Analysis And Control Of Isolated Three Port DC-DC Converter

Isolated three port DC-DC converter is one kind of the DC-DC converter,every port of the isolated three port DC-DC converter is connected to the three windings high frequency transformer,thus the three port converter is galvanic isolated,and can match the voltage of each port through adjust the turn ratio of the transformer conveniently.Isolated three port DC-DC converter can be used in renewable energy generation systems,hybrid electric vehicles,fuel cell vehicles and other application,it is one of the research hotspots of the DC-DC converter recent years.This paper analysised the principle and the working mode of the Isolated three port DC-DC converter,and derivated the power formula on the basis of calculating the power of dual active bridge converter.Feedforward decoupling control method is used in the control because of the decoupling of the converter and the Virtual resistance is used to eliminate the Resonant current.The simulation is done to prove the usage of the Feedforward decoupling control and Virtual resistance.Classical control method has a problem that it relies on the electrical model witch usually can't be established very accurately in practical work.What's more,the electrical model is not adaptive when the steady working point or the electrical parameters changed.To solve the problem,the robust control is proposed and the H_? control is used in controlling the isolated three port DC-DC converter.The Simulink simulation is done to compare with the classical control.The result indicate that the H_? control can improve the robustness of the system.At last,the experiment is completed to verify the correctness of the theory.The experiment used a control board with both STM32F4 and FPGA.After the experiment,the control is proved to be useful...