Title :
Improved performance of sensorless induction motor drive based on variable link voltage
Author :
Kim, Sang Kyoon ; Kim, Young Sam ; Kwon, Young Ahn
Author_Institution :
Dept. of Electr. Eng., Pusan Nat. Univ., South Korea
Abstract :
Most sensorless algorithms are based on the mathematical modeling of motors, and all the information is obtained from the monitored voltages and currents. Therefore, the accuracy of such variables largely affects the performance of a sensorless induction motor drive. However, the output voltage of the SVPWM-VSI which is widely used in a sensorless induction motor drive has a considerable error, especially in a low speed range. This paper proposes a variation of the dc link voltage as a high-performance strategy for overcoming the above problem. The proposed strategy leads to an improved resolution of the output voltage of the SVPWM-VSI in a sensorless induction motor drive. Simulation and experiment have been performed for the verification of the proposed strategy.
Keywords :
PWM invertors; induction motor drives; observers; variable speed drives; voltage control; VSI; dc link voltage; mathematical modeling; sensorless algorithm; sensorless induction motor drive; space vector pulse width modulation; variable link voltage; voltage source inverter;
Conference_Titel :
SICE 2003 Annual Conference
Conference_Location :
Fukui, Japan
Print_ISBN :
0-7803-8352-4