Distributed Coordinated Optimal Scheduling Of District Electric-heat Integrated Energy System Considering Different Heating Modes Of Buildings

With the increasing demand for energy in industrial production and residential life,how to rationally utilize energy and improve energy efficiency has become a hot topic in academic field.The multi-energy system operates and manages the inside of the system through the traditional operation mode,and the operation mode of each main part reduces the energy production efficiency to a certain extent.In recent years,Chinese population urbanization and economic globalization have been deepening.With the development of the national economy,the problem of energy consumption in Chinese building clusters is particularly prominent.Up to now,the total energy consumption of domestic buildings has exceeded 30% of the total energy consumption of the whole society,which is contrary to the concept of green and balanced development that China upholds.The coordinated operation of regional integrated electricity and district heating systems（RIEDHS）can significantly improve energy efficiency.Since RIEDHS has the characteristics of multi-functional,complementary and multi-subject operation,the operation data of each sub-operation subject in the system has a certain degree of privacy.In this case,the traditional centralized optimal scheduling method will no longer be applicable.In view of the above problems,this paper fully taps the potential of buildings with different heating modes in providing system scheduling flexibility while protecting the privacy of operating parameters of the RIEDHS multi-agent operating system,and reduces system operating costs and increases photovoltaic consumption by utilizing the thermal inertia of buildings.The main research contents of this paper are as follows:1)The model of distribution network subsystem,thermal subsystem and building clusters’ thermal inertia in the regional electric-thermal integrated energy system is constructed,and the coupling conversion mechanism of electric and thermal energy in the regional integrated electricity and district heating systems and the energy supply modes of building clusters are analyzed,and the heat storage capacity of district heating system and building clusters with different heating modes is shown.Aiming at the different energy supply modes of heating in the buildings,the building clusters are divided into two categories: residential buildings and commercial buildings,and the building clusters with different heating modes are integrated into the regional integrated electricity and district heating systems as a heat storage unit with limited capacity.2)An optimal dispatching model of regional integrated electricity and district heating systems considering different heating modes of buildings is proposed,and the second-order cone relaxation technique is used to make the model convex for the non-convex nonlinear problem of branch power flow model of distribution network.Considering the internal temperature dynamic process in the heating area of the building clusters,the differential equation in the thermal inertia model of the building is expanded and solved by the differential method,and the optimal scheduling operation is carried out with the goal of minimizing the operating cost of the regional integrated electricity and district heating systems.The correctness and effectiveness of the model are verified by numerical example analysis,and the results show that using the thermal inertia of the buildings with different heating modes can realize the efficient utilization of multiple types of energy in the system.To a certain extent,it can improve the flexible operation capability of the systems and the level of photovoltaic consumption,thereby further reducing the total cost of system operation.3)The distributed optimal method of the alternating direction multiplier method is introduced into the optimal scheduling operation of the regional integrated electricity and district heating systems,and a distributed optimal scheme to solve the privacy problem of the internal operating parameters of the multi-agent operation system is proposed.The results of numerical example analysis show that the distributed optimal scheme can complete the optimal scheduling operation of the system while protecting the privacy of the operating system,and can give full play to the demand response potential of the regional integrated electricity and district heating systems.The alternating direction multiplier method with variable penalty parameters is used to further improve the convergence performance of the distributed optimal method,and the dependence of the alternating direction multiplier method on the selection of the initial value of the penalty parameter is relaxed.