Management Of Battery Capacity
First Claim
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1. A method for providing selective electricity grid modulation from a backup battery system for a facility which is connected to the grid, comprising:
- providing one or more batteries in the backup battery system;
providing a converter for converting from AC to DC for charging the batteries from the grid, and an inverter for converting from DC to AC to supply the facility load and to selectively supply the grid;
selectively connecting the inverter AC output to the grid and modulating to provide grid regulation;
designating at least some of the batteries for use as both a backup supply for said facility and for grid regulation;
designating a first part of a capacity of said batteries for use as a backup supply;
designating a second part of the capacity of said batteries for use for grid regulation; and
selectively charging the second part from the grid via the converter, or selectively discharging the second part via the inverter to the grid.
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Abstract
Disclosed is a battery cell system, which provides regulation service to the grid, as well as the battery being used as part of an uninterruptible power supply (UPS). Part of the capacity of the storage batteries may be used for regulation service, while maintaining a reserve of battery capacity to provide the UPS supply if required. An advantage is that the battery installation can be more effectively monitored as it is more regularly being charged and discharged.
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Citations
11 Claims
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1. A method for providing selective electricity grid modulation from a backup battery system for a facility which is connected to the grid, comprising:
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providing one or more batteries in the backup battery system; providing a converter for converting from AC to DC for charging the batteries from the grid, and an inverter for converting from DC to AC to supply the facility load and to selectively supply the grid; selectively connecting the inverter AC output to the grid and modulating to provide grid regulation; designating at least some of the batteries for use as both a backup supply for said facility and for grid regulation; designating a first part of a capacity of said batteries for use as a backup supply; designating a second part of the capacity of said batteries for use for grid regulation; and selectively charging the second part from the grid via the converter, or selectively discharging the second part via the inverter to the grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a storage battery, a method for automatically estimating the state of charge of a system, wherein for each string of cells, carrying out the steps of:
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receiving input string current and string voltage values; determining an offset voltage using a nominal cell impedance and the string current, and thereby determining an estimate of internal cell voltage; scaling the voltage range to produce an output and passing the output through a low pass filter to provide a voltage based state of charge measurement; in parallel, integrating the current values to provide a charge count; scaling the charge count to cell capacity, and passing the result through a high pass filter to provide a current based estimate of state of charge; and combining and averaging the current based estimate of state of charge with the voltage based estimate of state of charge, to provide an estimate of state of charge.
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Specification