A Mid-Term DSO Market for Capacity Limits: How to Estimate Opportunity Costs of Aggregators?

Charalampos Ziras, Jalal Kazempour, Emre Can Kara, Henrik W. Bindner, Pierre Pinson, Sila Kiliccote

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    Abstract

    A large number of mechanisms are proposed to manage potential problems in distribution networks caused by the participation of distributed energy resources (DERs) in the wholesale markets. In this paper, we first introduce a practical and straightforward mechanism, based on capacity limits, which avoids conflicts between the transmission system operator and the distribution system operators (DSOs). Using a large number of real electric vehicle (EV) commercial charging stations we
    then show how an EV aggregator can forecast the opportunity cost incurred by offering a mid-term capacity limit service to the DSO. This cost is computed based on the estimated profit that the aggregator could gain in the day-ahead and real-time markets. The proposed methodology guarantees robustness against evolving EV uncertainty, both in terms of service delivery and driving requirements. It also allows the use of a variety of timeseries forecasting methods without forecasting electricity prices and EV scenarios. The results of our empirical analysis show the exponential increase of opportunity cost and the considerable increase of the prediction intervals as the capacity limit decreases. The produced offering curves can be used as an indication of the underutilization cost of DERs caused by the DSO’s limitations.
    Original languageEnglish
    JournalIEEE Transactions on Smart Grid
    Volume11
    Issue number1
    Pages (from-to)334 - 345
    ISSN1949-3053
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Aggregator
    • Capacity limit
    • DSO service
    • Electric vehicles
    • Offering curve
    • Opportunity Cost

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