Instability phenomena and remedies in sensorless indirect field oriented control

被引:55
作者
Harnefors, L [1 ]
机构
[1] Royal Inst Technol, Dept Elect, Div Elect Machines & Power Elect, SE-10044 Stockholm, Sweden
[2] Malardalen Univ, Dept Elect Engn, SE-72123 Vasteras, Sweden
关键词
field orientation; flux estimation; induction motor; instability; sensorless control; speed estimation;
D O I
10.1109/63.849044
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Sensorless indirect held oriented induction motor drives using information in the fundamental excitation for speed estimation are considered, It is shown that instability phenomena which are not present for sensored operation occur, both for nominal and low speeds. The problems at nominal speeds are remedied by adding a term to the standard slip relation, such that approximate "voltage model" characteristics are obtained, The low-speed problems are remedied by careful choice of the model machine parameters and the torque-producing stator current component. It is also shown how a speed estimation algorithm based on a voltage error can be designed. Its asymptotic properties are similar to those of a current error-based least squares estimator such as the extended Kalman filter. As no state observer is required, the sensorless control system is computationally very efficient, requiring only about 15 multiplications and two divisions per sample for a digital implementation.
引用
收藏
页码:733 / 743
页数:11
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