Study On Optimized Configuration And Coordinated Control Of Battery Capacity In Energy Storage Photovoltaic Power Station

Focusing on the current research hotspots such as how to reasonably configure energy storage capacity and effectively control energy storage for energy storage photovoltaic power station,the thesis takes photovoltaic penetration rate and system reliability as indicators,configure photovoltaic and energy storage capacity for the photovoltaic storage power station.On this basis,with the goal of economy,solve the optimal ratio of different types of energy storage in hybrid energy storage,based on the configuration results,the coordinated control strategy of the hybrid energy storage system is studied to achieve stable,reliable,and economical operation of the photovoltaic storage system.The thesis work is summarized as follows:Firstly,the structure of the photovoltaic storage system is designed,and the modeling analysis of each unit of the system is carried out.Due to attenuation model in the existing storage life mostly considered in energy storage charge and discharge rate,but as the energy storage unit of the pv systems,energy storage of discharge ratio is not good control,so this article abandon the discharge ratio influence on energy storage life,should be reduced to the state of energy storage charged and discharge depth,and the life of attenuation model optimization for the calendar and solid electrolyte interface membrane decay of combination,make it more reasonable in the energy storage configuration.Secondly,use PV penetration rate and reliability of photovoltaic storage power station as indicators to establish capacity allocation model,on this basis,according to the typical curve of photovoltaic power generation and the typical load curve of a specific area within a year,configure a reasonable capacity for photovoltaic and energy storage when the load is certain,combined with the energy storage correction model,accurately obtain the total capacity configuration of typical energy storage.Nextly,to configure a typical energy storage capacity of the premise,in order to further obtain the optimal configuration capacity of hybrid energy storage different medium,the thesis on the traditional particle swarm(PSO)algorithm was improved,in view of the hybrid energy storage configuration model of multi-objective optimization,a hybrid energy storage economic optimum as the optimization goal,using IPPSO to calculate the optimal capacity ratio of hybrid energy storage,prove the superiority of the improved algorithm compared with traditional particle swarm optimization.Finally,according to the voltage stability control requirements of the photovoltaic dc bus,in order to unleash the different types of the hybrid energy storage features,the thesis designed a frequency divider for the hybrid energy storage,to realize the power type battery and energy type battery to suppress the high and low frequency power respectively.On this basis,the event-triggered control strategy of the hybrid energy storage groups is designed to achieve power balance control among multiple groups of hybrid energy storage groups.the results show that the power division method within the hybrid energy storage group can unleash different types energy storage,and based on event trigger control method of the between hybrid energy storage group effectively reduces the communication times and improve the dynamic and static performance of system bus voltage.