Vector control system for AC drive
Improvement of vector control system (FOC) of AC drive
Overview
This study is devoted to development of theoretical and practical study of new solutions aimed to improving the efficiency of electric drives using vector control of asynchronous electric drive with using power LC-filter at the output of the frequency converter and injection signal for identification active resistance of the rotor circuit. In the vector control system did not use speed sensor.
Highlights
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New rotor flux observers were synthesized, which are efficient in the rotor speed range from zero to rated, and accurately reproduce injected component in the estimation of flux vector magnitude, which provides a more accurate observation of the rotor circuit resistance.
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New blocks for synchronous speed evaluation were developed with high accuracy observation, and functioning of the rotor speed range from 0 to rated in the presence of the injected signal.
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Adaptive observer for speed and the rotor time constant estimating was designed, with algorithmic simplicity and performance which is not depending on rotor speed.
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New evaluation blocks for main harmonic components real time estimation in single- and two-phase signals with the "noisy" signals with different constant components in each phase, without information about the frequency of the signal were designed.
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Algorithmically simple predictive compensator LC-passive output filter for real time correcting the program signal PWM was synthesized.
Achievements
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The improved vector control system of electric drive with using injection signal to identification the rotor time constant was studied.
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The study was conducted both by simulation and by staging laboratory and industrial experiments.
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Studies have confirmed the high dynamic performance of the developed vector control system.
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Based on the results of this study, 1 dissertation, 3 scientific articles and 1 in patent were published.
