Research On Capacity Optimization And Configuration Scheme Of Wind-hydrogen Coupling System

With the increase of wind power installed capacity,large-scale grid connection has become an inevitable trend in the development of wind power.The wind-hydrogen coupling system utilizes the regulation effect of the hydrogen storage energy storage system on output power to reduce system fluctuations and improve wind power utilization,the research on the capacity ratio and optimized configuration of the wind-hydrogen coupling system is as follows:By comparing the parameter characteristics of different devices and combining the operating characteristics of the wind-hydrogen coupling system to determine the system composition scheme.The hydrogen energy storage system consists of alkaline electrolytic cell,proton exchange membrane fuel cell,hydrogen storage tank,and super capacitor,the wind-hydrogen coupling system consists of hydrogen energy storage system and wind turbine,they cooperate to control the output fluctuation rate of the system.The empirical modal decomposition algorithm and the variational modal decomposition algorithm are used to decompose the wind power signal,by comparing the modal components and corresponding spectrum diagrams of the two algorithms,it is verified that the modal aliasing does not appear in the variational modal decomposition algorithm,which avoids the problem of signal distortion during the iteration process,and has a higher resolution when separating low-frequency components,it can better decompose the wind power gridconnected power and the smooth target power component of the hydrogen production energy storage system to make a data basis for optimizing the system capacity configuration.Based on the known target power of hydrogen storage energy system,combining the energy coupling relationship between wind energy and hydrogen energy in the windhydrogen coupling system,the power balance relationship in the system is discussed in three cases,and the system operation control strategy is proposed.At the same time,two performance indicators affecting the output power quality of the system are proposed,which are the system load power failure rate and the system output power fluctuation rate.On this basis,in order to ensure the economy of the system and the stability of the output power,a multi-objective capacity allocation optimization model with the lowest operating cost and the smallest power deviation is established.Aiming at the problem that the basic whale optimization algorithm is easy to fall into the local optimization and slow convergence,an improved control parameter declining strategy is proposed to adjust the search step size,and adapt the switching action of global search and local search during the actual iteration of the algorithm,at the same time,a random difference mutation strategy is introduced to increase the population diversity and reduce the probability of the algorithm falling into a local optimal phenomenon,resulting in an improved whale optimization algorithm.The improved whale optimization algorithm was used to solve the capacity allocation optimization model of the wind-hydrogen coupling system,and obtain the optimal allocation plan.Finally,an example analysis is performed to verify the feasibility of the wind-hydrogen coupling system in suppressing system power fluctuations,improving wind power utilization,and increasing the grid-connected power value of wind power systems.