Experimental exploration and research for DAB converters based on"Simulation,Semiphysical Simulation,and Physical Prototype"three-stage development
[Objective]Power electronic experimental teaching is a practical teaching technique helping students in power electronics understand the principle,design,and control technology of power electronics through experimental operation and practical application.This teaching technique combines theoretical knowledge with practical application to cultivate students'experimental skills,problem-solving ability,and innovative thinking.Current research and exploration of power electronic experimental teaching methods focus on designing various experimental platforms through which students perform operations such as circuit construction,parameter adjustment,signal acquisition,and performance testing to observe and verify the various characteristics and functions of power electronics practically.To explore a set of complete,efficient,low-cost power electronic experimental teaching methods with the dual active bridge(DAB)DC-DC converter as the object,a three-phase"Simulation,Semiphysical Simulation,and Physical Prototype"experimental platform is established.[Methods]The platform achieves the effective connection of theoretical analysis,model construction,simulation research,and experimental investigation.The time-domain and frequency-domain models of the DAB converter under triple-phase-shift modulation are examined in detail,and the inductor current stress optimization scheme and current RMS optimization scheme are presented.A three-phase experimental platform,including MATLAB/Simulink simulation platform,FPGA semiphysical simulation platform,and physical prototype platform,is designed and built.[Results]This platform can troubleshoot and solve the system problems before the physical test,which effectively reduces the development risk,minimizes the development cost,and improves the development efficiency.In the MATLAB/Simulink simulation platform,two inductor current optimization schemes of the DAB converter are theoretically verified,and the parameters are optimized through virtual experiments.In the FPGA semiphysical simulation platform,the main circuit of the DAB converter is placed in the simulation environment,the code in the MATLAB/Simulink simulation platform is ported to the digital signal processor,and the sampling,control,and driving functions are determined using DSP,which can debug,verify,and evaluate the system before the deployment of the physical system,and discover and solve the potential problems at an early stage.In the physical prototype platform,real experimental operation and data acquisition are performed based on the debugged DSP to confirm the application effect of the optimized control strategy in real circuits.[Conclusions]The proposed inductor current optimization scheme is evaluated in the simulation,semiphysical simulation,and physical prototype platforms.Results show that the experimental outcomes of different platforms are highly consistent,verifying the effectiveness and feasibility of the three-stage development.Only the DAB converter is used as the experimental object,and the platform also applies to developing other power electronic converters.Through the training of the three-stage experimental platform,students can slowly enhance their theoretical analysis ability,simulation verification ability,and practical operation ability in the field of power electronics.Moreover,the platform is economical,safe,and practical in development.This comprehensive teaching method will help foster students'innovative thinking and practical ability and lay a solid foundation for their future research and work in power electronics.
dual active bridge converteroptimized control strategysimulationsemiphysical simulationexperimental platform design
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