Research On Optimization And Comprehensive Evaluation Method Of Multi-energy System Considering Carbon Trading

China is in an important stage to achieve carbon peak and carbon neutrality.With the gradual improvement and development of China’s carbon trading system,optimizing the allocation and coordinated operation of integrated energy micro-grid considering the carbon trading mechanism is an effective means to achieve multi-energy efficient utilization and reduce carbon emissions.Therefore,when optimizing the allocation of integrated energy system,the influence of carbon trading price and quota on its carbon trading cost is fully considered in this paper,and the effective emission reduction of integrated energy microgrid is guided by the carbon trading mechanism.When coordinating and optimizing multi-integrated energy micro-grid,the influence of carbon trading on micro-grid interaction is considered to realize multi-agent low-carbon economic operation.When evaluating the configuration and operation results of Integrated energy microgrid,a relatively complete Integrated Energy Microgrid（IEM）comprehensive evaluation method is established to ensure the correctness and rationality of configuration and operation scheme.Firstly,the modeling and comprehensive evaluation methods of integrated energy microgrid are studied.Based on the IEM architecture of a practical distributed energy station in Hunan province,the equipment modeling is carried out to establish mathematical models including chiller,gas boiler,heat pump,centrifugal chiller,energy storage device,P2G equipment and photovoltaic device.Put forward the consideration of economy,energy consumption and environmental comprehensive evaluation system,and by using probability statistical data standardization method and the minimum combination method to evaluate its comprehensive energy network,the example verified the effectiveness and applicability of the comprehensive evaluation method,to enhance its comprehensive energy network running state to provide guidance.Secondly,an optimal allocation method of integrated energy microgrid considering carbon emissions and carbon trading in the whole life cycle is proposed.P2G and PV are important low-carbon equipment to reduce carbon emissions and assist in carbon neutralization.However,P2G and PV produce a large amount of CO₂ in the manufacturing process,so the impact of carbon emissions in the equipment production and recycling process on IEM optimal configuration needs to be considered.The whole-life cycle carbon emission calculation method of P2G and PV is given.The objective function is to minimize the sum of carbon emission cost with step-penalty mechanism,energy purchase cost including water cost and equipment investment cost,and a joint optimal allocation model of P2G and PV is established.The calculation example shows that this configuration method can greatly improve the PV and P2G access capacity of low-carbon equipment,ensure the economic operation of the system and effectively reduce the carbon emission of the system.In addition,based on the operation data of integrated energy micro-grid after configuration,the micro-grid status of different examples is comprehensively evaluated to verify the rationality of the configuration method.Finally,an optimal operation method of multi-integrated energy microgrid considering carbon trading between microgrids is proposed.The OCP-CCHP-CHP two-layer model is established based on the interaction mechanism of master-slave game.The Lagrange multiplier method and KKT condition are used to transform the optimization model into an equivalent single-layer model to solve the problem.An example is given to verify that the cooperative operation strategy of multi-microgrid with real-time carbon trading between microgrids can improve the system’s capacity to absorb new energy,improve the economic benefits of each microgrid,reduce the overall carbon emissions of the system,and achieve a win-win situation of multi-actors.Based on the operation data of OCP microgrid,the operation status of the microgrid under different operation strategies is comprehensively evaluated to verify the rationality of the operation strategy in this paper.