Uninterruptible power supply including battery modules connected directly to direct current-alternating current inverter
First Claim
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1. An apparatus, comprising:
- an uninterruptible power supply (UPS) including;
a charger for rectifying an input alternating current (AC) voltage to generate a direct current (DC) charge;
a battery pack comprising a first string of battery modules and a second string of battery modules for storing the DC charge;
an inverter connected directly to the battery pack; and
a controller comprising;
a DC feedforward component configured to;
determine a state of health of the battery pack; and
determine, based on the state of health of the battery pack,an available amount of DC voltage to the inverter;
a reference voltage component configured to provide a reference voltage; and
a modulation index adjustment component configured to dynamically adjust a modulation index of the inverter, based on the available amount of DC voltage and based on the reference voltage, wherein an output AC voltage is generated by the inverter based on the dynamically adjusted modulation index of the inverter; and
the UPS is coupled to a device that operates according to a predefined threshold corresponding to the input AC voltage wherein;
the device draws power from the input AC voltage through the UPS while the input AC voltage is within the predefined threshold, andthe UPS activates the inverter when the input AC voltage is outside of the predefined threshold.
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Abstract
In an example, an apparatus includes a charger for rectifying a direct current charge from an input alternating current voltage. A battery pack stores the direct current charge in a first string of battery modules and a second string of battery modules. An inverter is connected directly to the battery pack and inverts the direct current voltage to an output alternating current voltage. In one example, the first string of battery modules is directly connected to the inverter in parallel with the second string of battery modules.
16 Citations
20 Claims
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1. An apparatus, comprising:
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an uninterruptible power supply (UPS) including; a charger for rectifying an input alternating current (AC) voltage to generate a direct current (DC) charge; a battery pack comprising a first string of battery modules and a second string of battery modules for storing the DC charge; an inverter connected directly to the battery pack; and a controller comprising; a DC feedforward component configured to; determine a state of health of the battery pack; and determine, based on the state of health of the battery pack, an available amount of DC voltage to the inverter; a reference voltage component configured to provide a reference voltage; and a modulation index adjustment component configured to dynamically adjust a modulation index of the inverter, based on the available amount of DC voltage and based on the reference voltage, wherein an output AC voltage is generated by the inverter based on the dynamically adjusted modulation index of the inverter; and the UPS is coupled to a device that operates according to a predefined threshold corresponding to the input AC voltage wherein; the device draws power from the input AC voltage through the UPS while the input AC voltage is within the predefined threshold, and the UPS activates the inverter when the input AC voltage is outside of the predefined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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an uninterruptible power supply (UPS) including; a charger for rectifying an input alternating current (AC) voltage to generate a direct current (DC) charge; a battery pack comprising a first string of battery modules and a second string of battery modules for storing the DC charge; an inverter, connected directly to the battery pack, inverting the DC charge to an output AC voltage; and a controller comprising; a DC feedforward component configured to; determine a state of health of the battery pack; and determine, based on the state of health of the battery pack, an available amount of DC voltage to the inverter; a reference voltage component configured to provide a reference voltage; and a modulation index adjustment component configured to dynamically adjust a modulation index of the inverter, based on the available amount of DC voltage and based on the reference voltage, wherein the output AC voltage is generated by the inverter based on the dynamically adjusted modulation index of the inverter; and the apparatus is coupled to a device that operates according to a predefined threshold corresponding to the input AC voltage, wherein the device draws power from the input AC voltage through the UPS while the input AC voltage is within the predefined threshold, and wherein the UPS activates the inverter when the input AC voltage is outside of the predefined threshold. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method comprising:
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operating an uninterruptible power supply (UPS) according to a predefined operating threshold corresponding to an input alternating current (AC) voltage, wherein a device draws power from the input AC voltage through the UPS while the input AC voltage is within a predefined threshold, wherein the UPS activates an inverter of the UPS when the input AC voltage is outside of the predefined threshold; drawing, by the inverter, a direct current (DC) voltage directly from a battery pack of the UPS, wherein the UPS comprises a controller that includes; a DC feedforward component configured to determine a state of health of the battery pack and determine, based on the state of health of the battery pack, an available amount of DC voltage to the inverter; a reference voltage component configured to provide a reference voltage; and a modulation index adjustment component configured to dynamically adjust a modulation index of the inverter, based on the available amount of DC voltage and based on the reference voltage; and generating, by the inverter, an output AC voltage based on the dynamically adjusted modulation index of the inverter. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification