Non-sinusoidal power theory in a power system having transmission lines with frequency-dependent resistances

Recently power systems suffer from harmonic pollution, and the resistances of transmission lines are frequency-dependent due to eddy currents and the skin effect. This frequency dependency should be taken into account, so that apparent power and the power factor accurately reflect transmission loss under non-sinusoidal conditions. A generalised power theory that is applicable to a power system whose transmission/distribution lines have frequency-dependent resistances, and where a unity power factor is given as the minimum loss condition is proposed