Linear quadratic regulator controller to improve transient frequency stability through virtual inertia

Andre Luna, Ujjwol Tamrakar, Reinaldo Tonkoski, Steven Hietpas

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

5 Scopus citations

Abstract

The increased penetration of photovoltaics (PV) and wind energy resources has raised awareness to the maintenance of the future grid's stability and reliability. One emerging issue is the susceptibility to frequency instability when facing substantial generation-load imbalances due to decrease in rotational inertia of the grid. As a possible solution for frequency instability issues, virtual inertia (VI) is implemented using energy storage systems (ESSs). It is shown that, through a Linear Quadratic Regulator (LQR) controller, frequency change and the rate of change of frequency (ROCOF) of a system are optimally reduced. The designed LQR controller is further tested for the system with decreased inertia and it is able to maintain frequency change for up to 90% of decreased inertia and ROCOF only for up to 10% within the standards. The ROCOF was found to be more sensitive to decreased inertia than change in frequency, which suggests the use of an adaptive controller, instead of a fixed gain LQR controller, in the presence of significant parametric changes.

Original languageEnglish
Title of host publication2020 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728131030
DOIs
StatePublished - Feb 2020
Externally publishedYes
Event2020 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2020 - Washington, United States
Duration: 17 Feb 202020 Feb 2020

Publication series

Name2020 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2020

Conference

Conference2020 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2020
Country/TerritoryUnited States
CityWashington
Period17/02/2020/02/20

Keywords

  • Energy storage systems
  • Linear quadratic regulator
  • Renewables
  • Virtual inertia

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