Deciding Feasibility of a Booking in the European Gas Market on a Cycle is in P

Martine Labbé 1 Fränk Plein 2, 3 Martin Schmidt 4 Johannes Thürauf 5
1 INOCS - Integrated Optimization with Complex Structure
ULB - Université Libre de Bruxelles [Bruxelles], Inria Lille - Nord Europe, CRIStAL - Centre de Recherche en Informatique, Signal et Automatique de Lille (CRIStAL) - UMR 9189
Abstract : We show that the feasibility of a booking in the European entry-exit gas market can be decided in polynomial time on single-cycle networks. The feasibility of a booking can be characterized by solving polynomially many nonlinear potential-based flow models for computing so-called potential-difference maximizing load flow scenarios. We thus analyze the structure of these models and exploit both the cyclic graph structure as well as specific properties of potential-based flows. This enables us to solve the decision variant of the nonlinear potential-difference maximization by reducing it to a system of polynomials of constant dimension that is independent of the cycle's size. This system of fixed dimension can be handled with tools from real algebraic geometry to derive a polynomial-time algorithm. The characterization in terms of potential-difference maximizing load flow scenarios then leads to a polynomial-time algorithm for deciding the feasibility of a booking. Our theoretical results extend the existing knowledge about the complexity of deciding the feasibility of bookings from trees to single-cycle networks.
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Martine Labbé, Fränk Plein, Martin Schmidt, Johannes Thürauf. Deciding Feasibility of a Booking in the European Gas Market on a Cycle is in P. 2019. ⟨hal-02360972⟩

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