Small signal mode damping mitigation using orthogonal polynomials

Barrie L. Kokanos, George G. Karady

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Many on-line and off-line methods have been advanced by researchers for identifying small signal modes in power systems. Identification methods employed off-line can also be used outside of the traditional on-line prediction scenarios. These methods can assist in the design of damping mitigation devices for critical small signal mode events. In this paper, several scenarios will be studied to determine the present level of damping for small signal disturbances. Next, a damping mitigation device will be added and tuned to improve damping performance. A recently proposed orthogonal polynomial algorithm will be used to estimate the damping improvement from the mitigating devices. Frequencies and their associated damping levels in the pre- and post-mitigation cases will be identified using this new method along with a Prony assessment. Several examples will show the flexibility of this new estimation method as a design tool for tuning damping devices.

Original languageEnglish (US)
Title of host publicationIEEE PES General Meeting, PES 2010
StatePublished - Dec 6 2010
EventIEEE PES General Meeting, PES 2010 - Minneapolis, MN, United States
Duration: Jul 25 2010Jul 29 2010

Publication series

NameIEEE PES General Meeting, PES 2010


OtherIEEE PES General Meeting, PES 2010
Country/TerritoryUnited States
CityMinneapolis, MN


  • Associate Hermite expansion
  • Control design
  • Curve fitting
  • Power system stabilizers
  • Power systems
  • Prony's method
  • Small signal stability
  • Static var compensators

ASJC Scopus subject areas

  • Energy Engineering and Power Technology


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