Abstract: With the gradual advancement of the "double carbon" goal, new energy technologies have continuously made breakthroughs, and the proportion of the thermal-electric system involved in biogas power generation in the optimization of rural energy structure has gradually increased. It is extremely urgent to carry out research on biogas power generation system participating in thermoelectric scheduling model. In this paper, based on the characteristics of biogas power generation, a rural "chemical-thermal-electric" coupling system is established, and the feasibility and importance of the system are demonstrated. Secondly, a new thermodynamic cycle system is adopted in the established system. By establishing a dynamic model of the heat network considering virtual energy storage, the heat energy can be transferred across time periods. Then, based on the whole process of biogas from generation to power generation, a "biogas-heat-electricity" combined storage and supply unit is proposed to realize the effective integration of chemical energy, heat energy and electric energy in the system and maximize the energy utilization efficiency of the whole system. Finally, this model takes the 51-bus system as an example to carry out an empirical analysis. The results show that the ' chemical-thermal-electric ' coupling system proposed in this paper can not only make up for the disadvantages of uncertain wind and solar output, but also significantly reduce the carbon emissions of the system by integrating multiple energy forms, showing its dual advantages of environmental protection and economy in the modern rural energy structure.