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安徽理工大学毕业设计
摘要
本文主要对交流异步电动机SPWM变频调速矢量控制系统进行建模与仿真。变频调速系统在异步电动机的各种调速方式中效率最高、性能最好，因此有着极其重要的地位。电气传动控制系统计算机仿真是应用现代软件工具对其工作特性进行研究的一种十分重要的方法。通过仿真试验，可以比较各种策略与方案，优化并确定相关参数。因此进行系统仿真是不可或缺的，为科学决策提供了可靠的依据。
本文介绍了交流调速系统概况、矢量控制的基本概念以及异步电动机变频调速系统在 MATLAB/Simulink仿真工具中模型建立以及特性研究。一方面，本文通过对交流异步电动机矢量控制调速系统各部分仿真，得出该系统各部分的运行特性；另一方面，通过对转矩内环的转速、磁链闭环矢量控制系统和转差频率控制的异步电动机矢量控制系统的仿真，熟悉了矢量控制系统的参数设置和工作特性。
本文通过仿真实验不仅了解和掌握了异步电动机运行特性，更重要的是得出的仿真数据，为新的实验设备的引进和进一步开发打下了坚实的基础。
关键词：矢量控制，仿真，数学模型
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安徽理工大学毕业设计
SIMULATION FOR FREQUENCY CONTROL SYSTEM OF ASYNCHRONOUS MOTOR BASED ON MATLAB
ABSTRACT
This paper mainly studies the modeling and the simulation about vector control system of the SPWM variable frequency control. Variable-frequency speed regulation is an efficient way of speed regulation. The computer simulation of the electric drive system is one of the most significant means in the science research. It works by establishing the simulation models and simulation experiments on computer repeatedly. By simulation, you can compare a variety of strategies and determine the relevant parameters. It is essential for system simulation, so as to provide a reliable scientific basis for decision-making.
This paper mainly introduces the development of AC regulating speed system, the main idea of Vector control, and how to establish simulation for frequency control system of AC motor based on MATLAB. On the one hand, this paper established models for AC motor and obtained some features of the system. On the other hand, by the simulation for vector control system of AC motor with speed and flux loop on torque loop and slip frequency control to understand the vector control system parameter settings and operating characteristics.
By simulation, for one thing, we understand and grasp the asynchronous motor operating characteristics. What’s more, simulation data has laid a solid foundation for the introduction of new experimental equipment and further development.
KEYWORDS：vector control, simulation, mathematical models
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安徽理工大学毕业设计
目录
摘要 .................................................................. I 目录 .................................................................. i 1 绪论 ................................................................ 1
1.1 概述 .......................................................... 1 1.2 交流变频调速技术的现状 ........................................ 1 1.3 仿真工具MATLAB/Simulink简介 .................................. 2 1.4 毕业设计的研究内容及章节安排 .................................. 3 2 基于动态模型的异步电动机调速系统工作原理 ............................ 4
2.1 异步电动机的数学模型 .......................................... 4 2.2 坐标变换 ...................................................... 7 2.3 异步电动机在两相坐标系上的数学模型 ........................... 11 3 交流异步电动机性能的仿真研究 ....................................... 13
3.1在交流情况下异步电动机工作仿真 ............................... 13 3.2 PWM变频器-电动机系统仿真 .................................... 15
PWM .......................................................... 16
4 交流异步电动机矢量控制调速系统仿真 ................................. 18
4.1 转矩内环的转速、磁链闭环矢量控制系统仿真及分析 ............... 18 4.2 转差频率控制的异步电动机矢量控制系统仿真 ..................... 24 4.3 两种矢量控制系统的特点与存在的问题 ........................... 27 结论 ................................................................. 29 参考文献 ............................................................. 30 致谢 ................................................................. 34
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