2.3.2 Per-Phase Per-Sample Power Offset Approach

The per-phase power offset compensation values affect both pulsed outputs and integration register values and are named:

• POWER_OFFSET_P_A, POWER_OFFSET_P_B, POWER_OFFSET_P_C
• POWER_OFFSET_Q_A, POWER_OFFSET_Q_B, POWER_OFFSET_Q_C

POWER_OFFSET_P_x is the per-phase active energy offset value in units of [W-samples scaled] with the same scaling as the 64-bit active energy accumulator P_x.

POWER_OFFSET_Q_x is the per-phase reactive quadergy offset value in units of [VAR-samples scaled] with the same scaling as the 64-bit reactive quadergy accumulator Q_x.

Computation of the per-phase POWER_OFFSET_P_x values can be as simple as applying all active voltage phases and zeroing current phases. After integrating over an acceptable period of time, each 64-bit P_x accumulator is, then, divided by the number of samples in the integration period and applied to the POWER_OFFSET_P_x register. If voltage magnitude effects are desired, the application processor may scale POWER_OFFSET_P_x as desired and updated.

A similar approach is used for computation of the POWER_OFFSET_Q_x values.