感应电机DSVM直接转矩控制的DSP实现.doc

摘要:本文给出一种感应电机离散空间矢量调制直接转矩控制(DSVM-DTC)的数字实现方法,详细阐述了以TI公司的TMS320F2812作为控制器核心的直接转矩变频调速系统的软 、硬件设计方案。实验结果表明,DSVM技术可有效减小转矩脉动,改善电流和磁链波形,且保持了一般直接转矩控制方法转矩动态响应快的优点。
关键词:直接转矩控制;离散空间矢量调制;转矩脉动;TMS320F2812
The DSP implementation for DSVM direct torque control of induction motors
ZHANG lin-bao, ZHANG xing-hua, SUN zhen-xing
(College of Automation and Electrical Engineering, Nanjing University of Technology, Jiangsu 211816, China)
Abstract: A digital implementation method of discrete space vector modulation direct torque control (DSVM-DTC) system of induction motors is presented. The software and hardware design scheme of DTC driving system using the TMS320F2812 is investigated in details. The experiment results show that torque ripple are significantly reduced, the wareform of current and flux linkage are improved effectively and the technology of DSVM control keep the advantage of fast torque response of DTC.
Key words: direct torque control; discrete space vector modulation; torque ripple; TMS320F2812

直接转矩控制(DTC)是继矢量控制之后发展起来的一种高性能交流调速方法,具有系统结构简单、转矩动态响应快、参数鲁棒性好等优点[[] Takahashi Isao. A new quick-reaponse and high-efficiency control strategy of an induction motor[ J ]. IEEE Trans. Industry Applications, 1986, 22(5) : 820-827.
]。传统DTC采用滞环控制器把电磁转矩和定子磁链的检测值分别与它们的给定值作滞环的比较,根据比较的结果,通过查表方式选择基本电压矢量对电机转矩、磁链进行直接控制。该方法在一个采样周期内仅作用一个固定的电压空间矢量,在转矩误差较小的情况下,所选择的电压矢量使转矩在较短时间内就达到给定值,余下的时间逆变器开关状