Estimation of Power System Inertia from Electromechanical Modes

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


The inertia of many power systems is expected to decrease as more wind and solar power is introduced. With low inertia, a need to estimate it arises. The estimation method should preferably work during normal operation, in order to ensure that the grid frequency can be maintained during any sudden disturbance. This study proposes a new method for inertia estimation, based on electromechanical modes. The method consists of two steps, the first being estimation of modes, which is done from normal frequency variations, and the second being estimation of the inertia from the modes, which is done using a model of the system. The rigid body mode, in which all machines in the system participate, and inter-area and other inter-generator modes are all possible to use. The method was applied to simulated systems with results indicating that it is potentially useful for inertia estimation.


External organisations
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • frequency dynamics, frequency stability, Inertia, mode estimation, rigid body mode
Original languageEnglish
Title of host publication2020 55th International Universities Power Engineering Conference (UPEC)
Subtitle of host publicationVerifying the Targets
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728110783
Publication statusPublished - 2020 Sep
Publication categoryResearch
Event55th International Universities Power Engineering Conference, UPEC 2020 - Virtual, Torino, Italy
Duration: 2020 Sep 12020 Sep 4


Conference55th International Universities Power Engineering Conference, UPEC 2020
CityVirtual, Torino