Optimizing Instrument Transformer Performance through Adaptive Blind Equalization and Genetic Algorithms

Denise Fonseca Resende (), Leandro Rodrigues Manso Silva, Erivelton Geraldo Nepomuceno and Carlos Augusto Duque ()
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Denise Fonseca Resende: Department of Electrical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil
Leandro Rodrigues Manso Silva: Department of Electrical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil
Erivelton Geraldo Nepomuceno: Department of Eletronic Engineering, Maynooth University, W23 F2H6 Maynooth, Ireland
Carlos Augusto Duque: Department of Electrical Engineering, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil

Energies, 2023, vol. 16, issue 21, 1-17

Abstract: In real-world scenarios, deviations in the frequency response of instrumentation transformers can lead to distorted harmonic measurements, highlighting the critical role harmonic measurement plays in assessing power quality. The blind channel equalization technique offers a potential solution to improve the frequency response of a large number of instrumentation transformers already installed in substations. These transformers were designed to accurately measure only the fundamental phasor component. Therefore, in order to use them for harmonic phasor measurement, methodologies for reducing frequency distortion must be applied. In this work, we propose a novel approach to improve the frequency response of the instrument transformer using adaptive blind equalization. The blind technique can compensate for distortions caused by voltage and current transducers without requiring prior knowledge of input signals or circuit characteristics. The proposed methodology uses a Linear Prediction Filter to convert the colored noise present at the channel output into white noise. Furthermore, a genetic algorithm is used to find a pole to cancel possible zeroes present in the frequency response of some transducers. The main advantage of blind equalization with the genetic algorithm is its independence, operating without clear information about the channel or the input signal. Through extensive experimentation, we demonstrate the effectiveness of the proposed methodology in significantly reducing the absolute error in ratio and phase caused by current and voltage transformers. Simulated and laboratory experiments are presented in this paper.

Keywords: adaptive channel equalization; blind equalization; genetic algorithm; instrument transformers; power quality (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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