Integrated Power and Natural Gas Model for Energy Adequacy in Short-Term Operation

TLDR

The rapid expansion of gas‑fired units has heightened the interdependency between power and natural gas networks, requiring the gas system to provide increased flexibility and reliability during peak demand and renewable intermittency. The study proposes a novel MILP formulation that couples power and gas networks while accounting for gas traveling velocity and compressibility. The authors formulate a MILP that couples power and gas networks, incorporating gas traveling velocity and compressibility, and validate it with case studies on the IEEE 24‑bus system and the Belgian high‑calorific gas network. The model ensures gas adequacy to maintain short‑term power system reliability and guarantees global optimality within predefined tolerances.

Abstract

The significant growth in gas-fired units worldwide has increased the grade of interdependency between power and natural gas networks. Since these units are usually required to ramp up during the peak and backup intermittent renewable generation and contingencies, the power system tends to demand more flexibility and reliability from the gas system. This paper contributes with a novel mixed-integer linear programming (MILP) formulation that couples power and gas networks taking into account the gas traveling velocity and compressibility. As a result, the model accounts for the gas adequacy needed to assure the power system reliability in the short term. The robustness of the MILP formulation allows guaranteeing global optimality within predefined tolerances. Case studies integrate the IEEE 24-bus system and Belgian high-calorific gas network for validating the formulation.