Stability Constrained Efficiency Optimization for Droop Controlled DC-DC Conversion System

Lexuan Meng, Tomislav Dragicevic, Josep M. Guerrero, Juan Carlos Vasquez

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Abstract

Paralleled dc converter systems are widely used in distribution systems and uninterruptable power supplies. This paper implements a hierarchical control in a droop-controlled dc-dc conversion system with special focus on improving system efficiency which is dealt within the tertiary regulation. As the efficiency of each converter changes with output power, virtual resistances (VRs) are set as decision variables for adjusting power sharing proportion among converters. It is noteworthy that apart from restoring the voltage deviation, secondary control plays an important role to stabilize dc bus voltage when implementing tertiary regulation. Moreover, system dynamic is affected when shifting VRs. Therefore, the stability is considered in optimization by constraining the eigenvalues arising from dynamic state space model of the system. Genetic algorithm is used in searching for global efficiency optimum while keeping stable operation. Simulation results are shown to demonstrate the effectiveness of the method.
Original languageEnglish
Title of host publicationProceedings of the 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013
Number of pages6
PublisherIEEE Press
Publication date2013
Pages7222-7227
ISBN (Print)978-1-4799-0223-1
ISBN (Electronic)978-1-4799-0224-8
DOIs
Publication statusPublished - 2013
Event39th Annual Conference of the IEEE Industrial Electronics Society - Wien, Austria
Duration: 10 Nov 201313 Nov 2013

Conference

Conference39th Annual Conference of the IEEE Industrial Electronics Society
CountryAustria
CityWien
Period10/11/201313/11/2013
SeriesProceedings of the Annual Conference of the IEEE Industrial Electronics Society
ISSN1553-572X

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Keywords

  • DC-DC conversion system
  • Droop control
  • Virtual resistance
  • Genetic algorithm
  • Efficiency optimization
  • Stability

Cite this

Meng, L., Dragicevic, T., Guerrero, J. M., & Vasquez, J. C. (2013). Stability Constrained Efficiency Optimization for Droop Controlled DC-DC Conversion System. In Proceedings of the 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013 (pp. 7222-7227). IEEE Press. Proceedings of the Annual Conference of the IEEE Industrial Electronics Society https://doi.org/10.1109/IECON.2013.6700333