On-line power system inertia calculation using wide area measurements

M. Sun, Y. Feng, P. Wall, S. Azizi, J. Yu, V. Terzija

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Future developments in power systems, e.g. relatively larger generator sets, the virtual power plant and synthetic inertia concept and connection of generation assets over inverters, will cause the system inertia to vary significantly. During system operation, if the inertia of the system is significantly lower than anticipated at the planning stage, then the existing, deterministic protection and control may fail to ensure system stability. Therefore, the ability to accurately determine the inertia of individual system areas, and the system as a whole, online would be very useful. In this paper, an Inertia Calculation Application (ICA), which could be implemented as part of a Wide Area Monitoring Protection and Control scheme, is presented. The necessary wide area measurements must be processed during large disturbances to the active power balance of the system. The ICA has been validated by using computer simulations, under laboratory conditions and by using real-life data recorded by a transmission system operator.

Original languageEnglish
Pages (from-to)325-331
Number of pages7
JournalInternational Journal of Electrical Power and Energy Systems
Publication statusPublished - Jul 2019
Externally publishedYes


  • Electro-mechanical transient processes
  • Frequency
  • Inertia
  • Nonlinear estimation
  • Power system measurement
  • Power system transients
  • Swing equation
  • Testing


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