Operation and control of a galvanically isolated three-phase AC-AC converter for solid state transformer applications is described. The converter provides bidirectional active power control and independent reactive power control at primary and secondary terminals. The converter hardware and control approach support conversion between AC systems with differing voltage magnitude, phase angle, and frequency. This functionality is achieved in a single conversion stage with low component count and high efficiency. Converter operation is demonstrated in simulations and preliminary results from a hardware prototype.
