Distributed Automatic Load-Frequency Control with Optimality in Power Systems: Preprint

Changhong Zhao, Xin Chen, Na Li

Research output: Contribution to conferencePaper


With increasing penetrations of renewable energy resources, power systems face new challenges in balancing supply and demand and maintaining nominal frequency. This paper studies load control to handle these challenges. In particular, a fully distributed automatic load control algorithm, which needs only local measurement and local communications, is proposed. We prove that the control algorithm globally converges to an optimal operating point that minimizes the total disutility of users, restores the nominal frequency and the scheduled tie-line power flows, and respects the thermal constraints of transmission lines. We also show that the convergence holds even when inaccurate system parameters are used in the control algorithm. Last, the effectiveness, optimality, and robustness of the proposed algorithm are demonstrated via numerical simulations.
Original languageAmerican English
Number of pages10
StatePublished - 2018
EventIEEE Conference on Control Technology and Applications - Copenhagen, Denmark
Duration: 21 Aug 201824 Aug 2018


ConferenceIEEE Conference on Control Technology and Applications
CityCopenhagen, Denmark

Bibliographical note

See NREL/CP-5D00-72928 for paper as published in IEEE proceedings

NREL Publication Number

  • NREL/CP-5D00-71123


  • distributed generation
  • frequency
  • load control
  • optimality
  • power systems


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