Research On Wide Speed And High Performance Control System Of A New Dual-Stator Hybrid Excitation Machine

With the increasingly serious global problems such as energy crisis,environmental pollution and climate change,electric vehicles(EVs)are favored by governments of all countries for the advantages of low pollution,low noise,energy saving and high efficiency.In recent years,the permanent magnet synchronous motor(PMSM)as the driving motor of electric vehicles has become a research hotspot of domestic and foreign scholars.However,the permanent magnet flux of traditional PMSM cannot be adjusted,and its speed regulation capacity is limited.It is easy to cause irreversible demagnetization of permanent magnet when flux weakening control is adopted.The above two shortcomings limit its application in EVs.The dual-stator hybrid excitation machine studied in this paper combines consequent-pole,dual-stator structure and hybrid excitation with the following advantages:(1)NS consequent-pole structure is adopted in the rotor,which can save the consumption of rare earth permanent magnet materials;(2)The dual-stator structure separates the excitation winding from the armature winding,reduces the coupling between winds,and simplifies the structural design of the machine;(3)The excitation winding is located on the inner stator,and the design of AC excitation can avoid brushes and slips,which improves the reliability of the machine;(4)By means of hybrid excitation,the external air gap magnetic field can be easily adjusted and the speed range of the machine can be widened.In this paper,the wide speed and high performance control system of the new dualstator hybrid excitation machine is studied.First of all,the background and significance of this research is described.The topology and control strategy of the hybrid excitation machine are discussed and summarized.Then,the topology and basic operating principle of dual-stator hybrid excitation machine are analyzed,and the mathematical model of inside and outside stator are established.Besides,motor parameters are measured off-line for deadbeat current predictive control.Secondly,a dual-space vector control strategy combined with a five-phase dual-space adjacent fourvector SVPWM modulation strategy for five-phase motor is proposed,the fundamental current and the third harmonic current are controlled independently,so as to suppress the third harmonic current.Then,the principle and derivation process of traditional deadbeat current predictive control are introduced in this paper to improve the control performance of fundamental current.The key issue of deadbeat current predictive control is its parameter sensitivity.Then,an extended state observer is introduced to observe the current and voltage disturbance,and the voltage disturbance is feedback to the control voltage as a compensation,so as to improve the robustness and steady-state accuracy of the deadbeat current predictive control algorithmFurthermore,the dual-stator field weakening control strategy is studied,and the running state of the motor is divided into three regions.In region I,the armature winding is controlled by MTPA,and the excitation winding can be used for magnetization according to the load.In region II,the armature winding adopts negative direct axis field weakening control to improve the speed range;In region III,the excitation winding and armature winding are applied simultaneously to adjust external air gap magnetic field,so the moto has a winder speed range compare with region II.Finally,based on MATLAB/Simulink,the simulation model of the drive control system of the dualstator hybrid excitation machine is built to verify the proposed control strategy in this thesis.Then,the experimental platform is developed based on TMS320F28335,the effectiveness and feasibility of the proposed control algorithm is verified through experiments.