Abstract

PEREZ ABRIL, Ignacio  and  CABRAL LEITE, Jandecy. Frequency scan on phase-coordinates. Energética [online]. 2012, vol.33, n.1, pp. 35-45. ISSN 1815-5901.

The electric networks analysis has upgraded from the sequence components frame models to the phase- coordinates frame models. The formulation of the frequency scan method in a phase- coordinates frame, besides allowing for a more accurate modeling of unbalanced networks, allows the specification of harmonic injections of any type: single-phase or three-phase of the desired sequence. Therefore, it is possible to study the effect of the non-linear loads according to its features and connection to the circuit. This paper develops the phase-coordinates model of a distribution power system, considering the representation of three-phase transformer banks of three or two single-phase transformers, as well as other asymmetries that can be found in the electrical systems of industrial plants, commercial or service facilities. The frequency scan based on the presented model is tested with a simple example of a four-wire delta system that highlights the possibilities of the model.

Keywords : harmonic analysis; frequency scan; phase-coordinates.

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