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Methods for Monitoring Electromechanical Oscillations in Power Systems

by Janne Seppnen

Institution: Aalto University
Year: 2017
Posted: 02/01/2018
Record ID: 2197348
Full text PDF: https://aaltodoc.aalto.fi/handle/123456789/26856


Abstract

Electromechanical oscillations are an inherent property of power systems and the damping of the oscillations is the limiting factor for the transmission capacity of certain transmission corridors. In the most severe situations, unstable oscillations may lead to blackouts. Thus, it is important to monitor the characteristics of the oscillations.The oscillations can be monitored for example by using phasor measurement units (PMU). The development of wide area monitoring systems (WAMS) consisting of several PMUs has enabled the use of multiple synchronized measurement signals received from several locations in the power system to be used for the monitoring and analysis of the oscillatory modes.This thesis presents four new multivariate methods (i.e. use several measurements from different locations of the grid) for the monitoring of the electromechanical modes. The methods are able to continuously identify electromechanical modes using ambient oscillations, which are mainly excited by load variations and are constantly present in power systems. The performance, characteristics and limitations of the methods are studied using simulated data as well as real measured data. This thesis also presents comparisons of different modal identification methods and illustrates additional analysis tools that can be used to support the modal identification in real power systems.This thesis shows that the proposed methods are functional for monitoring of electromechanical modes. Due to certain limitations in modal identification methods, the thesis also highlights the need of using additional tools, such as spectral analyses, which may significantly help the interpretation of modal identification results. The methods presented in this thesis can be used as building blocks for transmission system operators (TSO) to create functional applications for real-time and offline modal analysis of power systems. Consequently, the information given by the methods may be used to improve the security and reliability of power systems.; Shkmekaanista heilahtelua esiintyy shkvoimajrjestelmiss jatkuvasti. Joissain voimajrjestelmiss shkmekaanisen heilahtelun vaimennus rajoittaa verkon siirtokapasiteettia ja pahimmissa tapauksissa vaimenematon heilahtelu voi aiheuttaa laajoja shkkatkoja. Mm. nist syist johtuen on trke valvoa shkmekaanista heilahtelua shknsiirtoverkoissa.Heilahtelua voidaan valvoa hydynten osoitinmittalaitteita (phasor measurement unit, PMU). Useista PMU:ista koostuvien laajan alueen valvontajrjestelmien (wide area monitoring systems, WAMS) kehittymisen myt shkmekaanisten heilahtelumoodien valvonnassa ja identifioinnissa voidaan hydynt useita synkronoituja mittauksia.Tss vitskirjassa esitetn nelj uutta monimuuttujamenetelm, jotka on tarkoitettu shkmekaanisten heilahtelumoodien identifiointiin ja jatkuvaan valvontaan. Esitettvt menetelmt hydyntvt WAMS-mittauksia useasta eri paikasta shkverkossa ja kyttvt moodien identifiointiin verkossa esiintyv jatkuvaa heilahtelua, jonkaAdvisors/Committee Members: Haarla, Liisa, Dr., Fingrid, Finland (advisor), Turunen, Jukka, Dr., Fingrid, Finland (advisor).

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