Open AccessSuppression of harmonic current in permanent magnet synchronous motors using improved repetitive controller
Author(s) -
Wu Yongliao,
Song Xinda,
Li Hong,
Chen Baodong
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2018.7035
Subject(s) - control theory (sociology) , harmonics , harmonic , controller (irrigation) , repetitive control , interpolation (computer graphics) , fundamental frequency , harmonic analysis , lagrange polynomial , current (fluid) , computer science , mathematics , engineering , physics , electronic engineering , control system , acoustics , voltage , electrical engineering , mathematical analysis , telecommunications , agronomy , control (management) , frame (networking) , artificial intelligence , polynomial , biology
This Letter proposes an improved repetitive controller based on Lagrangian interpolation method to suppress harmonic current in the permanent magnet synchronous motor. Harmonic current suppression performance is degraded drastically if the ratio of the sampling rate to the fundamental frequency of harmonic current is fractional. The fractional‐order delay link based on Lagrange interpolation is used to approximate the delay link which is composed of the fractional part of the frequency ratio. In order to further reduce the tracking error of the current harmonics, the low‐pass filter located inside the traditional repetitive controller is removed and the stability of the system is ensured by adding a phase compensator. Finally, the experimental results demonstrate the effectiveness of the proposed scheme.