Stabilization of grid frequency through dynamic demand control

Joe A. Short, David G. Infield, Leon L. Freris

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Frequency stability in electricity networks is essential to the maintenance of supply quality and security. This paper investigates whether a degree of built-in frequency stability could be provided by incorporating dynamic demand control into certain consumer appliances. Such devices would monitor system frequency (a universally available indicator of supply-demand imbalance) and switch the appliance on or off accordingly, striking a compromise between the needs of the appliance and the grid. A simplified computer model of a power grid was created incorporating aggregate generator inertia, governor action and load-frequency dependence plus refrigerators with dynamic demand controllers. Simulation modelling studies were carried out to investigate the system's response to a sudden loss of generation, and to fluctuating wind power. The studies indicated a significant delay in frequency-fall and a reduced dependence on rapidly deployable backup generation.
Original languageEnglish
Pages (from-to)1284-1293
Number of pages10
JournalIEEE Transactions on Power Systems
Issue number3
Early online date30 Jul 2007
Publication statusPublished - 31 Aug 2007


  • electricity networks
  • electricity supply
  • consumer electricity supply
  • electricity supply stability

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