摘要
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。
The same space voltage vector is chosen by Bang. Bang control in the traditional Direct Torque Control （DTC） system in the case of both big and small error. To solve the problem, it is proposed that the hysteresis and voltage vector table are replaced by a fuzzy controller, so as to increased torque dynamic respons speed and reduce the tlux and torque ripple. Fuzzy logic is intoduced. The errors on the torque and the stator flux linkage are fuzzy classified and the space voltage vector can be reasonable obtained according to the errors . Through fuzzy logic calculate, suitable space voltage vector is obtained to control induction motor. A design method of the fuzzy controller is presented particularly. Hardware and software design of the fuzzy direct torque control system is given. The results of simulation indicated that the response of the system is quicker when the motor start or the rotate speed breaks , torque and flux ripple is smaller, the dynamic and static performance is improved. ,good results in the occasions that require fast dynamic torque re- sponse
出处
《控制工程》
CSCD
北大核心
2013年第6期1023-1026,共4页
Control Engineering of China
基金
国家自然科学基金(60863004)
云南省应用基础研究面上项目(2010CD038)
