Sma Solar Technology Ag

Adrian Haering

Sven Bremicker

Frank Greizer

Joachim Ralf Laschinski

Henrik Wolf

Matthias Victor

Gerd Bettenwort

Bernd Engel

Torben Westphal

Andreas Jeppe

Matthias Walter

In order to protect reverse currents, several strings of a photovoltaic generator, which are connected in small groups respectively via a DC/DC-converter, parallel to a common DC voltage intermediate circuit, the current which flows over each of the DC/DC-converter is detected and if a reverse current is detected flowing through one of the DC/DC converters, the converter is stopped by controlling the DC/DC-converter.

Method and device for protecting several strings of a photovoltaic generator from reverse currents

A protection system configured to couple between a generator that has a number of partial strings and an inverter includes a control device, and a series-connection switching device configured to selectively connect the partial strings together in series. The system also includes a parallel-connection switching device configured to selectively connect the partial strings together in parallel, wherein the series-connection switching device is actuated by the control device such that it interrupts the series connection of the partial strings in case of a hazard, and the parallel-connection switching device is actuated by the control device such that it connects the partial strings together in parallel in case of a hazard.

Method for limiting the generator voltage of a photovoltaic installation in case of danger and photovoltaic installation

In an overvoltage protection apparatus before an inverter configured to feed electric energy from a DC voltage source into an AC power grid, the overvoltage protection apparatus includes a DC voltage input stage. The DC voltage input stage includes at least two current-carrying lines and an EMC filter including interference suppressing capacitors and interference suppressing inductors, and surge arrestors configured to divert overvoltages with respect to ground are connected to the current-carrying lines after the EMC filter, from a point of view of the DC voltage source.

Overvoltage protection for inverters that comprise an EMC filter at their input end

Growing community of inventors

Niestetal, Germany

Adrian Haering