PHOTOVOLTAIC POWER CONDITIONING UNITS
First Claim
1. A photovoltaic (PV) system comprising:
- a PV module including a plurality of sub-strings of series connected solar cells arranged in loops; and
a plurality of conversion stages, each conversion stage coupled to one of the plurality of sub-strings and including a DC output, one or more bypass diodes and a sub-string level Maximum Power Point Tracking (MPPT) circuit.
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Accused Products
Abstract
We describe a photovoltaic (PV) panel system comprising a PV panel with multiple sub-strings of connected solar cells in combination with a power conditioning unit (microinverter). The power conditioning unit comprises a set of input power converters, one connected to each sub-string, and a common output power conversion stage, to provide power to an ac mains power supply output. Integration of the micro-inverter into the solar PV module in this way provides many advantages, including greater efficiency and reliability. Additionally, embodiments of the invention avoid the need for bypass diodes, a component with a high failure rate in PV panels, providing lower power loss and higher reliability.
12 Citations
20 Claims
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1. A photovoltaic (PV) system comprising:
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a PV module including a plurality of sub-strings of series connected solar cells arranged in loops; and a plurality of conversion stages, each conversion stage coupled to one of the plurality of sub-strings and including a DC output, one or more bypass diodes and a sub-string level Maximum Power Point Tracking (MPPT) circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A photovoltaic (PV) system for delivering power to an AC grid, the PV system comprising:
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a PV panel comprising a plurality of sub-strings of series connected solar cells, each sub-string of the plurality of sub-strings having an electrical connection at either end; a set of input power converters, one coupled to each sub-string of the plurality of sub-strings and wherein each input power converter includes one or more bypass diodes and a Maximum Power Point Tracking (MPPT) circuit; and a common output power conversion stage coupled to the set of input power converters and configured to provide power to the AC grid. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of providing power to an AC grid from a photovoltaic (PV) panel, the PV panel comprising a plurality of sub-strings of series connected solar cells, the method comprising:
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receiving, with a conversion stage, power from each sub-string of the plurality of sub-strings, wherein the conversion stage includes one or more bypass diodes and a sub-string level Maximum Power Point Tracking (MPPT) circuit; combining power from a plurality of conversion stages and conducting the combined power on a common DC bus; and converting, using a DC to AC converter, the combined power on the common DC bus to AC power for delivery to the AC grid. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification