Method for activating a multi-string inverter for photovoltaic plants
First Claim
1. A method of activating a Multi-String inverter for photovoltaic generators (1a, 1b) of a photovoltaic plant (6),said Multi-String inverter incorporating one separate DC-DC converter (2a, 2b) for each generator string (photovoltaic generator) (1a, 1b) on its input sideeach output of said DC-DC converters (2a, 2b) being connected in parallel and with an input of a DC-AC converter (3)and said DC-AC converter (3) being connected to an alternating current mains (4) for feeding into the mains,characterized in that one or several electrical variables, namely input current, input voltage and/or input power are measured at each DC-DC converter (2a, 2b)and that, when a limit value and/or a window is exceeded, as a function of this measurement, at least one of said DC-DC converters (2a, 2b) changes its operating condition in such a manner that its power loss is reduced,so that the energy yield of the photovoltaic plant (6) is increased.
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Abstract
A method of activating a Multi-String inverter for photovoltaic generators (1a, 1b) of a photovoltaic plant (6), the Multi-String inverter incorporating on the input side a separate DC-DC converter (2a, 2b) for each generator string (photovoltaic generator) (1a, 1b) and each output of the DC-DC converters (2a, 2b) being connected in parallel and to an input of a DC-AC converter (3) and the DC-AC converter (3) being connected with an alternating current mains (4) for feeding into the mains aims at improving efficiency. This is achieved in that one or several electrical variables, namely input current, input voltage and/or input power are measured at each DC-DC converter (2a, 2b) and at least one of the DC-DC converters (2a, 2b) changing its operating condition as a is function of this measurement when a limit value and/or a range is exceeded in such a manner that its power loss is reduced so that the energy yield of the photovoltaic plant (6) is increased.
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Citations
11 Claims
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1. A method of activating a Multi-String inverter for photovoltaic generators (1a, 1b) of a photovoltaic plant (6),
said Multi-String inverter incorporating one separate DC-DC converter (2a, 2b) for each generator string (photovoltaic generator) (1a, 1b) on its input side each output of said DC-DC converters (2a, 2b) being connected in parallel and with an input of a DC-AC converter (3) and said DC-AC converter (3) being connected to an alternating current mains (4) for feeding into the mains, characterized in that one or several electrical variables, namely input current, input voltage and/or input power are measured at each DC-DC converter (2a, 2b) and that, when a limit value and/or a window is exceeded, as a function of this measurement, at least one of said DC-DC converters (2a, 2b) changes its operating condition in such a manner that its power loss is reduced, so that the energy yield of the photovoltaic plant (6) is increased.
Specification