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Distributed Power Apportioning with Early Dispatch for Ancillary Services in Renewable Grids

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Document pages: 9 pages

Abstract: This article develops a distributed framework for coordinating distributedenergy resources (DERs) in a power network to provide secondary frequencyresponse (SFR) as an ancillary service to the bulk power system. A distributedfinite-time protocol-based solution is adopted that allows each DER in thenetwork to determine power reference commands. The distributed protocolrespects information exchange constraints posed by a communication networklayer while being robust to delays in the communications channels. The proposedframework enables coordinated response and control of the aggregated DERs byapportioning the share of generation that each DER needs to provide towardsmeeting any specified global SFR command while allowing for adjustments due tovariability in generation and demand in order to prioritize renewable energysources in the network. A novel early dispatch mechanism with brown start issynthesized to achieve initial DER response to changing SFR commands that isfaster than state-of-the-art distributed approaches. The proposed powerapportioning protocol is validated using an end-to-end powerhardware-in-the-loop configuration at a distribution system scale with 40+physical hardware DERs, underlying 7-MW power system model, a 250-DERcommunication topology with physical and simulated distributed controllernodes, varied communication protocols, and an underlying real-world powersystem model. Experimental results demonstrate the efficacy of the proposedmethod toward distributed coordination of hundreds of DERs for providing fastresponse at SFR timescales.

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