Researching On Multi-energy Transaction Mechanism And Cooperative Scheduling Strategy Of Solar-biogas Integrated Energy Microgrid

In China,biomass energy is diverse and widely distributed,but the comprehensive utilization rate and industrialization degree of biomass energy are low due to the influence of temperature change,difficulty of raw material collection,transportation cost and other factors.Biogas production is one of the main ways of biomass energy utilization,but the biogas production rate is very sensitive to temperature change,low temperature environment will inhibit the anaerobic fermentation rate of biogas digester,so the problem of biogas digester overwintering is an important bottleneck restricting the development of biogas industry.In this context,a solar-biogas integrated energy microgrid is established based on the energy complementary characteristics of solar energy and biogas,and the multi-energy market transactions among the solar-biogas microgrid,energy companies and heterogeneous end-users are studied.The main contents of this paper are as follows:(1)A multi-energy complementary model of solar-biogas integrated energy microgrid is established to supply electricity,heat and biogas,which improves the output and utilization rate of biogas.The influence of temperature on the biogas production rate and the energy complementary relationship between solar energy and biogas are considered in this microgrid,forming a multi energy coupling matrix of solar energy biogas to electricity-heat-biogas.Then,the stochastic optimization scheduling strategy of the solar-biogas microgrid is studied through the scenario analysis of solar energy output and modeling the scheduling model of energy conversion and storage devices.The results show that the profit and the level of renewable energy consumption of the microgrid are improved by choosing a reasonable electricity-heat-biogas supply strategy to arrange the operation and scheduling of system devices.(2)A multi-energy hierarchical transaction framework is constructed to realize the collaborative optimization of the solar-biogas microgrid and the heterogeneous end-users.On the one hand,end-users can purchase energy from the solar-biogas microgrid or from energy companies;on the other hand,the solar-biogas microgrid can sell energy to end-users and energy companies.The optimal pricing strategy and collaborative scheduling model of the solar-biogas microgrid are studied based on the comprehensive energy demand response of end-users.The results show that the solar-biogas microgrid can make full use of the complementary advantages of multi energy and the flexibility of demand side response,and improve the end-user demand for renewable energy.(3)A bilateral trading model of the solar-biogas microgrid and end-users based on Stackelberg game is established to analyze the economic behavior of the solar-biogas microgrid and end-users in energy trading,and improve the initiative of end-users to participate in energy trading and the satisfaction of energy consumption.The trading model considers the solar-biogas microgrid and end-users as different stakeholders,optimizes the pricing strategy of the solar-biogas microgrid,end-users satisfaction and internal equipment scheduling strategy,and proves the unique existence of game equilibrium.Then,the model is transformed into a mixed integer quadratic programming model by Karush-Kuhn-Tucker condition,complementary constraint linearization and strong duality theory.The results show that the profit of the solar-biogas microgrid and the satisfaction level of end-users are improved,and a win-win situation is achieved.