A generation and distribution system comprises an adjustable-speed prime mover and a doubly-fed asynchronous alternating-current (AC) generator driven by the prime mover and having a first poly-phase circuit, e.g., a stator, and a second poly-phase circuit, e.g., a rotor. The system further includes a first AC bus electrically coupled to the first poly-phase circuit and configured to deliver AC power at a first AC voltage to multiple loads, and a second AC bus configured to deliver AC power at a second AC voltage to another group of loads, the second AC voltage being lower than the first. Finally, the system includes a poly-phase transformer having first windings electrically coupled to the first poly-phase circuit and the first AC bus and having second windings electrically coupled to the second AC bus, and a poly-phase AC-to-AC electronic converter circuit electrically coupled between the second poly-phase circuit and the second AC bus.