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针对传统直接转矩控制系统DTC(Direct Torque Control)采用的Bang-Bang控制在误差偏大与偏小时选择相同的空间电压矢量的问题,提出用模糊控制器替换传统直接转矩控制系统中的滞环比较器和开关矢量表的策略,以实现提高转矩动态响应速度,减小磁链和转矩的脉动。引入模糊逻辑,将转矩误差、定子磁链误差和磁链角进行模糊分级,以便根据误差大小合理地选择空间电压矢量。对模糊变量进行模糊逻辑运算,得到合适的空间电压矢量对感应电动机进行控制。详细介绍了模糊控制器的设计。给出了模糊直接转矩控制系统的硬件和软件设计。仿真结果表明,系统在起动与转速突变时响应变快,转矩和磁链脉动减小,动、静态性能得到改善,应用在对转矩动态响应要求较快的场合有良好的效果。
Aiming at the problem that the Bang-Bang control adopted by the traditional direct torque control system (DTC) selects the same space voltage vector when the error is larger and smaller, a fuzzy controller is proposed to replace the traditional direct torque control system Loop comparator and switch vector table strategies to achieve increased torque dynamic response speed, reduce the flux and torque ripple. Fuzzy logic is introduced to classify the torque error, stator flux error and flux linkage angle in order to select the space voltage vector reasonably according to the error. The fuzzy logic fuzzy logic operation, get the appropriate space voltage vector induction motor control. Described in detail the design of fuzzy controller. The hardware and software design of fuzzy direct torque control system is given. The simulation results show that the response of the system is quicker when the starting and speed is abrupt, the torque and flux chain pulsation are reduced, the dynamic and static performance are improved, and the system has good effect when the dynamic response of the torque is fast.