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中文摘要
异步电动机矢量控制系统设计及仿真
摘要
现代交流调速系统在矢量控制技术出现以前多用恒压频比的控制策略，采用这个控制策略的不足之处是在电动机低速转动或者在加减速、加减负载等动态情况下，系统性能显著降低，致使交流调速系统在低速、启动时转矩的动态响应以及整个系统的稳定度方面比直流调速系统逊色，这样就不能满足人们的高精度需求。后来，交流异步电动机控制开始大踏步从标量控制向矢量控制迈进了。下面就来简要介绍下矢量控制理论。
矢量控制发展起来的基础和核心理论支撑是坐标转换原理，机电能量转换理论等一些电机学的概念。这一控制的根本思想方法其实就是将异步电动机模仿成直流电动机来控制。只要建立出与三相交流绕 组等效的两相绕组，即可建立与异步电动机等效的直流电机模型，再加上相应的比例积分调节环节，于是就可按对直流电机的控制策略对异步电动机进行控制。因而使用矢量控制可以实现对电机电磁转矩的动态实时控制，使得调速性能得以优化提高。这次毕设中我根据这个思路成功地进行了MATLAB仿真。
关键词： 交流电动机； 矢量控制调速系统； 仿真
I
ABSTRACT
The Design and Simulation of Vector Control System
of Asynchronous Motor
Abstract
Before the technique of vector control system was invented, alternating current speed control system used constant V/f ratio control method witch is normally known as scalar control. Systems which take this method show vital defect when the motor running at low speed or under circumstances like acceleration, deceleration, adding load, reducing load. Alternating current motor witch use vector control can achieve the same control performance as constant current motor, even better.
Vector control developed from the foundation of the theory of motor integration, mechanical-electric energy transition, coordinates transition. Its main idea is simulating constant current motor to control alternating current motor. Once the equivalent among three-phase alternating current wingding, two-phase alternating current wind and rotating constant current winding is established, the mode of alternating current motor that simulating constant current motor can be created as well. Therefore, asynchronous motor can be controlled in ways according to synchrono