Variable-frequency generator set integrated system driven by internal combustion engine

A variable-frequency generator set integrated system driven by an internal combustion engine, the variable-frequency generator set integrated system comprising a permanent magnet generator and an inverter device, and the permanent magnet generator comprising a permanent magnet generator stator and a permanent magnet generator rotor arranged in a clearance fit, wherein winding coils on the permanent magnet generator stator are all three-phase winding coils, the inverter device comprises an AC-DC rectification and voltage stabilization unit, a DC-AC variable-frequency inverter unit, a DC-DC conversion unit, and a control unit, an input end of the AC-DC rectification and voltage stabilization unit is connected with the three-phase winding coils of the permanent magnet generator stator, a first output end of the AC-DC rectification and voltage stabilization unit is connected with the DC-AC variable-frequency inverter unit, the DC-AC variable-frequency inverter unit is configured to invert a first DC power source rectified by the AC-DC rectification and voltage stabilization unit to output an AC power, a second output end of the AC-DC rectification and voltage stabilization unit is connected with the DC-DC conversion unit, the DC-DC conversion unit is configured to convert a second DC power source rectified by the AC-DC rectification and stabilization unit to obtain a plurality of DC power sources with different voltages, and the plurality of DC power sources are used to supply power to the control unit and directly output DC power.