ZERO-SEQUENCE CURRENT BALANCER WITH A REAL POWER INJECTOR FOR A THREE-PHASE POWER SYSTEM

A zero-sequence current balancer for a controlling zero-sequence current in a three- phase power system includes a cascade multilevel modular inverter (CMMI) coupled to the three-phase power system, wherein the CMMI has a plurality of modules, each module having a module capacitor, and a real power injector circuit provided between the three-phase power system and the CMMI, wherein the real power injector circuit is structured and configured to cause real power to injected into and/or absorbed from the CMMI to regulate a voltage of one or more of the module capacitors.