The impact of time delay on robust control design in power systems

Hongxia Wu, Hui Ni, Gerald Thomas Heydt

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

108 Scopus citations


A centralized wide area controller design using system-wide data is proposed to enhance the dynamic performance of a large power system. The time delay exists in the data communication for this controller. Long time delay may be a detriment to wide area control system stability and delay may degrade system robustness. This paper analyzes the impact of time delay on robust wide area controller design in power systems. Time delay is described using the Padé approximation and is simulated within the robust wide area control system. According to numerous simulations, it is found that the overshoot value of active power variation increases and the settling time is lengthened when time delay occurs. The closed-loop control system may become unstable when the time delay is over a certain value. A robust controller can be redesigned to accommodate the possible long time delay. The impact of time delay on robust controller design is studied using a two-area four-machine system.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE Power Engineering Society Transmission and Distribution Conference
Number of pages6
StatePublished - 2002
Event2002 IEEE Power Engineering Society Winter Meeting - New York, NY, United States
Duration: Jan 27 2002Jan 31 2002


Other2002 IEEE Power Engineering Society Winter Meeting
Country/TerritoryUnited States
CityNew York, NY


  • Linear Matrix Inequality
  • Padé approximation
  • Power system stabilizer
  • Robust control
  • Time delay
  • Wide area control

ASJC Scopus subject areas

  • Energy(all)
  • Engineering(all)


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