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Related Concept Videos

Phasor Arithmetics01:13

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Phasors and their corresponding sinusoids are interrelated, offering unique insights into the behavior of alternating current (AC) circuits. One way to understand this relationship is through the operations of differentiation and integration in both the time and phasor domains.
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Phasors are a powerful mathematical tool used to analyze alternating current (AC) circuits. They provide a complex number representation of sinusoids, with the magnitude of the phasor equating to the amplitude of the sinusoid and the angle of the phasor representing the phase measured from the positive x-axis.
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Phasor representation is a powerful tool used to transform the voltage-current relationship for resistors, inductors, and capacitors from the time domain to the frequency domain. This transformation simplifies the analysis of alternating current (AC) circuits.
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Harmonic Phasor Estimation Method Considering Dense Interharmonic Interference.

Xianyong Xiao1, Runze Zhou1, Xiaoyang Ma1

  • 1The College of Electrical Engineering, Sichuan University, Chengdu 610065, China.

Entropy (Basel, Switzerland)
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for accurate harmonic phasor estimation in power systems, even with dense interharmonic (DI) interference. The technique improves frequency resolution and noise immunity for reliable power quality analysis.

Keywords:
dense frequency signalharmonic analysisharmonic phasor estimationinterharmonics

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Area of Science:

  • Electrical Engineering
  • Power Systems Analysis
  • Signal Processing

Background:

  • Harmonic and interharmonic components with close frequencies often overlap due to limited frequency resolution and signal windowing.
  • Dense interharmonic (DI) components near harmonic spectrum peaks significantly reduce harmonic phasor estimation accuracy.

Purpose of the Study:

  • To propose a novel harmonic phasor estimation method that effectively accounts for DI interference.
  • To improve the accuracy of harmonic phasor estimation in the presence of significant interharmonic components.

Main Methods:

  • Utilizing spectral characteristics (phase and amplitude) to detect DI interference.
  • Establishing an autoregressive model based on signal autocorrelation for data extrapolation.
  • Enhancing frequency resolution and mitigating interharmonic interference through data extrapolation.

Main Results:

  • The proposed method accurately estimates harmonic phasor parameters even when DIs are present.
  • Demonstrated capability in improving frequency resolution and eliminating interharmonic interference.
  • Simulation and experimental results confirm the method's effectiveness and robustness.

Conclusions:

  • The developed method provides accurate harmonic phasor estimation in the presence of DI interference.
  • The technique exhibits good anti-noise capability and dynamic performance for power system monitoring.
  • This approach enhances the reliability of power quality analysis in complex electrical environments.