Source-independent Zone-1 protection for converter-dominated power networks

Subhadeep Paladhi, Jaisaikiran Reddy Kurre, Ashok Kumar Pradhan

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
27 Downloads (Pure)


Growing penetration of converter-interfaced renewable energy sources with numerous control operations results in non-homogeneous fault characteristics in the network. Distance relay Zone-1 operation with such non-homogeneous situation may be vulnerable compromising both dependability and security aspects. In this work, vulnerability analysis is carried out to identify the factors influencing Zone-1 performance in a renewable integrated power network, and a method is proposed to ensure its correct operation. The method considers the homogeneity present in negative and zero sequence networks with converter-based sources to obtain the faulted loop current angle using local measurements and to derive correct decisions. The proposed method is tested for different renewable integrated systems, even with 100% converter-based sources and with variations in different vulnerable factors. Comparison with available distance relaying techniques demonstrates the superior performance of the proposed method.
Original languageEnglish
Pages (from-to)341-351
Number of pages11
JournalIEEE Transactions on Power Delivery
Issue number1
Early online date1 Nov 2022
Publication statusPublished - 1 Feb 2024


  • renewable integrated power network
  • power network faults
  • distance relay
  • Zone-1 protection
  • power grids


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