Optimal Operation Method Of Integrated Energy System Based On Cooperative Game

Due to that the capacity of a single microgrid(MG)is limited,forming an interconnected microgrid system(IMS),i.e.sharing load and reserve capacity with adjacent MGs,has the benefits of enhancing system reliability,expanding power supply range and improving new energy absorption rate.However,most of the existing studies only focus on the electrical energy optimization of multi-microgrid.In integrated energy market,cold,heat?gas and other energy resources can also be classified into the broad demand-side resources category and participate in energy trading so as to achieve the coordinated optimization of integrated energy network,which is ignored.In order to achieve clean and efficient utilization of energy and improve the consumption rate of renewable energy,we propose an optimal operation method of integrated energy system based on cooperative game theory.Firstly,a energy sharing structure of multi-microgrid in integrated energy system is proposed.Each microgrid can use both electrical and thermal energy simultaneously,which can also participate in the demand response with electricity and heat.Secondly,the basic model of integrated energy system are built in detail,including photovoltaic model,CHP system model,thermal storage system,electrical and thermal load,network cost of electricty and heat,electricity purchase and sale cost of distribution network.Then,a cooperative sharing modelof integrated energy system are proposed.Each microgrid aims at maximizing the benefits of the alliance and can use electricity and heat simultaneously within the alliance.In addition,the distributed optimization algorithm based on alternating direction method of multipliers(ADMM)is used to solve this problem,which greatly protects the privacy of prosumers.Moreover,a reward distribution scheme based on Shapley value among MGs in the alliance is used to ensure the fairness of distribution.Finally,the effectiveness of the proposed model and method is verified by an practical example.The results show that in the optimization process,each MG can complete the optimal dispatch only by exchanging the expected exchange power and the expected exchange heat,so that the total operation cost of the system is the lowest and the privacy of each microgrid is protected.Considering the PV power,electricity price,power generation cost,power utility and heat utility,the MG decides the actual power consumption,heat consumption,trading electricity with the grid,CHP power generation and heat production and so on synthetically.On the basis of meeting the demand of electrical and thermal load,the total operating cost is the lowest.Based on the optimization method of integrated energy system proposed in this paper,the total cost of integrated energy system is reduced,and the cost of each MG is also reduced.