基于电流辨识速度的双馈矢量调速系统的研究

Study on Doubly-Fed Vector Speed-Regulating System with Speed Identification Based on Current

基于磁链进行速度辨识的无速度传感器的双馈调速系统 ,在同步速附近不能准确计算磁链 ,所以系统在同步速附近存在死区。本文提出了一种基于电流进行速度辨识的双馈矢量调速系统 ,有效解决了这一问题。文中给出了速度辨识原理及调速系统的组成 ,进行了系统仿真和实验。

As known,the doubly fed motor vector speed control system with speed and position sensors has good performance.But the usage of the sensors increases cost and decreases the reliability of the system.Generally speaking,flux linkage in sensorless speed control system is used for identifying speed.Because the flux can not be calculated correctly when motor speed is close to synchronious speed,there is a dead zone in the speed sensorless doubly fed system.In this paper a new method of speed identification based on current is proposed.By using the current identification method,the rotor speed and position can be identified accurately in the whole speed regulating region.Thus,the system can work smothly at sub synchronous and super synchronous speeds.The speed identification principle and the system constitutes are given in the paper.The simulation and test results indicate that system performance is very good.