毕业设计-感应电动机磁场定向矢量控制系统的设计与仿真.doc

本科毕业设计（论文） 感应电动机磁场定向矢量控制系统的设计与仿真 燕 山 大 学 2012 年 6月 摘 要 由于直流调速的局限性和交流调速的优越性，以及计算机技术和电力电子器件的不断发展，异步电动机变频调速技术正在快速发展之中。经过最近十几年的应用开发，交流异步电动机的变频调速性能已经可以与直流调速系统相媲美。目前广泛研究应用的异步电动机变频调速技术有恒压频比控制方式、矢量控制、直接转矩控制等。本文采用异步电动机的矢量控制调速技术，具有动态响应快、低速性能好和调速范围宽等优点。 矢量控制思想是将交流电动机模型等效成直流电动机模型加以控制，利用坐标变换理论，将非线性、强耦合的交流电机模型解耦，把交流电动机定子电流矢量分解为两个分量：励磁电流分量，转矩电流分量。通过对这两个矢量分别控制，从而实现对磁场和转矩的分别控制。 本文设计了一个带转矩内环的转速、磁链闭环矢量控制系统。系统的动态响应能力快和抗干扰能力强，转矩内环有助于提高转速和磁链闭环控制系统的解耦性能。 运用MATLAB的工具软件SIMULINK对矢量控制系统进行仿真研究，仿真结果表明了本设计的合理性。 关键词 异步电机；矢量控制；磁场定向 Abstract As a result of the limitation of direct-current speed control modulation and the superiority of alternating speed control modulation and the unceasing development of computer technology and electric power device, the frequency conversion velocity modulation technology of asynchronous motor is in the rapid development. After the application and development in the past 10 years, the frequency conversion velocity modulation performance of asynchronous motor can be comparable with the direct current velocity modulation system.At present, the asynchronous motor frequency control, vector control and direct torque check etc. are in detailed studies. This paper uses the modulation method of asynchronous motor, which has the dynamic response quickly and low-speed performance and wide velocity modulation scope. Vector control is developed based on the idea that the controlling means of induction motor can be equivalent to the DC motor，The induction motor mathematic model that is high nonlinear and complex coupling can be separated by coordinate transformation theory，Stator current can be decomposed into excitation current component and the torque current component, then the magnetic field and torque can be separately controlled by controlling the two current components． This paper designed flux regulator, torque regulator and speed regulator, constituting the inner ring with torque of speed, closed-loop flux vector control system.To improve the system d