Battery Load Allocation in Parallel-Connected Uninterruptible Power Supply Systems
First Claim
1. A method of operating a subject uninterruptible power supply (UPS) of a UPS system comprising a plurality of UPSs connected in parallel at a load bus and configured to provide power thereto from respective batteries of a plurality of batteries, the method comprising:
- determining a difference between a variable indicative of battery capacity for a battery associated with the subject UPS and an average value of the variable for the plurality of batteries; and
controlling a power flow between the subject UPS and the load bus responsive to the determined difference.
4 Assignments
0 Petitions
Accused Products
Abstract
An uninterruptible power supply (UPS) of a UPS system including a plurality of UPSs connected in parallel at a load bus and configured to provide power thereto from respective batteries of a plurality of batteries is operated such that a difference between a variable, for example, battery voltage, indicative of battery capacity for a battery associated with the subject UPS and an average value of the variable for the plurality of batteries is determined and a power flow between the subject UPS and the load bus is controlled responsive to the determined difference. Controlling a power flow between the subject UPS and the load bus responsive to the determined difference may include, for example, controlling a phase of an inverter of the subject I 0 UPS responsive to the determined difference.
16 Citations
20 Claims
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1. A method of operating a subject uninterruptible power supply (UPS) of a UPS system comprising a plurality of UPSs connected in parallel at a load bus and configured to provide power thereto from respective batteries of a plurality of batteries, the method comprising:
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determining a difference between a variable indicative of battery capacity for a battery associated with the subject UPS and an average value of the variable for the plurality of batteries; and controlling a power flow between the subject UPS and the load bus responsive to the determined difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A UPS comprising:
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an inverter configured to transfer power between a battery and a load bus coupled to an output of the UPS; and a controller operatively coupled to the inverter and configured to determine a difference between a variable indicative of battery capacity for the battery and an average value of the variable for batteries associated with a plurality of UPSs coupled in parallel at the load bus and to adjust a power flow between the inverter and the load bus responsive to the determined difference. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A computer program product for operating subject UPS of a system comprising a plurality of UPSs connected in parallel at a load bus and configured to provide power thereto from respective batteries of a plurality of batteries, the computer program product comprising computer program code embodied in a computer-readable storage medium, the computer program code comprising:
program code configured to determine a difference between a variable indicative of battery capacity for a battery associated with the subject UPS and an average value of the variable for the plurality of batteries and to adjust a power flow between the subject UPS and the load bus responsive to the determined difference. - View Dependent Claims (18, 19, 20)
Specification