System and method for determining harmonic contributions from non-linear loads without disconnecting any load

A system for determining harmonics caused by non-linear loads, comprising:

• means for receiving metered voltage from an electric power system;
• means for receiving metered current from the electric power system;
• means for determining a predicted voltage based upon the metered current;
• means for comparing the predicted voltage with the metered voltage;
• and
• means for determining a harmonic voltage component using a plurality of weights determined when the predicted voltage converges with the metered voltage.

A program for determining harmonics caused by non-linear loads stored on computer-readable medium, the program comprising:

• logic configured to receive information corresponding to a metered current from an electric power system;
• logic configured to receive information corresponding to a metered voltage on the electric power system;
• logic configured to determine a predicted voltage based upon the metered current;
• and
• logic configured to determining a harmonic voltage component using a plurality of weights determined when the predicted voltage converges with the metered voltage.