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The increase of electric demand and the progressive integration of renewablesources threatens the stability of the power grid. To solve this issue, severalmethods have been proposed to control the demand side instead of increasing thespinning reserve on the supply side. Here we focus on dynamic demand control(DDC), a method in which appliances can delay its scheduled operation if theelectric frequency is outside a suitable range. We have recently shown that DDCeffectively reduces small and medium-size frequency fluctuations but, due tothe need of recovering pending tasks, the probability of large demand peaks,and hence large frequency fluctuations, may actually increase. Although theseevents are very rare they can potentially trigger a failure of the system andtherefore strategies to avoid them have to be addressed. In this work, weintroduce a new method including communication among DDC devices belonging to agiven group, such that they can coordinate opposite actions to keep the groupdemand more stable. We show that for this method the amount of pending tasksdecreases by a factor 10 while large frequency fluctuations are significantlyreduced or even completely avoided.

Reduction of power grid fluctuations by communication between smart devices