A Convenient Form to Connect Single-Phase Cells to Multi-pulse Transformers in Unbalanced Systems
Carlos Baier, Alumno de Doctorado en Ingeniería Eléctrica del D.I.E., nos presentará sus avances en su tesis, el Jueves 22 de Noviembre a las 16:00 hrs, en las dependencias de nuestro laboratorio.
This work shows that the proper connection of single-phase-input/single-phase-
output power cells to a multi-pulse transformer to form a 7-levels voltage waveform has an
important impact on the overall performance of the topology. Particularly, if the topology is
used in systems that are connected to an unbalanced AC network and/or feeds an
unbalanced load. The topology in combination with a proposed arrange of the power cells
and the multi-pulse transformer becomes best suitable for applications where the quality of
the voltage and current waveforms are of main concern. In fact, the topology minimizes the
problems produced by unbalanced loads even though the single-phase nature of both the
input and output of the power cells. Moreover, the proposed arrange acts as a buffer for the
AC mains voltage unbalances as they do not have any effect on the load voltages. The
presentation includes the comparison between a reported alternative to arrange the cells
with the proposed approach. Particularly, the voltages and currents are shown for both an
unbalanced AC mains and an unbalanced load. Unbalance and distortion factors are
included to quantify the advantages of the proposed arrange.