Systems and methods for enhancement of digitally sampled electrical measurements

An intelligent electronic device (IED) for an electric power delivery system, the IED comprising:

• analog front-end hardware configured to receive current and voltage measurements of the electric power delivery system;
• sampling circuitry configured to digitally sample the current and voltage measurements according to a first clock to obtain initial digital samples of the current and voltage measurements;
• a first resampling component configured to perform linear interpolation on the initial digital samples of the current and voltage measurements according to a second clock to obtain resampled digital samples of the current and voltage measurements;
• a second resampling component configured to perform quadratic interpolation on the resampled digital samples of the current and voltage measurements at a tracking frequency to obtain samples corresponding to electric power delivery harmonics for power quality;
• and
• one or more compensation filters configured to compensate for linear interpolation error or quadratic interpolation error, or both.