Power transfer management for local power sources of a grid-tied load
First Claim
1. A method comprising:
- receiving, at a power converter, direct current (DC) power from a local power source, the local power source and the power converter electrically located on a same side of a point of connection to a utility power grid as a local load tied to the power grid, where the local load includes a consumer premises of the power grid;
converting with the power converter the DC power to alternating current (AC) power to deliver to the local load, including generating a reactive power component from the DC power, wherein generating the reactive power component includes generating an AC current waveform based on a reference waveform that represents an idealized output waveform having a phase relative to an AC voltage waveform of the power grid, and includes generating the AC current waveform out of phase with respect to the AC voltage waveform of the grid, based on a table-based phase adjustment; and
delivering the AC power on the local load side of the power grid.
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Accused Products
Abstract
A power transfer system provides power factor conditioning of the generated power. Power is received from a local power source, converted to usable AC power, and the power factor is conditioned to a desired value. The desired value may be a power factor at or near unity, or the desired power factor may be in response to conditions of the power grid, a tariff established, and/or determinations made remotely to the local power source. Many sources and power transfer systems can be put together and controlled as a power source farm to deliver power to the grid having a specific power factor characteristic. The farm may be a grouping of multiple local customer premises. AC power can also be conditioned prior to use by an AC to DC power supply for more efficient DC power conversion.
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Citations
18 Claims
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1. A method comprising:
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receiving, at a power converter, direct current (DC) power from a local power source, the local power source and the power converter electrically located on a same side of a point of connection to a utility power grid as a local load tied to the power grid, where the local load includes a consumer premises of the power grid; converting with the power converter the DC power to alternating current (AC) power to deliver to the local load, including generating a reactive power component from the DC power, wherein generating the reactive power component includes generating an AC current waveform based on a reference waveform that represents an idealized output waveform having a phase relative to an AC voltage waveform of the power grid, and includes generating the AC current waveform out of phase with respect to the AC voltage waveform of the grid, based on a table-based phase adjustment; and delivering the AC power on the local load side of the power grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An inverter apparatus comprising:
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input hardware to receive a direct current (DC) power from a local power source, the local power source and the inverter electrically located on a same side of a point of connection to a utility power grid as a local load tied to the power grid, where the local load includes a consumer premises of the power grid, including the inverter hardware to generate an AC current waveform based on a reference waveform that represents an idealized output waveform having a phase relative to an AC voltage waveform of the power grid; inverter hardware to convert the DC power to alternating current (AC) power to deliver to the local load, including generate a reactive power component from the DC power and generate the AC current waveform out of phase with respect to the AC voltage waveform of the grid, based on a table-based phase adjustment; and output hardware to deliver the AC power on the local load side of the power grid. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification