基于SVPWM技术的交流调速的仿真研究_自动化专业论文
发布时间：2015-01-18
来源：人大经济论坛
自动化专业论文范文
目 录
摘 要I
1 绪论1
1.1 交流电气传动技术的发展现状1
1.1.1 交流调速系统的现状1
1.1.2 脉宽调制技术在交流调速中的应用现状2
1.2 MATLAB计算机仿真3
1.2.1 MATLAB仿真软件简介3
1.2.2 MATLAB下的SIMULINK软件包3
1.3 本论文研究的意义及任务4
2 交流调速控制方式和异步电机数学模型5
2.1 异步电机调速的基本控制方式5
2.2 异步电机数学模型6
2.3矢量控制系统的基本思想10
2.4 按转子磁场定向的矢量控制的实现11
3 电压空间矢量脉宽调制技术15
3.1 变压变频调速系统中的脉宽调制技术15
3.2 正弦波脉宽调制技术15
3.3 电压空间矢量脉宽调制技术16
4 SVPWM下的VVVF的仿真25
4.1 异步电机矢量控制方式下的仿真模型25
4.2 SVPWM的MATLAB仿真模型25
5 结论30
摘 要
随着半导体技术的快速发展，特别是数字信号处理器的出现，以及精确的异步电机模型和各种先进的控制策略的提出，很大的促进了电机控制的发展，使得精度高、调速范围宽、控制性能好的电机控制器的实现成为可能。 矢量控制作为一种先进的控制策略，是在电机统一理论、机电能量转换和坐标变换理论的基础上发展起来的，具有先进性、新颖性和实用性的特点。其思想就是将异步电动机的模型通过坐标变换，使之成为直流电动机模型，将定子电流矢量分解为按转子磁场定向的两个直流分量并分别加以控制，以期达到直流电机的控制效果。 本文介绍了交流变频调速的发展概况，异步电机的矢量控制策略，详细介绍了SVPWM 技术的原理，对SVPWM 技术进行了深入的分析和研究，并给出了一种新型的SVPWM 的实现算法。 通过MATLAB / SIMULINK 仿真软件，根据矢量控制原理，给出了基于SVPWM 的异步电机变频调速原理图，构建出各个功能实现的子模块，并设计了各个子模块的参数，结合SVPWM 算法，得到基于SVPWM 的异步电机变频调速仿真模型，进行了仿真实验，得出实验结果并对结果进行了分析。
关键词：矢量控制；变频调速；MATLAB / SIMULINK ； SVPWM
Abstract
With the development of semiconductor technique, and the TMS320LF2407 DSP controller, the accurate asynchronous motor model and all kinds of advanced theories that have resulted in the development of a highly reliable drive with highly accurate and variable speed controls. Vector Control System (VC) is one of the advanced theories, which is based on motor unification principle, energy conversion and vector coordinate transformation theory, It has many advantages such as novelty, practicability and advancement, By transforming the model of AC motor to DC motor, the stator current is decomposed into two DC parts which are orientated towards the rotor magnetic field and controlled respectively. Thus the magnetic flux and torque are decoupled. In which way, it controls the asynchronous motor in a synchronous way. This thesis introduces the correlative information of variable frequency speed regulating, vector control system of asynchronous motor, and expatiate Space Vector Pulse Width Modulation (SVPWM). The principle of SVPWM is in - depth discussed, and the algorithm for SVPWM is ratiocinated. By using MATLAB / SIMULINK dynamic simulation software, through the principle of the vector control system, get the structure model of variable frequency speed regulating system of asynchronous motor based on SVPWM, given all the detailed subschema and plan all the data, using the algorithm for SVPWM, the simulated model of variable frequency speed regulating system fed by SVPWM inverter is set up for asynchronous machine. Through the simulated model, get the result and analyzed it in detail. On the side of software, the module software is written by assembly language and C code so that can be amended and replanted easily.
Key Words : Vector Control ；Variable Frequency Speed Regulating; MATLAB / SIMULINK; Space Vector Pulse Width Modulation
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