Active Harmonic Filters

Australian-Made Power Quality Solutions for Commercial and Industrial Operations

Quality Energy is Australia's leading manufacturer of Active Harmonic Filters, delivering complete power quality solutions. From initial auditing to ongoing maintenance, our end-to-end approach ensures your electrical infrastructure runs efficiently, safely, and in full compliance with Australian Standards.

Eliminate Harmonic Distortion.

Protect Your Assets.

Is Your Facility Experiencing These Issues?



  • Equipment overheating or premature failure
  • Unexplained circuit breaker tripping
  • Transformer overheating and reduced lifespan
  • Generator failures or performance issues
  • Crest factors and related problems
  • Fires in wiring and distribution systems
  • Power factor penalties on utility bills
  • Production downtime from electrical faults
  • Non-compliance with AS/NZS 61000.3.6


These symptoms point to harmonic voltage distortion in your electrical network. Left unaddressed, harmonics cause equipment damage, energy waste, and operational disruptions.


Quality Energy's Active Harmonic Filters eliminate up to 97% of harmonic distortion, protecting your equipment and reducing energy costs.

Harmonic Mitigation Made Easy

Quality Energy provides comprehensive harmonic management from assessment to ongoing support:

1. Power Quality Auditing & Testing

Our engineers conduct detailed power quality audits to identify harmonic sources, measure Total Harmonic Distortion, and assess the impact on your electrical infrastructure. We test for anomalies including voltage distortion, current harmonics, and resonance conditions.

2. Custom AHF Design

Based on audit findings, we design Active Harmonic Filter systems tailored to your facility's harmonic profile, load characteristics, and future expansion needs.

3. Manufacturing & Integration

All Quality Energy Active Harmonic Filters are manufactured at our Moorabbin, Victoria facility using premium electrical components. Each unit undergoes rigorous Factory Acceptance Testing before delivery.


4. Professional Installation & Commissioning

Our electrical engineers install and commission your AHF system, ensuring optimal performance and integration with your existing electrical infrastructure.



5. Annual Servicing & Support

We provide ongoing maintenance services to ensure your Active Harmonic Filter continues delivering peak performance year after year.

We provide ongoing maintenance services to ensure your Active Harmonic Filter continues delivering peak performance year after year.


Give our team a call on 1800 736 374 to discuss your requirements.


Why Choose Quality Energy Active Harmonic Filters?

Australian-Made Excellence

  • Manufactured in Moorabbin, Victoria
  • Full compliance with AS/NZS 61000.3.6 and IEEE 519
  • ISO 9001:2015 and ISO 14001:2015 certified
  • Three-year manufacturing warranty (conditions apply)

Superior Performance

  • Mitigate up to 20 harmonics simultaneously
  • Filter harmonics up to the 50th order
  • Harmonic attenuation factor better than 97%
  • Real-time harmonic compensation

Beyond Harmonic Filtering


Our Active Harmonic Filters deliver multiple power quality improvements:


Reactive Power Compensation: Precise step-less compensation for both inductive and capacitive loads, with programmable target cos φ from 0.6 inductive to 0.6 capacitive. Eliminates the need for conventional capacitor banks.

Load Balancing:  Available in 3-wire and 4-wire systems, our load balancing improves voltage imbalance across phases and reduces neutral current, increasing installation safety and equipment efficiency.


Flexible, Future-Proof Design

  • Modular three-level topology
  • Wall-mounted or floor-standing options
  • Individual selection of harmonics to be filtered
  • Single cabinet design reduces installation costs
  • Available in IP20, IP30, and IP54 ratings

Take a Look at Some of the Active Harmonic Filters We’ve Installed Across Australia

active harmonic filter installed at ballarat base hospital

AHF Protects Ballarat Hospital's Equipment

Quality Energy installed a 150A Active Harmonic Filter to protect critical healthcare operations in the hospital's new 6-storey central energy plant. Following detailed power quality monitoring and custom design, the system ensures reliable power continuity for essential services including pathology and pharmacy operations.


ahf installed for blackmores australia

400A AHF Keeps Robotics Running at Blackmores

After introducing a high-speed production line manufacturing 40,000+ vitamin tablets per hour, Blackmores required harmonic mitigation to protect sensitive robotic control systems. Quality Energy's 400A Active Harmonic Filter eliminated power quality issues, safeguarding production continuity and preventing equipment damage from harmonic distortion.



active harmonic filters installed at rialto melbourne

Dual AHF's Reduce THDi to 5% at Rialto Melbourne

During a major upgrade replacing chillers that provide 70% of the building's cooling capacity, Quality Energy installed dual Active Harmonic Filters (400A and 100A). The system reduced Total Harmonic Distortion from 35-40% down to below 5% at maximum load, ensuring IEEE 519 compliance and protecting tenant operations.



Read Our Case Studies

Quality Energy Active Harmonic Filters are installed across diverse commercial and industrial applications:


If you have these loads, you may benefit from an Active Harmonic Filter installation:


  • Variable Frequency Drive
  • Induction Furnace
  • Saturable Reactors
  • Electronics Ballasts
  • UPS
  • Thyristoried Power Control Device
  • Switch Mode Power Supply
  • Computers
  • Single Phase Rectifier
  • AC Regulator
  • Cyclo-converter

What our customers say

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  • Testimonial from Rupe Virk, Head of Projects Jalplas

    In early 2020 our site in Thomastown was experiencing power quality issues that was affecting our critical manufacturing equipment. After contacting Quality Energy and having them conduct a Power Quality study, it was determined we required a 200A Active Harmonic Filter to help eliminate our harmonic pollution and protect our entire infostructure. Quality Energy designed, installed and now maintain our Active Harmonic Filter and we have had a clean bill of health since the installation took place.


    Rupe Virk

    Head of Projects Jalplas

    View case study
  • Testimonial from Chris James, Kurv Living

    In June 2020, Kurv Living were faced with several power outages due to the quality of the power entering our manufacturing facility. After completing extensive Power Quality diagnostics, Quality Energy determined that we had high harmonic levels that were causing our critical machinery to shut down. Quality Energy then installed a 200Amp Active Harmonic Filter in September of the same year and we haven’t had any issues since.


    Chris James

    Kurv Living

    View case study

Frequently Asked Questions

  • What is an active harmonic filter?

    An Active Harmonic Filter is an electronic device that continuously monitors your electrical system and eliminates harmonic distortion by injecting corrective currents in real-time. This protects equipment from overheating and failure, ensures compliance with Australian Standards, and reduces energy waste.


  • How quickly can harmonics damage equipment?

    The impact depends on harmonic levels and equipment sensitivity. Some effects like overheating occur gradually, while others like nuisance tripping or equipment malfunction can happen immediately. A power quality audit identifies your risk level.


  • Can Active Harmonic Filters reduce energy costs?

    AHFs reduce heat losses in cables and transformers, lower demand charges, and can eliminate power factor penalties, reducing overall energy costs. Many clients see ROI within 18-36 months. We discuss this further in our post on the economic benefits of AHFs.


  • What's involved in the installation process?

    After the power quality audit and system design, we custom build your active harmonic filter. Following testing, our technicians complete installation and commissioning within 1-2 days, depending on system size. Minimal downtime is required.


  • How are Active Harmonic Filters different from Passive Harmonic Filters?

    Active Harmonic Filters are made from a series of active and programmable devices that continuously monitor the system's harmonics and clean the current sinewave through inverse currents, eliminating the majority of undesired harmonic components. Passive filters cannot sense real-time conditions. Learn more about active vs passive harmonic filters.


  • Can AHFs be added to existing electrical systems?

    Yes. Active Harmonic Filters integrate with existing electrical infrastructure. We design solutions that work with your current setup, whether that's a new installation or retrofit.


  • Can Active Harmonic Filters improve Power Factor?

    Yes. Active Harmonic Filters improve the power factor by reducing the distortion level of the Harmonics, balancing the current in each phase of the electric power system and providing reactive power compensation. 

  • What makes Quality Energy different from imported AHF suppliers?

    Quality Energy manufactures all units in Australia, providing local support, faster delivery, and systems designed for Australian electrical conditions. Our end-to-end service model means one partner from audit to ongoing maintenance.


Take the First Step Toward Better Power Quality

Our engineers will audit your electrical network, identify harmonic sources, and provide recommendations for optimal harmonic mitigation.


Contact our technical team to discuss your power quality challenges and explore solutions. Complete our form below or call our Moorabbin headquarters on 1800 736 374


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