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Impact of parasitic and load current on the attenuation of motor terminal overvoltage in SiC-based drives

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journal contribution
posted on 11.01.2022, 15:14 by Wenzhi Zhou, Mohamed DiabMohamed Diab, Xibo Yuan
In SiC-based adjustable speed drives, the high voltage slew rate (𝒅𝒗/𝒅𝒕) of the switching transitions results in excessive overvoltage at the motor terminals due to the reflected voltages across the drive power cables. Besides the cable length, the switching rise/fall times of the voltage pulses are a key parameter to quantify the motor overvoltage in PWM inverter-fed drives. These times are varying depending on the load current and parasitic elements of SiC MOSFETs, that is, a standard two-level converter typically results in a non-uniform overvoltage envelop at the motor terminals. This article analyses the switching mechanism of the two-level converter considering the impact of SiC parasitic elements and load current showing how they affect the motor overvoltage in cable-fed drives. The analysis is then extended to the mitigation of the motor overvoltage using quasithree-level (Q3L) modulation as a candidate filter-less approach with a T-type converter. The theoretical analysis is validated through experimental tests by using the Q3L T-type converter. The analysis and results show that the instantaneous load current value critically determines the peak motor overvoltage, while it allows either a full or partial overvoltage mitigation when the Q3L modulation is adopted.

Funding

Insulation degradation and lifetime of inverter-fed machines with fast switching (high dv/dt) converters

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Transactions on Industry Applications

Pages

1 - 1

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Version

AM (Accepted Manuscript)

Rights holder

Β© IEEE

Publisher statement

Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Acceptance date

01/01/2022

Publication date

2022-01-10

ISSN

0093-9994

eISSN

1939-9367

Language

en

Depositor

Dr Mohamed Diab. Deposit date: 11 January 2022