Power conditioning unit
First Claim
1. A photovoltaic power conditioning unit for delivering power from a dc photovoltaic power source to an ac mains power supply, the photovoltaic power conditioning unit comprising:
- an input for receiving power from said dc power source;
an output for delivering ac power;
an non-electrolytic 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;
a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled to said output; and
a power injection control block configured to control an amount of power transferred from said dc-to-ac converter to said ac mains power supply based at least in part on an amplitude of a fluctuating sinusoidal component of a dc voltage on said energy storage capacitor.
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Accused Products
Abstract
A photovoltaic power conditioning unit for delivering power from a dc photovoltaic power source to an ac mains power supply is disclosed. The photovoltaic power conditioning unit may include a non-electrolytic energy storage capacitor, a dc-to-dc converter having an input connection coupled to an input and an output connection coupled to the energy storage capacitor. The photovoltaic power conditioning unit also may include a dc-to-ac converter having an input connection coupled to the energy storage capacitor and an output connection coupled to an output and a power injection control block configured to control an amount of power transferred from the dc-to-ac converter to the ac mains power supply based, at least in part, on an amplitude of a fluctuating sinusoidal component of a dc voltage on the non-electrolytic energy storage capacitor.
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Citations
20 Claims
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1. A photovoltaic power conditioning unit for delivering power from a dc photovoltaic power source to an ac mains power supply, the photovoltaic power conditioning unit comprising:
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an input for receiving power from said dc power source; an output for delivering ac power; an non-electrolytic 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; a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled to said output; and a power injection control block configured to control an amount of power transferred from said dc-to-ac converter to said ac mains power supply based at least in part on an amplitude of a fluctuating sinusoidal component of a dc voltage on said energy storage capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A photovoltaic power conditioning unit comprising:
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a non-electrolytic energy storage capacitor; a dc-to-ac converter having an input connection coupled to said energy storage capacitor and an output connection coupled for delivering ac power to an ac mains power supply; and a power injection control block to control said dc-to-ac converter, wherein said power injection control block is configured to control an amplitude of an ac current provided to said ac mains power supply such that an amount of power transferred to said ac mains power supply is dependent on a peak amplitude of a fluctuating sinusoidal component of a dc voltage on said energy storage capacitor.
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12. A control method for controlling a photovoltaic power conditioning unit for delivering power from a dc photovoltaic power source into an ac electricity supply, the method comprising:
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inputting dc power from a dc power source; voltage conditioning said dc power from said dc power source using a dc-to-dc power conversion stage; injecting power into the said ac electricity supply from a dc-to-ac power conversion stage; coupling power from said dc-to-dc power conversion stage to said dc-to-ac power conversion stage via a dc link; buffering energy from said dc power source to said electricity supply using a non-electrolytic dc link energy storage capacitor connected in parallel between an output of said dc-to-dc converter and an input of said dc-to-ac converter; and controlling said dc-to-ac converter power conversion stage to control an amount of power transferred to said ac electricity supply based, at least in part, on a fluctuating sinusoidal component of the non-electrolytic dc link energy storage capacitor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification