GENERATOR-RECTIFIER SYSTEM AND GRID INTERFACE

A generator-rectifier system and grid interface includes an active rectifier configured to accept an input from one of a plurality of ac ports of a multi-port permanent magnet synchronous generator. Passive rectifiers are connected to the others of the plurality of ac ports. Connections provide outputs of the active rectifier and the passive rectifiers. A first converter is controlled at a fixed duty ratio driven by the outputs to interface with a dc grid or at a low grid frequency switching waveform to create a grid frequency ac output to interface with an ac grid. A second converter is connected the output of the active rectifier, the second converter being controlled at a variable duty ratio to interface with the dc grid or an above grid frequency switching waveform to create an above grid frequency ac waveform to interface with an ac grid. Connections provide a serial stack of outputs of the first and second converters.