Sma Solar Technology Ag

Danfoss Power Electronics A/s

Danfoss Solar Inverters A/s

Frerk Haase

Uffe Borup

In large PV power plants, grounding of individual PV modules may lead to problems. The present invention overcomes such problems. The basis for the invention is a PV power plant comprising one or more PV generators, each comprising a PV string and an inverter with a DC input and an AC output. The PV string comprises at least one PV module and is electrically connected to the DC input of the inverter. The inverter comprises means for controlling the DC potential at the DC input depending on the DC potential at the AC output. The AC outputs of the inverters are coupled in parallel. The novel feature of the invention is that the PV power plant further comprises an offset voltage source, which controls the DC potential at the AC outputs. Thereby, the DC potential at the DC input will be indirectly controlled, and it is thus possible to ensure that the potentials with respect to ground at the terminals of the PV modules are all non-negative or all non-positive without grounding the PV modules. Ground loops can be avoided, and there is no need for the use of transformer-based inverters.

Photovoltaic power plant

A photovoltaic power plant () comprising one or more photovoltaic devices (), each device comprising at least two terminals () wherein one or more of the terminals () is connected to a switch () which is in turn connected to a point () held at a voltage relative to ground () and at least one switch () is controlled in response to one or more parameters, and a method of controlling such a power plant ().

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Harrislee, Germany

Frerk Haase