Active harmonic filters (AHFs/APF) are typically stand-alone
devices that reduce the high levels of harmonics produced by energy
efficient non-linear loads.They work by injecting harmonics into
the electrical system in equal and opposite measure to the existing
system harmonics.As previously mentioned, harmonic filters are used
to eliminate harmonic distortion caused by excess currents in and
out of appliances. It can prevent large quantities of harmonics
from causing damage to equipment, downtime of operation, and
preventing an increase in operating costs.The Active power filter
monitors the load current real-time through the external current
transformer CT, and extracts the harmonic component of the load
current through the internal DSP computing, then sends it through
the PWM signal to the internal IGBT, the inverter produces a
current equal to the load harmonic and opposite to the harmonic
direction and injects the current into the grid to compensate the
harmonic current realizing the function of harmonic control.System
parameters Rated input wire voltage 3 8 0 V(-1 5%~+2 0%) Grid
frequency 5 0 / 6 0 H z ( r a n g e : 4 5 H z~6 2 H z) Number of
parallel machines 1 ~ 1 0 s e t s Overall efficiency ≥9 7% Grid
structure T h r e e - p h a s e t h r e e - w i r e / t h r e e - p
h a s e f o u r - w i r e Current transformer 1 5 0/5~1 0 0 0 0/5
Circuit topology T r i - l e v e l P e r f o r m a n c
e i n d e x Response time
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