The Research On Wind Hydrogen Comple Mentary Mixed Energy Storage Capacity Configuration Economic Optimization

In recent years,the installed capacity of wind power generation has been growing rapidly.In 2018,China's total installed capacity of wind power units ranks first in the world.However,wind power is easy to be affected by natural conditions and has the characteristics of randomness,intermittency and volatility,which is not conducive to large-scale grid-connection;in addition,the wind turbine has "reverse load" characteristics.During the night when the power load is low,the wind speed is higher and the output power is greater,which may cause a lot of wind abandoning.In order to solve the instability of wind turbine output power and reduce wind abandoning,the current research plan is to install energy storage equipment in the wind farm system and use the energy storage device to cut peak and fill valley for the output power of the wind farm.In this way,the power fluctuation of the system can be reduced,wind abandoning can be absorbed,and the overall economy of the wind farm can be improved.As a new energy storage medium,hydrogen has many advantages,such as clean and environmental protection,convenient storage and transportation,and high energy density.As a new type of hybrid new energy power generation model,the wind-hydrogen complementary power generation system selects the hydrogen generation system as the energy storage unit of the wind power system.And it uses hydrogen burning power generation unit as the supplement of wind power unit output power,which can effectively suppress the fluctuation of wind power.By analyzing the characteristics of energy storage components,the energy storage system composed of electrolytic cell,hydrogen storage tank,hydrogen and oxygen fuel cell and supercapacitor is selected in this paper.A wind farm power distribution method based on the variational modal decomposition algorithm is proposed,and the energy control strategy under two modes of island operation and grid-connected operation is established;in addition,a model of each energy storage unit was established on MATLAB/Simulink platform,and the control strategy of the hybrid energy storage system was simulated to verify its calming effect on wind farm output power.In order to realize the economic optimization of capacity allocation of wind-hydrogen complementary system,put forward specific indexes for evaluating the operation economy of wind farm,establish the objective function of capacity optimization of wind-hydrogen complementary system under island mode and grid-connected mode,the capacity allocation of wind hydrogen system under two operating modes was optimized based on the improved multi-objective particle swarm optimization algorithm.Based on the wind farm data of Dabancheng and other places,numerical analysis was carried out to verify the effectiveness of the configuration scheme.At the same time,the economic benefits of the wind-hydrogen complementary power generation scheme are statistically analyzed.And based on the calculation example,IRR internal rate of return of wind and hydrogen complementary power generation system is preliminarily calculated.The calculation results show that the IRR of the wind-hydrogen complementary power generation scheme under the configuration scheme is higher than the benchmark rate of return.