摘要
传统的滑模观测器采用开关函数,开关函数在切换过程中的高频抖动使得转子位置的估计出现一定的误差.通过对永磁同步电机的数学模型分析,提出用饱和函数代替开关函数,使得观测器处于准滑动模态,有效抑制高频抖动.同时,用扩展卡尔曼滤波器代替传统的低通滤波器,一方面进一步提高估计精度,另一方面省去低通滤波后的相位补偿.通过自适应的方式选取边界层的厚度,使得控制增益和抖动维持在最优状态.最后采用SIMULINK进行仿真,对方案的有效性进行验证.
Switching function is adopted in conventional sliding mode observer （SMO） and a high-frequen- cy jitter takes place in the switching process, so that a definite error occurs to the estimation of rotor posi- tion. By analyzing the mathematical model of permanent magnet synchronous Generat0r（PMSG）, a satu- ration function was proposed to substitute for the switching function. When the saturation function wsas used, the observer would be in quasi-sliding mode and this could restrain the high frequency jitter effec- tively. Meantime, the traditional low-pass filter could be replaced by Extended Kalman filter- this on one hand could further increase the estimation accuracy, and on the other hand, could also save the phase com- pensation after low-pass filtering. In the design of SMO, the boundary layer thickness was selected by u- sing adaptive method, making the control gain and high-frequency jitter keep in an optimal state. Finally, SIMULINK simulation was carried out and the effectiveness of this method was verified with.
出处
《兰州理工大学学报》
CAS
北大核心
2012年第3期75-79,共5页
Journal of Lanzhou University of Technology
关键词
永磁同步电机
滑模观测器
高频抖动
饱和函数
permanent magnet synchronous motor
sliding mode observer
high. frequency jitter
satura-tion function
