On the changes in the fundamental component caused by the higher harmonic components in an oscillator with resistive nonlinearity

In an oscillator with nearly sinusoidal voltage, the change ΔI1, of the fundamental component of current owing to the presence of higher harmonic voltage components Vn, can be expressed as a function of Vn. It is shown that the relation for Im ΔI1corresponds to Groszkowski´s law of reactive power balance of harmonics. An interesting relation between Re ΔI1and the sum of real powers of the higher harmonics is found.