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Real-time Flexibility Feedback for Closed-loop Aggregator and System Operator Coordination

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Document pages: 14 pages

Abstract: Aggregators have emerged as crucial tools for the coordination ofdistributed, controllable loads. However, to be used effectively, aggregatorsmust be able to communicate the available flexibility of the loads they controlto the system operator in a manner that is both (i) concise enough to bescalable to aggregators governing hundreds or even thousands of loads and (ii)informative enough to allow the system operator to send control signals to theaggregator that lead to optimization of system-level objectives, such as costminimization, and do not violate private constraints of the loads, such assatisfying specific load demands. In this paper, we present the design of areal-time flexibility feedback signal based on maximization of entropy. Thedesign provides a concise and informative signal that can be used by the systemoperator to perform online cost minimization and real-time capacity estimation,while provably satisfying the private constraints of the loads. In addition toderiving analytic properties of the design, we illustrate the effectiveness ofthe design using a dataset from an adaptive electric vehicle charging network.

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