In an embodiment, a power converter includes: a plurality of power amplifier units, each having: a plurality of slice each with a power conversion module including an AC/DC/AC converter; a mains controller to control the plurality of slices; and a feedback conditioning system coupled to the mains controller; a plurality of input contactors and a plurality of output contactors via which each of the plurality of power amplifier units is to couple between a transformer and a load; and a master controller coupled to the plurality of power amplifier units.