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

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 \text{23.1}\%. For sinu...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2021-02, Vol.68 (2), p.960-971
Main Authors: Yepes, Alejandro G., Doval-Gandoy, Jesus, Toliyat, Hamid A.
Format: Article
Language:English
Subjects:
Carrier-based (CB) pulsewidth modulation (PWM)
Closed form solutions
Coils (windings)
Current carriers
dc-bus utilization
Exact solutions
Harmonic analysis
Impedance
Mathematical analysis
multiphase ac drives
Pulse duration modulation
Pulse width modulation
PWM converters
Ripples
Stator windings
Torque
Torque measurement
variable speed drives
Voltage distortion
Wave attenuation
Waveforms
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Summary: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 \text{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 \text{23.1} to \text{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
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2020.2967705