Displacement and Distortion Factor

Did you make mistake while writing?

"As per my knowledge by improving distortion factor we can improve displacement factor"

NO. Capacitor improves displacement factor. L & C could improve distortion factor- but dimensions could become huge and unwieldy. Hence there are active filters used which use power electronics with PWM switching - to improve distortion factor - as well as displacement factor.

You have not specified power levels at which you wish to implement - is it in few tens of watts, or hundreds of watts or in kilowatts. Concept remaining the same as I have stated, solutions may vary in implementation.

Pl download data sheets of ST 6561 and understand. Then you will find many more such ICs which will do this job. So end application is important - for computers or TVs or even for still high power equipments?

The poster is correct, when using LC passive filters to mitigate harmonics, the filter's power factor is leading at the fundamental frequency. This improves a plant lagging power factor and can even make it leading if the filter is large enough.

Active harmonics filters don't have this problem as they can correct for harmonics independently from power factor. But they cost more...

Thanks! I am down loading data sheets of ST 6561 to understnad further about this .

I have asked this question for higher rating UPS system, which produces lot of harmons and poor PF .

Pl be specific about ratings, wattages, voltages etc.

Decades back when harmonic and distortions issues became serious - especially in the context of batttery cahrging for telecom & naval batteris of huge capacities - concerened battery charging companies did develop mOSFEt / IGBT based active power factor correction sytems- though expensive. It bacame a necessity. Companies did develop even kilowatt rated distortion corrrection systems (even 2 wire type to absorb dsitortion generated by old system- I have seen German coampanies supplying these). This is a huge field. Your specification is limited. You can have different solution depending on affodability and application.

Thanks