Adaptive Compensation Flux Observer of Permanent Magnet Synchronous Motors At Low Carrier Ratio

When the permanent magnet synchronous motor (PMSM) works in the high-speed region with low carrier ratios, the performance of the rotor flux observer has a great influence on the loading capacity and stability of the speed sensorless vector control system. The problem of the adaptive compensation fl...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2021-12, Vol.36 (4), p.2747-2760
Main Authors: Sun, Xiangdong, Wu, Chao, Wang, Jianyuan
Format: Article
Language:English
Subjects:
Adaptive control
Compensation
Control stability
Directional control
flux observer
Harmonic analysis
low carrier ratio
Observers
Performance enhancement
Permanent magnet motors
Permanent magnet synchronous motor (PMSM)
Permanent magnets
Pulse width modulation
Ratios
Rotors
Stators
Synchronous motors
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Summary:When the permanent magnet synchronous motor (PMSM) works in the high-speed region with low carrier ratios, the performance of the rotor flux observer has a great influence on the loading capacity and stability of the speed sensorless vector control system. The problem of the adaptive compensation flux observer (ACFO) of the PMSM at low carrier ratios is analyzed in this paper, and an ACFO with a feedback delay component is presented. After retuning the PI regulator parameters, the new expression related to carrier ratio is obtained, which can improve the performance of the flux observer at low carrier ratios and make the torque and current loop response faster. Meanwhile, the stability of different Euler approaches of the integrator for ACFO in the discrete domain is analyzed, and a new Euler with a coefficient is proposed to combine the merits of the backward Euler and the trapezoid Euler. It shows better performance at low carrier ratios. Finally, the effectiveness of the discrete ACFO is verified by experiments.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2021.3084372