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Author:Rauma, Kalle
Title:Electrical Resonances and Harmonics in a Wind Power Plant
Resonancias eléctricas y armónicos en un parque eólico
Sähköiset resonanssit ja harmoniset yliaallot tuulipuistossa
Publication type:Master's thesis
Publication year:2012
Pages:ix + 77 s. + liitt. 4      Language:   eng
Department/School:Sähkötekniikan laitos
Main subject:Sähköverkot ja suurjännitetekniikka   (S-18)
Supervisor:Haarla, Liisa
Instructor:Rodríguez, Pedro
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201209213129
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto  1303   | Archive
Keywords:resonance
wind power plant
harmonic resonance mode analysis
modal analysis
harmonics
power quality
resonanssi
tuulipuisto
moodianalyysi
harmoniset yliaallot
sähkönlaatu
Abstract (eng): Modern power networks have a growing number of power electronic devices, some of which can be seen as sources of harmonic currents.
Moreover, the electric grids have numerous inductive and capacitive elements forming ideal conditions for harmonic resonances.
These resonances, however, are a severe threat to power quality and the function of power systems.
For this reason, the resonance analysis is an emerging topic in the field of power systems.

In the current study, two analytical methods are used: a frequency scan and harmonic resonance mode analysis.
Although the former method is well-known, the latter method is relatively new.
The mathematical bases of these two methods are introduced in the theoretical section and then applied in the simulations of an aggregated model of an off shore wind power plant.

The work has two principal objectives: to determine the main reasons for harmonic resonances in a wind power plant and to investigate the applicability of the harmonic resonance mode analysis to analyse the resonances.

In addition to establishing the resonating elements in a wind power plant, the results reveal the harmonic resonance mode analysis to be a plausible tool for the systematic resonance analysis of power networks.
The thesis offers new aspects of developing the modal approach to the resonance studies are provided.
Abstract (fin): Nykyaikaisiin sähköverkkoihin asennetaan kasvavin määrin erilaisia tehoelektroniikkalaitteita, joista osa voidaan luokitella harmonisiksi yliaaltovirtalähteiksi.
Tilannetta vakavoittaa se, että sähköverkot sisältävät paljon induktiivisia ja kapasitiivisia osia, jotka luovat pohjan harmonisten yliaaltojen resonansseille.
Resonanssit voivat olla uhka sekä sähkönlaadulle että koko sähköverkkojen toiminnalle.

Sen lisäksi, että resonanssit on lasketaan perinteisellä taajuusskannausmenetelmällä (frequency scan), työssä käytetään myös uudempaa moodianalyysiin perustuvaa menetelmää (harmonic mode resonance analysis) harmonisten resonanssien tutkimiseen.
Teoreettinen osa esittelee näiden kahden menetelmän matemaattisen perustan ja työn soveltavassa näitä menetelmiä sovelletaan agregoidun merituulipuiston laskentamalliin.

Sen lisäksi, että tulokset esittelevät syitä harmonisiin yliaaltoresonansseihin tuulipuistossa, ne korostavat moodianalyysimenetelmän mahdollisuuksia sähköverkkojen resonanssien laskemisessa.
Tulokset tuovat myös uusia näkökulmia moodianalyysin jatkokehittämiseen resonanssianalyysissa.
ED:2012-04-24
INSSI record number: 44275
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