Sma Solar Technology Ag

Torben Westphal

Sven Bremicker

Frank Greizer

Matthias Victor

Bernd Engel

Henrik Wolf

Wilfried Groote

Holger Becker

Thorsten Dingel

Ralf Joachim Laschinski

Günther Cramer

Guenther Cramer

Adrian Haering

Andreas Jeppe

Dr-Ing Henrik Wolf

Adrian Häring

A method of converting a direct voltage generated by a decentralized power supply system into three-phase alternating voltage by means of a plurality of single-phase inverters (WR-WR), said alternating voltage being provided for supplying an electric mains, is intended to avoid inadmissible load unbalances using single-phase inverters. This is achieved in that, upon failure of one inverter (WR-WR), an asymmetrical power supply distribution is reduced by limiting the output of the other inverters. The method makes it possible to simplify three-phase voltage monitoring.

Method for converting direct voltage into three phase alternating voltage

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

Method for converting direct voltage into three-phase alternating voltage

Growing community of inventors

Kassel, Germany

Torben Westphal