Toward Large-Signal Stabilization of Floating Dual Boost Converter-Powered DC Microgrids Feeding Constant Power Loads

Pengfeng Lin, Wentao Jiang, Jinyu Wang, Donghan Shi, Chuanlin Zhang, Peng Wang

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

In modern dc microgrids (MGs), floating dual boost converters (FDBCs) take the advantages of both interleaved modulations and higher voltage gains, and the FDBC topology has been shown rather suitable for high-power applications. For a given dc MG, those power electronic loads and motor drives would behave as constant power loads (CPLs) that have negative incremental input impedances causing serious stability issues. To make the FDBC-enabled dc MG more adaptable to the increasing penetration of CPLs, this article proposes a compound stabilizer that is capable to stabilize all states in the converter in the large-signal sense. The stabilizer is synthesized by nonlinear disturbance observers and a recursive backstepping controller. The observers provide disturbance estimations to the controller, which neutralizes the disturbances in a feedforward manner and also guarantees the large-signal stabilization of MG under Lyapunov theorems. Practical parameter identification procedures are provided, and it is shown that the proposed stabilizer contributes the wider stability margin to the FDBC than the commonly used proportional-integral (PI) control. Finally, hardware experimentations substantiate the effectiveness and feasibility of the large-signal stabilizer.

Original languageEnglish
Article number8913535
Pages (from-to)580-589
Number of pages10
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume9
Issue number1
DOIs
StatePublished - Feb 2021
Externally publishedYes

Keywords

  • Compound stabilizer
  • dc power system
  • floating dual boost converter (FDBC)
  • large-signal stabilization
  • nonlinear disturbance observer

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