Full-Order Rotor Flux Observer for Speed Sensorless Vector-Controlled Induction Motor Drives

• Main Authors: Yu-Cheng Wang, 王佑丞
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/595d38

碩士 === 國立臺灣科技大學 === 電機工程系 === 95 === The objective of this thesis is to conduct research on the analysis and implementation of sensorless rotor-flux-oriented direct vector control laws, in which measured motor stator currents and voltages are used to computer rotor flux without using high frequency injection. The thesis designs a full-order rotor flux observer which is further compared to conventional open-loop flux observers, which include current-model and voltage-model flux observers. All observers are compared and verified using both simulation and experiments. Both simulation and experimental results show that the full-order flux observer, though more complicated in computation, outperforms open-loop flux observers. The thesis then applies the full-order flux observer with an adaptive speed estimator to realize speed-sensorless direct vector control. In particular, a current regulation term can successfully stabilize the regenerative braking of the drive during low speed operation. The controllable speed range is from 40 to 2000 rpm. The experiments of this thesis are based on a PC-based digital control board. All the simulation and experimental programs are developed under MATLAB, Simulink, and Real-Time Workshop.