Adding and shedding loads using load levels to determine timing

• US 9,991,709 B2
• Filed: 11/04/2011
• Issued: 06/05/2018
• Est. Priority Date: 11/04/2011
• Status: Active Grant

• Current Assignee: Kohler Company
• Original Assignee: Kohler Company
• Inventors: Frampton, Isaac S., Bornemann, Kenneth R., Chiu, Harrison C.
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Saavedra, Emilio J
• Application Number:
  US13/289,131
• Publication Number:
  US 20130116847A1
• Time in Patent Office: 2,405 Days
• Field of Search: 700296
• CPC Class Codes: H02J 2310/12 The local stationary network supplying a household or a building
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: H02J 9/04 in which the distribution system is disconnected from the normal source and connected to a standby source
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/248 UPS systems or standby or emergency generators

Abstract

Some embodiments relate to a method of adding and shedding loads that are connected to a generator. The method includes determining whether a plurality of loads is being supplied with power by the generator and then determining the total load that the generator is supplying to the plurality of loads. The method further includes determining whether to change a number of the loads in the plurality of loads based on the amount of load L that is being supplied by the generator. The method further includes determining an amount of time T in which to change the number of loads in the plurality of loads based on the amount of load that is being supplied by the generator.

Claims

1. A method of adding and shedding loads that are connected to a generator, the method comprising:

determining whether a plurality of loads is being supplied with power by the generator;

determining the load that the generator is supplying to the plurality of loads;

determining whether to change a number of the loads in the plurality of loads based on the amount of load that is being supplied by the generator;

determining an amount of time in which to change the number of loads in the plurality of loads relative to the amount of load that is being supplied by the generator, wherein the amount of time to change the number of loads varies relative to an available load capacity for the generator for all possible loads within a particular load range of loads, and wherein determining an amount of time in which to further change the number of loads in the plurality of loads includes increasing the amount of time to increase the number of loads in the plurality of loads when a previous change of the number of loads decreased the number of loads; and

changing the number of loads based on the determined amount of time.

2. The method of claim 1, wherein determining whether a plurality of loads are being supplied with power by the generator includes monitoring the generator load.

3. The method of claim 2, wherein monitoring the generator load includes measuring the generator operating frequency, generator operating voltage, or generator operating current.

4. The method of claim 2, wherein monitoring the generator load includes monitoring the torque of a prime mover within the generator.

5. The method of claim 4, wherein monitoring the torque of a prime mover within the generator includes measuring fuel injection time duration within the generator.

6. The method of claim 4, wherein monitoring the torque of a prime mover within the generator includes measuring the intake manifold pressure within the generator.

7. The method of claim 4, wherein monitoring the torque of a prime mover within the generator includes measuring a position of a throttle within the generator.

8. The method of claim 1, wherein determining the load that the generator is supplying to the plurality of loads includes measuring the current that the generator is supplying to the plurality of loads.

9. The method of claim 1, wherein determining the load that the generator is supplying to the plurality of loads includes measuring the generator operating frequency.

10. The method of claim 1, wherein determining the load that the generator is supplying to the plurality of loads includes measuring the generator operating voltage.

11. The method of claim 1, determining the load that the generator is supplying to the plurality of loads includes monitoring the torque of a prime mover within the generator.

12. The method of claim 11, wherein monitoring the torque of a prime mover within the generator includes measuring fuel injection time duration within the generator.

13. The method of claim 11, wherein monitoring the torque of a prime mover within the generator includes measuring the intake manifold pressure within the generator.

14. The method of claim 11, wherein monitoring the torque of a prime mover within the generator includes measuring a position of a throttle within the generator.

15. The method of claim 1, wherein determining an amount of time in which to change the number of loads in the plurality of loads based on the amount of load that is being supplied by the generator includes increasing the number of loads based on an available load capacity of the generator.

16. The method of claim 15, wherein the available load capacity of the generator is a difference between a maximum loading threshold of the generator and a generator load at a particular point in time.

17. The method of claim 16, wherein the maximum loading threshold of the generator is adjustable by a user.

18. The method of claim 16, wherein the maximum loading threshold of the generator is based on a rating provided by a manufacturer of the generator.

19. The method of claim 15, wherein the amount of time to increase the number of loads will increase as the available load capacity decreases.

20. The method of claim 1, wherein determining an amount of time in which to change the number of loads in the plurality of loads based on the amount of load that is being supplied by the generator includes decreasing the number of loads based on an overload of the generator.

21. The method of claim 20, wherein the overload of the generator is a difference between a generator load at a particular point in time and a maximum loading threshold of the generator.

22. The method of claim 21, wherein the maximum loading threshold of the generator is adjustable by a user.

23. The method of claim 21, wherein the maximum loading threshold of the generator is based on a rating provided by a manufacturer of the generator.

24. The method of claim 21, wherein the amount of time to decrease the number of loads will decrease as the generator overload increases.

25. The method of claim 1, wherein determining an amount of time in which to change the number of loads in the plurality of loads based on the amount of load that is being supplied by the generator includes decreasing the number of loads based on generator operating frequency.

26. The method of claim 25, wherein the amount of time to decrease the number of loads will decrease as the generator operating frequency decreases.

27. A method of adding and shedding loads that are connected to a generator, the method comprising:

determining whether a plurality of loads is being supplied with power by the generator;

determining the load that the generator is supplying to the plurality of loads;

determining whether to change a number of the loads in the plurality of loads based on the amount of load is being supplied by the generator;

changing the number of loads in the plurality of loads;

determining an amount of time in which to further change the number of loads in the plurality of loads, wherein the amount of time is determined by whether the number of loads increases or decreases during the previous change of the number of loads, wherein determining an amount of time in which to further change the number of loads in the plurality of loads includes increasing the amount of time to increase the number of loads in the plurality of loads when the previous change of the number of loads decreased the number of loads; and

changing the number of loads based on the determined amount of time.

28. The method of claim 27, wherein determining an amount of time in which to further change the number of loads in the plurality of loads includes increasing the amount of time to decrease the number of loads in the plurality of loads when the previous change of the number of loads increased the number of loads.

29. The method of claim 27, wherein determining an amount of time in which to further change the number of loads in the plurality of loads includes decreasing the amount of time to increase the number of loads in the plurality of loads when the previous change of the number of loads increased the number of loads.

30. The method of claim 27, wherein determining an amount of time in which to further change the number of loads in the plurality of loads includes decreasing the amount of time to decrease the number of loads in the plurality of loads when the previous change of the number of loads decreased the number of loads.