SOLAR POWER CONDITIONING UNIT
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Abstract
The present invention relates to a power conditioning unit for delivering power from a dc power source to an ac output, particularly ac voltages greater than 50 volts, either for connecting directly to a grid utility supply, or for powering mains devices independent from the mains utility supply. We describe a power conditioning unit for delivering power from a dc power source to an ac mains output, the power conditioning unit comprising an input for receiving power from said dc power source, an output for delivering ac power, an energy storage capacitor, a dc-to-dc converter having an input connection coupled to said input and an output connection coupled to the energy storage capacitor, and a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled to said output, wherein said energy storage capacitor has a capacitance of less than twenty microfarads.
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Citations
48 Claims
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1-28. -28. (canceled)
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29. A power conditioning unit for delivering power from a DC power source to an AC circuit, the power conditioning unit comprising:
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a DC input for receiving power from the DC power source; an AC output for delivering AC power to the AC circuit; a non-electrolytic energy storage capacitor having a capacitance of less than twenty microfarads; a DC to DC converter having an input connection coupled to the DC input and an output connection coupled to the energy storage capacitor; and a DC to AC converter having an input connection coupled to the energy storage capacitor and an output connection coupled to the AC output. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A power conditioning unit (PCU) for delivering power from a solar photovoltaic DC power source to an AC mains, the PCU comprising:
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a first power conversion stage for voltage conditioning of power received from the solar photovoltaic DC power source; a second power conversion stage for injecting power into the AC mains; a non-electrolytic energy storage capacitor having a capacitance of less than twenty microfarads coupled between the first power conversion stage and the second power conversion stage to buffer power transferred from the first power conversion stage to the second power conversion stage; and a power injection control block coupled to the energy storage capacitor and to the second power conversion stage and configured to control an amount of power injected into the AC mains by controlling a peak amplitude of a fluctuating sinusoidal component of a DC voltage on the energy storage capacitor. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48)
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Specification