Solar power plant

US8053930B2 · kind B2 · utility

Assignee

• SMA Solar Technology AG · DE

Inventors

• Guenther Cramer · Kassel, DE
• Bernd Engel · Stuttgart, DE
• Frank Greizer · Kaufungen, DE
• Joachim Laschinski · Berlin, DE

Key dates

• Filing date: Jun 15, 2009
• Grant date: Nov 8, 2011
• Expiry date: Apr 29, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/56
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A solar power plant with a plurality of photovoltaic modules for generating a power to be fed in a multi-phase grid, several photovoltaic strings, which are allocated to different phases, being connected to a primary side of a mains transformer and at least one inverter for converting the direct voltage generated by the photovoltaic modules into an alternating mains voltage conforming to the grid being provided and said mains transformer being provided with a neutral conductor and with a grounded terminal, is intended to be improved in such a manner that the life of the photovoltaic modules, in particular in case of thin-film modules, is increased, allowing for high conversion efficiency of the inverters at low wiring costs. This is achieved in that an additional direct voltage source is inserted between the neutral conductor and ground in such a manner that the potential of the photovoltaic strings is displaced and that a bias voltage is set, which is different from zero volt.