基于SVPWM技术的交流调速的仿真研究

论文编号:ZD850    论文字数:16613,页数:37

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

 
 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