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Least squares based methods

Least squares based methods

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In this Chapter we discuss techniques used to fit faulted current and voltage waveforms, each to a sinusoidal waveform containing a fundamental component, a decaying/constant DC component and/or harmonics. These techniques use the least squares (LSQ) method to minimise the fitting error, and all have the common goal of extracting the fundamental components of voltage and current waveforms, to calculate the impedance to the fault or the comparison of current-based signals in digital differential protection.

Inspec keywords: least squares approximations; power system protection; power system harmonics

Other keywords: power system harmonics; voltage waveforms; sinusoidal waveform; least squares based methods; fitting error; digital differential protection; faulted current waveforms; power system protection

Subjects: Power system protection

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