Congestion Management in Distribution Networks With Asymmetric Block Offers

Alexander Niels August Hermann*, Jalal Kazempour, Shaojun Huang, Jacob Østergaard

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In current practice, the day-ahead market-clearing outcomes are not necessarily feasible for distribution networks, i.e, the network constraints might not be satisfied. Hence, the distribution system operator may consider an ex-post re-dispatch mechanism, exploiting potential flexibility of local distributed energy resources (DERs) including demand response (DR) units. Many DR units have an inherent "rebound effect", meaning a decrease in power demand (response) must be followed by an increase (rebound) or vice-versa, due to their underlying physical properties. A naive re-dispatch mechanism relying on DR units with non-negligible rebound effect may fail, since those units may cause another congestion in the rebound period. We propose a mechanism, which models the rebound effect of DR units using asymmetric block offers — this way, those units offer their flexibility using two subsequent blocks (response and rebound), each one representing the load decrease/increase in a time period. We demonstrate that though linear approximations of optimal power flow (OPF) models as potential re-dispatch mechanisms are more computationally efficient, they can result in a different dispatch of the asymmetric blocks than an exact convex relaxation of an AC-OPF model, and therefore, must be used with caution
Original languageEnglish
JournalI E E E Transactions on Power Systems
Volume34
Issue number6
Pages (from-to)4382-4392
Number of pages11
ISSN0885-8950
DOIs
Publication statusPublished - 2019

Keywords

  • Congestion management
  • Demand response
  • Rebound effect
  • Asymmetric block offers
  • Convex relaxation

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