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

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.

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The different versions of the original document can be found in:

• http://hdl.handle.net/11583/2700854 under the license https://creativecommons.org/licenses/by

• https://www.mdpi.com/1996-1073/11/2/443/pdf

• http://www.mdpi.com/1996-1073/11/2/443,

https://doaj.org/toc/1996-1073 under the license cc-by

• http://www.mdpi.com/1996-1073/11/2/443/pdf,

http://dx.doi.org/10.3390/en11020443

• https://iris.polito.it/handle/11583/2700854,

https://core.ac.uk/display/153686690,

https://academic.microsoft.com/#/detail/2793107551 under the license https://creativecommons.org/licenses/by/4.0/