| Traditional fossil energy is confronted with problems such as exhaustion of resources and environmental pollution.Clean energy,such as wind energy and solar energy,has an endless range of green and pollution-free features,and has developed rapidly in various countries.A comprehensive energy system,including distributed renewable energy generation,has emerged as the times require.However,with the increasing installed capacity of new energy,the uncertainty of wind power generation has become increasingly prominent.Large storage systems are required to ensure the stable supply of energy.Existing storage batteries have problems such as short life and not easy to store energy for a long time.The new hydrogen storage is characterized by green cleaning,long life and large storage capacity.It is also the main clean fuel for future travel.In view of the low cost of hydrogen storage,hydrogen storage systems have become an effective way to store large amounts of energy over a long period of time.The related technology of integrated energy system based on wind power generation,hybrid energy storage system and demand side hydrogen load is not perfect,and there are problems such as low energy utilization rate and high cost of power generation.In this thesis,the system model,system operation strategy and capacity allocation scheme of wind power photovoltaic hydrogen integrated energy system are studied in detail,including:(1)The mathematical model of wind,photovoltaic and hydrogen integrated energy system is established.The working principle and mathematical model of wind generator,photovoltaic generator,storage battery and hybrid hydrogen storage system in integrated energy system are analyzed.(2)Capacity allocation optimization of integrated energy system based on multiobjective optimization algorithm of NSGA-II is studied.This thesis describes the multiobjective function model and Pareto optimal solution set,establishes the mathematical model of NSGA-II multi-objective optimization algorithm,and combines the algorithm with capacity allocation optimization of integrated energy system.(3)Three operational strategies for integrated energy systems are proposed.Seven operating conditions of the comprehensive energy system are analyzed.According to the energy demand on the demand side,three operating strategies of system energy are designed: EOS1,which is the maximum utilization strategy of system energy;Priority is given to EOS2,which is the power load operation strategy.Priority for meeting the hydrogen load operation strategy EOS3.The priority of charging and discharging devices is designed for the three operating strategies in the system energy allocation at any time.(4)Validate the designed simulation model of the integrated energy system through a case.Select the environment and load data of the study site,set the constraints of the system,and set up a three-objective function based on cost,not satisfying load rate and discarded light rate.In order to solve the coupling problem of system decision variables,a dual-layer configuration capacity scheme of system equipment is designed.The first layer determines the capacity of wind power,photovoltaic,storage battery and hydrogen tank,and the second layer determines the capacity of electrolytic battery and fuel cell.Set up a system simulation platform based on MATLAB software.The optimal solution set and individual solution of system configuration based on EOS1 are obtained,and the system cost and device operation are compared and analyzed.Comparing and analyzing the optimal solutions of three different EOS;Analysis of the operation of system devices under the same system configuration.Through the experimental results of this case,it is concluded that the unit price cost of power generation obtained by the system in EOS1 is 0.2653 k W/USD,the unsatisfied rate of load is 0.78%,and the abandoned wind photovoltaic rate is 0.4%. |
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