An estimation algorithm for an independent frequency load modeling in the presence of harmonics

Abstract EN

This paper presents a new application to the least errors squares (LES) algorithm for independent frequency load modeling in the presence and absence of harmonics in the time domain.

The proposed algorithm assumes that the harmonics content of both load voltage and current waveforms are known in advance, and uses the digitized samples of these wave forms, as well as their derivatives w.r.t.

time, to estimate the equivalent load parameters (R, L, C parameters).

The residual current source, which is the current resulting from the mismatch between the load voltage and load current at different harmonic frequencies, is calculated.

Furthermore, the black-box current source, which is the current resulting from the uncommon harmonics in the voltage and current waveforms, is also determined.

Simulated results are presented for matching the voltage and current waveforms, as well as mismatching.

Finally, results for actual recorded data for a nonlinear load in a power system are also presented.