Research And Implementation Of Twophase Interleaved Parallel BOOST Converter Based On PI-model Predictive Control Method

With the increasing global climate issues and the increasing contradiction between energy supply and demand,new energy sources that meet the concept of sustainable development have become the focus of research.In the fields of new energy automobile,distributed generation,and Micro-Grids,power systems play an increasingly important role by functions of their energy storage,conversion,and regulation.Among them,the switching power supply with DC/DC converter as the core has been widely used due to its high frequency,high power density,high dynamic performance and high gain.So an interleaved parallel structure has been designed in this project,based on the BUCK/BOOST converter topology which is widely used in practice,and works on the medium-power two-phase interleaved parallel BOOST converter control system.In this thesis,the system mathematical model and control strategy have been deeply analyzed,and the control algorithm optimization design and system level implementation have been done based on the traditional control strategy.Firstly,based on the research on the topology and control method of DC/DC converter,a two-phase interleaved parallel BOOST converter control system is constructed.The working principle of two-phase interleaved parallel BOOST converter is described and its performance analysis is carried out through theoretical calculations.Secondly,the control strategy of two-phase interleaved parallel BOOST converter is analyzed,and then the different control structures of two traditional control strategies are designed.The simulation model of two-phase interleaved parallel BOOST converter control system is built in Matlab/Simulink simulation software.The simulation experiments under different operating conditions of the system under two control strategies are completed.Thirdly,for the robustness of two-phase staggered parallel BOOST converter under different working conditions,the model predictive control strategy is used to improve the dynamic response performance of the system.Based on this analysis,a converter optimization control strategy is designed.A large number of simulation results fully prove the correctness and superiority of the control strategy.Finally,according to the system topology,a two-phase interleaved parallel BOOST converter control system is designed and implemented;and the comparative operation experiment under different control methods was completed by relying on the experimental platform of 1kW two-phase interleaved parallel BOOST converter control system.The final experimental results are consistent with the theoretical analysis and algorithm simulation results,which proves the correctness and reliability of the twophase interleaved parallel BOOST converter control system designed and implemented.It also fully shows that the optimized PI-model predictive control algorithm can significantly improve the control effect of the system and realize the optimization of system performance.