Energy supply system for feeding a dc link, and method for operating the system

A system for feeding a DC link, comprising:

• a sensor adapted to detect a current in the DC link and/or a voltage on the DC link connected to a controller adapted to activate a second converter;
• a first energy storage device connected via the second converter to the DC link;
• wherein the controller is adapted to activate a third converter;
• wherein a second energy storage device is connected via the third converter to the DC link;
• and
• wherein the first and second energy storage devices are different.

A method for operating a system, comprising:

• (a) detecting chronologically repeating values of a physical variable;
• (b) performing a Fourier transformation on a curve of the values detected in a first time span and on a curve of the values detected in a second time span;
• (c) determining at least one maximum of the Fourier-transformed curve of the values detected in the first time span;
• (d) determining a first compensation signal directed to frequency;
• (e) supplying the first compensation signal to a DC link;
• (f) determining at least one maximum of the Fourier-transformed curve of the values detected in the second time span;
• (g) determining a second compensation signal directed to frequency;
• and
• (h) supplying the second compensation signal to the DC link.

A system for feeding a DC link, comprising:

• a sensor adapted to detect a current in the DC link and/or a voltage on the DC link connected to a controller adapted to activate a second converter;
• a first energy storage device connected via the second converter to the DC link;
• wherein the controller is adapted to activate a third converter;
• wherein a second energy storage device is connected via the third converter to the DC link;
• and
• wherein the first and second energy storage devices are different;
• and
• wherein system is adapted to perform a method for operating the system, including:
• (a) detecting chronologically repeating values of a physical variable;
• (b) performing a Fourier transformation on a curve of the values detected in a first time span and on a curve of the values detected in a second time span;
• (c) determining at least one maximum of the Fourier-transformed curve of the values detected in the first time span;
• (d) determining a first compensation signal directed to frequency;
• (e) supplying the first compensation signal to the DC link;
• (f) determining at least one maximum of the Fourier-transformed curve of the values detected in the second time span;
• (g) determining a second compensation signal directed to frequency;
• and
• (h) supplying the second compensation signal to the DC link.

A method for operating a system for feeding a DC link, the system including a sensor adapted to detect a current in the DC link and/or a voltage on the DC link connected to a controller adapted to activate a second converter, and a first energy storage device connected via the second converter to the DC link, the controller being adapted to activate a third converter, a second energy storage device being connected via the third converter to the DC link, the first and second energy storage devices being different, comprising:

• (a) detecting chronologically repeating values of a physical variable;
• (b) performing a Fourier transformation on a curve of the values detected in a first time span and on a curve of the values detected in a second time span;
• (c) determining at least one maximum of the Fourier-transformed curve of the values detected in the first time span;
• (d) determining a first compensation signal directed to frequency;
• (e) supplying the first compensation signal to the DC link;
• (f) determining at least one maximum of the Fourier-transformed curve of the values detected in the second time span;
• (g) determining a second compensation signal directed to frequency;
• and
• (h) supplying the second compensation signal to the DC link.