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摘要 随着现代社会工业的不断发展，交流调速系统已经被广泛的应用于各行各业中，因其具有诸多优点，促使交流电机调速系统的控制技术成为研究热点。加上电力电子器件和高性能微控制器的不断发展，相继出现了多种交流异步电动机变频调速方案，其中基于异步电动机动态数学模型的按转子磁链定向控制 （FOC）和直接转矩控制（DTC）两种控制方案最为突出。 直接转矩控制系统简称 DTC 系统，与按转子磁链定向控制系统相比，不需要进行矢量变换等复杂运算，也不需要对电动机的动态数学模型进行简化以使其等效为直流电动机，具有控制结构简单和原理明确的优点，且高动态的电磁转矩响应，使得调速控制系统实时性得到了提高。因此，本课题的研究内容是使用直接转矩控制方法设计基于DSP的变频器。 本文首先介绍了交流异步电动机调速技术的发展、变频器的发展与现状以及直接转矩控制技术的研究概况；建立了异步电动机的动态数学模型，并在此基础上分析了直接转矩控制的控制原理， 建立了直接转矩控制系统并详细分析其各个组成部分的工作原理；采用模块化的整流器、IPM 等设计了变频器的主电路和控制电路；以 TI 公司的TMS320F28335 芯片为控制器编制了控制软件， 实现对电压及电流的采集与处理，转矩、转速的计算及控制等；最后通过建立 DTC仿真模型并给出相应的仿真结果证明系统设计的理论可行性、对设计的变频器软硬件进行调试，实现一个完整的实际控制系统。58588
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毕业论文关键词：直接转矩控制；变频器；DSP Abstract With the continuous development of modern industrial society, the AC drive system has been widely used in various industries, because of its many advantages, prompting the AC motor speed control system become a hot topic. Coupled with the continuous development of power electronics and high-performance microcontrollers, it has appeared in a variety of AC induction motor frequency control scheme in which the dynamic mathematical model based on asynchronous motor by rotor flux oriented control (FOC) and direct torque control (DTC) two control schemes most prominent. Direct Torque Control System Acronym DTC system, compared with the press rotor flux oriented control system, transform vector does not require complex operations, nor the need for dynamic mathematical model of the motor can be simplified to make it equivalent to a DC motor, having simple control structures and principles of clear advantages, and high dynamic response of the electromagnetic torque, making real-time speed control system has been improved. Therefore, the content of this project is to use the method of direct torque control to design inverter based on DSP. This paper firstly introduces the development of AC asynchronous motor speed control technology, the development and current situation of inverter and the research situation of direct torque control technology; The establishment of a dynamic mathematical model of the asynchronous motor, and on the basis of analysis of the control principle of direct torque control, the establishment of direct torque control system and detailed analysis of the works of its various components; The main circuit and control circuit of inverter are designed by using modular rectifier and IPM; he control software is programmed by TMS320F28335 chip of TI company, the acquisition and processing of voltage and current, the calculation and control of torque and speed are realized; Finally, the DTC simulation model is established and the corresponding simulation results are given to prove the theoretical feasibility of the system design. The design of the inverter hardware and software debugging, to achieve a complete practical control system.
Keywords: DTC; Inverter; DSP