【作者】 梁大强；

【导师】 李永海；

【作者基本信息】 吉林大学 ， 计算数学， 2008， 硕士

【摘要】 本文以三相感应电动机为研究对象,采用矢量控制技术,使得三相感应电动机拖动系统获得较高的动态特性。本论文首先对三相感应电动机数学模型的建立进行了详细的分析和阐述。通过对三相感应电动机动态电磁关系的分析以及坐标变换原理概念的介绍,建立了三相感应电动机在不同坐标系上的数学模型;之后,基于建立的三相感应电机的数学模型,对矢量控制原理进行了分析,设计了转子磁场定向的矢量控制系统,详细地分析了磁链观测器、磁通PI调节器,转矩PI调节器和转速PI调节器的工作原理,并设计了磁链观测器、磁通PI调节器,转矩PI调节器,转速PI调节器。最后,本论文运用MATLAB/SIMULINK对三相感应电动机和转子磁场定向矢量控制系统进行仿真,给出仿真结果,并对仿真结果进行了分析、验证。更多还原

【Abstract】 In order to obtain the high dynamic response, the high precision magnetic torque control of AC machine is essential. As we know the DC regulating speed system has its limitation since the existence of brush, while the AC machine is widely used with the rapidly development of computer technology and power electric technology. After over ten year’s development, the performance of variable frequency speed regulation control of asynchronous motor has excelled the performance of DC speed regulation control. The purpose of this dissertation is to establish a model of three phase inductive machine, based on the model, we can study various control theory.Vector control method is a new variable frequency speed regulation technology, which is more effective than SPWM technology. The basic ideal of vector control is to simulate the three phase inductive machine as a DC motor. The process depends on the analysis and studying on the mathematic model of inductive machine. In this thesis a mathematic model of three phase inductive machine is presented firstly, the model is established with MATLAB/SIMULINK. Then after doing the vector transform to the inductive machine model, we can get the decoupled model in two phases synchronous revolving reference frame. In the two phases synchronous revolving reference frame, the vector of stator current is decomposed into two components: the excitation parts which is overlapped to vector of rotor flux linkage and the torque parts which is vertical to vector of rotor flux linkage. By control the position and value of stator current vector in revolving reference frame, namely by control the field current part and the torque current part respectively, realizing the decoupled control of flux and torque just as the DC motor control.In this paper, a detailed analysis and depiction of three phase inductive machine model is presented. Through the analysis of dynamic electromagnetic relationship and the introduction of coordinate transform method, the mathematic model of three phase inductive machine in different reference frame was established. The typical characteristic of AC inductive machine is a multi-variable system featuring time-variant, nonlinear and strongly coupled parameters. In this paper, the particular of vector control principle and vector transform approach is presented and the uncoupling of three phase inductive machine model is also explained.In the thesis, a design of Rotor flux orientation control of three phase inductive machine is given, including the analysis and design of magnetic flux observer, magnetic flux PI regulator, torque PI regulator and speed PI regulator etc. In the end, the simulation research using the MATLAB/SIMULINK software is given. The simulation result show the model and the control method established in the paper is ideal.更多还原