转子电阻对DTC控制系统低速性能影响分析及修正方案  

Modifying and Analysis on Influences of Rotor Resistance Change in Low-speed Range of DTC System

作　　者：张超[1] 年晓红[1] 王涛[1] 

机构地区：[1]中南大学信息科学与工程学院,长沙410004

出　　处：《系统仿真学报》2009年第11期3346-3350,3355,共6页Journal of System Simulation

基　　金：国家自然科学基金(60474029;60774045;60634020);中国博士后科学基金(2005038558);湖南省科技厅博士后专项基金(2006FJ4234);湖南省教育厅科研项目(06C042)

摘　　要：在设计的一种基于自适应磁链观测器的无速度传感器感应电机直接转矩控制系统基础上,运用Lyapunov稳定性理论,构造新型Lyapunov函数,推导出转子速度和转子电阻的自适应辨识率,从理论上严格证明了磁链观测器的稳定性。同时利用LMI工具箱,求解双线性矩阵不等式,得到自适应观测器的增益矩阵,使得磁链观测器的稳定性在包括零点在内的足够大的对称区间里得到保证,从而保证了系统在全速范围内稳定运行。通过仿真和试验,对转子电阻变化对直接转矩控制系统低速性能的影响进行了仿真研究。研究结果表明:转子电阻变化对直接转矩控制低速性能有较明显的影响,同时,给出的转子电阻辨识方案对直接转矩控制低速时的速度辨识有很好的修正作用。An adaptive flux observer was designed for a speed sensorless direct torque controlled induction motor drives. By using Lyapunov theorem, new Lyapunov function was set, rotor speed and rotor resistance adaptive law were given. The constant observer gain was obtained by solving two bilinear matrix inequalities. The stability of the flux observer was ensured in a sufficiently large symmetric interval include zero point. Therefore, the sensorless drive system is capable of steadily working in low speed range and exhibits good dynamic and steady-state performance. The impact of the rotor resistance change on the low-speed performance of speedless direct torque control system was at first verified by simulation and then by extensive experimentation. The result shows that the rotor resistance change has great influence on the performance of speed sensorless direct torque control system, and the proposed rotor resistance estimator is capable of modifying the estimated speed effectively.

关 键 词：无速度传感器 全阶自适应观测器 直接转矩控制 速度辨识 转子电阻辨识 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]