Method and inverter for distributing power among a plurality of DC sources connected jointly to a DC voltage input of a DC-to-AC converter

US10056758B2 · kind B2 · utility

Assignee

• SMA Solar Technology AG · DE

Inventors

• Alexander Unru · Kirchbauna, DE
• Thomas Schroeder · Oettingen, DE

Key dates

• Filing date: Jul 29, 2015
• Grant date: Aug 21, 2018
• Expiry date: Oct 17, 2036

Classification

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

Abstract

In order to distribute power over multiple direct current sources which are connected in parallel to an input-side direct voltage intermediate circuit of a DC/AC transformer, at least one of which direct current sources is connected to the direct voltage intermediate circuit via a DC/DC transformer, wherein the DC/DC transformer can be actuated to change the power fed into the direct voltage intermediate circuit by the direct current source, the power levels of the direct current sources are decreased differently in a decreased operating mode of the DC/AC transformer in which the power of the DC/AC transformer is decreased compared to the sum of the maximum power levels available from all the direct current sources, and by actuating at least the one DC/DC transformer via which the at least one direct current source is connected to the direct voltage intermediate circuit, variation in the power levels of at least one other direct current source is compensated dynamically.