Open AccessQuasi‐discrete modelling of PMSM phase currents in drives with low switching‐to‐fundamental frequency ratio
Author(s) -
Jarzebowicz Leszek
Publication year - 2019
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2018.6285
Subject(s) - phase (matter) , control theory (sociology) , three phase , low frequency , physics , chemistry , computer science , electrical engineering , engineering , voltage , quantum mechanics , telecommunications , control (management) , artificial intelligence
This study proposes a new quasi‐discrete approach to modelling the permanent magnet synchronous motor (PMSM). The quasi‐discrete modelling reflects the impact of continuous rotor movement, which takes place during a control cycle, on the shape of motor current waveforms. This provides much improvement in current modelling accuracy under inverter low switching‐to‐fundamental frequency operation. The proposed approach may be used in predictive control to compute current at forthcoming instants or in classical control to improve precision of determining mean current feedback. The superior accuracy of the quasi‐discrete model is confirmed by simulation and experiment for an exemplary PMSM drive operating at inverter switching frequency of 5 kHz and fundamental frequency reaching 400 Hz.