Amtech
@amtech758
Operating Principle of Active Harmonic Filter (AHF)
High harmonics escalate complications which affect all power distribution networks in industrial, commercial, telecom and medical applications.
Most of the power converting equipments or facilities can generate harmonic current. Amtech Electronic Active Harmonic Filter Axpert-i-sine, the Multi-Functional Active Harmonic Filter, designed with intelligent control algorithm, dynamically changes the switching frequency to optimize the performance and efficiency of these equipments. The performance of Amtech Electronic Active Harmonic Filter Axpert-i-sine is less affected by supply voltage harmonic distortion and it provides selective harmonic attenuation up to 51st order.
Amtech Electronic Active Harmonic Filter AXPERT-i-sine provides 3-Phase harmonic current compensation. The active filter is inserted between the load and the source, in parallel to the load. For a six-phase rectifier load, the load current IL appears in a form of rectangular waves. This can be considered a result of synthesis of the fundamental current IF and the harmonic current IH. So, (IL = IF +IH)
The compensation current IC of the active filter is controlled, so that its intensity is the same as that of the above-mentioned IH and its polarity is just reversed (IC = -IH). As a result, components of harmonic currents in the load current are cancelled by the effect of active filter and source current IS remains only
to IF, which is a sinusoidal wave.
This can be clearly explained by the below expression:
IL = IF + IH,
IC = -IH
So... IS = IL + IC = (IF +IH) + (-IH) = IF
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