Carrier-Based PWM with Enhanced DC-Link Exploitation for Five-Phase Machines with Circulating-Current Filters Conference Paper uri icon

abstract

  • © 2018 IEEE. Multiphase machines are attracting significant attention due to their advantages over three-phase ones. When using pulsewidth modulation (PWM), a zero-sequence signal can be injected so that the dc-link utilization is improved. For instance, in five-phase machines, for a certain dc-link voltage the fundamental component is increased in this way in 5.1%. Instead of PWM, it is possible to apply a square voltage waveform, which permits even better dc-link exploitation (27.3% with respect to conventional without zero sequence). Given the substantial voltage distortion, filters with large impedance at the low-impedance no-torque subspaces were devised. In any case, some of the square-waveform harmonics are mapped into the torque-producing plane without being attenuated by the filters, thus generating torque ripple. This paper proposes a carrier-based PWM method for five-phase drives that include a filter for circulating currents. This PWM technique takes advantage of the no-torque-producing components, which see a high filter impedance, to exploit the dc link to a degree similar to square voltage waveforms (23.1% versus 27.3%), but without the extra torque ripple. Simulation results are provided.

author list (cited authors)

  • Yepes, A. G., Doval-Gandoy, J., & Toliyat, H.

citation count

  • 1

publication date

  • October 2018

publisher