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AssigneeSMA Solar Technology AG
InventorsMichael Viotto, Markus Hopf, Bernhard Schropp
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The disclosure relates to a method for determining a characteristic curve for a photovoltaic (PV) string of a photovoltaic system having an inverter which is connected to the photovoltaic string and to a power supply network. The photovoltaic string includes a series connection of a plurality of photovoltaic modules, in which series connection at least one of the photovoltaic modules is integrated into the series connection of the photovoltaic modules via a DC/DC converter. The at least one DC/DC converter operates the photovoltaic module assigned thereto in a first operating mode M1 at a maximum power point by varying, over time, a conversion ratio of output voltage (UOut) to input voltage (UIn), and operates the photovoltaic module in a second operating mode M2 with a conversion ratio of output voltage (UOut) to input voltage (UIn) that is constant over time. The method includes operating the at least one DC/DC converter in the second operating mode M2 in response to a current signature for the current (IStr) through the photovoltaic string, determining the characteristic curve by varying the current IStr or the voltage UStr of the photovoltaic string by the inverter, and detecting values assigned to one another for current IStr and voltage UStr of the photovoltaic string in the second operating mode M2 of the DC/DC converter.
A method for determining a characteristic curve for a photovoltaic (PV) string of a PV system having an inverter, which on an input side thereof is connected to the PV string and on an output side thereof is connected to a power supply network,
The method according to claim, 1 wherein the current signature contains an individual identifier of individual DC/DC converters of the PV string, wherein only the individual DC/DC converters are set to operate in the second operating mode M2, and the remaining DC/DC converters of the PV string are set to operate in a third operating mode M3 that suppresses a power draw of the assigned PV module, or wherein only the individual DC/DC converters are set to operate in the third operating mode M3 that suppresses a power draw of the assigned PV module, and the remaining DC/DC converters of the PV string are set to operate in the second operating mode M2.
A DC/DC converter having an input for connecting a PV module and an output for connecting the DC/DC converter to further PV modules of the series string of PV modules, wherein the DC/DC converter is configured to:
A photovoltaic (PV) system comprising:
Dependencies are inferred from the claim text.