【作者】 吴臻鹏；

【导师】 陈硕；

【作者基本信息】 福州大学 ， 机械制造及其自动化， 2003， 硕士

【摘要】 本文根据磁通观测器理论和自适应控制理论，提出了一种无速度传感器矢量控制调速新方法。根据异步电机矢量控制理论，本系统利用电压模型的磁通应与电流模型的磁通相一致，实现转速推算和转速控制。利用磁通观测器，可避免用电压模型推算转子磁通时遇到的积分运算问题（初始值确定和误差积累引起的积分漂移）。本系统的优点之一是磁通的指令值通过计算电流模型而获得，所有的磁通量（电压、电流模型）都是直流量，便于控制和检查，系统的稳定性易于分析，另一个优点是利用磁通观测器可以避免用电压模型推算磁通时的积分运算问题。为了提高本系统的动态特性，本文采用了具有较好动态性能和鲁棒性的变参数PI算法，构造了一种改进的速度估算方法。本论文还推导出控制系统的线性化模型用来对系统进行稳定性分析和控制器参数的选择。本文还提出了利用DSP（TMS320F240）为主控制器实现无速度传感器矢量控制的总体设计和部分程序设计，介绍了本实验系统的部分外围电路的设计。此外，本文还介绍了利用MATLAB/SIMULINK实现无速度传感器矢量控制系统计算机动态仿真程序设计。最后，论文中给出了控制系统稳定性分析的结果以及计算机的动态仿真结果，证明了本控制系统的可行性。与此同时，论文中还给出了采用变参数PI控制和定PI控制的动态仿真结果对比，说明本文提出的改进的无速度传感器矢量控制系统速度估算方法的有效性。更多还原

【Abstract】 This paper proposes a new method for sensorless vector control of induction motors, which is based on the flux observer theory and the adaptive control theory. According to the vector control theory of an induction motor, we utilize the speed estimation and speed control by the rule that the rotor flux of the voltage model must be coincident with the one of the current models. In order to solve the problems of flux estimation using the voltage model, such as the initial value and the drift of pure integrator, a flux-observer-based method is applied. The advantages of this system are that the fluxes from the current model are easily obtained, all of the fluxes (from voltage and current models) are dc quantities, which are convenient for control and checking, and the system stability is easily analyzed. A further advantage is the avoidance of integration problems. In order to improve the dynamic performance of this system, this paper proposes an improved speed estimator, which is based on a variable argument PI mechanism. The linear model of the proposed system is derived to analyze the system stability and to select the controller gains.Additionally, this paper proposes an experimental system using DSP (TMS320F240) as a main controller to realize the system mainframe design and some of the functional programs. Meanwhile, this paper also includes some of the peripheral circuit design. Furthermore, this paper introduces the dynamic simulation design of speed sensorless vector control system using MATLAB/SIMULINK.Finally, the paper presents the stability analysis results and dynamic simulation results of the proposed system to prove the system validity. Meantime, we also offer the variable argument PI control simulation results contrast to the ordinary PI control’s results to verify its effectiveness.更多还原