Research On The Multi-objective Optimization Design Of Ocean Wave Switched Reluctance Linear Generator

First,the thesis introduces research status of wave power generation,basic principles,research status and prospects of linear generator.The thesis then summarizes structural characteristics of DSRLG and principle of reciprocating wave power generation.Based on rotary SRM design criteria and experience,the initial size of DSRLG is determined.Using finite element software FLUX,the thesis introduces electromagnetic calculation methods including 2D and 3D finite element simulation.By comparing their simulation results and time costs,the finite element modeling method adopted is determined and used in electromagnetic analysis of DSRLG.After that,with simulation of established finite element model and Simulink model,trends of power density of DSRLG with various dimensional parameters are obtained.The optimal size under single-objective optimization is determined.Afterwards,three significant indicators are selected as targets of multi-objective optimization.The sensitivity analysis of each structural parameter is performed,and key structural parameters are selected.Then multi-objective optimization algorithm is introduced based on improved entropy TOPSIS method.Following the optimization process,key structural parameters are optimized,and comprehensive evaluation value of each structural scheme are obtained.Considering factors such as manufacturing process and cost,the optimal dimension of DSRLG is finally determined.After that finite element simulations and Simulink simulations are performed between schemes before and after optmization,which means the dynamic performance comparison is conducted,to verify the effectiveness of the optimization process.Finally,a DSRLG prototype is manufactured,as well as a reciprocating linear power generation platform.To verify the static performance of DSRLG,the static flux at key positions and the static electromagnetic force during half a symmetrical mover cycle are measured and compared with the results obtained by simulation,which then well verify the static performance of DSRLG and the accuracy of the finite element model.Meanwhile,to verify the dynamic performance of DSRLG applied in reciprocating wave power generation,a dynamic experiment is performed under different DC excitation voltages using a combination of position control and current chopper control.The experiment results can well verify the dynamic performance of DSRLG and the accuracy of the established MATLAB / SIMULINK dynamic model.