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The higher harmonics in a curve of a prime current

If P_d there is less than power of supply network, rectifier influence to supply network can be not taken into account, U₁ practically is not distorted. If P_d is commensurable with power of the supply network S_NW, the higher harmonics of a current will create a voltage drop across supply network reactances witch is proportional to order of the higher harmonic and U₁ will be deformed. In this case it is necessary to apply filters.

The order of the higher harmonics of a prime current is

,

where К =1,2,3…

m - a multiplicity of pulsation of U_d.

If γ=0 L_d =∞ and (i.e. the form of i₁ is graduated),

where I_1(q) - a rms current of q-th harmonic,

I_{1 (1)} - a rms current of 1-st harmonic.

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