Stability analysis of cascaded converters for bidirectional power flow applications

Harish Krishnamurthy, Raja Ayyanar

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

33 Scopus citations


This paper establishes the criteria to ensure stable operation of two-stage, bidirectional, isolated ac-dc converters. The bi-directional converter is analyzed in the context of a building block module (BBM) that enables a fully modular architecture for universal power flow conversion applications (AC-DC, DC-AC and DC-DC). The BBM consists of independently controlled ac-dc and isolated dc-dc converters that are cascaded for bidirectional power flow applications. The cascaded converters have different control objectives in different directions of power flow. This paper discusses methods to obtain the appropriate input and output impedances that determine stability in the context of bi-directional ac-dc power conversion. Design procedures to ensure stable operation with minimal interaction between the cascaded stages are presented. The analysis and design methods are validated through extensive simulation and hardware results.

Original languageEnglish (US)
Title of host publicationINTELEC 2008
Subtitle of host publication30th Annual International Telecommunications Energy Conference
StatePublished - Dec 30 2008
Event30th Annual International Telecommunications Energy Conference, INTELEC 2008 - San Diego, CA, United States
Duration: Sep 14 2008Sep 18 2008

Publication series

NameINTELEC, International Telecommunications Energy Conference (Proceedings)
ISSN (Print)0275-0473


Other30th Annual International Telecommunications Energy Conference, INTELEC 2008
Country/TerritoryUnited States
CitySan Diego, CA


  • Bidirectional power flow
  • Cascaded systems
  • Input and output impedance
  • Stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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