摘要随着时代的发展，科学技术也不断地在发展，而直接转矩控制系统就是科学技术进步的一种体现，并且因为它的简洁直接的系统结构，直接转矩控制系统的性能比较良好，所以在现实生活，能够符合许多领域的要求。68760

那到底什么是直接转矩控制系统呢？直接转矩控制系统有什么含义呢？其实直接转矩控制的意思可以分为两层，直接控制转矩是直接转矩控制的第一层含义，对转矩的直接控制是直接转矩控制的第二层含义。直接转矩控制技术是通过分析空间矢量的方法。那么如何通过直接转矩控制系统得到较好的转矩响应和较好地控制呢？就是通过采用定子磁链的矢量控制的方法来控制电动机的磁链和转矩，这样就可以减少逆变器开关的频率和开关的次数，来获得电动机较高的动态性能的转矩响应。

在MATLAB仿真中具体分析了磁链滞环产生的变化对系统控制性能的影响，本文通过对MATLAB仿真实验结果的分析,得出来的结果是，本文所设计的系统模型是比较成功的，实验结果还是令人比较满意的。

本文通过对MATLAB仿真的模型进行分析，从而确定了系统的定子磁链模型。试图通过对MATLAB仿真的结果来实现对磁链轨迹的观测，并且检测是否达到预想的控制要求，同时通过磁链轨迹来观察直接转矩控制系统的效果。

毕业论文关键词：直接转矩控制  MATLAB仿真 电压空间矢量 定子磁链 逆变器

MATLAB SIMULATION RESEARCH ON DIRECT TORQUE CONTROL OF AC INDUCTION MOTOR

ABSTRACT

Direct torque control technology is a new technique that is used to control the motor, and system because of its simple structure, good dynamic and static performance has received the widespread attention and rapid development.

Direct torque control of direct torque control is the most basically see the effect. In fact, the meaning of it consists of two layers, one is the direct torque control, the other is the direct control of counter rotating moment. Direct torque control technology is through the space vector analysis method, is through the calculation of directly under the static coordinate system, and through the flux linkage and torque control of ac motor, the stator flux oriented vector control method, thus to inverter switch state for the best control, to achieve high torque response of the dynamic performance.

In the simulation of concrete analysis of the flux hysteresis changes affect the performance of system control, analysis and Matlab simulation results, in this paper, the designed system model is successful, has a satisfactory experimental result.

By according to the principle of direct torque control method, based on the analysis of the mathematical model of asynchronous motor, in this article, through analysis of MATLAB simulation model to analyze the stator flux model is determined. This paper attempts to achieve the observation of the trajectory through the MATLAB simulation, and to check whether to achieve the desired control requirements, and to test the effect of direct torque control.

Key words: Direct Torque Control MATLAB Simulation Voltage space vector Stator magnetic chain Inverter

目录

1.引言1

1.1交流异步电动机的调速方法-1

1.2直接转矩控制系统的特点和问题-1

1.2.1直接转矩控制系统的特点2

1.2.2直接转矩控制系统的问题2

1.3交流异步电机的应用-2

1.4直接转矩控制系统的发展-3

2.直接转矩控制系统的概述4

2.1异步电动机数学模型-4

2.2坐标变换-6

2.3电压空间矢量-9

2.3.1空间矢量的定义9

2.3.2电压与磁链空间矢量的关系9

2.4逆变器14

2.5直接转矩控制系统15