一种基于SVPWM的永磁同步电动机直接转矩控制系统仿真实验研究

Modeling and Simulation of PMSM DTC System Using SVPWM

传统的直接转矩控制存在转矩脉动大、开关频率不恒定等问题。为此在分析永磁同步电动机(PMSM)数学模型的基础上,对一种基于SVPWM的PMSM直接转矩控制系统进行了研究,利用Matlab/Simulink工具软件建立了系统的仿真模型。系统用PI调节器取代了传统DTC方式中的滞环环节,用SVPWM单元取代了开关表。仿真和实验结果表明控制系统的性能得到了显著改善,证明了模型的有效性。

There are several problems in the conventional direct torque control （DTC） system such as large torque-ripple, inconstant inverter switching frequency. At the basis of analysis of permanent magnet synchronous motor （PMSM）, this paper proposes a DTC system using space vector pulse width.modulation （SVPWM） for PMSM and model in the Matlab/Simulink. The model adopts PI controllers instead of relay unit, and the inverter is controlled by the SVPWM technique instead of switching table. The model simulation results indicate the validity of the proposed DTC system for PMSM, and the proposed method can improve the performance of DTC system.