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Energies 2018, 11(2), 443; https://doi.org/10.3390/en11020443

PWM Carrier Displacement in Multi-N-Phase Drives: An Additional Degree of Freedom to Reduce the DC-Link Stress

Dipartimento Energia, Politecnico di Torino, 10129 Torino, Italy
These authors contributed equally to this work.
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Received: 18 November 2017 / Revised: 6 February 2018 / Accepted: 11 February 2018 / Published: 16 February 2018
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Abstract

The paper presents a particular Pulse Width Modulation (PWM) strategy to reduce the (Direct Current) DC-link capacitor stress for multi-n-phase drives. A multi-n-phase drive is composed of multiple independent systems of n inverter supplying a multi-n-phase electric machine. The paper focused on the investigation of the best phase shifting between carriers for a triple-3-phase drive compared to the 3-phase counterpart in order to reduce the capacitor bench design point. Simulation and experimental results show as the control technique proposed is able to reduce the value of the DC-link capacitor current in any operating condition including fault case. In this sense, the PWM carrier displacement appears like an additional degree of freedom that can be exploited in multi-n-phase drives but also in multi-motor application. View Full-Text
Keywords: DC-link stress; multiphase drives; pulse width modulation; motor drives; power capacitors; fault tolerance; electric vehicles DC-link stress; multiphase drives; pulse width modulation; motor drives; power capacitors; fault tolerance; electric vehicles
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Diana, M.; Ruffo, R.; Guglielmi, P. PWM Carrier Displacement in Multi-N-Phase Drives: An Additional Degree of Freedom to Reduce the DC-Link Stress. Energies 2018, 11, 443.

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