Nexus Active Harmonic Filters

Nexus Power active harmonic filter or the power filter (AHF) is connected in parallel with non-linear loads and uses one set of current transformers (CT) to detect the load current. It calculates each order harmonic current by FFT algorithms in its DSP microchips, and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmonics.

The Nexus Power active harmonic filters provide solution for real-time cancellation of harmonic distortions created by non-linear loads to ensure compliance with IEEE 519, G5/4 and other power quality standards and recommendations. Nexus Power active harmonic filters are a versatile solution, easily tailored to deliver power factor improvement, voltage variation control, flicker mitigation and load balancing functionality.

Nexus Power AHF’s are built on 3-level topology and are designed for industrial and commercial buildings with voltage level up to 690V in both 3W and 4W applications. Nexus Power AHF’s are customized for demanding applications and are available from 480V up to 1000V.

Functions & customer benefits

Key functions

  • Active harmonic filtering
  • Power factor correction
  • Voltage variation control and flicker mitigation
  • Load balancing in three-phase systems

Customer benefits

  • Energy savings
  • Higher productivity
  • Reliable plant operation at reduced maintenance costs
  • Longer lifetime of electrical and process equipment
  • Additional electric capacity in existing electrical network
  • Compliance with IEEE 519, G5/4, IEC 61000 3-2, 3-4 or any other power quality standards and recommendations
  • Quick return on investment


Nexus Power Active harmonic filtering technology can be applied to wide range of industrial and commercial environments where good power quality is essential. Nexus AHF have been used for the processes that use Variable Speed Drives (VSD), LED Lights, fast fluctuating loads such as welding machines, Uninterrupted Power Supply (UPS) systems and DC load, SMPS, single phase loads such as lighting and computers as well as electric arc furnaces and rolling mills.

Applications in commercial buildings

  • Data centers & IT
  • Airports
  • Hospitals and laboratories
  • Residential buildings
  • Hotel buildings
  • Shopping malls
  • Financial institutions
  • Ski resorts
  • Amusement parks

Applications in infrastructure & renewable energy

  • Water and wastewater treatment plants
  • Heating, ventilation and air conditioning systems (HVAC)
  • Wind and solar farms
  • Traction system
  • Metro stations
  • Cranes
  • Lifts & Escalators

Applications in industry

  • Welding processes in automotive industry
  • Printing industry
  • Chemical Industry
  • Steel industry
  • Cement industry
  • Food and beverage industry
  • Oil and gas industry
  • Pulp and paper industry
  • Textile and clothing industry
  • Pharmaceutical industry
  • Microelectronic manufacturers
  • Package sorting facilities
  • Marine vessels
  • Construction industry (projects)

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