Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
On the rotor angle stability of power systems with Doubly Fed Induction Generators
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-6431-9104
2007 (English)In: 2007 IEEE LAUSANNE POWERTECH, VOLS 1-5, NEW YORK: IEEE , 2007, 213-218 p.Conference paper, Published paper (Refereed)
Abstract [en]

This article is concerned with the impact of large scale wind farms utilising doubly fed induction generators on the stability of a traditional thermal power system. Inspection of the eigenstructure of the power system provides a foundation for assessment of the impact, which is then quantifted by means of detailed numerical simulations. Simplified state-space models are used to describe the dynamics of the generators in a very simple system., whose network is described by algebraic relations. A third order model is derived for a doubly fed induction generator. Mathematical models are used to identify the behavioural patterns of the system when it is subject to disturbances. Eigenvalue analysis reveals certain interesting properties of the system when it is subject to small disturbances. Numerical simulations show that the addition to a power system of doubly fed induction generators, such as those found in wind farms, improves the response of the system to small disturbances, but can have an adverse impact after larger disturbances.

Place, publisher, year, edition, pages
NEW YORK: IEEE , 2007. 213-218 p.
Keyword [en]
DFIG, doubly fed induction generator, stability, power system, one-axis model, third order, eigenvalues
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-36828DOI: 10.1109/PCT.2007.4538319ISI: 000258730100038Scopus ID: 2-s2.0-50849101958OAI: oai:DiVA.org:kth-36828DiVA: diva2:431233
Conference
IEEE Lausanne Powertech Lausanne, SWITZERLAND, JUL 01-05, 2007
Note
QC 20110718Available from: 2011-07-18 Created: 2011-07-15 Last updated: 2012-04-19Bibliographically approved
In thesis
1. The Dynamic Impact of Large Wind Farms on Power System Stability
Open this publication in new window or tab >>The Dynamic Impact of Large Wind Farms on Power System Stability
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As the installed capacity of wind power increases across the world, its impact on power systems is becoming more important. To ensure the reliable operation of a power system which is significantly fed by wind power, the dynamics of the system must be understood. The purpose of this study is to analyse the dynamic impact of large-scale wind farms on the stability of a power grid, and to investigate the possibility of improving the stabilisation and damping of the grid by smart control strategies for wind turbines.

When unconventional types of generators are used in a power system, the system behaves differently under abnormal dynamic events. For example, new types of generators such as doubly fed induction generators (DFIGs) cause different modes of oscillation in the system. In order to damp oscillations in the system, it is necessary to understand the equipment causing these oscillations, and the methods of optimally damping the oscillations.

Large power oscillations can occur in a power system as a result of disturbances. Ordinarily these oscillations are slow and, in principle, it is possible to damp them with the help of wind power. This suggests the use of a power oscillation damping (POD) controller for a DFIG, similar to a power system stabiliser (PSS) for a synchronous generator. To demonstrate this concept, we design PODs for DFIGs in a wind farm.

Voltage stability is another important aspect of the safe operation of a power system. It has been shown that the voltage stability of a power system is affected by induction generators and also DFIGs. The voltage stability must therefore also be analysed in order to guard against a power system collapse.

In this study we develop models and control strategies for large wind farms comprising DFIGs, and study the impact of the wind farms on power systems. The design of multiple PODs in a wind farm is performed using linear matrix inequalities (LMIs), and the impact of the wind turbines is investigated through the use of linear and dynamic simulations. It has been demonstrated that DFIGs can be used for damping oscillations, and that they can also improve the critical clearing time of some faults. However, they may have an adverse impact on power systems after large voltage disturbances.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. viii, 63 p.
Series
Trita-EE, ISSN 1653-5146 ; 2012:016
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-93220 (URN)978-91-7501-316-9 (ISBN)
Public defence
2012-05-03, sal H1, Teknikringen 33, KTH, Stockholm, 10:30 (English)
Opponent
Supervisors
Note
QC 20120419Available from: 2012-04-19 Created: 2012-04-12 Last updated: 2012-04-19Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Ghandhari, Mehrdad

Search in DiVA

By author/editor
Elkington, KatherineKnazkins, ValerijsGhandhari, Mehrdad
By organisation
Electric Power Systems
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 207 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf