Compensação distribuída série na mitigação harmônica em instalações comerciais

Abstract

Aligned with the fact and the recommended assumptions IEEE 519-2, that it is sufficient to reduce the harmonic content of the electrical systems just to the compatibility levels of equipment are submitted and are therefore not necessary to completely eliminate its harmonic content, this paper will provide recommendations to mitigate harmonic distortion, improving system capacity, availability and reliability while evaluates its economic viability. The studies are based on the development and application of an electronically controlled harmonic mitigation device based on the insertion of active series harmonic impedances in the electric network. These active harmonic impedances are inserted at specific frequency (or frequencies). Important advantages of the proposed system are: the reduced power converter rating and the utilization of coaxial transformers. In this opportunity, the active harmonic impedance device is applied to implement distributed harmonic mitigation strategies, leading to a flexible and cost-effective solution for industrial and commercial power systems applications. The desired overall results are investigated through modeling and simulation an actual commercial facility, based on the PTW - Power Tools for Windows/SKM. Harmonic distortions and harmonic sources data are measured in the considered facility, characterizing the situation before and after the implementation of seriesshunt compensation for harmonic mitigation. The proposed solution can also add the function of dynamic power factor correction banks on the triggering of the detuned arrangements, limiting the harmonic currents through the capacitors without the need to raise their voltage levels and to control the harmonic flow, with the objective of direct harmonics current to an electric way that don’t cause damage to the system components. The subject here discussed deals with general standard considerations when dealing with typical harmonic producing loads in commercial and industrial power systems.