New Modulation Technique to Mitigate Common Mode Voltage Effects in Star-Connected Five-Phase AC Drives
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2020
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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.
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Publisher Copyright: Ā© 2020 by the authors.
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Multiphase electric drives , CMV , Modulation techniques , PWM , Multiphase electric drives , CMV , Modulation techniques , PWM , Renewable Energy, Sustainability and the Environment , Building and Construction , Fuel Technology , Engineering (miscellaneous) , Energy Engineering and Power Technology , Energy (miscellaneous) , Control and Optimization , Electrical and Electronic Engineering , SDG 7 - Affordable and Clean Energy , Funding Info , This work has been supported in part by the Government of the Basque Country within the fund for research groups of the Basque University system IT978-16 and in part by the Government of the Basque Country within the research program ELKARTEK as the project ENSOL (KK-2018/00040). , This work has been supported in part by the Government of the Basque Country within the fund for research groups of the Basque University system IT978-16 and in part by the Government of the Basque Country within the research program ELKARTEK as the project ENSOL (KK-2018/00040).
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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 , vol. 13 , no. 3 , 607 , pp. 607 . https://doi.org/10.3390/en13030607