Active v/s Passive Harmonic Filter for VFD | PPT
                     Active v/s 
Passive 
Harmonic Filter 
for VFD
Description
Now that we have already confused by the acronym 
VFD, let us simplify everything about harmonic 
filters in this blog.
Harmonic filters are used to eliminate harmonic 
distortion, which is a result of excessive current in 
and out of appliances. Harmonic filters can prevent 
large quantities of harmonics from causing extreme 
damage to the equipment. It reduces downtime of 
operation and keeps the operating cost under 
control. They are of two types, viz., Active and 
Passive.
Active v/s Passive
Well, most of the things in the world are more 
attractive when they are in active form. For 
instance, I was asked to write this article in active 
form too. But that’s not the case with harmonic 
filters. It’s not a straightforward answer in this 
case.
Active Harmonic Filters are used to eliminate or 
reduce harmonics experienced from power 
received from the national grid. The energy which 
is received in the form of electricity is not 
necessarily clean – the word clean is used in a 
different context than general- and needs to be 
regulated so that it does not cause any harm to 
installation. 
Active v/s 
TherePforae, sactsivei hvarmeonic filters are installed in the 
premises to reduce or minimize the harmonics, 
which indirectly leads to optimization of the power 
supply.
Passive harmonic filters for vfd (variable 
frequency drive) work almost the same as active 
harmonic filters. But the significant difference is that 
it is used for small premises as compared to active 
harmonic filters. It filters the current wave through 
an input reactor, output reactor, shunt reactor, and 
capacitor.
Concluding Note:
If you are facing difficulty in 
choosing between active or 
passive harmonic filters, then 
worry not because it’s a common 
doubt, and everyone faces this 
problem. You just need the right 
guidance to sail you through this 
ocean of doubts. Energy Control 
System might help you.
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