AIMS Electronics and Electrical Engineering (Mar 2024)

A hybrid IDM using wavelet transform for a synchronous generator-based RES with zero non-detection zone

  • Mamun Mishra,
  • Bibhuti Bhusan Pati

DOI
https://doi.org/10.3934/electreng.2024006
Journal volume & issue
Vol. 8, no. 1
pp. 146 – 164

Abstract

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Increased use of renewable energy sources in distribution grids has led to the growing concern over unintentional islanding. Among the available islanding detection methods, the passive methods have larger non-detection zones and are susceptible to system faults. However, they have no effect on power quality like active methods. We present a hybrid method for the islanding detection of synchronous generator-based renewable energy sources. Here, the larger non-detection zone issue of the passive islanding detection method was reduced by combining it with a wavelet transform. The rate of change of a voltage unbalanced factor was computed from the sequence components of the renewable energy source terminal voltage. Then, the factor was analyzed using a wavelet transform, and a threshold for the factor was found. The robustness of the method was tested for several islanding as well as non-islanding situations. The efficacy of the method was also tested in multi-source test systems. From the analysis, it was observed that the proposed method was fast, reliable, and had a zero non-detection zone.

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