Comprehensive comparison of THD and common mode leakage current of bipolar, unipolar and hybrid modulation schemes for single phase grid connected full bridge inverters

Yinglai Xia, Raja Ayyanar

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

7 Scopus citations

Abstract

This paper presents a comprehensive analysis and comparison among the three commonly used PWM schemes for single phase full bridge inverters namely, bipolar, unipolar and hybrid modulation schemes. The inductor current ripple and THD are analyzed using time domain analysis methods and the performance of the three modulation schemes are compared in detail for a range of modulation indices. An interesting result is that in order to achieve the same THD, compared with unipolar PWM, the average switching frequency (considering all the switches) of hybrid PWM is same but the average switching frequency of bipolar PWM needs to be around 3.6 times, when the modulation ratio is between 0.6 and 1. This results in the corresponding increase in the device switching losses. The common mode voltage between the negative terminals of the input and the grid, and the resulting leakage current are also analyzed and compared among the three schemes. Finally, a SiC MOSFETs based 1 kW full bridge inverter using the three modulation schemes has been built to validate the theoretical analysis. The inductor current ripple, THD and common mode leakage current analysis are verified through experiment.

Original languageEnglish (US)
Title of host publication2017 IEEE Applied Power Electronics Conference and Exposition, APEC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages743-750
Number of pages8
ISBN (Electronic)9781509053667
DOIs
StatePublished - May 17 2017
Event32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017 - Tampa, United States
Duration: Mar 26 2017Mar 30 2017

Other

Other32nd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2017
CountryUnited States
CityTampa
Period3/26/173/30/17

Keywords

  • Bipolar
  • Common mode leakage current
  • Hybrid
  • Modulation schemes
  • THD
  • Unipolar

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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