Low-carbon economic dispatch of integrated electricity and natural gas energy system considering carbon capture device

Abstract

The carbon capture device can catch CO₂ produced by conventional units and coupled with power-to-gas (P2G) operation provides an effective way to reduce the carbon emissions of the integrated energy system (IES). In this paper, a low-carbon economic dispatch is proposed for an integrated electricity-gas system (IEGS) considering carbon capture devices, and the carbon trading mechanism is introduced. Based on the traditional thermal power units, carbon capture devices are installed to form carbon capture power plants (CCPP). Carbon emissions are reduced from the energy supply side via capturing CO₂ generated by conventional units. Detailed modeling of IEGS, CCPP, and P2G are performed, respectively. The electricity and natural gas networks security constraints are incorporated into the low-carbon economic dispatch model to minimize carbon transaction costs and system operation costs. Finally, a 4-bus power system/4-node natural gas system is used, for example, analysis. The arithmetic simulation is performed by the YALMIP toolbox of MATLAB. The total costs and CO₂ emissions of the three scenarios are compared. The feasibility and validity of the proposed model are verified by the simulated results.