Conic Optimal Energy Flow of Integrated Electricity and Natural Gas Systems

Abstract

In this letter, we propose a market-based bi-level conic optimal energy flow (OEF) model of integrated electricity and natural gas systems (IENGS). Conic AC optimal power flow (ACOPF) is formulated in the upper level model, and the generation cost of natural gas fired generation units (NGFGUs) is calculated based on natural gas locational marginal prices (NG-LMPs). The natural gas system market clearing process is modeled in the lower level model. The bi-level model is then transferred into a mixed-integer second-order cone programming (MISOCP) problem. Simulation results demonstrate the effectiveness of the proposed conic OEF model.