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Engineering Negative Cycle Canceling for Wind Farm Cabling

Authors Sascha Gritzbach , Torsten Ueckerdt , Dorothea Wagner , Franziska Wegner , Matthias Wolf



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Author Details

Sascha Gritzbach
  • Karlsruhe Institute of Technology, Germany
Torsten Ueckerdt
  • Karlsruhe Institute of Technology, Germany
Dorothea Wagner
  • Karlsruhe Institute of Technology, Germany
Franziska Wegner
  • Karlsruhe Institute of Technology, Germany
Matthias Wolf
  • Karlsruhe Institute of Technology, Germany

Acknowledgements

We thank our colleagues Lukas Barth and Marcel Radermacher for valuable discussions and Lukas Barth for providing a code interface for simultaneous MILP-solver experiments.

Cite AsGet BibTex

Sascha Gritzbach, Torsten Ueckerdt, Dorothea Wagner, Franziska Wegner, and Matthias Wolf. Engineering Negative Cycle Canceling for Wind Farm Cabling. In 27th Annual European Symposium on Algorithms (ESA 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 144, pp. 55:1-55:16, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2019)
https://doi.org/10.4230/LIPIcs.ESA.2019.55

Abstract

In a wind farm turbines convert wind energy into electrical energy. The generation of each turbine is transmitted, possibly via other turbines, to a substation that is connected to the power grid. On every possible interconnection there can be at most one of various different cable types. Each cable type comes with a cost per unit length and with a capacity. Designing a cost-minimal cable layout for a wind farm to feed all turbine production into the power grid is called the Wind Farm Cabling Problem (WCP). We consider a formulation of WCP as a flow problem on a graph where the cost of a flow on an edge is modeled by a step function originating from the cable types. Recently, we presented a proof-of-concept for a negative cycle canceling-based algorithm for WCP [Sascha Gritzbach et al., 2018]. We extend key steps of that heuristic and build a theoretical foundation that explains how this heuristic tackles the problems arising from the special structure of WCP. A thorough experimental evaluation identifies the best setup of the algorithm and compares it to existing methods from the literature such as Mixed-integer Linear Programming (MILP) and Simulated Annealing (SA). The heuristic runs in a range of half a millisecond to under two minutes on instances with up to 500 turbines. It provides solutions of similar quality compared to both competitors with running times of one hour and one day. When comparing the solution quality after a running time of two seconds, our algorithm outperforms the MILP- and SA-approaches, which allows it to be applied in interactive wind farm planning.

Subject Classification

ACM Subject Classification
  • Mathematics of computing → Network flows
  • Mathematics of computing → Graph algorithms
  • Mathematics of computing → Network optimization
Keywords
  • Negative Cycle Canceling
  • Step Cost Function
  • Wind Farm Planning

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