Research On Bi-Directional DC/DC Converter And Power Distribution Strategy For Hybrid Energy Storage System

As energy and environmental protection issues are increasingly valued,vigorous development of green energy becomes an inevitable trend.The home energy router is conducive to the full and reasonable utilization of renewable energy,and the hybrid energy storage system can enable the home energy router to maintain efficient and stable operation.Therefore,it is of great significance to study related issues such as power converter topology,control method and power distribution strategy of hybrid energy storage system.This paper will design the topology of the power converter applied to the hybrid energy storage system under the application background of the home energy router,and design its control method to achieve closed-loop control,and on this basis,design the power distribution strategy of the hybrid energy storage system.First,we study a staggered parallel current type three active bridge power converter,analyze its working principle in detail,and quantitatively analyze its power transmission relationship.On this basis,the hardware decoupling method of the topology structure is studied to remove the coupling relationship between the control variables,which lays the foundation for further phase shift control,and the topology structure is verified through simulation experiments.Secondly,the control method of staggered parallel current type three active bridge power converter based on neural network sliding mode control is studied.Aiming at the dynamic performance of the staggered parallel current-type dual active bridge,the research of sliding mode control is carried out,the neural network is optimized by genetic algorithm,and the sliding mode control parameters are adjusted by the neural network to improve the steady-state performance of the converter.Combined with the three-port power converter decoupling method,the control method is extended to the case of three active bridges,and the control method is verified through simulation experiments.Then,based on the research of the above power converter and its control method,the power allocation strategy of the hybrid energy storage system is studied.Using fuzzy control to construct the basic allocation strategy,introducing power allocation priority rules to avoid the conflicts of variables in the control process,and combining with the frequency division control idea to improve,comprehensively considering the two aspects of the state of charge and frequency,to further realize the battery Protection,the performance of the power distribution strategy is verified by simulation experiments.Finally,a hardware experiment platform for a hybrid energy storage system based on a staggered parallel current source type three active bridge power converter is built,and the feasibility and effectiveness of the above circuit topology and control method are verified through physical testing.