基于空间矢量调制的PMSM直接转矩控制研究

摘要

Appear for the traditional direct torque control (DTC) switching frequency is not constant, flux and torque rippling, based on space vector modulation direct torque control (SVM-DTC) method. This method combines the fast response of direct torque control,vector control continuous smooth advantages,based on permanent magnet synchronous motor (PMSM) mathematical model, establish torque、flux dual closed-loop PI control loop.Using space vector modulation strategy, the torque and flux as the control amount. Simulation results show that, compared to traditional direct torque control, the switching frequency based on space vector modulation direct torque control scheme constant torque, flux ripple is small, the system has a good dynamic and static performance, validate the method feasibility and effectiveness.%针对传统的直接转矩控制（DTC）出现的开关频率不恒定，磁链和转矩脉动大的问题，提出一种基于空间矢量调制的直接转矩控制（SVM-DTC）方法。该方法集合了直接转矩控制响应快、矢量控制连续平滑的优点，以永磁同步电机（PMSM）数学模型为基础，建立转矩、磁链双闭环PI控制回路。采用空间电压矢量调制策略，将转矩和磁链作为控制量。仿真结果表明，相对于传统的直接转矩控制，基于空间矢量调制的直接转矩控制方案的开关频率恒定，转矩、磁链脉动小，系统具有良好的动、静态性能，验证了该方法的可行性和有效性。