Solar photovoltaic system with maximized ripple voltage on storage capacitor
First Claim
1. A method for generating a three phase ac mains power supply from a plurality of photovoltaic panels, the method comprising:
- connecting dc power outputs from the plurality of photovoltaic panels in parallel to an input of a power conditioning unit; and
converting an input flow of dc power from the dc power outputs into the three phase ac mains power supply using the power conditioning unit, wherein the converting comprises converting the input flow of dc power into an intermediate flow of dc power on a dc link of the power conditioning unit coupled to an energy storage capacitor having a ripple voltage that is proportional to the intermediate flow of dc power on the dc link, and converting the intermediate flow of dc power to the three phase ac mains power supply with a dc to ac converter that is controlled to maximize the ripple voltage on the energy storage capacitor.
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Abstract
We describe a photovoltaic (PV) power generation system comprising at least two PV panels and a power conditioning unit. The dc power outputs of the PV panels are connected in parallel to a dc power input of the power conditioning unit. The power conditioning unit comprises a dc-to-dc converter having an input coupled to the dc power input and an output coupled to a dc link of the unit, a dc-to-ac converter having an input coupled to the dc link and an ac mains power supply output, and an energy storage capacitor coupled to the dc link. The power conditioning unit is configured to perform maximum power point tracking (MPPT) responsive to a level of power flowing into the dc power input, and the level of power flowing into said dc power input is sensed at the dc link. In preferred implementations the energy storage capacitor is a non-electrolytic capacitor.
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Citations
21 Claims
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1. A method for generating a three phase ac mains power supply from a plurality of photovoltaic panels, the method comprising:
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connecting dc power outputs from the plurality of photovoltaic panels in parallel to an input of a power conditioning unit; and converting an input flow of dc power from the dc power outputs into the three phase ac mains power supply using the power conditioning unit, wherein the converting comprises converting the input flow of dc power into an intermediate flow of dc power on a dc link of the power conditioning unit coupled to an energy storage capacitor having a ripple voltage that is proportional to the intermediate flow of dc power on the dc link, and converting the intermediate flow of dc power to the three phase ac mains power supply with a dc to ac converter that is controlled to maximize the ripple voltage on the energy storage capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for generating three phase ac mains power supply from a plurality of photovoltaic panels, the system comprising:
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means for connecting dc power outputs from the photovoltaic panels in parallel to an input of a power conditioning unit to provide a common flow of dc power; means for converting an input flow of dc power from the dc power outputs into the three phase ac mains power supply using the power conditioning unit, wherein the converting comprises converting the input flow of dc power into an intermediate flow of dc power on a dc link of the power conditioning unit coupled to an energy storage capacitor having a ripple voltage that is proportional to the intermediate flow of dc power on the dc link; and means for converting the intermediate flow of dc power to the three phase ac mains power supply with a dc to ac converter that is controlled to maximize the ripple voltage on the energy storage capacitor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A photovoltaic power generation system, the system comprising:
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at least two photovoltaic panels for generating dc power, each having a dc power output; a power conditioning unit having a dc power input and a three phase ac output for delivering power to a three phase ac mains, wherein the dc power outputs of the at least two photovoltaic panels are connected in parallel to the dc power input, the power conditioning unit comprising; a dc-to-dc converter having an input coupled to the dc power input and an output coupled to a dc link, wherein the dc-to-dc converter is configured to convert dc power received from the at least two photovoltaic panels into an intermediate flow of dc power on the dc link; an energy storage capacitor coupled to the dc link and having a ripple voltage that is proportional to the intermediate flow of dc power on the dc link; and a dc-to-ac converter having an input coupled to the dc link and an output coupled to the three phase ac mains, wherein the dc-to-ac converter is configured to convert the intermediate flow of dc power on the dc link to three phase ac power for delivery to the three phase ac mains, and to maximize the ripple voltage on the energy storage capacitor.
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Specification