《感应电动机的无速度传感器直接转矩控制系统仿真研究》.docVIP

感应电动机的无速度传感器直接转矩控制系统仿真研究 摘要 随着电力电子技术、计算机技术和自动控制技术的飞速发展，各类电机控制技术不断得到发展。其中直接转矩控制技术(DTC)作为继矢量变换控制之后又一项新型的现代交流调速控制技术，其思路是把交流电机与逆变器看作一个整体对待，采用空间电压矢量分析方法进行计算，免去了矢量变换的复杂计算。控制系统具有结构简单，鲁棒性强、静动态性能好、便于实现全数字化等到优点，所以得到了越来越广泛的重视。 本论文从异步电动机的数学模型以及坐标变换出发，并根据直接转矩控制的基本原理，详细分析了直接转矩控制系统的磁链计算以及磁链和转矩控制模块，另外还对无速度传感器技术进行了一定的研究，并提出了一种模型参考自适应法的速度辨识器，并运用Matlab/Simulink软件对基于MARS的无速度传感器直接转矩控制系统进行了仿真研究。并通过对磁链与转矩的计算实现了感应电机转速的直接转矩控制。 根据系统仿真结果图，我们可以看出这种速度辨识方法对给定转速的跟踪性能良好，超调较小，突加负载对转速的影响不大，能很快跟踪到给定转速。由此验证了该直接转矩控制系统模型相对于传统直接转矩控制的正确性和可行性。 关键词:异步电机，直接转矩控制，无速度传感器，基于MARS的速度辨识，定子电阻估算器Speed ??sensorless Direct Torque Control of Induction Motor System Simulation Abstract With the power electronics technology, computer technology and automatic control technology, the rapid development of various types of motor control technology continues to develop. Where direct torque control (DTC) as a vector control following the later a new type of modern AC speed control technology, the idea is to AC motor with inverter treated as a whole, using the space voltage vector analysis method calculation, eliminating the vector transform complex calculations. Control system has a simple structure, robustness, static and dynamic performance, easy to implement fully digital until advantages, has been more widely appreciated. And through the calculation of flux and torque induction motor speed to achieve a direct torque control. In this paper the mathematical model from the asynchronous motor as well as coordinate transformation departure, and in accordance with the basic principles of direct torque control, a detailed analysis of the direct torque control system flux calculations and flux and torque control module, and also on the speed sensor technology for a certain amount of research, and presents a model reference adaptive speed reader, and the use of Matlab / Simulink software MARS-based speed sensorless direct torque control system was simulated.Simulation results based on the system, we can see that the speed identifi