| Abstract |
Several AC/AC converter configurations are possible in order to regulate the power provided by a three-phase supply to an unbalanced resistive load. While certain configurations transmit the unbalance directly, others transmit an unbalance reduced to supply line. ln symmetrical control, grouping together the three single-phase AC/AC converters with common return conductor brings no reduction in unbalance. With the same control mode, delta-connected grouping of three single-phase AC/AC converters brings no reduction in the current of the three load phases, but the line supply currents are less unbalanced as homopolar component is not transmitted with these two assemblies, as each phase is separately controlled, an adapted control strategy enables the unbalance to be reduced on either the load or the source side. Even using a symmetrical control, the three-phase AC/AC converter reduces the unbalance. This converter, its operation and its characteristics will provide the subject of the paper. |
