Electrical damping device for a DC voltage bus

An electrical damping device for reducing resonance for devices that are coupled to a direct current (DC) voltage bus, the DC voltage bus comprising a first set of DC ports and a second set of DC ports, the first set of DC ports having a first capacitance in parallel with a positive terminal and a negative terminal of the DC ports, the second set of DC ports having a second capacitance in parallel with the DC ports with a positive terminal and a negative terminal of the DC ports;

• wherein the electrical damping device comprises:
• a positive path comprising a first resistive-inductive (RL) network in parallel with a second RL network, wherein the positive path is coupled between the positive terminals of the DC ports;
• a negative path comprising a third RL network in parallel with a fourth RL network, wherein the negative path is coupled between the negative terminals of the DC ports;
• a first transformer defined by a first inductance of first RL network and a third inductance of the third RL network, wherein the first transformer comprises windings arranged for mutual coupling between the positive path and the negative path;
• and
• a second transformer defined by a second inductance of the second RL network and a fourth inductance of the fourth RL network, wherein the second transformer comprises windings arranged for mutual coupling between the positive path and the negative path;
• wherein first transformer comprises an air-wound transformer or coreless transformer that is configured to attenuate frequencies equal to or greater than approximately 10 KHz.

An electrical damping device for reducing resonance for devices that are coupled to a direct current (DC) voltage bus, the DC voltage bus comprising a first set of DC ports and a second set of DC ports, the first set of DC ports having a first capacitance in parallel with a positive terminal and a negative terminal of the DC ports, the second set of DC ports having a second capacitance in parallel with the DC ports with a positive terminal and a negative terminal of the DC ports;

• wherein the electrical damping device comprises:
• a positive path comprising a first resistive-inductive (RL) network in parallel with a second RL network, wherein the positive path is coupled between the positive terminals of the DC ports;
• a negative path comprising a third RL network in parallel with a fourth RL network, wherein the negative path is coupled between the negative terminals of the DC ports;
• a first transformer defined by a first inductance of first RL network and a third inductance of the third RL network, wherein the first transformer comprises windings arranged for mutual coupling between the positive path and the negative path;
• and
• a second transformer defined by a second inductance of the second RL network and a fourth inductance of the fourth RL network, wherein the second transformer comprises windings arranged for mutual coupling between the positive path and the negative path;
• wherein the first transformer comprises an iron core transformer or powdered iron core transformer that is configured to attenuate frequencies equal to or greater than 100 Hz.