基于DSP的异步电机直接转矩控制系统的研究与实现

发布时间：2018-01-22 18:24

本文关键词： 异步电机直接转矩控制磁链观测 TMS320F2812　出处：《重庆大学》2007年硕士论文　论文类型：学位论文

【摘要】： 近20年来,异步电动机直接转矩控制(DTC)以其简洁明了的结构,优良的静、动态性能,得到了极大的发展。它在定子坐标系下分析异步电机的数学模型,对电机参数不敏感,直接对电机转矩进行控制,对逆变器的开关进行最佳控制。本文在分析传统的直接转矩控制系统的基础上,提出了改进的直接转矩控制系统并进行了仿真,利用DSP控制平台实现了控制系统实验验证。定子磁链观测是DTC的关键技术,传统的u-i模型结构简单,但是积分器会将检测电流中的直流偏置累加。本文提出了一种新的定子磁链观测方法,即改进的层叠式可编程低通滤波器的定子磁链观测方法。它通过交换层叠式可编程低通滤波器环节和幅值补偿环节的顺序大大提高了层叠式可编程低通滤波器的动态性能,尤其是低速性能。本文采用PI调节器代替传统的转矩滞环比较器,采用磁链误差比例限幅控制器代替传统的磁链滞环比较器,并采用了新型的空间矢量电压选择方法,这就构成了改进的直接转矩控制系统。本文利用仿真软件Matlab/Simulink对改进的直接转矩控制调速系统进行了仿真,仿真结果表明改进的直接转矩控制调速系统具有可行性。 TI公司的TMS320F2812 DSP为电机控制提供了专用的内部外设,使电机控制系统的硬件设计大大简化,它强大的运算能力提高了电机的控制性能。本文采用C语言完成了有速度传感器的直接转矩控制系统的软件编写,实现了M/T法测速、定子相电流采样、定子磁链和电磁转矩的观测、空间电压矢量选择、SVPWM生成等功能。最后,本文在DSP电机控制平台上对改进的直接转矩控制调速系统的控制算法进行了实验,实验结果验证了系统控制方案正确性。
[Abstract]:In the last 20 years, direct torque control (DTC) of asynchronous motor is characterized by its simple structure and excellent static and dynamic performance. It analyzes the mathematical model of asynchronous motor in stator coordinate system and is insensitive to motor parameters and directly controls the motor torque. Based on the analysis of traditional direct torque control system, an improved direct torque control system is proposed and simulated. The DSP control platform is used to realize the experimental verification of the control system. Stator flux observation is the key technology of DTC. The traditional u-i model is simple in structure, but the integrator accumulates the DC bias in the detection current. In this paper, a new stator flux observation method is proposed. That is, an improved stator flux observation method for cascaded programmable lowpass filters, which greatly improves the performance of cascaded programmable lowpass filters by switching the sequence of the links of programmable lowpass filters and amplitude compensation links. Dynamic performance. In this paper, Pi regulator is used to replace the traditional torque hysteresis comparator, and flux error proportional limiting controller is used to replace the traditional flux hysteresis comparator. A new space vector voltage selection method is adopted, which constitutes an improved direct torque control system. In this paper, the simulation software Matlab/Simulink is used to simulate the improved direct torque control speed regulation system. The simulation results show that the improved direct torque control speed regulation system is feasible. The TMS320F2812 DSP of TI Company provides special internal peripheral equipment for motor control, which greatly simplifies the hardware design of motor control system. In this paper, the direct torque control system with speed sensor is programmed by C language, and the speed measurement and stator phase current sampling are realized by M / T method. Stator flux and electromagnetic torque observation, space voltage vector selection SVPWM generation and other functions. Finally, the control algorithm of the improved direct torque control system is tested on the DSP motor control platform, and the experimental results verify the correctness of the control scheme.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2007
【分类号】：TM343;TM921.5

【相似文献】