Why is the harmonic current on the null line mainly three times?
This is due to two reasons:
(1) Among the harmonic components generated by single-phase rectifier circuit, the third harmonic is the largest, and the distortion rate of the third harmonic usually reaches more than 80%.
(2) The harmonic current of other times will have the effect of canceling on the zero line, only three times will not.
The single-phase rectifier circuit generates the third harmonic current. The phase difference of the third harmonic current is 360 ° (3 × 120 °=360 °), for alternating current, the phase difference of 360 ° means that they are in phase. Therefore, the 3rd harmonic current is arithmetically superimposed on the zero line. This is the particularity of the third harmonic.
Not only the third harmonic has such characteristics, but also the harmonic with a frequency of 3 times the fundamental frequency should have such characteristics. These harmonics whose frequency is three times of the fundamental frequency are called third harmonic, and they are all arithmetically superimposed on the neutral line. However, the 6th, 9th and higher 3rd harmonic waves are very small or even absent, so they are not considered.
YTPQC Active Harmonic Filter has a advanced modular design. Usually YTPQC-AHF consists of one or several AHF modules and an optional touched LCD Human Machine Interface. Each AHF module is an independent harmonic filtering system, and users can change the harmonic filtering system rating by adding or removing AHF modules.
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