【作者】 周俊勇；

【导师】 金阳；

【作者基本信息】 浙江工业大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 本文简述了变频调速控制技术的发展和研究现状。从建立异步电机的数学模型开始，导出了矢量控制理论并分析了其不足之处。分析比较了当前主要的三种异步电机速度辨识方法。提出了一种简单而有效的电机速度辨识方案，仿真结果揭示了它的优越性。通过对定子磁链矢量控制系统的分析，可知该系统避免了矢量控制系统对转子参数的依赖，具备了直接转矩控制的实质。采用了固定步长，在开关频率不高时仍能取得较好的控制效果。但是对转子磁链估计的精度要求很高。文中应用Matlab／Simulink构造了该系统并和经典矢量控制系统作了仿真比较。验证了上述观点。更多还原

【Abstract】 The development and the state of control technique of variable frequency speed regulation are described in this paper first.Based on the mathematic model of Induction Motor,the principle of field oriented coatrol is deduced and the drawback of FOC then discussed. Three papular approaches to IM speed identification are compared in simulation. A simple and efficient way to estimate rotor speed is proposed, Simulation results show the feasibility of the proposed strategy. This paper analyzed the Stater Flux Vector Control(SFVC) method of induction motors. Possessed the essential of DTC,SFVC is independent of rotor parameters. That is different from the FOC system. SFVC is a simple control system that works at fixed frequency and achieves good effect under low switch frequency. But it needs a high accuracy of estimation of rotor flux. The simulation results of SFVC is compared to the FOC’s and verified the conclusion just mentioned.更多还原