Patent ID: 8378608

Claim:
A method comprising: via a predetermined information device, for a predetermined excavating machine comprising a plurality of Active Front Ends, each Active Front End electrically coupled to an AC power supply network of said predetermined excavating machine, each Active Front End adapted to provide a required DC bus power to a DC bus, said DC bus electrically coupled to a plurality of inverters, each inverter adapted to supply AC power to at least one operating motor: identifying at least one deselected Active Front End in the plurality of Active Front Ends; identifying at least one selected Active Front End in the plurality of Active Front Ends; determining a required active power of said AC power supply network; determining a required power factor for said AC power supply network; and based on said required active power of said AC power supply network, independently controlling a reactive power produced by each of said at least one selected Active Front End to maintain said required power factor for said AC power supply network.