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<p>The widespread adoption of renewable energy sources has altered the nature of fault currents, which has decreased the reliability of the traditional transmission line protection system compared to synchronous generator-based sources, and the dynamic fault current characteristics of converter-interfaced wind farms provide a challenge to widely used directional relaying techniques. The problems with the existing phasor-based angle and amplitude directional relay algorithms for lines connecting to doubly-fed induction generator (DFIG-WF) wind farms are examined in this work. This approach computes the DQ information using the Clarke transformation and only uses local end current information. Subsequently, in order to mitigate the effect of DFIG-WFs on directional relaying techniques, a superimposed instantaneous frequency of the complex current signal is calculated using ensemble empirical mode decomposition-based Hilbert Huang transform (EEMD-HHT). The PSCAD/EMTDC program is used for an assessment study that takes into account various worst-power system scenarios and wind farm output power. The reliability and security of the suggested protection mechanism under various test scenarios are highlighted by the simulation results. Results obtained using the proposed method are compared to various existing directional schemes to prove the accuracy, efficiency, and adaptability of the proposed method.</p>

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A novel instantaneous current frequency-based directional relaying protection scheme for DFIG connected transmission line

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Md.Kaisar Azam Ansari,
  • Savita Nema

摘要

The widespread adoption of renewable energy sources has altered the nature of fault currents, which has decreased the reliability of the traditional transmission line protection system compared to synchronous generator-based sources, and the dynamic fault current characteristics of converter-interfaced wind farms provide a challenge to widely used directional relaying techniques. The problems with the existing phasor-based angle and amplitude directional relay algorithms for lines connecting to doubly-fed induction generator (DFIG-WF) wind farms are examined in this work. This approach computes the DQ information using the Clarke transformation and only uses local end current information. Subsequently, in order to mitigate the effect of DFIG-WFs on directional relaying techniques, a superimposed instantaneous frequency of the complex current signal is calculated using ensemble empirical mode decomposition-based Hilbert Huang transform (EEMD-HHT). The PSCAD/EMTDC program is used for an assessment study that takes into account various worst-power system scenarios and wind farm output power. The reliability and security of the suggested protection mechanism under various test scenarios are highlighted by the simulation results. Results obtained using the proposed method are compared to various existing directional schemes to prove the accuracy, efficiency, and adaptability of the proposed method.