Carbon Emission Accounting for Integrated Energy Systems Considering Network Interconnection

Integrated energy system (IES) combines three types of energy, namely electricity, gas and heat, which can effectively improve the utilization of energy and realize the energy complementarity between different energy systems. The operation mode of the integrated energy system is complex, and various energy sources are converted to each other, resulting in the carbon emissions generated by different energy sources coupled with the energy flow. It is of great significance to clarify the distribution of carbon emission flows in the integrated energy system for the operation optimization of low-carbon integrated energy system. Based on the carbon emission flow theory and power flow tracing theory, this paper proposes a simplified carbon emission flow model for integrated energy system, and analyzes the carbon emission intensity of each node of the integrated energy system through matrix operation. Specifically, firstly, the carbon emission flow model of three energy systems converted into a network is established. Secondly, a calculation model of carbon emission flow for unified integrated energy system is proposed through matrix operation. Finally, based on the integrated energy testing system, the effectiveness of the proposed method is verified.