Active Harmonic Filter System (AHF) - Background

Active Harmonic Filters (AHF) use IGBT fired circuits to mitigate harmonic distortions in the load or the network of loads where they are installed. They can be separately installed on prominent individual loads generating harmonics or combined AHF unit on mains. The combination of both can also be used. It all depends on level of harmonics, type of operational issue for which it is being installed or level of compliance to standards as per utility / distribution company

AHF eliminate harmonic injected into the mains supply by non-linear loads. Its response time is extremely fast and is connected in parallel to the load which is to be compensated.

AHF are connected in parallel to the loads to be compensated. They are designed to be used with the non-linear loads, generating harmonic currents in the network. They can be used both with individual loads or main incoming feeder for central compensation of harmonic currents.

Active Harmonic Filters provides very fast response time to compensate harmonic currents. Fast response to load changes together with excellent output accuracy gives the Active Filters an outstanding harmonic filtration performance and dynamic reactive power response to load changes.

Current harmonic elimination is achieved by sensing load current & extracting harmonic current signal. This and the reactive current signal together are used to generate a reference for the controlled current source connected at the PCC (point of common connection) of source and load. This results in Mains supplying only real power for the load and reactive & harmonics being sourced from the AHF. This is carried out dynamically, so that any change in the load pattern or its nature is immediately responded without any manual intervention.

Contact our Sales Office for further details and specifications

Operating Principle

Applications & Advantages:

  • To reduce harmonics and improve power factor of UPS, rectifiers, AC & DC drives etc. in industrial and commercial installations.
  • Performance meets IEEE and compliance to other international standards.
  • Can be used at the output of UPS, to reduce harmonic effects on UPS and increase available capacity. UPS will supply only fundamental and active power.
  • Can be used as Hybrid filter combination of Activcomp with Active Filter resulting in reduction of cost and rating of active filter.
  • Industries with Harmonic generating loads, Hospitals, Data Centers and IT facilities, Office Buildings, Airports, Shopping Plazas etc

Industrial Application:

  • Automotive Industry
  • Metal & Steel Industry
  • Cement industries
  • Arc Welding
  • Water and waste water treatment plant
  • Lifts, port cranes
  • Oil and gas industry
  • Ventilation
  • Pulp and Paper industry
  • Plastic moulding industries
  • Wind farms and solar power plant
  • Crushers and shredders

Commercial Application:

  • Data Centers and IT-facilities
  • Offices and high rise buildings
  • Traction and Metro stations
  • Airports
  • Fluorescent or HID lighting
  • Hospitals
  • Educational Institution
  • Shopping plazas

Features of AHF:

  • 32 bit, DSP control
  • Load Balancing
  • Employees high speed IGBTs in power circuit
  • Closed loop active filter with source current sensing
  • High attenuation up to 96% of individual harmonics
  • Programmable selective harmonic elimination
  • Selection between PF and harmonic compensation
  • Remote monitoring and diagnosis
  • Self current limiting, under overloading condition
  • Alarm log with date and time stamp for fault diagnosis.
  • Fast and accurate performance
  • Compact size

Customer Benefits:

  • Improves reliability of the electrical system, reduces cable and transformer losses.
  • Better utilization of distribution transformer & generator
  • Increases efficiency, capacitor life, PF, uptime.
  • Quick return on investment
  • One solution for harmonics and Power factor correction
  • Easy to commission and use
  • Allows remote access

Hybrid Power Conditioning System – Combination of Active Harmonic Filtration + Real Time Power Factor Correction System

Hybrid Power conditioning system is a combination of Dynamic Activcomp Thyristor based Power Factor Correction System and IGBT fired Active Harmonic Filtration System offers most viable and economical solution for both Power Factor Compensation and Harmonic Mitigation. The designs offered by us are installed for compensation and Harmonic compliance of main transformer or at major load feeders. Though there are standard ratings but any design can be offered as per customer load characteristics and level of harmonic distortion.

Rating (Dynamic Reactive Compensation + Active Filter)
  • 300 KVAR + 60A
  • 400 KVAR + 100A
  • 500 KVAR + 150A
  • 600 KVAR + 200A
  • 800 KVAR + 300A
  • Any other rating on request

Specification of Active Harmonic Filter

  • Active Harmonic Filter 150A are available with option of Neutral compensation.
  • 200 mm free space below and above required for air ventilation. Floor mounting with air ventilation rack.

Connection Scheme

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