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Grid Frequency Measurement through a PLHR Analysis Obtained from an ELF Magnetometer.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Signal Processing

Background:

  • Power grid frequency stability is critical for reliable electricity supply across all sectors.
  • European standard EN 50160:2010 defines acceptable frequency limits for grid stability.
  • Accurate and reliable frequency measurement is essential for grid compliance and operational integrity.

Purpose of the Study:

  • To introduce a novel, non-invasive method for measuring power grid frequency.
  • To validate the accuracy of the proposed measurement technique against commercial analyzers.
  • To assess the real-time monitoring capabilities of the developed system.

Main Methods:

  • Development of an extremely low-frequency magnetometer for real-time electromagnetic field monitoring (0-2.2 kHz).
  • Application of Zero-crossing and Fast Fourier Transform (FFT) algorithms to analyze the magnetometer's output signal.
  • Comparative analysis of one month's data (May 2021) against a commercial power quality analyzer.

Main Results:

  • The Zero-crossing algorithm demonstrated superior performance, achieving a coefficient of determination (R²) of 0.9801 on May 3, 2021.
  • The indirect measurement method, analyzing power line harmonics radiation, showed satisfactory agreement with grid frequency.
  • The developed magnetometer effectively monitored electromagnetic fields produced by electrical installations.

Conclusions:

  • The proposed non-invasive method for grid frequency measurement through power line harmonics radiation analysis is effective.
  • The Zero-crossing algorithm provides a reliable and accurate means for indirect grid frequency calculation.
  • This technique offers a viable alternative for real-time grid frequency monitoring and validation.