System and method for allocating power to loads

• US 7,786,617 B2
• Filed: 01/15/2009
• Issued: 08/31/2010
• Est. Priority Date: 09/28/2004
• Status: Active Grant

• Current Assignee: American Power Conversion Corporation (Schneider Electric SE)
• Original Assignee: American Power Conversion Corporation (Schneider Electric SE)
• Inventors: Deokar, Vishwas Mohaniraj, Donalds, James H., Haines, Lance Palmer, Paik, Nam Wook, Manganese, Michael
• Primary Examiner(s): RUTLAND WALLIS, MICHAEL
• Application Number:
  US12/354,240
• Publication Number:
  US 20090121547A1
• Time in Patent Office: 593 Days
• Field of Search: 307/64, 307/66
• US Class Current: 307/64
• CPC Class Codes: H01H 2300/018 Application transfer; between utility and emergency power supply circuits in H02J9/04
• CPC Class Codes: H02J 2310/58 The condition being electrical
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: H02J 9/06 with automatic change-over , e.g. UPS systems
• 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 20/20 End-user application control systems
• 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

A system and method for adaptive control of power among a plurality of loads based on a categorization of the loads as either delayable or non-delayable, wherein the non-delayable loads are preferably supplied power over the delayable loads. In one aspect, the system may be used to allocate limited power from a backup power source.

Claims

1. A method for controlling power supplied to a plurality of loads, the method comprising:

categorizing the plurality of loads into one of a first group identified as delayable loads and a second group identified as non-delayable loads;

allocating power to each load in the second group of loads;

allocating any remaining power to a plurality of loads in the first group of loads;

providing power to the plurality of loads in the first group of loads;

independently monitoring power provided to each load of the plurality of loads in the first group of loads;

detecting, based on the act of monitoring, an overload;

determining, in response to the overload, which at least one load of the plurality of loads in the first group of loads caused the overload; and

disconnecting, in response to determining, the at least one load of the plurality of loads in the first group of loads that caused the overload.

2. The method of claim 1, wherein allocating any remaining power to loads in the first group includes selecting loads from the first group to maximize use of the remaining power.

3. The method as claimed in claim 1, further comprising monitoring the plurality of loads in real-time and dynamically allocating the remaining power to the loads in the first group of loads.

4. The method as claimed in claim 3, wherein dynamically allocating includes characterizing each load in terms of peak power and steady-state power.

5. The method as claimed in claim 1, wherein at least one of the loads in the second group of loads is characterized as operable with one type of back-up source and wherein allocating power to the at least one load includes allocating power from only the one type of back-up source.

6. The method of claim 1, wherein categorizing the plurality of loads includes for each load identifying a load type, and using a default setting to categorize each load based on the load type.

7. The method of claim 6, further comprising allowing a user to change the default setting.

8. The method of claim 1, wherein categorizing the loads includes for each load identifying a load type, and wherein the method further includes setting default values for electrical parameters for each load based on the load type.

9. The method of claim 8, wherein the electrical parameters include a surge power rating and a steady state power rating.

10. The method of claim 8, further comprising allowing a user to change the default values for the electrical parameters.

11. The method of claim 8, further comprising updating values of the electrical parameters based on measured values.

12. The method of claim 1, further comprising monitoring power use to the plurality of loads while the plurality of loads are operating from a primary source of power, and providing a recommendation for a back-up source of power based on the power use.

13. A system for controlling power to a plurality of loads from a power source, the system comprising:

a first input to receive power from the power source;

a plurality of outputs to provide output power to the plurality of loads;

a circuit that selectively couples the first input to one or more of the plurality of outputs; and

a controller adapted to control the circuit to selectively provide power to the plurality of loads, wherein the controller is configured to control the circuit based on available power from the power source and based on a categorization of the plurality of loads as delayable or non-delayable,

wherein the controller is adapted to;

provide power to the plurality of loads;

independently monitor power provided to each load of the plurality of loads;

detect, based on the act of monitoring, an overload;

determine, in response to the overload, which at least one load of the plurality of loads caused the overload; and

disconnect, in response to determining, the at least one load of the plurality of loads that caused the overload.

14. The system of claim 13, wherein the controller is adapted to control the circuit to maximize use of the available power.