Capacity Optimization And Software Research Of Hybrid Energy Storage System

In order to solve the problems of intermittent and fluctuation of output power in photovoltaic and wind power systems,as well as energy waste and environmental pollution in high-power pulsating load systems,it is necessary to introduce energy storage devices to suppress unbalanced power,while single energy storage system can not simultaneously meet the requirements of higher power density and higher energy density.Therefore,this paper uses supercapacitor-flywheel-battery hybrid energy storage system to make full use of the characteristics of different energy storage equipment.In this paper,a calculation method for optimal capacity allocation of supercapacitor-flywheel-battery hybrid energy storage system is presented.Firstly,the power distribution method based on Hilbert-Huang transform is used to divide the unbalanced power in the three power supply systems into three parts: high frequency,medium frequency and low frequency,which are suppressed by supercapacitors,flywheels and batteries respectively;then,considering the equivalent cycle life of the battery,the objective function including initial investment cost,replacement cost and maintenance cost is established;finally,according to the constraints of the three power supply systems,the objective function is solved by the particle swarm optimization algorithm with adaptive weight.In this paper,the calculation method for optimal capacity allocation of supercapacitor-flywheel-battery hybrid energy storage system is applied to three power supply systems.The simulation results show that the proposed method improves the working status of three power supply systems: in photovoltaic system,the economy and overall performance of photovoltaic system is improved;in wind power system,the fluctuation of grid-connected power is reduced,and the economy of wind power system is improved;in the high-power pulsating load system,it plays the role of “cost reduction,efficiency enhancement,energy saving and emission reduction”.Combining the foregoing findings,a hybrid energy storage application platform based on Delphi software is developed.The platform has good versatility and can be used for capacity optimization analysis of different power supply systems.