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Enhanced Interpolated Dynamic DFT Synchrophasor Estimator Considering Second Harmonic Interferences †.

Lei Chen1, Wei Zhao2, Fuping Wang3

  • 1Department of Electrical Engineering, Tsinghua University, Beijing 100084, China. l-chen15@mails.tsinghua.edu.cn.

Sensors (Basel, Switzerland)
|August 24, 2018
PubMed
Summary

A new enhanced synchrophasor estimator (e-IpD2FT) effectively suppresses second harmonics in distribution networks. This method achieves fast response and high accuracy, even with short observation windows.

Keywords:
digital filterdiscrete Fourier transform (DFT)interpolated dynamic DFTsecond harmonic interferencesynchrophasor estimation

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Area of Science:

  • Electrical Engineering
  • Power Systems

Background:

  • Phasor measurement units (PMUs) are crucial for monitoring and control in future distribution networks (DNs).
  • Power electronic devices in DNs introduce significant harmonics, particularly second harmonics, impacting synchrophasor estimation accuracy.
  • Short observation windows are necessary for fast PMU response but exacerbate harmonic interference.

Purpose of the Study:

  • To develop an enhanced synchrophasor estimator (e-IpD2FT) that mitigates second harmonic interference in distribution networks.
  • To improve the accuracy and response time of synchrophasor estimation under harmonic-rich conditions.

Main Methods:

  • Introduced an enhanced interpolated dynamic discrete Fourier transform (e-IpD2FT) estimator.
  • Derived adaptive equivalent filters for the interpolated dynamic discrete Fourier transform (IpD2FT).
  • Employed an enumeration method to identify optimal frequencies for minimizing second harmonic interference.

Main Results:

  • The e-IpD2FT demonstrated superior second harmonic suppression compared to the standard IpD2FT.
  • The proposed estimator met P-class response time requirements.
  • The e-IpD2FT satisfied most M-class accuracy requirements of IEEE standard C37.118.1 within a three-cycle window.

Conclusions:

  • The e-IpD2FT offers a robust solution for accurate synchrophasor estimation in distribution networks with significant harmonic content.
  • This enhanced method enables fast and accurate grid monitoring essential for modern power systems.