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 by controlling a phase of an inverter of the subject UPS responsive to the determined difference, wherein adjustment of the phase of the inverter is limited responsive to the determined difference falling outside of a predetermined range.
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 UPS responsive to the determined difference.
10 Citations
15 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 by controlling a phase of an inverter of the subject UPS responsive to the determined difference, wherein adjustment of the phase of the inverter is limited responsive to the determined difference falling outside of a predetermined range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 by controlling a phase of the inverter responsive to the determined difference, wherein adjustment of the phase of the inverter is limited responsive to the determined difference falling outside of a predetermined range. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A computer program product for operating a 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 by controlling a phase of an inverter of the subject UPS responsive to the determined difference, wherein adjustment of the phase of the inverter is limited responsive to the determined difference falling outside of a predetermined range. - View Dependent Claims (14, 15)
Specification