【作者】 崔风波；

【导师】 胡庆；

【作者基本信息】 沈阳工业大学 ， 电机与电器， 2007， 硕士

【摘要】 直接转矩控制技术，是继矢量控制技术之后出现的又一种新的控制思想，其控制手段直接，系统响应迅速，具有优良的静、动态特性，系统鲁棒性好，因而受到了普遍关注并得到了迅速发展。本论文从交流调速技术的发展开始，分析了异步电机直接转矩控制的基本原理，推导了u-i、i-n两种磁链模型，并对这两种磁链模型的适应范围和特点进行了分析，然后推导了在全速范围都适用的u-n模型。u-n模型的特点是：低速下工作于i-n模型，高速下工作于u-i模型，高低速之间自然过渡，加之引入电流调节器对电流观测值进行补偿，大大提高了模型的观测精度。然后以交流电力机车为例，介绍了直接转矩控制技术在交流调速系统中的应用，并根据电力机车的牵引特性，设计了不同的控制策略：(1)低速区：采用圆形磁链的直接转矩控制；(2)高速区：采用六边形磁链的直接转矩控制；(3)弱磁区：通过改变磁链给定值来调节转矩，实现恒功率调节。同时应用MATLAB／SIMULINK软件建立了直接转矩控制系统的仿真模型，并得出了仿真结果，验证了该方法的正确性。最后介绍了无速度传感器的直接转矩控制方法，推导了基于模型参考自适应(MRAS)理论的转子转速的辨识方法，建立了转子转速的辨识模型，并得到了仿真结果。更多还原

【Abstract】 Direct Torque Control (DTC) technology is another new control thought after vector-control technology. It has direct control methods, rapid response system, excellent static and dynamic characteristics and the system’s robustness is good, so DTC has been widely studied and has achieved rapid development.This paper presents the development of AC speed regulation technology and then analyzes the basic principle of induction motor direct torque control. It deduces u-i and i-n two kinds of flux linkage models, and the proper area and features of these two models are analyzed, then a u-n model which is suitable in the range of all speed .The u-n model features: using i-n model in the low speed and u-i model in the high speed range. The transition between low speed and high speed can be smooth, as the current regulator can compensate the observed current, the precision of the observation is raised greatly.Then take exchange electric locomotive as the example, this paper introduced the application of direct torque control technology in the exchange velocity modulation system. Based on traction characteristics of electric locomotive, it has designed the different torque control strategies:(1) Direct torque control with circular stator flux in the low-speed range.(2) Direct torque control with hexagon stator flux in the high-speed range.(3) The torque is adjusted by setting different references of the stator flux in weaken flux area. The system power is invariable.Simultaneously with the application MATLAB/SIMULINK software, it has established the direct torque control system simulation model, has obtained the simulation result and has confirmed the accuracy of this method.Finally, non-velocity generator direct torque control method is presented. The thesis deduces the identification method of rotor speed based on model reference adaptive system (MRAS). The simulation model is set up and the results are also given.更多还原