access icon free Quasi-discrete modelling of PMSM phase currents in drives with low switching-to-fundamental frequency ratio

© The Institution of Engineering and Technology
Received 27/11/2018, Accepted 08/08/2019, Revised 06/05/2019, Published 09/08/2019

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.

Inspec keywords: machine vector control; permanent magnet motors; invertors; predictive control; rotors; synchronous motor drives

Other keywords: inverter low switching-to-fundamental frequency operation; inverter switching frequency; quasidiscrete approach; motor current waveforms; mean current feedback; frequency 400.0 Hz; PMSM phase currents; PMSM drive; permanent magnet synchronous motor; switching-to-fundamental frequency ratio; quasidiscrete model; frequency 5.0 kHz; quasidiscrete modelling

Subjects: Drives; DC-AC power convertors (invertors); Synchronous machines; Control of electric power systems; Optimal control

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