| 摘要 |
In a photovoltaic system including a plurality of strings, each includes a plurality of photovoltaic modules exclusively connected in series, bus lines to which the strings are connected in parallel, and a converter for feeding electric energy from the bus lines into a power grid. A system voltage drop between the bus lines can be adjusted by a controller of the converter, and a current sensor is provided for each string that at least determines whether a reverse current flows to the string and reports to the controller of the converter whether a reverse current flows to the string, and the controller of the converter reduces the system voltage present between the bus lines to stop the reverse current. |
| 主权项 |
1. A photovoltaic system comprising a plurality of strings which each comprise a plurality of photovoltaic modules exclusively connected in series, bus lines to which the plurality of strings are connected together in parallel, wherein a current sensor is provided for each string and is configured to determine whether a reverse current flows to the respective string, and a converter configured to feed electric energy from the bus lines into a power grid, wherein a system voltage drop between the bus lines can be adjusted by means of a controller of the converter, and wherein each current sensor reports to the controller of the converter whether a reverse current flows to the respective string, and wherein the controller of the converter reduces the system voltage present between the bus lines to stop the reverse current in response thereto, wherein, after the reduction of the system voltage between the bus lines, the other strings not associated with the reverse current flow further supply electric energy that the converter feeds into the power grid as long as the reduced system voltage between the bus lines is sufficient for feeding electric energy into the power grid.
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