Research On Optimal Allocation Of Integrated Energy System Considering Demand-side Management

With the access of a large number of renewable energy,such as scenery,the traditional power grid can not cope with the volatility and randomness of renewable energy very well.At the same time,the traditional economic model is gradually speeding up the transformation,and the problems of low energy efficiency and environmental protection have become increasingly prominent,while the integrated energy system relies on its complementary characteristics of multi-energy to realize the absorption and utilization of renewable energy through horizontal regulation.Integrated energy system will become the basis for the development of energy Internet in the future.The reasonable planning and design of the integrated energy system is a necessary prerequisite for using it to improve energy efficiency,so it is necessary to focus on the integrated energy system planning to ensure its good performance in terms of environmental,economic and social benefits.Demand-side management technology is also developing continuously.Demand-side management technology,represented by demand response,realizes the balance between supply and demand by coordinating the energy supply of the integrated energy system and the energy use of the user side.It brings new investment planning ideas and operation ideas to the integrated energy system.The continuous development of demand-side management technology also shows that it has received extensive attention all over the world as an important part of the development of energy system.At the same time,when dealing with the planning and operation of integrated energy system,renewable energy and load forecasting uncertainty are often seldom taken into account.On this basis,the impact of DSM on the configuration planning and operation of the integrated energy system is comprehensively considered from the economic,environmental and social benefits of the system.Based on the above background,according to the load demand and operation characteristics of the integrated energy system,this paper makes an in-depth research on the equipment unit modeling,thermal comfort and optimal configuration of the integrated energy system.The main work of this paper is as follows:(1)The overall architecture of the integrated energy system is built,on the basis of which the power supply equipment and auxiliary energy supply equipment in the system are studied in detail.The operation mathematical model of gas turbine and waste heat recovery boiler is established,and the static output characteristics of auxiliary energy supply equipment are analyzed.finally,the corresponding mathematical models of gas boilers,electric refrigerators and energy storage devices are established.(2)A two-layer optimal allocation model of integrated energy system considering demand response and user satisfaction is established.The model takes the economic cost of the system,annual carbon emissions and user dissatisfaction as evaluation indicators,and takes the operation,working status and energy supply balance of each equipment in the system as constraints.The planning results and operation of the integrated energy system are comprehensively analyzed and compared.By adjusting the price of participation demand response,the system can reduce the participation demand response and change the user load,and improve the energy satisfaction of users,so as to achieve the balance between system economy and social benefits.(3)With the continuous development of demand side management,the real-time balance of the original heat supply is transformed into the total balance under a certain thermal time scale,and the heat load demand is transformed into an interval that can fluctuate in a period of time.Then the thermal comfort index is used to characterize the comfort of users.Therefore,on the basis of the two-layer optimal allocation model of comprehensive energy system considering user satisfaction,combined with the characteristics of thermal energy supply,the real-time thermal energy balance constraint is transformed into thermal comfort index constraint,a two-layer optimal allocation model of integrated energy system considering user satisfaction and thermal comfort is proposed.Further explore the impact of demand-side management on system economic,environmental and social benefits;use interval robust optimization method to analyze the impact of renewable energy and load uncertainty on system planning;sensitivity analysis of the impact of low-carbon grid constraints on system configuration results.