Modeling And Optimization Of The Control Strategy Of Four-phase Interleaved Paralle Boost Converter

More and more attention has been paid to the fuel cell electric vehicles for their cleanness and high efficiency.Boost converter,which is closely related to fuel cells,has also become the focus of research in the field of power electronics.Moreover,with the development of the times,the traditional single-phase Boost converter can no longer meet the higher and higher requirements for applications.Multiphase interleaving parallel technology is widely usedbecause of its ability to solve the above problems.In this paper,four-phase interleaved Boost converter is taken as the object,and its modeling and control strategy optimization are studied.In the interleaved main circuit topology,the working principle of four-phas interleaved Boost converter and its working modes under different duty cycles were analyzed.Steady-state analysis was carried out to determine the influence of duty cycle on input current ripple and output voltage ripple,and transient analysis was carried out to determine the influence on dynamic response under different duty cycles.They proved that the interleaving parallel technology can effectively reduce the output ripple and improve the efficiency of the converter.The state space method was used to model and analyze the four-phase interleaved Boost converter,and its state space variable model and system transfer function were obtained to provide support for subsequent strategic control.Aiming at the problems of slow response speed,large overshoot and weak anti-interference when traditional PID control is applied to systems with strong nonlinear factors,this paper optimized the traditional PID control algorithm by single neuron PID control algorithm,so as to improve the converter performance.Finally,the switching sequence of the converter,the variation of input and output ripple,and the dynamic response performance of the PID control and single neuron PID control to different disturbances were simulated by MATLAB/SIMULINK.Moreover,a25 kW prototype is built to draw the efficiency curve of the prototype under different input powers.The results show that the four-phase interleaved Boost converter prototype can reach 97.78% at the rated power.Therefore,the four-phase interleaved Boost converter studied in this paper has the characteristics of low ripple and high efficiency,which can effectively improve the service life of fuel cells and is applicable for the field of fuel cell vehicles.