Methods and systems for power management of a hybrid electric powerplant

A power management system for a hybrid-electric powerplant (HEP) comprising a thermal engine and an electric motor, the power management system comprising at least one controller having at least one processor and a memory coupled thereto, the memory having stored thereon program instructions executable by the at least one processor for:

• receiving a total power request for the HEP and determining, from the total power request, a thermal power request and an electric power request;
• converting the thermal power request into a thermal power command and the electric power request into an electric power command;
• transmitting the thermal power command to the thermal engine to generate a thermal power output;
• transmitting the electric power command to the electric motor to generate an electric power output;
• comparing the thermal power output to the thermal power command and the electric power output to the electric power command;
• detecting a fault when the thermal power output is greater than the thermal power command;
• and
• accommodating the fault by modulating the electric power command to provide a braking force using the electric motor to reduce a total power output from the HEP in response to the thermal power output being greater than the thermal power command.