| The development trend of clean energy in the world has been irreversible.The mode of energy production and consumption is undergoing a major change.The depletion of traditional fossil energy and the serious pollution to the environment caused by the use of fossil energy have greatly hindered the sustainable development of the world economy.Integrated energy system can not only improve energy efficiency,but also the diversified energy demand.As a new integrated energy system,it can promote the sustainable development of energy.Hydrogen can be used as a secondary carrier of renewable energy because of its many sources,clean and pollution-free,high energy density,renewable,easy storage and wide use.The combination of hydrogen storage and wind-photovoltaic hybrid power generation system as energy storage of renewable energy generation can greatly improve the impact of large-scale wind-photovoltaic power generation on the grid.The electrolyzes can also reduce the rate of discarded wind and light,and improve the power quality of grid-connected power generation.Firstly,the background and significance of the research and the current situation at home and abroad are elaborated,and the integrated energy system model of wind-solar-hydrogen storage is built.The characteristics of fan,photovoltaic,battery and hydrogen storage and hydrogen production system in the system are analyzed.According to the constraints of user's electricity load demand,wind power and photovoltaic distribution data,the model of each component unit in the system is determined,and the selection of devices is completed.Then,the control strategy of the system energy storage unit is studied,and the control strategy is added in the subsequent simulation.The advantages and disadvantages of the existing battery charging and discharging are analyzed,and the battery charging and discharging zoning control strategy is proposed.The charging stages of the battery are divided.According to the different stages of the battery SOC value,different charging methods are adopted to achieve fast,efficient and low damage charging of the battery.The control strategy of battery-hydrogen energy storage hybrid energy storage unit is studied.According to the characteristics of slow response of hydrogen energy storage unit,the corresponding control strategy is proposed,which can reduce the start-stop frequency of hydrogen energy unit and achieve the effect of prolonging the life of hydrogen energy unit.Secondly,the fast non-dominated genetic algorithm(NSGA-?)with elitist strategy is analyzed.Its evolutionary operator can not be changed according to the number of iterations and the external environment,thus affecting the optimization results is studied in detail.An adaptive evolutionary operator is proposed.On the basis of hierarchical non-dominated sorting,the algorithm can be optimized by improving its self-adaptive ability.The crossover rate,mutation rate,crossover distribution index and mutation distribution index are adaptively changed according to the number of good and bad individuals in different iteration stages and temporary population.The simulation results of ZDT function show that the improved algorithm has improved search efficiency and population diversity,and achieved the effect of restraining prematurity and accelerating convergence of the algorithm,so as to enhance the global ability of the algorithm.Finally,according to the wind,PV,user load distribution curve and the selection results of various components of the system,the improved algorithm with adaptive operator is added to the control strategy of the energy storage unit to reduce the system cost and load.Optimize the target,simulate the system capacity,and configure the capacity of each unit of the system.The simulation results show that the optimized configuration scheme load power shortage rate and system cost are effectively reduced,the load power shortage rate is only 0.065,and the system cost is 60629752.58 yuan.The energy storage control strategy proposed in this paper makes the batteries discharge evenly during operation,which effectively prolongs the service life of the energy storage system and improves the stability of the whole system in order to appear the phenomenon of over-charge and over-discharge. |
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