【摘要】 传统的三相感应电动机直接转矩控制(DTC)方案中由于使用了滞环比较器与开关选择表,使得逆变器开关频率不固定,并会造成电机输出转矩脉动过大的问题。针对上述问题,引入了一种基于定子磁链定向的空间矢量调制(SVM)直接转矩控制方案,并对参考电压矢量采用了5段式合成方案。最后,通过Matlab/Simulink组件对系统进行建模仿真,并分别与传统直接转矩控制系统和基于12扇区划分的直接转矩控制系统进行了对比。结果表明,该系统能够克服直接转矩控制系统的固有缺点,有效降低电机转矩与定子磁链的脉动。更多还原

【Abstract】 Using hysteresis comparators and switch-table,drawbacks like variable switching frequency andlarge torque ripple are caused in the conventional three-phase induction motor direct torque control(DTC)system.In this case,a space vector modulation(SVM)DTC system based on stator flux orientation using five-sectionsynthesis scheme for the reference voltage vector was proposed.Finally,the system was compared with theconventional DTC system and the system based on 12-sector by simulation through Matlab/Simulink.The resultsshow that the system can overcome the shortcomings in conventional DTC system and reduces the torque and statorflux ripple effectively.更多还原