Research On Control Strategy Of Hybrid Excitation Bearingless Switched Reluctance Motor

The contradiction between resource consumption and environmental protection is increasingly prominent,and the study of new energy and energy-saving technology has become a hot trend.As a necessary part of the former,energy storage technology has also become one of the research hotspots.As a unique physical energy storage method,flywheel energy storage has its special advantages,for instance,high energy storage density,large instantaneous power,excellent charge-discharge performance and safe and reliable operation.Bearingless switched reluctance motor has the advantages of high integration and low loss,and is suitable for flywheel battery structure.The flywheel energy storage system with BSRM as the control core should have better control performance in order to achieve the characteristics of high speed,low pulsation and strong anti-interference.Therefore,it is of great theoretical significance and practical value to study its high-performance operation.In this paper,a novel hybrid excitation BSRM structure is proposed on the basis of the analysis of the existing BSRM topology.The key technologies of the new HEBSRM,such as the operating principle and mathematical model,coupling performance analysis,torque ripple suppression and ADRC,are studied and the experimental platform is designed.The emphasis of the thesis are as follows:(1)A new type of HEBSRM structure is proposed,which retains the excellent suspension performance under the traditional structure and has a more stable torque output capacity.The structure and operation principle of the motor are expounded,and its mathematical model is deduced and compared with the 3D FEM simulation data.The accuracy of the mathematical model is verified and the structural performance and coupling of the motor are analyzed by the finite element method.(2)The double salient pole and cogging structure of the motor will cause great pulsation during operation,based on the weak coupling of the motor structure,the direct force control strategy is used to resolve this problem.Simulation data verified the performance of the above strategy based on HEBSRM,which realizes the suppression of motor pulsation and improves the stability of motor effectively.(3)Considering the actual operating conditions,aiming at the problems of sudden disturbance and complex parameter change in the operation of BSRM,the active disturbance rejection control and direct suspension force control strategy is adopted for HEBSRM suspension system,and a closed-loop displacement controller is designed based on sliding mode algorithm and ADRC.On the basis of the above,the influence of measurement noise on the control system is considered,and the extended state observer is improved.In the case of noise suppression,the dynamic response and stability of the control system are integrated,and the availability of the proposed control strategy is carried out in Simulink.(4)In order to further verify the rationality of the motor structure design and the effectiveness of the algorithm,the prototype is manufactured and the d SPACE hardware-in-the-loop experimental platform is designed.The experiment verifies the performance of the designed motor and control algorithm,and provides the idea for the follow-up experiment.