Study On Electric-Thermal Integrated Energy System With Ground Source Heat Pump And Advanced Compressed Air Energy Storage

With the gradual advancement of the Third industrial revolution,energy structure transformation and the concept of multi-energy complexes have been deepened.Vigorously developing clean energy and slowing down the development of traditional fossil energy have become the only way to transform the energy structure.Wind energy has become one of the most promising clean energy sources due to its renewable and non-polluting characteristics.However,in the development of wind power technology,the low utilization rate of resources,the serious problem of wind abandonment and the difficulty in accessing wind power into the network seriously restrict the rapid development of wind power.In order to promote wind power grid access and ease the problem of wind abandonment,the electric heating integrated energy system came into being in the context of the energy Internet concept,and the energy utilization rate is improved through coordinated operation of multiple energy sources.Based on the basic problems of wind power consumption,this paper proposes an economic dispatch model including the Ground Source Heat Pump(GSHP)and the Advanced Adiabatic Compressed Air Energy Storage(AA-CAES),and this article has conducted in-depth research.The details are as follows:Firstly,this paper proposes the specific composition of the electric heating integrated energy system,including thermal power plants,thermal power plants,wind farms,heat storage,the GSHP and the AA-CAES stations.The operating principles and advantages of cogeneration unit,heat storage unit,the GSHP and the AA-CAES system are described,and the above four modules are modeled in the operation mode.Secondly,this paper proposes an economic dispatch model of electric heating integrated energy system,and analyzes the mechanism of abandonment of heat storage device,the GSHP and the AA-CAES station.Under the condition of completely eliminating wind power,the critical relationship between the heat rate and the electrical power of the GSHP and the AA-CAES station is deduced.The economics of the system is discussed through simulation and the influence of heat storage device,the GSHP and the AA-CAES station on wind power consumption is analyzed,and the feasibility of the proposed model is verified.By comparing the relationship between the theoretical electric power of the AA-CAES station and the actual optimized electric power under the critical relationship,the correctness of the derivation of the critical relationship is proved.Finally,this paper applies the Life Cycle Cost(LCC)assessment method to model the cost of the GSHP and AA-CAES station,and combines the coefficient estimation method and the capital recovery coefficient method to improve the LCC of both.Based on the life cycle cost model,the benefits of the combination of different capacity in the GSHP and the AA-CAES station under the optimal scheduling scheme are studied by simulation.A more reasonable capacity combination scheme is selected and analyzed the influence trend of the GSHP and the AA-CAES station with relevant examples.The cost recovery period under the optimal scheme is calculated and the output-to-input ratio of the whole life cycle is given.