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Información tecnológica

On-line version ISSN 0718-0764

Abstract

SUAREZ, J.A.; DI MAURO, G.F.; ANAUT, D.O.  and  AGUERO, C.A.. Partial Cancellation of Harmonic Currents Caused by Nonlinear Residential Loads. Inf. tecnol. [online]. 2005, vol.16, n.3, pp.63-70. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642005000300009.

The index of harmonic distortion of different single-phase residential loads is evaluated and the importance of the effects of attenuation and diversity on the evaluation of distortion indexes of a power distribution system, is analyzed. Starting from signals of currents registered in the laboratory, the loads were modeled as fixed current sources. Then they were combined and simulated with the Electromagnetic Transient Program (EMTP), determining the resulting index of harmonic distortion. With models of nonlinear loads inserted in a distribution system, the diversity and attenuation phenomena were evaluated, in the following cases: i) connection of identical loads (with equal and different powers), and ii) variations in the impedance parameters of the distribution network. The results verify the fact that the rejection of such phenomena can cause an overestimation (up to 40%) in the evaluation of harmonics in a distribution system.

Keywords : distortion voltage; simulation; harmonics; attenuation; nonlinear residential loads.

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