THD analysis for a high frequency link SCR-based PWM inverter

Minjeong Kim, Robert Balog

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

1 Citation (Scopus)


Two commutation methods for an AC link inverter are compared in this paper. In a high frequency link inverter, a smaller size transformer can be used to provide galvanic isolation and voltage step-up instead of a bulky 60Hz transformer. Furthermore, an AC-link inverter removes one power conversion step that exists in a DC-link inverter. However, in the high frequency AC-link inverter, safe control of the AC-AC output stage, which converts the higher frequency link voltage into the lower frequency output voltage, is challenging. Conventionally, dead time is inserted when the output current changes direction. Previous results presented two different commutation methods which did not require dead time to guarantee safe commutation. In this paper, the total harmonic distortion (THD) values of the output current from the two commutation methods are compared at different switching frequencies, load inductance values and load resistance values. This paper finds that both methods are generally good. However, for some switching frequencies and some output load values, one method produces better quality output current than the other method, and in other switching frequencies and load conditions the other method produces better output current. Therefore, this paper concludes that if one of the commutation methods should be chosen, the switching frequency and the load values should be considered carefully in the design.

Original languageEnglish
Title of host publication2018 IEEE Texas Power and Energy Conference, TPEC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781538610060
Publication statusPublished - 9 Mar 2018
Event2nd IEEE Texas Power and Energy Conference, TPEC 2018 - College Station, United States
Duration: 8 Feb 20189 Feb 2018


Other2nd IEEE Texas Power and Energy Conference, TPEC 2018
CountryUnited States
CityCollege Station



  • commutation
  • High frequency AC-link inverter
  • THD

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

Cite this

Kim, M., & Balog, R. (2018). THD analysis for a high frequency link SCR-based PWM inverter. In 2018 IEEE Texas Power and Energy Conference, TPEC 2018 (Vol. 2018-February, pp. 1-6). Institute of Electrical and Electronics Engineers Inc..