Photovoltaic system for feeding three-phase current into a power grid

US9018801B2 · kind B2 · utility

Assignee

• SMA Solar Technology AG · DE

Inventors

• Sven Bremicker · Baumbach, DE
• Frank Greizer · Kaufungen, DE
• Joachim Laschinski · Berlin, DE
• Matthias Victor · Kassel, DE
• Peter Simon · New York, US

Key dates

• Filing date: Aug 8, 2011
• Grant date: Apr 28, 2015
• Expiry date: Dec 6, 2033

Classification

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

Abstract

The invention relates to a photovoltaic system for feeding three-phase current to a power grid that includes several monophase or three-phase photovoltaic inverters that can be connected to the power grid at the output end and are each fitted with a disconnecting device at the output end. The system includes several photovoltaic generators that are connected to the input end of the photovoltaic inverters. A central control and monitoring unit is connected between the photovoltaic inverters and the power grid. The control and monitoring unit has a grid monitoring device at the feeding point to the grid to measure one or more grid parameters. At least one communication link is provided between the individual photovoltaic inverters or the individual disconnecting devices and the connected central control and monitoring unit such that the connecting devices can disconnect the individual photovoltaic inverters from the power grid by means of a control instruction signal of the communication link. The central control and monitoring unit includes a load unbalance recognition component and a load unbalance regulation component, wherein the regulation includes limiting the power variation b…