System and method of smart energy storage in a UPS

• US 10,331,153 B2
• Filed: 12/22/2011
• Issued: 06/25/2019
• Est. Priority Date: 12/22/2011
• Status: Active Grant

• Current Assignee: Schneider Electric IT Corporation (Schneider Electric SE)
• Original Assignee: Schneider Electric IT Corporation (Schneider Electric SE)
• Inventors: Fallon, Raymond M.
• Primary Examiner(s): Wathen, Brian W
• Assistant Examiner(s): McMenemy, Brian T
• Application Number:
  US14/366,493
• Publication Number:
  US 20140379160A1
• Time in Patent Office: 2,742 Days
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05F 1/66 Regulating electric power
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00006 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
• CPC Class Codes: H02J 2310/64 The condition being economic, e.g. tariff based load management
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004
• CPC Class Codes: H02J 9/062 for AC powered loads
• 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: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 20/12 Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
• 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
• CPC Class Codes: Y04S 40/12 characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

A method for controlling an uninterruptible power supply (UPS) having a battery includes powering a load coupled to the UPS using utility power, determining whether an energy cost associated with the utility power exceeds a threshold cost, determining whether a charge level of the battery exceeds a threshold charge level, and powering the load from the battery in response to determining that the energy cost exceeds the threshold cost and that the charge level of the battery exceeds the threshold charge level.

Claims

1. A method for controlling an uninterruptible power supply (UPS) having a battery, the method comprising acts of:

powering a load coupled to the UPS using utility power in a first operating mode of the UPS;

determining, by a controller of the UPS, in the first operating mode, whether an energy cost associated with the utility power exceeds a first threshold cost;

determining, by the controller, in the first operating mode, whether a charge level of the battery exceeds a threshold charge level;

automatically switching from the first operating mode to a second operating mode of the UPS, by the controller, to power the load from the battery in response to determining that the energy cost associated with the utility power exceeds the first threshold cost and that the charge level of the battery exceeds the threshold charge level;

determining, by the controller, in the first operating mode, whether an energy cost associated with the utility power is below a second threshold cost, the second threshold cost being lower than the first threshold cost;

automatically switching from the first operating mode to a third operating mode of the UPS, by the controller, to power the load from utility power while simultaneously charging the battery using utility power in response to determining that the energy cost associated with the utility power is below the second threshold cost;

determining, by the controller, in the first or second operating mode, whether the charge level of the battery is below a reserve charge level, the reserve charge level being lower than the threshold charge level; and

automatically switching from the first or second operating mode to the third operating mode of the UPS, by the controller, to power the load from utility power while simultaneously charging the battery using utility power in response to determining that the charge level of the battery is below the reserve charge level.

2. The method of claim 1, further comprising receiving, by the controller, an electric utility rate schedule through a communication network and determining, by the controller, one of the first threshold cost and the second threshold cost based on the electric utility rate schedule.

3. The method of claim 1, wherein the reserve charge level corresponds to a predetermined minimum amount of desired time the load can be powered by the battery.

4. The method of claim 1, further comprising calculating, by the controller, a cost savings based on an amount of time the load is powered from the battery and the energy cost.

5. The method of claim 4, wherein the cost savings is a first cost savings, wherein the amount of time is a first amount of time, and wherein the method further comprises calculating, by the controller, a second cost savings based on a second amount of time the battery is charged using utility power and the energy cost.

6. An uninterruptible power supply, comprising:

an input configured to receive utility power;

at least one battery;

an output configured to provide power to a load; and

a processor operatively coupled to the input, the at least one battery and the output, the processor configured to;

power the load from utility power in a first operating mode;

determine, in the first operating mode, whether an energy cost associated with the utility power exceeds a first threshold cost;

determine, in the first operating mode, whether a charge level of the at least one battery exceeds a threshold charge level;

automatically switch from the first operating mode to a second operating mode to power the load from the at least one battery in response to determining that the energy cost associated with the utility power exceeds the first threshold cost and that the charge level of the battery exceeds the threshold charge level;

determine, in the first operating mode, whether an energy cost associated with the utility power is below a second threshold cost, the second threshold cost being lower than the first threshold cost;

automatically switch from the first operating mode to a third operating mode to power the load from utility power while simultaneously charging the battery using utility power in response to determining that the energy cost associated with the utility power is below the first and second threshold cost;

determine in the first or second operating mode, whether the charge level of the at least one battery is below a reserve charge level, the reserve charge level being lower than the threshold charge level; and

automatically switch from the first or second operating mode to the third operating mode to power the load from utility power while simultaneously charging the at least one battery using utility power in response to determining that the charge level of the at least one battery is below a reserve charge level.

7. The uninterruptible power supply of claim 6, wherein the processor is operatively coupled to a communication network, and wherein the processor is further configured to receive an electric utility rate schedule through the communication network and determine one of the first threshold cost and the second threshold cost based on the electric utility rate schedule.

8. The uninterruptible power supply of claim 6, wherein the reserve charge level corresponds to a predetermined minimum amount of desired time the load can be powered by the at least one battery.

9. The uninterruptible power supply of claim 6, wherein the processor is further configured to calculate a cost savings based on an amount of time the load is powered from the at least one battery and the energy cost.

10. The uninterruptible power supply of claim 9, wherein the cost savings is a first cost savings, wherein the amount of time is a first amount of time, and wherein the processor is further configured to calculate a second cost savings based on a second amount of time the at least one battery is charged using utility power and the energy cost.

11. The uninterruptible power supply of claim 10, further comprising a user interface operatively coupled to the processor, wherein the user interface is configured to display a representation of at least one of the first cost savings and the second cost savings.

12. An uninterruptible power supply, comprising:

an input configured to receive utility power;

at least one battery;

an output configured to provide power to a load;

means for automatically powering the load from the input during periods of low energy rates, then automatically powering the load from the at least one battery during periods of high energy rates if a charge level of the at least one battery exceeds a threshold charge level, and continuing to power the load from the at least one battery until the charge level of the at least one battery drops below a reserve charge level that is lower than the threshold charge level, then automatically powering the load and charging the at least one battery from the input in response to the charge level of the at least one battery dropping below the reserve charge level; and

means for determining, while powering the load from the input, that an energy cost is less than a threshold cost and for charging the at least one battery from the input in response to determining that the energy cost is less than the threshold cost.

13. The uninterruptible power supply of claim 12, further comprising a network interface operatively coupled to the means for automatically powering the load, wherein the means for automatically powering the load is configured to receive an electric utility rate schedule using the network interface.

14. The uninterruptible power supply of claim 13, wherein the uninterruptible power supply is configured to automatically power the load from the at least one battery during periods of high energy rates and power the load from utility power during other periods based on the electric utility rate schedule.

15. The uninterruptible power supply of claim 14, wherein the uninterruptible power supply is configured to automatically charge the at least one battery during periods of low energy rates based on the electric utility rate schedule.

16. The uninterruptible power supply of claim 12, wherein the means for automatically powering the load is further configured to calculate a cost savings realized from powering the load from the at least one battery during periods of high energy rates.

17. The uninterruptible power supply of claim 12, wherein the reserve charge level corresponds to a predetermined minimum amount of desired time the load can be powered by the battery.