【作者】 孙筠；

【导师】 林忠岳；

【作者基本信息】 广西大学 ， 控制理论与控制工程， 2005， 硕士

【摘要】 转子磁场定向控制使交流调速系统的性能产生了质的飞跃,异步电机无速度传感器矢量控制更是增加了系统的简易性和鲁棒性,因而成为目前交流传动发展的主要方向之一。这种控制方法最关键的问题是如何进行速度推算和转子磁链估计。本文应用基于超稳定性理论的模型参考自适应系统,对无速度传感器矢量控制系统的转速估计和转子磁链观测进行了研究。 本文首先介绍了交流传动的发展动向,接着阐述矢量控制基本原理、坐标变换和异步电机在不同坐标系下的数学模型。在此基础上,本文提出了一种PI控制器与模型参考自适应(MRAS)结合的无速度传感器矢量控制算法,通过建立参考模型和可调模型,由自适应机构调节可调模型参数,使两个模型的输出误差趋于零,在有干扰或系统出现动态变化时,保证系统仍然具有良好的性能。对控制系统建立数学模型,用MATLAB进行动态仿真,并对结果进行理论分析,通过仿真实验说明方案的有效性和正确性。 实验部分基于电机控制专用DSP(TMS320F240)开发系统,利用软件实现对磁链和转速的估计,以及空间矢量调制算法等,获得了令人满意的实验结果,由此构成的无速度传感器系统具有良好的静、动态性能。更多还原

【Abstract】 The rotor field oriented control has brought essential advances in AC variable speed drive system. Speed sensorless induction motor drive promotes the simplicity and robustness further, so the sensorless field-oriented control (FOC) technology is one major direction of motion control. In the technology the key problem is how to estimate the speed and the flux of the rotor. Based on the former researches, the speed estimation and rotor flux observation methods are studied using the theory of Model Reference Adaptive System (MRAS).In this paper the tendency of motion control is introduced first. Next the basic field-oriented control principle and coordinate transformations are presented. The mathematic models in the different reference frame are also proposed. Then the paper discusses the implementation of a new kind of rotor flux and speed observer based on a model reference adaptive system, and a speed sensorless field-oriented control system using PI controller for induction motor is presented. By the referenced model and the adjusted model are established, the output error of that two models is close to zero through the adaptive institution adjusts parameters of the adjusted model. And ensure the system also has better performance, if there is existing interference or the dynamic change is taking place in the system. Besides the model of the control system is established, also the simulation results show the MRAS-based field oriented control system is accurate and effective.Experiment is based on the DSP (TMS320F240) design system for digitalmotor control. Software programs carry out algorithm to estimate the rotor speed and fluxes, and space vector pulse width modulation algorithm. The satisfied experimental results prove that the speed sensorless drive system based on which has good static and dynamic performance.更多还原