无传感器运行的异步电机定子电阻辨识技术研究(论文12000字)
摘要
无传感器运行的异步电机传动系统的控制技术是当代电机控制的一个重要方向。在对电机进行控制的过程中，磁链的观测和估算是关键，但是磁链获取的准确性会受到电机各种参数变化的影响。本文重点是通过基于转子磁链的模型参考自适应理论，对对于磁链有着不可忽略的定子电阻进行辨识研究。
首先我们讨论了异步电机的工作原理，这是异步电机传动控制的基础。由于异步电机在三相坐标系中的数学模型具有极大的复杂性，因此我们利用左边变换理论将三相坐标系转换为两相静止坐标系，这就使得转换后的数学模型简化了很多。然后利用MATLAB中的SIMULINK组件根据推导出的数学模型搭建了异步电机磁链的观测模型并与实际磁链进行对比以证实模型的准确性。
对定子电阻进行观测的传统方法就是通过空转和堵转实验以得到电机的铁损、摩擦损耗、转子电阻、电感等信息。最后根据磁链方程和电压方程进行推导。但是这类方法需要外部设备并且表现出一定的不可靠性。本文是根据模型参考自适应法，以与定子电阻无关的转子磁链电流模型为参考模型，以与定子电阻有关的转子磁链电压模型为可调模型，通过自适应机构对定子电阻进行辨识。并通过仿真模型，对于其结果进行观测分析，具有极高的实用价值。
关键词：无传感器 异步电机 MRAS 定义电阻
Research on stator Resistance Identification Technology of Induction Motor in sensorless Operation
ABSTRACT
The control technology of sensorless asynchronous motor drive system is an important direction of modern motor control. In the process of controlling the motor, the observation and estimation of the flux is the key, but the accuracy of the flux acquisition will be affected by the various parameters of the motor. This paper focuses on the identification of stator resistance which can not be ignored by the model reference adaptive theory based on rotor flux.
First, we discuss the working principle of asynchronous motor, which is the basis of drive control of asynchronous motor. Because the mathematical model of asynchronous motor in the three-phase coordinate system has great complexity, we use the left-hand transformation theory to convert the three-phase coordinate system to the two-phase stationary coordinate system, which makes the converted mathematical model simplified a lot. Then the observed model of induction motor flux is built by using the SIMULINK module of MATLAB according to the mathematical model derived and compared with the actual flux to verify the accuracy of the model.
The traditional method of stator resistance observation is to obtain the information of iron loss, friction loss, rotor resistance, inductance and so on through idling and shutoff experiments in order to obtain the information of motor's iron loss, friction loss, rotor resistance, inductance and so on. Finally, the equations of flux and voltage are deduced. However, such methods require external equipment and show a certain degree of unreliability. In this paper, according to the model reference adaptive method, the rotor flux current model independent of stator resistance is taken as reference model, and the rotor flux voltage model related to stator resistance is used as adjustable model. The stator resistance is identified by adaptive mechanism. Through the simulation model, the results are observed and analyzed, which is of great practical value.
Key words: sensorless, asynchronous motor, MRAS, definition resistance
目录
摘要 Ⅰ
ABSTRACT Ⅱ
第一章 引言 1
1.1无传感器运行的异步电机定子电阻辨识研究的研究背景及意义 1
1.2国内外研究方法汇总 3
1.2.1在线辨识 3
1.2.2离线辨识 5
1.3论文章节安排和主要研究内容 5
第二章 感应电机工作原理及数学模型建立 7
2.1感应电机工作原理 7
2.2在三相静止坐标系下的异步电机数学模型 7
2.3坐标变换（Clark变换）和变换矩阵 10
2.4三相异步电机在目标坐标系下的数学模型 13
2.4.1转换后的磁链、电压方程 13
2.4.2基于转子磁链的电压模型 15
2.4.3基于转子磁链的电流模型 16
第三章 基于转子磁链模型MRAS定子电阻估算方法 18
3.1模型参考自适应基本思想 18
3.2Popov超稳定性理论 19
3.3自适应率的选取 24
第四章 仿真模型的搭建及仿真结果 21
4.1 silulink仿真搭建电压模块 24
4.2 silulink仿真搭建电流模块 24
4.3 silulink仿真搭建自适应模块 26
4.4仿真结果分析 28
第五章 总结与展望 30
5.1 全文总结 30
5.2 研究展望 30
参考文献 32 |
