双级矩阵变换器的异步电动机预测直接转矩控制研究

发布时间：2018-01-16 14:23

本文关键词：双级矩阵变换器的异步电动机预测直接转矩控制研究　出处：《辽宁工程技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了改善电网电能质量、实现节能减排,研究异步电机高性能的交流调速技术是非常有要意义的。本文针对传统直接转矩控制所存在的缺点而引入模型预测控制对其进行改进,并将双级矩阵变换器与改进的预测直接转矩控制组合在一起应用到异步电动机交流调速系统中,这种组合系统可以同时具备双级矩阵变换器网侧单位输入功率因数、良好的网侧及负载侧波形、输出电压频率可调和直接转矩控制系统的结构框架简单、快速的动态响应、良好的稳定性等优点。本文对双级矩阵变换器和预测直接转矩控制组合而成的异步电动机交流调速系统进行了理论分析和仿真验证研究。本文对双级矩阵变换器的电路结构、控制方法和传统直接转矩控制系统的工作原理进行了分析。以传统直接转矩控制方法为理论分析依据,将模型预测控制引入到直接转矩控制中对电磁转矩和定子磁链进行预测控制,分析了基于模型预测控制的直接转矩控制的工作过程。将双级矩阵变换器和基于模型预测控制的直接转矩控制组合在一起应用到异步电机交流调速系统中,并对结合后的系统进行仿真验证。在仿真分析中,在异步电机空载的情况下,调节双级矩阵变换器的输出频率和输出电压,观察得到的输入输出电压和电流波形；对比传统直接转矩控制系统和基于模型预测控制的直接转矩控制系统仿真结果并且观察定子电流波形、电磁转矩波形和磁链波形。仿真结果验证了系统可以实现输入单位功率因数、具有良好输入输出波形的优点,而且比传统直接转矩控制动态响应速度快、转矩纹波小的优点。
[Abstract]:In order to improve power quality, realize energy saving and emission reduction, the technology of AC speed regulation of asynchronous motor with high performance is of great significance. This paper aiming at the disadvantages of the traditional direct torque control and model predictive control is introduced to improve it, and the direct torque prediction of two stage matrix converter with improved control together. The application of AC induction motor drive system, this system can be combined with two stage matrix converter side unit input power factor, the network side and load side good waveform, frame frequency of output voltage adjustable direct torque control system simple, fast dynamic response, good stability and other advantages. This paper study on theoretical analysis and simulation prediction of asynchronous motor direct torque control of AC speed control system composed of two stage matrix converter and the. The circuit structure of two stage matrix converter, working principle and control method of traditional direct torque control system are analyzed. Based on the traditional direct torque control method based on theoretical analysis, model predictive control method is introduced to predict the control of electromagnetic torque and stator flux direct torque control, analyzes the working process model predictive direct torque control the control based on the two-stage matrix converter and direct torque control based on model predictive control combined with the application of AC induction motor drive system, and the simulation of system combination. In simulation, the no-load asynchronous motor under the condition that the regulation of two stage matrix converter output frequency and the output voltage, observed input voltage and output current waveform; compared with the traditional direct torque control system and direct conversion model based on predictive control Torque control system simulation results and observe the waveform of stator current, electromagnetic torque and flux waveform waveform. The simulation results verify the system can realize the unit input power factor, has the advantages of good input and output waveform, and compared with the traditional direct torque control dynamic response speed, torque ripple of small advantages.

【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM343;TP273

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