Research On Equilibrium Interaction Strategies For Integrated Energy System Incorporating Demand Side Management

Global energy depletion and climate change crisis are threatening the sustainable development of human society,and promoting the global electrification process and vigorously developing and utilizing renewable energy seem to be an important approach to solve the energy supply crisis in the future.However,the intermittent and random characteristics of large-scale renewable energy power generation make it difficult to occupy the leading position in the global power supply in a short time,and the share of traditional fossil energy power generation is still difficult to shake.Therefore,in addition to the development and utilization of renewable energy,the power sector needs profound change and innovation,so as to adapt to the high-speed penetration of renewable energy in the power sector and improve the production and utilization efficiency of power system.Hence the integrated energy system,a new energy supply mode directly facing the end energy users,came into being.Integrated energy system is the product of the vigorous development of clean energy and the deep integration of new technologies.It has the advantages of high energy supply efficiency and less pollution emissions,reflecting the requirements and trends of clean and sustainable development of the power sector.The integrated energy system contains various forms of energy production,coupling and storage equipment.Therefore,how to optimize all kinds of equipment and resources in the system reasonably,while achieving the goal of maximizing the interests of operators,to meet all kinds of energy needs of users in the system,has always been the focus for the operation of integrated energy systems.In addition,with the development and application of DSM technology,the interaction between user’s energy consumption behavior and operation scheduling strategy of integrated energy system is getting closer.To solve this problem,this paper analyzes the balanced interaction strategy of the integrated energy system operators and industrial users in the operation process of the integrated energy system under the demand side management technology based on the game theory.Firstly,this thesis establishes an electric-thermal integrated energy system,which includes power grid,heat grid and natural gas grid.Secondly,a two-stage Stackelberg dynamic game model is proposed to describe the game behavior of integrated energy system operators and industrial users in the process of participating in DSM.In the Stackelberg game model,the integrated energy system operator,as the leader of the game,first formulates the electricity price and heat price,and optimizes the operation and scheduling of the system according to the user’s energy using behavior to maximize its revenue;the user,as the follower of the game,takes the maximization of its own utility as the goal,making the best response to the energy demand of the electricity price and heat price issued by the integrated energy system operator.Then,for the complex two-stage dynamic game model established in this paper,the lower user side constraint optimization problem is replaced by its KKT condition,so that the two-stage hierarchical optimization problem is transformed into a single-stage mixed integer nonlinear optimization model,and the branch and bound method is introduced to solve it.Finally,the simulation analysis of the actual data proves the feasibility and effectiveness of the two-stage dynamic game model.