Modular multilevel converter

-20. (canceled)

A modular multilevel converter, comprising:

• a phase leg comprising a upper arm and a lower arm connected in series, wherein the upper arm comprises a plurality of arms connected in parallel, wherein one of the arms comprises a chain link and an arm inductor connected in series, wherein the chain link comprises a plurality of submodules connected in series, wherein each submodule comprises a half-bridge circuit or a full-bridge circuit;
• and
• a control module connected to the plurality of submodules, wherein the control module is modulated by a phase-shift method that carrier phases of submodules in the arm are interleaving, and carrier phases of arms are interleaving or the control module is modulated by a level-shift method.

A modular multilevel converter, comprising:

• a phase leg comprising a upper arm and a lower arm connected in series, wherein the upper arm comprises a plurality of arms connected in parallel, wherein each of the arms comprises a chain link and an arm inductor connected in series, wherein the chain link comprises a plurality of submodules connected in series, wherein each submodule comprises a half-bridge circuit or a full-bridge circuit, and wherein the arm inductors of each arm connected in parallel are coupling to each other.