Your browser does not support JavaScript!

Generator coherency and area detection in large power systems

Generator coherency and area detection in large power systems

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Generation, Transmission & Distribution — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This study provides a new general approach for defining coherent generators in power systems based on the coherency in low-frequency inter-area modes. The disturbance is considered to be distributed in the network by applying random load changes which is the random walk representation of real loads instead of a single fault and coherent generators are obtained by spectrum analysis of the generators velocity variations. In order to find the coherent areas and their borders in the inter-connected networks, non-generating buses are assigned to each group of coherent generator using similar coherency detection techniques. The method is evaluated on two test systems and coherent generators and areas are obtained for different operating points to provide a more accurate grouping approach which is valid across a range of realistic operating points of the system.


    1. 1)
    2. 2)
    3. 3)
    4. 4)
    5. 5)
    6. 6)
      • S.M. Kay . (1988) Modern spectral estimation.
    7. 7)
      • G. Rogers . (2000) Power system oscillations.
    8. 8)
    9. 9)
    10. 10)
    11. 11)
    12. 12)
    13. 13)
    14. 14)
      • J.H. Chow . (1982) Time-scale modeling of dynamic networks with applications to power systems.
    15. 15)
    16. 16)
    17. 17)
    18. 18)
      • Alsafih, H.A., Dunn, R.: `Determination of coherent clusters in a multi-machine power system based on wide-area signal measurements', IEEE Power and Energy Society General Meeting, July 2010, Minneapolis, USA, p. 1–8.
    19. 19)
      • Ledwich, G., Palmer, E.: `Modal estimates from normal operation of power systems', IEEE Power Engineering Society Winter Meeting, January 2000, p. 1527–1531.

Related content

This is a required field
Please enter a valid email address