten. Nu vill man undersoka om de foreslagnainstallningarna kan ha nagon negativ inverkan pakraftsystemets stabilitet.

Det har examensarbetet bestar av tre delar. I den forsta delen satts en reduceradmodell av det nordiska elnatet upp i programmet Simpow, och en validering avmodellen gors med hjalp av PMU-data. I den andra delen undersoks frekvenssvaretfran den nya modellen med de foreslagna turbinregulatorinstallningarna. I den tredje delen undersoks de nya turbinregulatorinstallningarnas inverkanpasystemets elektromekaniska oscillationer. Med andra ord satestas i dettaexamensarbete nya turbinregulatorinstallningar i en detaljerad och storskaligkraftsystemmodell.

Place, publisher, year, edition, pages
2015. , 58 p.
Series
EES Examensarbete / Master Thesis, TRITA EE 2015:93
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-179143OAI: oai:DiVA.org:kth-179143DiVA: diva2:881488
Examiners
Available from: 2015-12-10 Created: 2015-12-10 Last updated: 2015-12-10Bibliographically approved

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