Research On Optimal Control Strategy Of Bidirectional Full-Bridge DC-DC Converter

With the development of national industry and the progress of science and technology,the problem of new energy power generation system and energy-saving power supply that to reduce cost and enhance efficiency is prominent.Bidirectional full-bridge DC-DC converter could achieve Bidirectional transmission,It not only plays an important role in DC transmission and distribution network,but also is widely used in fuel cell electric vehicle,space power supply system,UPS and distributed generation system.However,the current application of bidirectional full-bridge DC-DC converter still has some problems,such as high inductance current stress,large power return,limited soft switching range,which makes the low converter system inefficient and high switching loss.It has studied and analyzed that the working principle and mode of bidirectional full-bridge DC-DC converter under single-phase and dual-phase shift control,established the mathematical model and analyzed the power characteristics of the converter under two control modes.Then,Constrained by the transmission power in the converter,The Lagrange function is constructed to optimize the inductance current stress in the system.Then provide the control algorithm of converter under Two control modes.Through comparative analysis,it is concluded that the power characteristics of bidirectional full-bridge DC-DC converter under dual-phase shift control is better than that under single-phase shift control.Finally,The control strategy is improved that aiming at the problem of high inductance current stress of bidirectional full-bridge DC-DC converter,and propose a dual-phase shift control optimization algorithm strategy.The real-time calculation of the optimal shift is based on the minimum inductance current stress of the converter.The control strategy block diagram is given.Built the MATLAB/Simulink simulation model and low-power experimental prototype to verify the control strategy.The results of the simulation and experimental prove the effectiveness of the optimal control strategy adopt in this paper.Figure [62] table [7] reference [64]...