软件决定开关模式的永磁同步电机SVM-DTC仿真建模

Simulation and Modeling of Space Vector Modulation Direct Torque Control for Permanent Magnet Synchronous Motor Based on Software Determined Switching Pattern

研究了一种新的基于软件决定开关模式的永磁同步电机空间矢量调制直接转矩建模仿真方法。首先,由德州仪器TMS320C240数字信号处理器中关于空间电压矢量调制实现问题,分析了一种实现简单的空间矢量调制方式,即采用软件决定开关模式的空间矢量脉宽调制策略。该方法利用数字信号处理器上的常规比较功能实现对称的空间矢量脉宽调制波形模式,进而达到高性能的控制效果,同时保证功率器件开关频率恒定。将这种策略引入永磁同步电机磁场直接转矩控制之中,利用Matlab仿真平台建立整个控制系统的仿真模型并进行仿真和分析。与传统的建模方法相比,提出的建模方法更为简单有效,并可以快速应用到数字处理器之中。仿真结果表明新系统在保持了常规系统优异的动态性能的基础上转矩脉动和磁链脉动明显减小。

A simulation scheme was investigated on the simulation and modeling of space vector modulation direct torque control for permanent magnet synchronous motor based on the software determined switching pattern. The technique of space vector modulation（SVM） was analyzed on digital signal processor（DSP） of TMS320C24x/F24x. To simplify it, a simple SVM scheme of the software determined switching was proposed to improve the performance of traditional direct torque control of PMSM, which kept the switching frequency constant. A simulation model was constructed and simulated to realize the proposed scheme. Simulation results show the effectiveness of this approach. This method makes the torque and flux linkage ripple lower and current smoother dramatically and has a much better steady state performance while keeping a good dynamic performance compared with the basic one.