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| Suppression of Harmonic Current in Permanent Magnet Synchronous Motors Using Improved Repetitive Controller |
| Wu Yongliao1, 2, Li Hong1, 2, Song Xinda1, 2, Chen Baodong1, 2 |
1. Science and Technology on Inertial Laboratory Beihang University Beijing 100191 China;
2. Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory Beihang University Beijing 100191 China |
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Abstract The repetitive control technique is widely adopted in the field of harmonic suppression, due to its low total harmonic distortion. However in the motor control system, when the ratio of the system sampling frequency to the current harmonic frequency is not an integer, the resonant frequencies of the repetitive control deviate from the practical harmonic frequencies of motor current. As a result, the performance of these systems will be significantly degraded using the conventional repetitive control. In this paper, an improved repetitive controller based on Lagrangian interpolation method was proposed, which adopted a fractional-order delay link based on Lagrange interpolation. The fractional-order delay link can approximate the delay function of the frequency ratio’s fractional part, and then the resonant frequencies of the repetitive control will match the practical harmonic frequencies well. In order to further reduce the tracking error of the current harmonics, the low-pass filter located inside the traditional repetitive control module was removed and the stability of the system was ensured by adding a phase compensator. The validity and effectiveness of the proposed method were demonstrated by simulation and experimental results.
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Received: 23 April 2018
Published: 14 June 2019
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2019, Vol. 34 
