Method for converting direct voltage into three phase alternating voltage

USRE44901E1 · kind E1 · reissue

Assignee

• SMA Solar Technology AG · DE

Inventors

• Holger Becker · Darmstadt, DE
• Guenther Cramer · Kassel, DE
• Sven Bremicker · Baumbach, DE
• Thorsten Dingel · Kassel, DE
• Bernd Engel · Stuttgart, DE
• Wilfried Groote · Vellmar, DE
• Frank Greizer · Kaufungen, DE
• Ralf Joachim Laschinski · Kassel, DE
• Matthias Victor · Kassel, DE
• Torben Westphal · Aurich, DE

Key dates

• Filing date: Aug 18, 2011
• Grant date: May 20, 2014
• Expiry date: Aug 18, 2031

Classification

• Technology area (CPC —): General

Abstract

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 (WR1-WR3), 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 (WR1-WR3), 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.