An improved inverse-time over-current protection method for microgrid with optimized acceleration and coordination

Liang Ji, Zhe Cao, Qiteng Hong, Xiao Chang, Yang Fu, Jiabing Shi, Yang Mi, Zhenkun Li

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Abstract

This paper presents an improved inverse-time over-current protection method based on the compound fault acceleration factor and the beetle antennae search (BAS) optimization method for microgrid. The proposed method can not only significantly increase the operation speed of inverse-time over-current protection but also improve the protection coordination by considering possible influential factors, in terms of microgrid operation modes, distributed generation (DG) integration status, fault types, and positions, which are marked as the most challenging problems for over-current protection of microgrid. In this paper, a new Time Dial Setting (TDS) of inverse-time protection is developed by applying a compound fault acceleration factor, which can notably accelerate the speed of protection by using low-voltage and short-circuit impedance during the fault. In order to improve protection coordination, the BAS algorithm is then used to optimize the protection parameters of pick up current, TDS and the inverse time curve shape coefficient. Finally, the case studies and various evaluations based on DIgSILENT/Power Factory are carried out to illustrate the effectiveness of the proposed method.
Original languageEnglish
Article number5726
Number of pages17
JournalEnergies
Volume13
Issue number21
DOIs
Publication statusPublished - 2 Nov 2020

Keywords

  • microgrid
  • distributed generation
  • inverse-time over-current protection
  • future network protection

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