Research On Control Strategy Of Dual-PWM Permanent Magnet Synchronous Power Drive System

With the development and progress of science and technology,the appearance of integrated design of motor body and motor control technology is becoming more mature,the tank,armored vehicles and other special vehicle transmission mode from the mechanical transmission gradually to the direction of the electric drive.The electric drive mode of special vehicle,its system in essence is d ual-PWM permanent magnet synchronous power drive system,so this paper chooses dual-PWM permanent magnet synchronous power drive system as the research object.The research on the control strategy of the permanent magnet synchronous power generation subsystem,the permanent magnet synchronous speed regulation subsystem and the whole dualPWM permanent magnet synchronous power drive system,which has important reference value and research significance.First of all,this paper introduces the operating principle of dual PW M permanent magnet synchronous power drive system,and according to the principle of coordinate transformation,the mathematic model of the ABC coordinate system of Permanent magnet synchronous motor is transformed into the ?? coordinate system,and then transformed into dq coordinate system.Based on the mathematical model,the operating characteristics of the the permanent magnet synchronous power generation subsystem and the operating characteristics of the permanent magnet synchronous speed regulation subsystem are deduced,which lays a theoretical foundation for the following research.Then,aiming at the shortcoming of the traditional vector control strategy of the permanent magnet synchronous power generation subsystem in the dual-PWM permanent magnet synchronous power drive system,the current internal mode decoupling controller is designed.In order to verify the feasibi lity of the control strategy,the contrastive experiment with the traditional vector control is carried out.In order to verify the robustness of the system to its own parameters,change the parameters of the system,and the contrastive experiments is carried out.The simulation results show that the internal model decoupling control not only improves the dynamic and static performance of the system,but also enhances the robustness of the system and facilitates the debugging of parameters.Then,aiming at the shortcoming of the traditional vector control strategy of the permanent magnet synchronous speed regulation subsystem in the dual-PWM permanent magnet synchronous power drive system,the sliding mode control method is introduced in permanent magnet synchronous speed regulation subsystem,and the speed sliding mode controller and current sliding mode controller are designed respectively.In order to verify the feasibility of the control strategy,the contrastive experiment with the traditional vector control is carried out.In order to verify the robustness of the system to its own parameters,change the parameters of the system,the contrastive experiment is carried out.It can be obtained from the simulation results that the sliding mode control improves the dynamic and static performance of the system and enhances the robustness of the system.Finally,the torque observer is designed according to the model reference adaptive principle,and its dynamic and static performance is verified by simulation.In order to solve the problem of the DC bus voltage fluctuation of the tradition al dual-PWM permanent magnet synchronous power Drive system,a torque feedforward control strategy is presented,that is the load torque information of the permanent magnet synchronous speed regulation subsystem is fed forweed to the permanent magnet synchronous power generation subsystem.In order to verify the feasibility of the control strategy,for two different control strategies of the system,the control performance of the system is compared before and after introducing the torque feedforward control.And the simulation results are obtained,the dual-PWM permanent magnet synchronous power drive system adopts no matter the traditional vector control or the internal model control strategy and the sliding mode control strategy,the introduction of the torque feedforward makes the voltage fluctuation of the DC bus greatly reduced and the response speed is faster,so the control precision of the system is improved obviously.