A power based integrated protection scheme for active distribution networks against asymmetrical faults

Özveren F., Usta Ö.

Electric Power Systems Research, vol.218, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 218
  • Publication Date: 2023
  • Doi Number: 10.1016/j.epsr.2023.109223
  • Journal Name: Electric Power Systems Research
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Environment Index, INSPEC
  • Keywords: Asymmetrical fault, Integrated protection, Line & bus protection, Negative sequence reactive power, Unbalanced power
  • Istanbul Technical University Affiliated: Yes


This paper introduces a power-based integrated protection scheme for active distribution networks to provide protection against asymmetrical faults and over unbalanced conditions. The proposed scheme detects the fault by monitoring the degree of system unbalance and discriminates the fault using the direction of the negative sequence reactive power flow originated from the fault point. The unit characteristic of the new protection scheme eliminates the technical difficulties resulted from the concept of non-unit overcurrent protection and provides protection for both buses and lines of the active distribution networks. Extensive computer simulation studies are carried out to analyze the performance of the new protection scheme under different asymmetrical fault conditions. Simulation studies indicate that the new protection scheme provides very fast tripping as the primary protection and backup protection for the case of any communication failure and also un-cleared faults taking place outside the protection zone.