Control-Based Two-Layer Protection for Short-Circuit Fault at an LVDC Feeder Branch

Jiajun Yang, Sebastian Brueske, Giampaolo Buticchi, Chunyang Gu, Sandro Guenter, Pat Wheeler

Research output: Journal PublicationArticlepeer-review

Abstract

Low-voltage dc distribution offers high efficiency for grid integration of dc-based technologies such as photovoltaic and battery storage systems and new loads such as charging stations for electric vehicles due to reduced number of conversion stages. However, the selection of protection devices, protection coordination and selectivity is still subject to research. This work proposes to use a two-layer protection technique utilizing the control capability of power converters in case of a shortcircuit fault at branch level of a low voltage dc feeder. The first layer is limiting the bus current using a virtual resistance in the droop control to avoid tripping of the grid-forming converter. The second layer implements a soft fuse tripping technique for selectivity. The control concept is presented and the system stability is analyzed using impedance-based stability analysis. Experimental results on a hardware-in-the-loop setup verify the findings.

Original languageEnglish
Article number4054
JournalEnergies
Volume15
Issue number11
DOIs
Publication statusPublished - 1 Jun 2022

Keywords

  • LVDC protection
  • current limiting
  • impedance model
  • power converters
  • stability analysis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Fuel Technology
  • Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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