Comprehensive Loss Evaluation of Neutral-Point-Clamped (NPC) and T-Type Three-Level Invertersbased on a Circuit Level Decoupling Modulation.

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Abstract

In this paper, an efficiency comparison ofneutral-point-clamped (NPC) inverters and bipolar switch NPC(T-Type) inverters is studied and the result shows that the T-Type inverter is more efficient at lower switching frequencies.Nevertheless, its efficiency suffers when the switching frequencyincreases due to high switching loss of the equipped high voltagepower switches. In order to reduce switching loss and herebyenhance efficiency, a newly proposed circuit-level decouplingmodulation (CLDM) scheme is applied for these two widely usedthree-phase three-level inverters, as well as their correspondingloss analyses are addressed. The switching loss reduction isevaluated comprehensively undervariant modulation indices andload power factors. The analysis results reveal that the CLDM isan alternative discontinuouspulse-width modulation (DPWM)approach for inverters with high switching frequencies in orderto achieve superior output voltage quality without loweringefficiency.
Original languageEnglish
Title of host publicationProceedings of 2014 IEEE International Power Electronics and Application Conference and Exposition
PublisherIEEE
Publication date2014
Pages82-87
ISBN (Print)978-1-4799-6768-1
DOIs
Publication statusPublished - 2014
EventIEEE International Power Electronics and Application Conference and Exposition - Holiday Inn Shanghai Pudong Kangqiao, Shanghai, China
Duration: 5 Nov 20148 Nov 2014

Conference

ConferenceIEEE International Power Electronics and Application Conference and Exposition
LocationHoliday Inn Shanghai Pudong Kangqiao
CountryChina
CityShanghai
Period05/11/201408/11/2014

Keywords

  • Three-level inverter
  • NPC
  • T-Type
  • Switching losses
  • Modulation
  • PWM

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