System, in particular a power supply system, for feeding a DC link, wherein a sensor for detecting a current in the DC link or a voltage at the DC link is connected to a controller that actuates a second converter, in particular a DC-to-DC converter or current regulator, wherein a first energy storage device is connected to the DC link by means of the second converter, wherein the DC link can be supported by the first energy storage device by means of the second converter, wherein the first energy storage device is connected to the first terminal of the second converter, and the second terminal of the second converter is connected to the DC link and the sensor, wherein the controller actuates a third converter, in particular a DC-to-DC converter or current regulator, wherein a second energy storage device is connected to the DC link by means of the third converter, wherein the DC link can be supported by the second energy storage device by means of the third converter, wherein the second energy storage device is connected to the first terminal of the third converter, and the second terminal of the third converter is connected to the DC link and the sensor, characterised in that the controller actuates a fourth converter, in particular a DC-to-DC converter or current regulator, wherein a third energy storage device is connected to the DC link by means of the fourth converter, wherein the DC link can be supported by the third energy storage device by means of the fourth converter, wherein the third energy storage device is connected to the first terminal of the fourth converter, and the second terminal of the fourth converter is connected to the DC link and the sensor, wherein the first, third and second energy storage devices (11, 12, 13) are different in that the first, third and second energy storage devices (11, 12, 13) have different dynamic behaviour and have different discharge time constants, wherein the controller actuates a first converter, in particular a DC-to-DC converter or current regulator, which is fed from a power supply module coupled to the first terminal of the first converter, wherein the second terminal of the first converter is electrically connected to the DC link, in particular is coupled to the DC link, in particular wherein the power supply module has a mains-powered rectifier, wherein, in order to support the energy storage devices (11, 12, 13), the power supply module provides a further DC voltage which provides a charging voltage or a charging current to each energy storage device (11, 12, 13) by means of a respective converter (7, 6, 5), thus preventing complete draining, in particular wherein the further DC voltage is provided by means of a further DC link, wherein the actuation is executed by the controller by means of a respective converter (7, 6, 5). wherein a sensor for detecting a current in the DC link or a voltage at the DC link is connected to a controller that actuates a second converter, in particular a DC-to-DC converter or current regulator, wherein a first energy storage device is connected to the DC link by means of the second converter, wherein the DC link can be supported by the first energy storage device by means of the second converter, wherein the first energy storage device is connected to the first terminal of the second converter, and the second terminal of the second converter is connected to the DC link and the sensor, wherein the controller actuates a third converter, in particular a DC-to-DC converter or current regulator, wherein a second energy storage device is connected to the DC link by means of the third converter, wherein the DC link can be supported by the second energy storage device by means of the third converter, wherein the second energy storage device is connected to the first terminal of the third converter, and the second terminal of the third converter is connected to the DC link and the sensor, characterised in that the controller actuates a fourth converter, in particular a DC-to-DC converter or current regulator, wherein a third energy storage device is connected to the DC link by means of the fourth converter, wherein the DC link can be supported by the third energy storage device by means of the fourth converter, wherein the third energy storage device is connected to the first terminal of the fourth converter, and the second terminal of the fourth converter is connected to the DC link and the sensor, wherein the first, third and second energy storage devices (11, 12, 13) are different in that the first, third and second energy storage devices (11, 12, 13) have different dynamic behaviour and have different discharge time constants, wherein the controller actuates a first converter, in particular a DC-to-DC converter or current regulator, which is fed from a power supply module coupled to the first terminal of the first converter, wherein the second terminal of the first converter is electrically connected to the DC link, in particular is coupled to the DC link, in particular wherein the power supply module has a mains-powered rectifier, wherein, in order to support the energy storage devices (11, 12, 13), the power supply module provides a further DC voltage which provides a charging voltage or a charging current to each energy storage device (11, 12, 13) by means of a respective converter (7, 6, 5), thus preventing complete draining, in particular wherein the further DC voltage is provided by means of a further DC link, wherein the actuation is executed by the controller by means of a respective converter (7, 6, 5).