Hi Jaynendra,
I understand you’re seeing the same active power but different reactive power readings when comparing the 3-phase measurement block to the sum of three single-phase blocks.
This difference is because reactive power in a 3-phase system isn’t always just the simple sum of each phase’s value. Unlike active power, reactive power depends on the phase angle between the voltages and currents across all three phases. The 3-phase block measures reactive power by considering the overall interaction between the phases, essentially performing a vector sum, while the single-phase blocks just add up each phase separately, missing these interactions.
For this reason, the 3-phase measurement block provides a more accurate calculation of total reactive power in a 3-phase system, as it properly accounts for the phase relationships.
You can also refer to the following MATLAB documentation for the "3-Phase Instantaneous Power Measurement" block:
Hope this helps.
