Power condition units with MPPT
First Claim
1. A power conditioning unit with maximum power point tracking (MPPT), for delivering power from a dc power source to an ac mains power supply output, the power conditioning unit comprising:
- an input for receiving power from said dc power source;
an output for delivering ac power to said ac mains power supply;
an energy storage capacitor for storing energy from said dc power source for delivering to said ac mains power supply output;
a dc-to-ac converter coupled to said output for converting energy stored in said energy storage capacitor to ac power for said ac mains power supply output; and
a power injection control block having a sense input coupled to said energy storage capacitor and having an output coupled to said dc-to-ac converter, to control said dc-to-ac converter to control power injected into said ac mains power supply,wherein, in operation, a voltage on said energy storage capacitor has a sinusoidal voltage component at twice a frequency of said ac mains,wherein said power injection control block is configured for controlling an amplitude of an ac current provided to said ac mains power supply output such that an amount of power transferred to said ac mains power supply output is dependent on an amplitude of said sinusoidal voltage component on said energy storage capacitor, andwherein said power injection control block is configured to track a maximum power point of said dc power source by controlling said dc-to-ac converter.
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Accused Products
Abstract
A power conditioning unit with maximum power point tracking (MPPT) for a dc power source in a photovoltaic panel is provided. The power conditioning unit includes a power injection control block having a sense input coupled to an energy storage capacitor on a dc link for controlling a dc-to-ac converter to control the injected mains power. The power injection control block tracks the maximum power point by measuring a signal on the dc link which depends on the power drawn from the dc power source, and thus there is no need to measure the dc voltage and current from the dc source. The measured signal is a ripple voltage level and the power injection control block controls the amplitude of an ac current output such that the amount of power transferred to the grid mains is dependent on the amplitude of a sinusoidal voltage component on the energy storage capacitor.
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Citations
9 Claims
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1. A power conditioning unit with maximum power point tracking (MPPT), for delivering power from a dc power source to an ac mains power supply output, the power conditioning unit comprising:
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an input for receiving power from said dc power source; an output for delivering ac power to said ac mains power supply; an energy storage capacitor for storing energy from said dc power source for delivering to said ac mains power supply output; a dc-to-ac converter coupled to said output for converting energy stored in said energy storage capacitor to ac power for said ac mains power supply output; and a power injection control block having a sense input coupled to said energy storage capacitor and having an output coupled to said dc-to-ac converter, to control said dc-to-ac converter to control power injected into said ac mains power supply, wherein, in operation, a voltage on said energy storage capacitor has a sinusoidal voltage component at twice a frequency of said ac mains, wherein said power injection control block is configured for controlling an amplitude of an ac current provided to said ac mains power supply output such that an amount of power transferred to said ac mains power supply output is dependent on an amplitude of said sinusoidal voltage component on said energy storage capacitor, and wherein said power injection control block is configured to track a maximum power point of said dc power source by controlling said dc-to-ac converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification