交流感应电机磁链观测模型和无速度传感器应用研究

发布时间：2018-07-09 22:56

本文选题：交流感应电机 + 直接转矩控制改进方法　；参考：《湖南工业大学》2014年硕士论文

【摘要】：继矢量控制技术之后，直接转矩控制作为一种新兴的控制方法省去了复杂频繁的坐标变换，具有结构简单、动态响应快等特点，但其转矩脉动大、低速性能差，为此分析了磁链轨迹为圆形的直接转矩控制改进方法。安装速度传感器所带来的缺陷引发人们考虑用软件方法来代替速度传感器，，因此，无速度传感器技术成为当今的热门研究话题之一。如何准确获取交流感应电机的转速信息成为无速度传感器技术的关键问题，本文对所构造的转速估算方法进行了研究。论文首先对目前的交流调速方法进行概述，阐述了各种磁链观测器和无速度传感器技术，并对各种方案进行简要分析，同时，讨论不同磁链观测器的原理及其优缺点，并比较它们的仿真结果和实验结果，选择全阶磁链观测器作为本研究系统中的磁链估算方法。其次，从建立的交流感应电机数学模型角度出发，采用了直接转矩控制改进方法，并详细分析了该方法的工作原理，在MATLAB环境下对直接转矩控制改进方法进行仿真建模。文中利用PI控制器调节电机的转速信号，为了使系统获得更好的动态性能，提出用单神经元PI控制方法来调节转速信号。通过对两种速度辨识方案的仿真结果比较，验证了全阶磁链观测器的速度辨识具有辨识效果好、动态响应快、稳态精度高等优点。最后，利用TI公司的TMS320F2812构建交流传动实验平台，对研究系统进行软件编程，在不同转速情况下对所设计方法进行实验，实验结果验证了控制方法的正确性和可行性。
[Abstract]:After vector control technology, direct torque control (DTC), as a new control method, eliminates complex and frequent coordinate transformation and has the advantages of simple structure and fast dynamic response, but its torque ripple is large and its low speed performance is poor. An improved method of direct torque control with circular flux locus is analyzed. The defects caused by the installation of speed sensors have led people to consider using software instead of speed sensors. Therefore, speed sensorless technology has become one of the hot research topics. How to accurately obtain the rotational speed information of AC induction motor becomes a key problem in speed sensorless technology. In this paper, the method of speed estimation is studied. Firstly, the paper summarizes the current AC speed regulation methods, describes various flux observer and speed sensorless technology, and briefly analyzes the various schemes. At the same time, discusses the principle of different flux observer and its advantages and disadvantages. The simulation results and experimental results are compared, and the full order flux observer is selected as the flux estimation method in this research system. Secondly, from the point of view of the established mathematical model of AC induction motor, the improved method of direct torque control is adopted, and the working principle of the method is analyzed in detail. The simulation model of the improved method of direct torque control is carried out in MATLAB environment. In this paper, Pi controller is used to adjust the speed signal of motor. In order to obtain better dynamic performance of the system, a single neuron Pi control method is proposed to adjust the speed signal. By comparing the simulation results of two speed identification schemes, it is verified that the speed identification of the full order flux observer has the advantages of good identification effect, fast dynamic response and high steady-state precision. Finally, using TMS320F2812 of TI Company to construct the AC drive experiment platform, the software of the research system is programmed, and the design method is tested under different rotational speed. The experimental results verify the correctness and feasibility of the control method.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM346

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