Optimizing variable DC link voltage for an induction motor drive under dynamic conditions

Srikanthan Sridharan, Philip T. Krein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Induction motor drives are conventionally operated with a fixed inverter dc-link bus voltage. However, low drive speeds will result in low modulation index and poor dc bus utilization of the inverter. Aperiodic current controllers, such as hysteresis controllers, exhibit increased switching frequencies and losses for higher dc-link voltages. These high switching frequencies can be avoided by dynamically varying the dc-link voltage according to drive operating conditions. In addition to reducing inverter switching losses, varying the dc-link voltage also reduces the switched voltage magnitude across inverter semiconductor switches, potentially increasing inverter reliability. In the proposed work, the link voltage is varied by using a front-end dc-dc buck converter. The link voltage command is derived using a loss minimization technique that uses flux and rotor speed commands to the drive. The effect of additional loss from the front-end converter on the total loss is also investigated. Simulation and experimental results indicate that a variable dc-link voltage supports substantial power electronics loss reduction in applications with highly varying speed conditions.

Original languageEnglish (US)
Title of host publication2015 IEEE Transportation Electrification Conference and Expo, ITEC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467367417
DOIs
StatePublished - Jul 23 2015
EventIEEE Transportation Electrification Conference and Expo, ITEC 2015 - Dearborn, United States
Duration: Jun 14 2015Jun 17 2015

Publication series

Name2015 IEEE Transportation Electrification Conference and Expo, ITEC 2015

Other

OtherIEEE Transportation Electrification Conference and Expo, ITEC 2015
CountryUnited States
CityDearborn
Period6/14/156/17/15

ASJC Scopus subject areas

  • Automotive Engineering
  • Electrical and Electronic Engineering
  • Transportation

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  • Cite this

    Sridharan, S., & Krein, P. T. (2015). Optimizing variable DC link voltage for an induction motor drive under dynamic conditions. In 2015 IEEE Transportation Electrification Conference and Expo, ITEC 2015 [07165783] (2015 IEEE Transportation Electrification Conference and Expo, ITEC 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ITEC.2015.7165783