System controller for a hybrid aircraft propulsion system

1. A method for controlling power sources in an electrical system, the method comprising:

receiving, by a system controller, instantaneous operating parameters of a first power source and instantaneous operating parameters of a second power source,

wherein an electric load is configured to receive electrical power from the first power source and the second power source, and

wherein the first power source and the second power source are configured to share an amount of the electrical power to the electric load;

comparing, by the system controller, the received instantaneous operating parameters to respective operating limits of the first power source and of the second power source, wherein the respective operating limits are arranged in a hierarchy of respective priority levels;

generating, by the system controller, commands to control an amount of electrical power output by at least one of the first power source or the second power source based at least on both:

the comparison of the instantaneous operating parameters to the respective operating limits; and

the respective priority level of the respective operating limit.

2. The method of claim 1 , further comprising:

determining, by the system controller, respective margins between:

each respective instantaneous operating parameter of the instantaneous operating parameters; and

each respective operating limit associated with the respective instantaneous operating parameter; and

generating, by the system controller, the commands based on which respective instantaneous operating parameter is closest to the associated respective operating limit.

3. The method of claim 1 , further comprising receiving, by the system controller, data from the electric load regarding a power demand of the electric load, wherein the electric load comprises an electric motor driving a propeller or fan.

4. The method of claim 1 , wherein the instantaneous operating parameters comprise one or more of current, voltage, torque, or speed.

5. The method of claim 1 , wherein the operating limits comprise maximum current, minimum current, maximum torque, minimum torque.

6. The method of claim 5 , wherein the hierarchy of respective priority levels is:

first priority—minimum torque;

second priority—minimum current;

third priority—maximum current; and

fourth priority—maximum torque.

7. The method of claim 1 , wherein the first power source is a battery.

8. The method of claim 7 , wherein the battery performs functions of a voltage regulator for transient changes in power demand of the electric load.

9. The method of claim 8 , further comprising:

receiving, by the system controller, an operating temperature for a component of the electric system;

comparing, by the system controller, the operating temperature to a temperature limit, wherein the temperature limit is an operating limit of the operating limits arranged in the hierarchy of respective priority levels; and

generating, by the system controller, the commands based on the comparison of the operating temperature to the temperature limit.

10. The method of claim 9 , wherein the second power source is an electric generator.

11. The method of claim 1 , wherein the first power source and the second power source are electric generators.

12. An electrical system comprising:

two or more sources of electrical power;

an electrical load configured to receive the electrical power from the two or more power sources, wherein the two or more power sources are configured to share an amount of the electrical power to the electric load; and

a system controller configured to:

receive instantaneous operating parameters of the two or more power sources;

compare the received instantaneous operating parameters to respective operating limits of each of the two or more power sources, wherein the respective operating limits are arranged in a hierarchy of respective priority levels; and

select one of the two or more power sources to control based at least on both:

the comparison of the instantaneous operating parameters to the respective operating limits; and

the respective priority level of the respective operating limit;

generate commands to control the selected power source.

13. The system of claim 12 , wherein the at least one of the two or more power sources is an electric generator.

14. The system of claim 13 , wherein at least one of the two or more power sources is a battery.

15. The system of claim 14 , wherein the instantaneous operating parameters comprise battery current, battery voltage, generator torque, generator current, generator voltage, generator speed.

16. The system of claim 14 , wherein the operating limits comprise maximum battery current, minimum battery current, maximum generator torque, minimum generator torque.

17. The system of claim 12 , wherein the electric load comprises an electric motor.

18. The system of claim 12 , wherein the system controller is further configured to:

determine respective margins between:

each respective instantaneous operating parameter of the instantaneous operating parameters; and

each respective operating limit associated with the respective instantaneous operating parameter; and

generate the commands based on which respective instantaneous operating parameter is closest to the associated respective operating limit.

19. The system of claim 12 , wherein the system controller is further configured to:

receive an indication of a change in power demand of the electrical load;

select one of the two or more power sources to control based on the change in power demand; and

generate commands to control the selected power source.

20. A method for controlling power supplies in an electrical system having an electric motor, the power supplies including a battery and an electric generator, the method comprising:

receiving, by a system controller, instantaneous operating parameters of the battery and the electric generator,

wherein the electric motor is configured to receive electrical power from the battery and the electric generator, and

wherein the battery and the electric generator are configured to share an amount of the electrical power to the electric load;

comparing, by the system controller, the received instantaneous operating parameters to respective operating limits of the battery and electric generator, wherein the respective operating limits are arranged in a hierarchy of respective priority levels;

generating, by the system controller, commands to control at least one of the electric generator or the battery based at least on both:

the comparison of the instantaneous operating parameters to the respective operating limits; and

the respective priority level of the respective operating limit.