Study On Capacity Allocation And Energy Management Strategy Of Wind Hydrogen Coupling System

As one of the renewable energy sources,wind power is developing rapidly.Due to the impact of grid construction level and wind power uncertainty,the wind power issues have become increasingly prominent in wind enrichment area,and wind curtailment is more and more serious,hydrogen production by wind power is one of the effective ways to absorb wind power and use wind power curtailment.Based on the analysis of the structure and operation characteristics of the wind hydrogen coupling system,the equivalent mathematical model of each unit is established,based on the statistical analysis of wind power in wind farm and wind farm group,the optimal capacity allocation model of hydrogen production system is constructed by using interval fitting method,and multi attribute decision making method is used to develop the configuration scheme of electrolyzers.This paper analyzes the influence of the power consumption,the market price of hydrogen,the utilization rate of wind curtailment and the annual utilization hours of wind turbines on the capacity allocation,the effectiveness of the proposed model and method is verified by comparing the installed capacity of the 30 MW wind farm with the 100 MW wind farm.In the energy management of wind hydrogen coupling system,according to the operation characteristics of the wind hydrogen coupling system,resource hub model was built,which optimizes energy management from different time scales.With the best economic performance of the system as the goal,considering the uncertainty of wind power,hydrogen demand and hydrogen storage,the linear programming model of wind hydrogen coupling system is established in the day before.In real time scale,the 0-1 integer programming model is established,which is based on the switching operation and operation state of electrolyzers,and the power fluctuation of the wind power is realized by the use of the super capacitor.The effectiveness of the proposed method is verified by the example of the 30 MW wind farmBased on the analysis of the optimal capacity of hydrogen production system,the capacity allocation of hydrogen production system has obvious scale effect,the larger the wind curtailment is,hydrogen production system of wind power consumptive effect is more obvious,and the economic and environmental benefits are higher.Under the premise of meeting the demand of hydrogen supply,the uncertainty of the grid connected power of the wind farm can be reduced by reasonable arrangement of the fuel cell output in the day before the scheduling optimization model.In the real time scale,the operation of the switch and the charge anddischarge power of the supercapacitor are optimized,under the premise of satisfying the operation time and the switching time of the electrolyzer,the power fluctuation of the wind power in real time scale is stabilized.