A robust algorithm for real-time phasor and frequency estimation under diverse system conditions

Babak Jafarpisheh, Anamitra Pal

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents a comprehensive approach for performing phasor and frequency estimation from voltage and/or current signals of the modern power system. Undesirable components, such as decaying DC, if present in the input signal, are first attenuated using a complex-gain filter. The initial estimates of phasor and frequency are obtained next using the discrete Fourier transform and an improved estimation of signal parameters via rotational invariance technique, respectively. Finally, the accuracy of phasor and frequency estimates are increased based on the identified system condition. Simulations performed to evaluate the proposed approach confirm that it can do fast and accurate estimation of phasor and frequency under diverse operating conditions, making it ideal for wide-area monitoring, protection, and control applications in power systems.

Original languageEnglish (US)
Article number7112
JournalEnergies
Volume14
Issue number21
DOIs
StatePublished - Nov 1 2021
Externally publishedYes

Keywords

  • Discrete Fourier transform (DFT)
  • Estimation of signal parameters via rotational invariance techniques (ESPRIT)
  • Frequency estimation
  • Phasor estimation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

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