Grounding scheme for modular embedded multilevel converter

A system for power conversion, comprising:

• a power source;
• a load;
• a first power converter, comprising:
• at least two legs, wherein each of the at least legs comprises:
• a first string comprising a plurality of controllable semiconductor switches, a first connecting node, and a second connecting node, wherein the first string is operatively coupled across a first bus and a second bus;
• a second string operatively coupled to the first string via the first connecting node and the second connecting node, wherein the second string comprises a plurality of switching units;
• wherein the first string comprises a first branch and a second branch, and wherein the second branch is operatively coupled to the first branch via a third connecting node;
• wherein the third connecting node is coupled to a ground connection;
• wherein the third connecting nodes of the at least two legs are directly connected to each other;
• and
• a controller configured to control switching of the plurality of controllable semiconductor switches and the plurality of switching units.