Performance evaluation of a five-level flying capacitor converter with reduced DC bus capacitance under two different modulation schemes

Amer M. Y. M. Ghias, Mihai Ciobotaru, Josep Pou, Vassilios G. Agelidis

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

6 Citations (Scopus)

Abstract

A back-to-back HVDC converter system is typically used to connect two separate electrical grids or a remote large-scale renewable energy system with the electrical grid through a DC bus. The DC bus typically contains a large electrolytic capacitor giving a robust performance to the converter system. However, it is well known that the electrolytic DC bus capacitor is bulky and has a low reliability. Therefore, a possible solution to these drawbacks is to use a reduced DC bus capacitance, which will allow film capacitors to be used instead of electrolytic capacitors. This paper presents the performance evaluation of a five-level flying capacitor (FC) back-to-back converter system with reduced DC bus capacitance under different modulation schemes. Two carrier-based modulation strategies are studied, namely the phase shifted pulse-width modulation (PS-PWM) and the phase disposition pulse-width modulation (PD-PWM), along with their appropriate flying capacitor voltage balancing techniques. The classical synchronous reference frame control strategy has been implemented in order to provide DC bus voltage regulation and active/reactive power control. The performance of the two different modulation schemes is tested against the DC bus and FCs voltage ripples using the MATLAB/Simulink-PLECS software platform. The analyzed case studies demonstrate that the PS-PWM strategy is more suitable to operate the proposed FC converter system using reduced values for the DC bus and flying capacitors.
Original languageEnglish
Title of host publicationProceedings - 2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems
Subtitle of host publicationPEDG 2012
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages857-864
Number of pages8
ISBN (Electronic)9781467320238
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012 - Aalborg, Denmark
Duration: 25 Jun 201228 Jun 2012

Other

Other2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2012
CountryDenmark
CityAalborg
Period25/06/1228/06/12

Keywords

  • AC/DC converter
  • back-to-back system
  • DC/AC converter
  • FC multilevel converter
  • PD-PWM
  • PS-PWM
  • reduced DC-link capacitor
  • voltage balancing strategy

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