Active and Passive

Harmonic Filtering
Systems

High-quality, specific and cost-effective
solutions for reactive power compensation
and harmonic problems of conventional loads.

Primary Benefits

  • Filtering of harmonics
  • Power factor correction
  • Lowering harmonic resonance problems
  • Voltage regulation improvement
  • Decreasing network losses

Application Areas

  • Transmission and Distribution Systems
  • Metal Industry
  • Mining Industry
  • Textile Industry
  • Commercial Facilities

Passive Filters Features

  • Formed from the combinations of passive elements – capacitors, inductors, resistors
  • Low cost solution for bulky reactive power compensation and harmonic filtering
  • Limited harmonic filtering performance
  • Poor design can arise severe resonance problems
  • Requires detailed system study for proper operation

Passive Filters Types

  • High pass filters are also named as damped filters.
  • Generally used for the filtering of harmonics higher than 13th harmonics.
  • Tuned filters are generally tuned to a specific frequencies like 3rd,5th,7th,11th and 13th to present low impedance to a particular harmonic current.
  • C-type filter is generally used for attenuation of low order harmonics and inter-harmonics created by EAFs and HVDC transmission systems.

Active Power Filter How it works?

Active Power Filter (APF) acts as a harmonic
source, which measures the harmonic content of
the load current and injects the opposive of it on
a real time basis, thus makes the current
waveform a pure sinosoidal on the source side .

Primary Benefits

Application Areas

  • Filtering of current harmonics
  • Damping of voltage harmonics
  • Harmonic resonance suppression
  • Power factor correction
  • Load balancing
  • Distribution Systems
  • Textile Industry
  • Paper Industry
  • Automotive Industry
  • Commercial buildings; Banks, Hospitals, Shopping Centers, Hotels, Data Centers etc.

Active Power Filter Features

  • Superior power conditioning device for the compensation of harmonics and reactive power caused PQ problems
  • VSC based power circuit topology
  • Features
  • Current harmonic compensation
  • Voltage harmonic damping
  • Power system resonance prevention
  • Power factor correction
  • Load balancing

References

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