Research On Operation Mechanism Of Multi-energy System Considering Demand Response

Nowadays,the increasingly severe environmental pollution and energy shortage crisis trigger a new round of energy revolution,promote people to study the comprehensive utilization of electricity,gas,cold,heat and other forms of energy and build multiple energy systems(MES)which can greatly improve the operation efficiency and energy utilization efficiency of the energy system.At the same time,the tremendous load demand,the complex load characteristics,the reinforced coupling relationship between different energy sources as well as the continuous development of demand response mechanism bring new opportunities and challenges to the coordinated operation of multi-energy systems altogether.Given the above background,this paper focuses on the operation of multi-energy system with demand response.The main work includes:(1)The model for energy hub system is established.The abstract model for energy hub is considered as the starting point to study the operation mechanism of multi-energy system.The characteristics of each typical energy equipment including those responsible for production,conversion and storage in the energy hub are presented,followed by the mathematical model of each equipment.Taking the energy service supplier as the operational body of the energy hub,the internal optimal operation model of the energy hub is proposed to build the physical framework and model foundation for the research.(2)A multiple energy system optimal operation model considering the demand response based on the theory of price elasticity of demand is proposed.Based on the theory of price elasticity of demand,a price-based demand response model for elastic electrical,thermal and cooling loads is established to describe the interaction potential of users in the energy hub.Taking the energy service supplier as the operational body of the energy hub,this paper constructs an optimized operation model aiming at the maximum net revenue of the energy service supplier,and analyzes the impact of the demand response and energy storage equipment on the operation of multi-energy system.The simulation results show that the proposed multienergy system optimization model can improve the operation revenue of energy service supplier and relieve the power supply pressure in peak periods.(3)The comprehensive demand response model is developed.Take the cooling,heating and power load in the energy hub as research objects which are classified into the immediate adjustable load,the time-limited transferable load and the non-time-limited transferable load respectively on the basis of the responsive characteristics of the multi-energy load.The refined response model and the cost function are established respectively.(4)A double-level optimal operation model of multi-energy system considering the multienergy response characteristics is proposed.With the goal of maximizing the net operating revenue of the energy service supplier and minimizing the energy cost of users,a double-layer optimization model considering the multi-energy retail prices as variables that influence the behavior of users is established based on the energy hub system model and the multi-energy response model.Considering the impact of wholesale price uncertainty on operation economy,the upper level model with uncertain parameters is transformed into robust equivalent model using robust optimization and the double-level model is solved by the commercial solver(GAMS/CPLEX)iteratively.The results show that the proposed double-level optimal operation model can not only improve the net revenue of the energy service supplier and relieve power supply pressure during peak periods,but also ensure the interests of users participating in demand response.