摘要
为了提高异步电机定子磁链观测精度,减小观测误差受其运行过程中温度、频率和磁路等因素的影响,使用定子磁链全阶观测器观测定子磁链。利用静止坐标系下的异步电机数学模型,分析当电机参数改变时,高速运行状态下定子磁链观测器u-i模型和低速运行状态下i-n模型的观测误差变化情况,然后给出定子磁链全阶观测器增益矩阵的确定方法。在Matlab/Simulink仿真环境下,进行了仿真验证。研究结果表明:定子磁链观测精度主要是随着电机在运行过程中转速和转矩的变化而变化;采用此方法在保证观测器稳定的前提下,依据不同的转速区间,选择合适的观测器极点配置,可以提高异步电机全速运行状态下定子磁链的观测精度;采用此方法有效地提高了全速范围内定子磁链的观测精度,并且实现简单。
In order to improve observation accuracy of the stator flux and minimize observation error which is influenced by temperature, frequency and magnetic path in motor operation process, a full order observer was presented. The change of observation error was analyzed in the case of stator flux observer u-i model at high speed and i-n model at low speed when the parameters of motor changed based on the mathematical model in the stationary coordinates. A method to determine the gain matrix of full order observer was presented. The results show that the error changes with the change of motor speed and torque. On the premise of assuring stability of the observer, according to different speed ranges, choosing the proper way to set the pole of observer, the method can be used to improve the observation accuracy of stator flux at high speed, and it is also validated in the Matlab/Simulink condition. It is shown that it can improve observer accuracy of the induction motor stator flux effectively.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第4期793-798,共6页
Journal of Central South University:Science and Technology
基金
国家“863”计划资助项目(2006AA042181)
关键词
异步电机
定子磁链
全阶观测器
induction motor
stator flux
full order observer
