Parallel variable speed generator control

A hybrid electric vehicle (HEV) comprising:

• an internal combustion engine having an output shaft;
• at least two generators mechanically coupled to the same output shaft;
• at least two inverters connected to the at least two generators, respectively, each generator respectively producing three phase AC, each inverter providing DC power to a DC link;
• and
• a system processor connected to the internal combustion engine and the at least two inverters via a controller area network (CAN), the system processor configured to issue a common speed command to each inverter via the CAN to achieve a target power level,
• each inverter comprises a processor configured to control the corresponding generator, the processor is configured to receive the common speed command from the processor, adjust the common speed command based on a speed of the same output shaft to create a droop, determine a torque command based on the adjusted speed command and supply the determined torque command to the respective generator.