access icon free Power factor improvement of permanent-magnet linear vernier motor by using dual-inverter with hybrid discontinuous PWM

© The Institution of Engineering and Technology
Received 20/02/2019, Accepted 16/05/2019, Revised 02/05/2019, Published 17/05/2019

A permanent-magnet linear vernier (PMLV) motor has the advantages of large force and low cost, but it suffers from a low-power factor. This study proposes an instantaneous power control algorithm by using a dual-inverter open-winding (OW) configuration to equivalently improve the PMLV motor power factor. In the proposed algorithm, the active and reactive powers for the motor operation are supplied by the main and compensation inverters, respectively. Therefore, the main inverter dc-link voltage is fully utilised to generate the active power, which is equivalent to the improvement of the motor power factor. Furthermore, a hybrid discontinuous pulse width modulation (HDPWM) scheme is proposed, which takes into consideration the power factor characteristics of the dual-inverter. Compared to the existing OW modulation ones, the proposed HDPWM technique can greatly reduce the dual-inverter loss. The experimental results are carried out to verify the proposed control strategy.

Inspec keywords: pulse width modulation; power control; invertors; linear machines; PWM invertors; power factor; permanent magnet motors; permanent magnet machines; machine control

Other keywords: OW modulation; reactive powers; power factor improvement; hybrid discontinuous pulse; active powers; motor operation; dual-inverter loss; instantaneous power control algorithm; PMLV motor power factor; permanent-magnet linear vernier motor; compensation inverters; power factor characteristics; OW configuration; hybrid discontinuous PWM

Subjects: DC-AC power convertors (invertors); Power and energy control; Control of electric power systems; Linear machines

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