Research On Model Predictive Control Of Three-Port Converter Based On Hybrid Energy Storage

After entering the industrial era,the level of science and technology has developed rapidly,and the corresponding energy demand is also increasing.In the process of pursuing carbon neutrality,people are more and more eager for green energy to replace fossil energy,but these energy sources are stable in power generation.Poor performance,usually need to increase the energy storage device to improve the reliability of power supply.The multi-port converter can realize the bidirectional transfer of energy,and has a good development prospect in the application of power conversion.In order to obtain the working characteristics of the energy storage elements and realize the overall function of the system,mathematical modeling is carried out for the energy storage elements required by the system,and a simulation model is built.Model the photovoltaic cell,build a simulation model,and obtain its power generation characteristic curve.According to the working characteristics of the photovoltaic cell,the maximum power tracking is realized by an external boost conversion circuit,so that the photovoltaic cell can work at the maximum power output point,and the circuit simulation model is built to verify Feasibility of boost circuits and algorithms.The system realizes the free flow of energy between ports through the three-port converter.Firstly,the working mode of the dual active bridge is analyzed,and its power transmission is analyzed and modeled,and the dual active bridge model predictive control model is built.Analyzing and modeling the power transmission of the three-port converter,introducing a dualtransformer three-port converter can realize energy transmission and hardware decoupling.The calculated power predicted by the model is taken as the total external output power of the hybrid energy storage system,and the corresponding controller is designed based on the control objective of the hybrid energy storage system.The overall control scheme of the hybrid energy storage system is designed.The power predicted by the model is given as the total power of the hybrid energy storage system.The low-pass filter is used inside the hybrid energy storage system to realize power distribution,and the power that the hybrid system needs to output is based on the energy storage elements.The power distribution strategies based on the first-order and second-order filters are comparatively studied.In the protection link of the energy storage element,the terminal voltage control of the super capacitor is introduced,and the series voltage equalizing circuit of the single super capacitor is designed,and the simulation verification is carried out.Build the overall system simulation model,and build a hardware experiment platform.Using stm32f429 single chip microcomputer as the controller,output driving signals and sampling current and voltage signals,build the hardware circuit of the three-port converter and photovoltaic power generation device.According to the simulation and hardware experiment results,analyze The working characteristics have verified the feasibility of the system design.