Method for controlling an electric accumulator unit

• US 8,427,108 B2
• Filed: 08/19/2010
• Issued: 04/23/2013
• Est. Priority Date: 08/19/2010
• Status: Active Grant

• Current Assignee: Hamilton Sundstrand Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Hamilton Sundstrand Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Swenson, Josh C., Nguyen, Vietson M.
• Primary Examiner(s): DIAO, M BAYE
• Application Number:
  US12/859,368
• Publication Number:
  US 20120043938A1
• Time in Patent Office: 978 Days
• Field of Search: 320/128, 320/166, 307/48
• US Class Current: 320/128
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence

Abstract

A power system has a generator, a variable load, and an electrical accumulator unit. The electrical accumulator unit stores power when the generator generates excess power, and supplements power from the generator when the generator generates insufficient power.

Claims

1. A power generation system comprising:

a generator;

a controller coupled to said generator such that said controller can control a power output of said generator;

a power bus connected to said generator such that said power bus receives electrical power from said generator; and

an electrical accumulator unit connected to said power bus such that said electrical accumulator unit is capable of storing power from said power bus and providing power to said power bus, said electrical accumulator unit further comprising an independent electrical accumulator unit controller, wherein said independent electrical accumulator unit controller comprises at least a first load-balancing sink mode and a second load-balancing source mode.

2. The power generation system of claim 1, wherein said independent electrical accumulator unit controller further comprises a power bus current sensor input.

3. The power generation system of claim 1, wherein said independent electrical accumulator unit controller further comprises a power bus voltage sensor input.

4. The power generation system of claim 1, wherein said independent electrical accumulator unit controller further comprises a maintenance mode.

5. The power generation system of claim 1, wherein said independent electrical accumulator unit controller further comprises a stand-by mode.

6. The power generation system of claim 1, wherein said independent electrical accumulator unit controller comprises a microcontroller.

7. The power generation system of claim 1, wherein said independent electrical accumulator unit controller comprises a digital signal processor.

8. The power generation system of claim 1, wherein said electrical accumulator unit is a low bandwidth source while in a load balancing source mode.

9. The power generation system of claim 1, wherein said electrical accumulator unit is a power bus voltage regulator while in said load balancing sink mode.

10. The power generation system of claim 1, wherein said generator is a voltage regulator while said electrical accumulator unit is in a load balancing source mode.

11. The power generation system of claim 1, wherein said controller is configured to cause excess energy generated by said load to be stored within the electrical accumulator unit during said load balancing sink mode.

12. A method for operating a power system comprising the steps of:

converting power from a generator into DC power format;

providing said DC power to a power bus;

detecting a power characteristic on said power bus using a sensor;

operating a connected electrical accumulator unit in at least one of a load-balancing sink mode, a load-balancing source mode, a maintenance mode and a stand-by mode, wherein said mode is determined at least in part based on said detected power characteristic;

placing said electrical accumulator unit in a load balancing sink mode when said detected power characteristic exceeds a first threshold;

operating said electrical accumulator unit as a power bus voltage regulator while in said load balancing sink mode; and

controlling said connected electrical accumulator unit using an independent electrical accumulator unit controller.

13. The method of claim 12, wherein said detected power characteristic is a power bus current.

14. The method of claim 13, further comprising the step of providing stored power to said power bus when said detected power characteristic is flowing in a reverse direction.

15. The method of claim 14, wherein said power characteristic flowing in a reverse direction comprises a regenerative current.

16. The method of claim 13, further comprising the step of detecting a charge status of an energy storage component when said power bus current is below a threshold and said detected power characteristic is not flowing in a reverse direction.

17. The method of claim 16, further comprising the step of outputting a low level constant current from said electrical accumulator unit to said power bus when said energy storage component charge exceeds an overcharge threshold.

18. The method of claim 16, further comprising the step of said electrical accumulator unit drawing a constant current input from said power bus when said energy storage component charge is below an undercharge threshold.

19. The method of claim 16, further comprising the step of placing said electrical accumulator unit in a standby mode when said energy storage component charge is between an undercharge threshold and an overcharge threshold.

20. The method of claim 16, further comprising the step of operating said generator as a power bus voltage regulator when said detected power characteristic is below a threshold and said detected power bus characteristic is not flowing in a reverse direction.

21. The method of claim 12, further comprising the step of accepting and storing power from said power bus in said electrical accumulator unit when said detected power characteristic exceeds a threshold.

22. The method of claim 21, further comprising the step of operating said generator as a power bus voltage regulator when said detected power characteristic exceeds the threshold.

23. The method of claim 22, wherein said step of placing said electrical accumulator unit in a load balancing sink mode when said detected power characteristic exceeds a first threshold occurs when said detected power characteristic is flowing in a reverse direction.

24. The method of claim 12, further comprising the step of placing said electrical accumulator unit in said load balancing source mode when said detected power characteristic falls below a second threshold.