| As the development of marine resources is getting more and more attention,how to efficiently utilize the abundant wind and solar energy in sea islands and their surrounding waters is one of the keys to improve the sustainable development and utilization of marine resources and alleviate the land-based energy and environmental problems.If the island group is regarded as a whole,through analyzing the topography and resource distribution characteristics of each island,it can be selectively built into energy storage island to undertake the task of energy storage,energy island to undertake the task of wind and solar power generation and load center island with high energy demand,and through the benign interaction of the island group,the ability of energy supply can be strengthened while obtaining higher economic value.The main research of this thesis is as follows:To cope with the randomness and volatility of new energy sources,this thesis constructs a seawater pumped storage station on an energy storage island to accommodate new energy sources such as wind energy.Firstly,the working principle and characteristics of the seawater pumped storage power station are analyzed;then,a typical daily data of a certain area is selected,and the model is solved by CPLEX with the lowest economic cost as the objective function and analyzed by calculation.The results show that the onshore energy system after considering the storage island accommodates 100%of the wind energy,while the system operation cost is reduced by 20.04%.To achieve the decarbonization of the energy supply side of the island,this thesis designs a new type of solar thermal power plant,i.e.,a molten salt tower power generation system based on S-CO2 Brayton cycle and compressed CO2 energy storage,and constructs it on an energy island.First,the working principle and characteristics of the solar thermal power plant are considered,and the corresponding mathematical model is established;then,a day-ahead dispatching model is constructed for the joint operation of the energy island and the land-based energy system;finally,the model is solved by CPLEX,and the arithmetic analysis is performed.The results show that the common solar thermal power plant（energy island）reduces the operating cost of the onshore energy system by 35.27%;the new solar thermal power plant reduces the operating cost of the onshore energy system by 42.93%and increases the percentage of wind energy consumption by 6.48%to 93.92%.In order to realize the cooperative and optimal operation among the main bodies of the island group,this thesis constructs a cooperative operation model of energy storage island-energy island-load center island bodies based on Nash negotiation,and by introducing the mobile energy storage system of"power exchange vessel+battery pack",the inter-island energy transmission does not depend on the submarine cable;then,uses the mean value inequality to decompose the original problem into the alliance Then,the original problem is decomposed into the subproblem of maximizing the benefits of island group alliances and the subproblem of negotiating payments for electrical energy transactions using the mean value inequality,and the cross directional multiplier method is used for the distributed solution.The proposed algorithm is verified by arithmetic examples that the model can be solved quickly while protecting the privacy of each subject;the revenue of the island group alliance and the benefits of each subject have been improved after participating in the optimization of cooperative operation. |
