基于空间矢量PWM的新型直接转矩控制系统仿真

Simulation of Novel DTC System Based on Space Vector PWM

针对传统的直接转矩控制(DTC)转矩脉动大、开关频率不恒定等问题,在分析永磁同步电机(PMSM)数学模型的基础上,提出了一种基于空间矢量脉宽调制(SVPWM)技术的新型直接转矩控制系统,并利用MATLAB仿真软件建立了系统模型。该系统采用PI控制器调节磁链和转矩,逆变器由SVPWM控制。仿真结果表明该直接转矩控制系统设计是正确的,并能有效减小磁链和转矩脉动,改善控制系统的性能。

To solve the problems of large torque ripple and inconstant inverter switching frequency in the conventional direct torque control （DTC）, a novel DTC method using space vector pulse width modulation （SVPWM） was proposed based on the analysis of PMSM model and modeled in the MATLAB. Two PI controllers regulate theflux and torque respectively and the inverter is controlled by the SVPWM technique in the proposed DTC system. Simulation results show the validity of the proposed DTC system. The DTC system can effectively reduce the flux and torque ripple and improve the performance of control system.