Paper Info
Title
Improvement in DC-Link Utilization With Reduced Current and Torque Deterioration for Five-Phase Drives by Combination of Circulating-Current Filters and Simple Carrier-Based PWM Based on Closed-Form Expressions
Abstract
Multiphase drives offer important advantages over three-phase ones. With pulsewidth modulation (PWM), zero-sequence and x-y signals can be injected to enhance dc-link utilization (DLU). For example, in five-phase drives, for given dc-link voltage, the fundamental is raised by 23.1%. For sinusoidally distributed windings, although x-y currents increase losses, torque is unaffected. However, no simple carrier-based PWM methods based on closed-form expressions have been presented for this purpose so far. Most importantly, x-y currents may be unacceptably large, due to the small x-y impedance. This is particularly troublesome when high fundamental voltage is needed continuously. Applying square waveform instead of PWM raises the fundamental from 23.1 to 27.3%. Given the square-voltage distortion, filters with large x-y impedance were devised for this approach. However, some square-waveform harmonics map into the torque-producing plane without attenuation, generating torque ripple. This article proposes to use a simple carrier-based PWM method in five-phase drives combined with a circulating-current filter. The x-y voltages, which see large filter impedance, are exploited to achieve a high DLU similar to previous solutions, but without torque ripple or excessive x-y currents. Guidelines are given for designing the filter when used with the presented PWM strategy. Experimental results verify the proposal.
Year
DOI
Venue
2021
10.1109/TIE.2020.2967705
IEEE Transactions on Industrial Electronics
Keywords
DocType
Volume
Carrier-based (CB) pulsewidth modulation (PWM),dc-bus utilization,multiphase ac drives,PWM converters,variable speed drives
Journal
68
Issue
ISSN
Citations 
2
0278-0046
0
PageRank 
References 
Authors
0.34
0
3
Name
Order
Citations
PageRank
Alejandro G. Yepes1678.88
Jesus Doval-Gandoy212718.84
Hamid A. Toliyat312626.32