Study On Optimization Of Battery Management Strategy In Solar LED Lighting System

Nowadays,with the rapid development of the world economy and the increasing demand for energy,solar LED lighting system has the dual advantages of using green solar energy and high efficiency LED.It is of great significance to use such systems in a large number to alleviate the problem of energy shortage.The cost of battery pack in solar LED lighting system accounts for a large proportion.Because of the inconsistent characteristics of each cell,the life of battery pack is much shorter than that of a single cell.At present,many different battery management strategies proposed by scholars can greatly improve the battery life,but they all have the problems of complex structure and high cost,which make it difficult to directly apply to low-power solar LED lighting system.Based on the analysis of the principles and advantages and disadvantages of current battery management strategies,this paper studies the battery management strategies in solar LED lighting system.By applying the idea of carrier cascade to cascade topology,a battery management strategy based on carrier cascade is proposed to balance the working voltage of individual batteries in solar LED lighting system.By analyzing the commonalities of MPPT control strategy and battery management strategy in solar LED lighting system,an adaptive variable step size MPPT algorithm is combined with the battery management algorithm mentioned above.An optimized battery management strategy is proposed.The simulation model is built by using MATLAB/Simulink simulation software,and the simulation analysis and comparison of charging and discharging before and after optimization of battery management algorithm are carried out.The simulation results show that the optimized battery management algorithm can make the individual batteries in the battery pack reach the equilibrium state faster,and the voltage difference between the individual batteries after the equalization is small,which is more conducive to reducing the life attenuation of the battery pack.Based on the above research,in order to apply the optimized battery management strategy to the practical system,considering the cost,volume and switching loss of the product,a solar LED lighting system is designed,which includes hardware circuit,optimized software program of battery management algorithm and other related software programs.MPPT charging and battery charging are carried out in the system.Electrical management,LED discharge,wireless transceiver and other functions of the test.The experimental results show that the battery management strategy proposed in this paper can make the individual batteries of the battery pack reach equilibrium state quickly and the difference is small,and the lighting system works stably and has a long service life.It is suitable for home lighting or field portable use in economically underdeveloped areas.Appropriately increasing power can be applied to Street lamps,power stations and other occasions,and has a wide range of applications.