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Energies
Volume 13
Issue 3
10.3390/en13030607
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Article

New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives

by
Markel Fernandez
1,*,
Andres Sierra-Gonzalez
2,
Endika Robles
1,
Iñigo Kortabarria
1,
Edorta Ibarra
1 and
Jose Luis Martin
1
1
Derpartment of Electronic Technology, University of the Basque Country (UPV/EHU), Plaza Ingeniero Torres Quevedo 1, 48013 Bilbao, Spain
2
Tecnalia Research and Innovation, C. Mikeletegi 7, 20009 Donostia, Spain
*
Author to whom correspondence should be addressed.
Energies 2020, 13(3), 607; https://doi.org/10.3390/en13030607
Submission received: 29 November 2019 / Revised: 27 January 2020 / Accepted: 29 January 2020 / Published: 31 January 2020
(This article belongs to the Special Issue Advances in Rotating Electric Machines)
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Abstract

Star-connected multiphase AC drives are being considered for electromovility applications such as electromechanical actuators (EMA), where high power density and fault tolerance is demanded. As for three-phase systems, common-mode voltage (CMV) is an issue for multiphase drives. CMV leads to shaft voltages between rotor and stator windings, generating bearing currents which accelerate bearing degradation and produce high electromagnetic interferences (EMI). CMV effects can be mitigated by using appropriate modulation techniques. Thus, this work proposes a new Hybrid PWM algorithm that effectively reduces CMV in five-phase AC electric drives, improving their reliability. All the mathematical background required to understand the proposal, i.e., vector transformations, vector sequences and calculation of analytical expressions for duty cycle determination are detailed. Additionally, practical details that simplify the implementation of the proposal in an FPGA are also included. This technique, HAZSL5M5-PWM, extends the linear range of the AZSL5M5-PWM modulation, providing a full linear range. Simulation results obtained in an accurate multiphase EMA model are provided, showing the validity of the proposed modulation approach.
Keywords: multiphase electric drives; CMV; modulation techniques; PWM multiphase electric drives; CMV; modulation techniques; PWM

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MDPI and ACS Style

Fernandez, M.; Sierra-Gonzalez, A.; Robles, E.; Kortabarria, I.; Ibarra, E.; Martin, J.L. New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives. Energies 2020, 13, 607. https://doi.org/10.3390/en13030607

AMA Style

Fernandez M, Sierra-Gonzalez A, Robles E, Kortabarria I, Ibarra E, Martin JL. New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives. Energies. 2020; 13(3):607. https://doi.org/10.3390/en13030607

Chicago/Turabian Style

Fernandez, Markel, Andres Sierra-Gonzalez, Endika Robles, Iñigo Kortabarria, Edorta Ibarra, and Jose Luis Martin. 2020. "New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives" Energies 13, no. 3: 607. https://doi.org/10.3390/en13030607

APA Style

Fernandez, M., Sierra-Gonzalez, A., Robles, E., Kortabarria, I., Ibarra, E., & Martin, J. L. (2020). New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives. Energies, 13(3), 607. https://doi.org/10.3390/en13030607

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