Research On The Optimal Dispatching Method Of Multi-micro-grid System In Urban Are

Global energy supply is facing challenges such as resource depletion,environmental pollution and energy security.Therefore,renewable energy represented by wind power and photovoltaic is gradually becoming a research hotspot in the field of energy production and energy consumption.As a new form of renewable energy utilization,microgrid integrated energy system can effectively integrate wind power,photovoltaic,micro-turbine and other distributed power generation,coordinate the supply and demand of electricity,gas,heat and cold energy in the system,and has the advantages of clean,low-carbon,safe and efficient.In addition,the multi-microgrid integrated energy system composed of various microgrid integrated energy system in adjacent areas has attracted extensive attention from researchers because of its higher renewable energy consumption rate,stronger ability to resist external interference and deal with uncertainty.However,compared with the single microgrid integrated energy system,the structure of the multi-microgrid integrated energy system is more complex.The energy interaction between microgrid integrated energy systems faced with problems such as competition game and transaction settlement.There are also conflicts of interest between operators and users in each microgrid integrated energy system.Therefore,based on the multi-microgrid integrated energy system in urban areas,this paper focuses on the economic operation of the microgrid integrated energy system and the optimal scheduling strategy of the multi-microgrid integrated energy system considering energy interaction and carbon trading.The main research contents are as follows:(1)The economic dispatch strategy of microgrid system considering integrated demand response is studied.Firstly,the operation architecture of microgrid integrated energy system with energy coupling on the energy supply side and the demand side is constructed,and the mathematical models of energy supply unit,energy coupling equipment unit,energy storage equipment unit and energy demand equipment unit are given.Secondly,based on the theory of electricity price elasticity and the alternative consumption of energy,a demand response model considering the “horizontal coupling” of electricity,gas and heat on the user side is established.Then,considering the influence of the transfer power characteristics and the transfer time deviation characteristics of the transferable power demand on the user’s energy satisfaction,a demand response model considering the “vertical transfer” of electric energy is established.Finally,an economic dispatch model of community microgrid integrated energy system considering integrated demand response is constructed with the goal of minimizing operating cost,and an example analysis and simulation verification are carried out.The simulation results show that the proposed economic dispatch strategy of microgrid integrated energy system considering integrated demand response can truly and comprehensively reflect the behavior law of microgrid integrated energy system users participating in demand response,deeply excavate the response potential of microgrid integrated energy system users,significantly improve the economy of system operation,and promote the consumption of renewable energy.(2)The bi-level optimization strategy of multi-microgrid integrated energy system considering energy interaction and carbon trading is studied.Firstly,taking the multifunctional urban areas such as industry-commerce-housing as the research subject,the economic low-carbon scheduling process of multi-micro energy network system in urban areas is analyzed from two aspects of energy supply and carbon emission trading,and a twolayer optimal scheduling framework of multi-microgrid integrated energy system is constructed.Secondly,a low-carbon management framework of multi-micro energy network system including initial carbon emission quota model,refined carbon emission accounting model and carbon emission trading model between micro energy networks is constructed.Then,the game relationship between the regional dispatching center and each sub-microgrid integrated energy system is analyzed,and a game model considering economic benefits and carbon emission reduction benefits is constructed.Furthermore,a bi-level optimal scheduling method based on the game is proposed.Finally,an example analysis and simulation verification are carried out.The simulation results show that based on the proposed model and scheduling method,the community microgrid integrated energy system can better meet the user’s load demand through electricity and gas energy interaction,and give full play to the advantages of regional multi-microgrid integrated energy system in resource coordination and energy mutual assistance.At the same time,the community microgrid integrated energy system can also fully carry out carbon emission trading within the region,reduce the overall carbon transaction cost of the region,and improve the low-carbon economic benefits of the multi-microgrid integrated energy system in the urban area.