Cost-Optimal ATCs in Zonal Electricity Markets

Tue Vissing Jensen*, Jalal Kazempour, Pierre Pinson

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In contrast to existing frameworks for AvailableTransfer Capacity (ATC) determination, we propose to define ATCs in an integrated and data-driven manner, optimizing for expected operational costs of the whole system to derive cost-optimal ATCs. These ATCs are purely financial parameters, separate from the physical ATCs based on security indices only typically used in zonal electricity markets today. Determining cost-optimal ATCs requires viewing ATCs as an endogenous market construct, and leads naturally to the definition of a market entity whose responsibility is to optimize ATCs. The optimization problem which this entity solves is a stochastic bilevel problem, which we decompose to yield a computationally tractable formulation. We show that cost-optimal ATCs depend non-trivially on the underlying network structure, and the problem of finding a setof cost-optimal ATCs is in general non-convex. On a European scaletest system, cost-optimal ATCs achieve expected total costs midway between those for non-integrated ATCs and a fully stochastic nodal setup. This benefit comes from qualitatively different ATCs compared to typical definitions, with ATCs which exceed the physical cross-border capacity by a factor of 2 or more, and ATCs which are zero between well-connected areas.Our results indicate that the perceived efficiency gap between zonal and nodal markets may be exagerrated if non-optimal ATCs are used.
Original languageEnglish
JournalI E E E Transactions on Power Systems
Volume33
Issue number4
Pages (from-to)3624-3633
ISSN0885-8950
DOIs
Publication statusPublished - 2018

Keywords

  • Zonal Electricity
  • Markets
  • Market coupling
  • Available Transfer Capacity
  • Bilevel programming

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