Research On Control Strategy Of Energy Storage Three-port Switch Boost Converter

In the photovoltaic power generation system,due to the addition of an energy storage device,the shortcoming of the intermittent energy output of photovoltaic cells due to environmental reasons is solved.The three ports of the three-port converter are connected to photovoltaic panels,energy storage batteries and loads,respectively,and have a high degree of integration.The three ports of the three-port converter are connected to photovoltaic panels,energy storage batteries and loads,respectively,and have a high degree of integration.No matter from economic cost or converter operation efficiency,it has strong advantages.This paper proposes an energy storage three-port switching boost converter for photovoltaic power generation systems.By studying the topology of the three-port switching boost converter,its working principle and operating characteristics are analyzed,and a corresponding control strategy is proposed for its power flow management,and it is applied to the photovoltaic power generation system.Firstly,this paper analyzes the topology of the three-port switching boost converter in depth.The converter does not need to be electrically isolated.On the basis of this,the advantages of higher power density and smaller volume of the non-isolated three-port converter are retained,and the disadvantages of narrower working range and limited port operating voltage are improved.It integrates the characteristics of the switching boost network,and controls the three degrees of freedom to make the topology have the characteristics of boost,buck,buck-boost,high integration,and unified power flow management between ports.Secondly,the working mode of the three-port switching boost converter is divided according to the power flow relationship.This paper analyzes the working principle in different working modes in detail.Subsequently,the system control strategy is divided into three parts for keyanalysis in the article.The first part is based on the working principle of the converter.This paper designs a control strategy for a three-port switching boost converter.This control strategy enables the three-port switching boost converter to autonomously complete power flow and smoothly switch between different operating modes.The second part is modeling analysis based on the working characteristics of photovoltaic cells,and analyzing the principle of MPPT control strategy and its application in DC/DC converters.The third part is the system power flow control strategy,which can automatically determine the system's working mode based on the battery SOC.Finally,the hardware platform of the system is designed in this paper.In consideration of system safety and operation reliability,the hardware required in the experiment is selected,and the software control program is programmed.Completed the establishment of an experimental platform to verify the system's working principle and control strategy.