access icon free VSP predictive torque control of PMSM

© The Institution of Engineering and Technology
Received 03/08/2018, Accepted 28/01/2019, Revised 04/12/2018, Published 30/01/2019

This study applies the idea of variable switching point (VSP) to the predictive torque control (PTC) strategy for permanent magnet synchronous motor (PMSM) and proposes a new method to suppress the torque ripple of PMSM, without causing higher switching frequency. In this study, the head vector and tail vector act together in one control period. They form an infinite synthesised vector set based on VSP control. According to the distribution of all synthesised vectors and the position of expected voltage vector, the candidate VVs table containing duty ratio information is constructed off-line. By using the position information of expected voltage vector and the tail vector of the previous period, 3–5 candidate VVs in the table can be directly obtained, so the VSP predictive control can be realised without calculating the switching time online. The experimental results show that the proposed VSP-PTC can effectively suppress the torque ripple without causing high switching frequency.

Inspec keywords: synchronous motors; torque control; predictive control; permanent magnet motors; vectors; machine control; switching convertors

Other keywords: PMSM; infinite synthesised vector; synthesised vectors; VSP-PTC; position information; high switching frequency; VSP predictive torque control; torque ripple; expected voltage vector; VSP predictive control; variable switching point; higher switching frequency; previous period; tail vector; control period; DB-VV; VSP control; head vector; candidate VVs table containing duty ratio information; 3–5 candidate VVs; switching time online; predictive torque control strategy; permanent magnet synchronous motor

Subjects: Optimal control; Control of electric power systems; Synchronous machines; Mechanical variables control

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