Modeling Gas Flow Directions as State Variables: Does it Provide More Flexibility to Power Systems?

Junesoo Shin*, Yannick Werner, Jalal Kazempour

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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As a common practice, the direction of natural gas flow in every pipeline is determined ex-ante for simplification purposes, and treated as a given parameter within the scheduling problem. However, in integrated gas and electric power networks with a large share of intermittent renewable power supply, it is no longer straightforward to optimally predetermine the gas flow directions. A wrong predetermination of gas flow directions may result in feasible but not necessarily optimal schedules. We propose a mixed-integer linear optimization model to determine the optimal gas flow directions while scheduling the system. This unlocks additional flexibility to power systems, provided that a tight coordination between power and gas systems exists. The increased flexibility, although it comes at the cost of increased computational complexity, is quantified by comparing the total operational cost of the entire system with bidirectional gas flows as opposed to unidirectional gas flows. We numerically show that modeling gas flow directions as state variables may bring added value not only in the meshed but also in the radial gas networks.
Original languageEnglish
Article number108502
JournalElectric Power Systems Research
Number of pages9
Publication statusPublished - 2022
EventXXII Power Systems Computation Conference - University of Porto, Porto, Portugal
Duration: 27 Jun 20221 Jul 2022
Conference number: 22


ConferenceXXII Power Systems Computation Conference
LocationUniversity of Porto
Internet address


  • Integrated energy systems
  • Optimal gas flow directions
  • Flexibility
  • Linepack
  • Mixed-integer linear program


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