THDi calculation

[mathieucarbou]

THDi can be calculated based on the power factor and phase angle (deplacement factor).

Since we know in the dimmer library the time when the dimmer is activated, is there a way to derive the angle to get the cosPhi ?

      // https://fr.electrical-installation.org/frwiki/Indicateur_de_distorsion_harmonique_:_facteur_de_puissance
      const float phi = 0; // TODO: find angle
      const float pf = getTotalPowerFactor();
      return sqrt(pow(cos(phi), 2) / pow(pf, 2) - 1);

[mathieucarbou]

Actually, thinking about it... This is a resistive load so as looking at the oscilloscope graphs (https://yasolr.carbou.me/overview), there is no phase shift between U and I so phi should be 0 and cos phi 1.