A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control

Ahmed Elserougi, Ibrahim Abdelsalam, Ahmed Massoud, Shehab Ahmed

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper presents small-signal modeling, stability analysis, and controller design of a non-isolated bidirectional hybrid-modular DC-DC Converter for DC grid applications. The DC-DC converter can be used to interconnect two different DC voltage levels in a medium-/high-voltage DC grid. Half-bridge Sub-Modules (SMs) and a high-voltage valve are the main components of the converter. The high-voltage valve can be implemented via employing series-connected Insulated-Gate Bipolar Transistors (IGBTs). Operation with zero voltage switching of the involved high-voltage valve is feasible, i.e., there is no concern pertinent to dynamic voltage sharing among the series-connected IGBTs. The power is transferred from one side to another through the involved SMs, where their capacitors are connected in series across the high-voltage side, while they are connected sequentially across the low-voltage side. In this paper, the state-space averaging technique is employed to derive the small-signal model of the presented converter for controller design. Closed-form expression of the duty cycle-to-inductor current transfer function is extracted. Comparison between simulation results of the small-signal model and the detailed circuit model is presented to authenticate the accuracy of the derived small-signal model. Finally, a scaled-down prototype is used to verify the accuracy of the small-signal model.

Original languageEnglish
Article number8836552
Pages (from-to)132459-132471
Number of pages13
JournalIEEE Access
Volume7
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

DC-DC converters
Electric potential
Insulated gate bipolar transistors (IGBT)
Zero voltage switching
Controllers
Transfer functions
Capacitors
Networks (circuits)

Keywords

  • Converter modeling
  • dc grids
  • DC-DC converters
  • hybrid-modular converters
  • small-signal analysis

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)

Cite this

A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids : Small-Signal Modeling and Control. / Elserougi, Ahmed; Abdelsalam, Ibrahim; Massoud, Ahmed; Ahmed, Shehab.

In: IEEE Access, Vol. 7, 8836552, 01.01.2019, p. 132459-132471.

Research output: Contribution to journalArticle

Elserougi, Ahmed ; Abdelsalam, Ibrahim ; Massoud, Ahmed ; Ahmed, Shehab. / A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids : Small-Signal Modeling and Control. In: IEEE Access. 2019 ; Vol. 7. pp. 132459-132471.
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