Today, with the heavy proliferation of non-linear loads, low power factor on a power system is often the result of a high distortion reactive power component and not inductive reactive power. Therefore, one can no longer say that low power
factor is normally caused by electric motors and other inductive loads. And since the best way to improve a poor power factor caused by non-linear loads is to remove the harmonic currents, the traditional means of adding power factor correction
capacitors is, quite often, no longer suitable due to proliferation of non linear loads like drives. In fact, simply adding capacitors may often make the problem worse as they can resonate with the power system inductance.