access icon free An improved finite-state predictive torque control for switched reluctance motor drive

© The Institution of Engineering and Technology
Received 06/05/2017, Accepted 13/09/2017, Revised 11/09/2017, Published 20/09/2017

This study proposes an improved finite-state predictive torque control (FS-PTC) to minimise the torque ripples of switched reluctance motor (SRM) drive. Firstly, based on the accurate analytical method, a discrete time model is established for predicting the future states of SRM drive system. Secondly, to reduce the computational burden, a new switching table is constructed for the predictive controller by using the sector partition technique. Further, the torque ripple, copper losses, and average switching frequency are considered synchronously by using a multi-objective cost function. As a result, the proposed FS-PTC method not only can minimise the torque ripple but also can reduce effectively the copper losses and average switching frequency. Finally, the experimental results are carried out for a three phase 12/8 poles 1.5 kW SRM with the proposed control algorithm and the results are compared with conventional direct instantaneous torque control algorithm. These results demonstrate the effectiveness of the proposed method.

Inspec keywords: discrete time systems; torque control; predictive control; reluctance motor drives; machine control

Other keywords: switched reluctance motor drive; conventional direct instantaneous torque control algorithm; torque ripple minimisation; sector partition technique; improved finite-state predictive torque control; switching table; discrete time model; FS-PTC method; analytical method; multiobjective cost function; copper losses; average switching frequency; three phase 12/8 poles SRM

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

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