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Harmonics In Pfc


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#1 Vivek01

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Posted 14 December 2010 - 11:26 AM

Hi, I am new to this forum...
At one of our site, initial current harmonics are 36% and voltage harmonics are 6%.
We decided to put 7% reactor in series with capacitors.
But we observed that after putting reactor in picture harmonics level in current increase to 86%.
How this can happens?
Please reply as we are facing same problem at some sites?



#2 jOmega

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Posted 15 December 2010 - 10:28 PM

QUOTE (Vivek01 @ Dec 14 2010, 05:26 AM) <{POST_SNAPBACK}>
Hi, I am new to this forum...
At one of our site, initial current harmonics are 36% and voltage harmonics are 6%.
We decided to put 7% reactor in series with capacitors.
But we observed that after putting reactor in picture harmonics level in current increase to 86%.
How this can happens?
Please reply as we are facing same problem at some sites?



Without more data, I suspect that the 7% reactor has created a resonance which resulted in the increased current.

Q. Was a harmonic analysis performed ? Probably not.

Q. What is the power factor ?

Q. How much capacitance on the mains or branches for power factor correction ?


Solution to your problem can be found by performing a proper Harmonic Analysis of

your power system ..





#3 Vivek01

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Posted 21 December 2010 - 05:50 AM

Can you guide me to do harmonic analysis analysis of system?
That will helpful for me as i am beginner in Power Electronics.

Thanks






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