| With the environmental pollution and the lack of resources,the state attaches more and more importance to energy conservation and emission reduction,so electric vehicles have been widely used.Double three-phase PMSHM bas been gradually applied in electric vehicle powertrain due to its advantages of high efficiency,small volume and high-power density.The control of driving motor has become a project supported by countries all over the world.Supported by the national natural science foundation of China(U1564201)and Jiangsu outstanding youth project(BK20180046),this thesis mainly puts the research on the mathematical model,field-orientated control,model predictive current control(MPCC),model predictive torque control(MPTC)and rapid control prototype development platform of double three-phase PMSHM into force.The contents of this thesis consist of the following six parts:1.The structure type and basic working principle of the double three-phase PMSHM are described.Three decoupling mathematical models of the motor are derived.The basic vector control and SVPWM technology of the double three-phase PMSHM are discussed,which lays a theoretical basis for the subsequent research.2.In order to reduce the current harmonics of double three-phase PMSHM,60 active voltage vectors and 4 zero voltage vectors generated by the six inverters were combined into 24 auxiliary voltage vectors according to certain rules,so as to reduce the interaction between the active voltage vectors.The model predictive control strategy and its various classifications are described in detail,and the auxiliary voltage vector is applied to model predictive current control.Through the establishment of the prediction model,the prediction current error correction,the selection of the prediction voltage vector and other modules to achieve a relatively novel model prediction current control,finally reduce the current harmonics,improve the quality of the current.3.After establishing the auxiliary voltage vector,it is introduced into the double three-phase PMSHM model predictive torque control.By optimizing the predictive model,the determination of the flux weight coefficient in the cost function is eliminated,which greatly reduces the complexity of the algorithm and reduces the calculation cost.At the same time,by introducing the auxiliary voltage vector and combining it,the current harmonic is reduced.Finally,the effectiveness and practicability of the proposed method are proved by comparing the response effect of DTC with that of MPC.4.Based on dSPACE Autobox,the rapid control prototype development platform of double three-phase PMSHM was established,mainly including the construction of software system and the design of hardware platform.The construction of software system includes function design,off-line simulation,model transplantation,configuration interface,algorithm compilation and download,on-line test,parameter setting and so on.The design of hardware platform mainly focuses on the plan of inverter driving voltage signal conditioning board.5.The model predictive current control and model predictive torque control strategies proposed in this thesis are verified by the rapid prototype development platform.The final results show that the two control methods can achieve excellent control effect in the double three-phase PMSHM.At the same time,it is verified that the rapid control prototype development platform can meet the requirements of double three-phase PMSHM. |
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