无模型控制方法在异步电动机控制中的仿真研究

在异步电动机的转差频率矢量控制中,其控制不需要复杂的磁通检测,且运算和控制简单,因而在基频以下的调速系统中得到较多的应用。但该系统存在比较明显的缺陷。基于此,本文设计了一种无模型自适应控制器,将该控制器引入原系统,与原系统构成前馈补偿。仿真试验表明,该方法有效减小了转矩脉动,改善了定子电流波形,具有良好的动、静态性能。

Simulation Study on Model-free Control Method in Asynchronous Motor Control System

The slip frequency vector control of the asynchronous motor does not need the complicated flux detection, thus it is widely used in the speed control system which works under baseband. However, the shortcomings of the system are the large steady-state error, the long rising time and so on. Based on these issues, The paper presents a model-free adaptive controller which is introduced into the original system and constitutes the forward compensation with original system. Simulation results show that the controller for the induction motor slip frequency vector control system reduces the system steady-state error and the system＇s dynamic characteristics have been greatly improved.