| In the context of the current energy crisis and worsening ecological and environmental problems,large-scale development of renewable energy and improvement of clean energy utilization efficiency have become the inevitable trend of the times.The regional integrated energy system,which integrates multiple energy types and energy conversion equipments,can flexibly take advantage of the characteristics of various energy sources and the complementarity between energy sources,so as to realize the efficient use of multiple energy sources,and is an effective way to solve the problems of low energy utilization rate in society and the difficulty to absorb new energy.Energy storage equipment can realize the transfer of energy in time and space,and the configuration of energy storage in the regional integrated energy system can further improve the flexible adjustment performance of the system,however,due to the high cost of energy storage and it is difficult to meet the adjustment needs of multi-energy complementary systems,therefore,the reasonable configuration of multiple energy storage capacity is of great significance to the stable and economic operation of the system.On the basis of reviewing the research status of regional integrated energy system at home and abroad,relevant researches on the optimal configuration of energy storage capacity of the system are carried out,the operating characteristics of electric and thermal energy storage are analyzed,and the influence of various factors on the configuration capacity of energy storage are discussed.It demonstrates the necessity and feasibility of the application of coordinated configuration and optimization of electric and thermal energy storage in the regional integrated energy system.Based on the analysis of the main architecture and operating characteristics of the regional integrated energy system,the operation principle of each component of the regional integrated energy system is explained and mathematical modeling is carried out.Furthermore,in terms of energy saving,reliability and applicability of demand response strategies,indicators such as wind power consumption rate,load loss probability and user satisfaction are introduced respectively to provide a theoretical basis for subsequent system research.In order to improve the wind abandoning phenomenon caused by the "power by heat"operation mode of cogeneration units and the anti-peak regulation of wind power,considering the configuration of energy storage on the source side to realize the thermo-electrolytic coupling and improve the flexibility of the system.With the goal of minimizing the total cost including the investment cost of electric and thermal energy storage,the operation and maintenance cost of each unit equipment,the penalty cost of wind abandonment,and the cost of interacting with the large grid,an optimal configuration model for the electric and thermal energy storage capacity of the regional integrated energy system considering wind power consumption is established.The simulation results show that,compared with single energy storage,considering the complementarity of electricity and heat coupling,the coordinated planning and coordinated operation of electric and thermal energy storage can improve the system’s wind power absorption capacity,improve system economy,stabilize the output of cogeneration units,and make the system run stably and reliably.Based on the above model,load-side demand response is involved in energy storage configuration and system operation.The load is classified according to demand response characteristics,and different response types are mathematically modeled.The electric load price-based demand response and thermal load-incentive demand response are combined to form a integrated electricity and thermal demand response,making full use of the dispatchable value of load-side electricity and thermal demand response resources,and establish an optimal configuration model for the electric and thermal energy storage capacity of the regional integrated energy system considering the integrated demand response.The particle swarm optimization algorithm is used to solve the energy storage capacity in different scenarios,and the system operation results under different scenarios are analyzed.The results of the calculation examples show that the addition of the integrated electricity and thermal demand response has significantly improved the problem of large peak-valley difference between the electric and heating loads,and can greatly reduce energy storage allocation capacity,reduce energy storage investment,and improve the operating economy of the integrated energy system.Reasonable electric and thermal energy storage configuration and electricity and thermal demand side regulation,realizing coordinated operation of source,storage and load.Compared with only considering the configuration of energy storage to participate in system operation,it can further improve the ability to absorb new energy such as wind power and improve the economy and flexibility of the energy supply system. |
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