# Concept of Harmonics !

#### Abdul Wali

Joined Mar 19, 2016
35
can we say that harmonics are because of Reactive Power (i know that one way of controlling harmonics is filtering) ? IF YES, can we control Reactive power by increasing Power Factor ? IF YES it means Harmonics can be controlled by increasing Power Factor ? Does Harmonics occurs by supplying a pure DC current to non linear load ?

#### SLK001

Joined Nov 29, 2011
1,548
I would say "NO" to all of your questions.

#### alfacliff

Joined Dec 13, 2013
2,458
harmonics are the result of distortion. not reflected waves due to impedance missmatch.
there are no harmonics in a pure dc circuit.

#### mcasale

Joined Jul 18, 2011
210
If you have any type of periodic waveform, say at a frequency of F, then it can be expressed as a sum of sines and cosines, of different amplitudes of harmonics of F. It also may include a DC component. This is called a Fourier series of that arbitrary waveform.

It is also true that if you distort a pure sine wave - say by clipping it, it will contain harmonics of that sine wave.

A periodic square wave has lots of harmonics.