【作者】 徐婧玥；

【导师】 万衡；

【作者基本信息】 华东理工大学 ， 控制科学与工程， 2012， 硕士

【摘要】 随着近年来电力电子技术和数字控制技术的发展,各类电机控制技术不断涌现。其中,直接转矩控制以其新颖的控制思想,简单的控制结构和优良的控制性能受到了人们的广泛重视。为了满足多台电机协调控制的要求,本文在传统DTC理论的基础上,推导出了一种基于平均定子磁链定向的直接转矩控制策略,通过控制总的定子电流,实现了同时控制平均定子磁链分量和平均转矩分量的目的。在理论推导的基础上通过PSIM仿真平台验证了该方法的可行性。另外,在交流传动系统中安装速度传感器会使系统成本增加,体积增大,可靠性降低。因此,本文围绕异步电机无速度传感器直接转矩控制系统进行了研究。首先分析了直接转速估算方法和基于模型参考自适应的速度观测方法辨识效果的优劣,在此基础上重点研究了基于交互式MRAS的速度辨识方法,并将此种方法应用在单逆变器驱动双台异步电机的直接转矩控制系统中,通过仿真实验验证了该方法无论在低速还是高速范围内都有着良好的速度辨识效果。在完成了以上理论推导和仿真的基础上,对单逆变器驱动双台异步电机的无速度传感器直接转矩控制系统进行了硬件平台的搭建和软件程序的设计,实验结果证明,基于交互式MRAS的速度辨识技术在单逆变器多机驱动直接转矩控制系统中具有良好的动态性能和稳态性能。更多还原

【Abstract】 With the development of the power electronic and digital control technology, various types of motor control technologies are emerging. Among them, the direct torque control has received widespread attention for its novel control thoughts, simple control structure and excellent control performance. In order to meet the requirements of multi-motors coordination control, a new method based on the average stator flux-oriented control is proposed from the traditional DTC theory. By controlling the total stator current, the method has realized the purpose of the control of the average stator flux-component and average torque-component simultaneously. After the theoretical derivation, the feasibility of this method has been verified on the PSIM simulation platform.In addition, speed sensors installed in the AC drive system will make the system diseconomy, large and low-reliability. This paper focuses on the study of sensorless DTC for AC motors, first analyzes the direct speed estimation method and Model Reference Adaptive Control method. On this basis, a mutual MRAS method is proposed and applied in the single inverter drives double motors DTC system. Simulation results show that this new method has good speed identification performance in both low and high speed ranges.After the completion of the theoretical derivation and simulation, the hardware platform and the software are designed. The experimental results verify that the mutual MRAS method applied in the single inverter drives double motors DTC system has both good dynamic and steady performance.更多还原