【摘要】 为解决四开关逆变器驱动永磁同步电机的常规直接转矩控制(DTC)中磁链和转矩脉动较大、逆变器开关频率不恒定的问题,提出采用滑模控制器替代常规DTC中的滞环调节器以获得所需电压矢量,并采用空间矢量调制策略获得固定的逆变器开关频率。为避免常规滑模控制器输出抖动对系统性能的影响,引入了模糊控制器以平滑系统输出。仿真结果表明,采用该策略能有效抑制磁链和转矩脉动,同时能保持DTC系统固有的转矩快速响应特性和强鲁棒性。更多还原

【Abstract】 To solve those problems associated with the classic Direct Torque Control(DTC) of four switch inverter fed Permanent Magnet Synchronous Motor(PMSM),such as high flux and torque ripple and variable switching frequency problems,a novel sliding mode controller(SMC) was proposed to replace two hysteresis regulators in the classic DTC system to obtain the desired voltage vector the Space Vector Modulation(SVM) was used to ensure the fixed inverter switching frequency.A fuzzy controller was also employed in order to avoid the bad influence of the chattering problem of the SMC on the system performance. The simulation results verified that the proposed control scheme significantly reduces flux and torque ripple,preserves quickly dynamic torque response merit and shows good robustness.更多还原