Estimation of generator inertia available during a disturbance

Peter Wall, Francisco Gonzalez-Longatt, Vladimir Terzija

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

70 Citations (Scopus)


The inertia of a power system is a key factor in determining the initial frequency decline after a disturbance. Low system inertia can allow large frequency declines to occur that could lead to violation of frequency security limits, particularly in smaller power systems, or play a key role in allowing cascading outages to occur. Future developments in power systems will mean that the system inertia will become highly variable and take values that would traditionally have been considered very low. Presented is a method for the robust estimation of the generator inertia available in the system during a disturbance. This method has been validated using simulations of the IEEE 39-bus system in DIgSILENTTM PowerFactory®. Inertia estimates for a variety of disturbance types and noise conditions have been made, and found to have a median error of 1.53% with inter-quartile range of 6.6%.

Original languageEnglish
Title of host publication2012 IEEE Power and Energy Society General Meeting, PES 2012
Publication statusPublished - 2012
Externally publishedYes
Event2012 IEEE Power and Energy Society General Meeting, PES 2012 - San Diego, CA, United States
Duration: 22 Jul 201226 Jul 2012

Publication series

NameIEEE Power and Energy Society General Meeting
ISSN (Print)1944-9925
ISSN (Electronic)1944-9933


Conference2012 IEEE Power and Energy Society General Meeting, PES 2012
Country/TerritoryUnited States
CitySan Diego, CA


  • Generator Inertia
  • Inertia Estimation
  • Power system dynamics
  • Power system simulation
  • Smart grids


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