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    Active Harmonic Filter | Powerside
    A Parallel Active Harmonic Mitigation Device, or Active Harmonic Filter (AHF), is a power electronics-based device connected in parallel with non-linear loads to real-time monitor, inject equal-and-opposite harmonic currents, and effectively cancel harmonic distortion (
    ITHD<5%cap I cap T cap H cap D is less than 5 %
    𝐼𝑇𝐻𝐷<5%
    ). These devices improve power factor, correct voltage imbalances, and prevent resonance, commonly used in industrial, commercial, and, variable frequency drive applications. 
    Key Features and Benefits 
    • Active Compensation: Continuously monitors load current and injects compensating current, which can mitigate specific, multiple, or varying harmonic orders.
    • Parallel Connection: Installed in parallel, which means the load current does not pass through the filter, allowing for easier retrofitting and modular scaling of capacity.
    • Performance: Provides efficient (often ~98% at full load) reduction of harmonics to meet IEEE-519 standards.
    • Versatility: Capable of handling, reactive power compensation, load balancing, and flicker mitigation in addition to, harmonic filtering.
    • System Protection: Prevents, resonance and provides, overload protection. 
    Applications
    Active filters are ideal for, variable frequency drives (VFDs), data centers, hospital equipment,, automation systems, and other, nonlinear loads. They are frequently used for, large-scale industrial applications requiring, power quality solutions. 
    • 100A Active Harmonic Filter - CoEpower
      Dec 28, 2025 — 100A Active Harmonic Filter: The Smart Solution for Power Quality and Harmonic Mitigation * A 100A active harmonic fil...
      CoEpower
    • Active Harmonic Filters vs. 18-Pulse Drives
      Active harmonic filters use intelligent electronics and IGBTs to inject corrective current into the power system to correct for th...
      Hammond Power Solutions Americas
    • Harmonic solutions | Reduction of harmonics - Eaton
      Avoids resonance by selecting “tuned” frequency. Typically requires system knowledge and application study/analysis. Parallel acti...
      Eaton
    Show all
    • 100A Active Harmonic Filter - CoEpower
      Dec 28, 2025 — 100A Active Harmonic Filter: The Smart Solution for Power Quality and Harmonic Mitigation * A 100A active harmonic fil...
      CoEpower
    • Active Harmonic Filters vs. 18-Pulse Drives
      Active harmonic filters use intelligent electronics and IGBTs to inject corrective current into the power system to correct for th...
      Hammond Power Solutions Americas
    • Harmonic solutions | Reduction of harmonics - Eaton
      Avoids resonance by selecting “tuned” frequency. Typically requires system knowledge and application study/analysis. Parallel acti...
      Eaton
    • Harmonic distortion and how to combat it
      Mar 2, 2025 — and this current can be nearly sinosoidal active front end drives are sometimes called low harmonic drives. and this is...
      YouTube·Danfoss Drives
      5m
    • Active Harmonic Filters - Strong Power Electric
      Nov 7, 2025 — How Active Harmonic Filter works. Active Harmonic Filters are connected in parallel with the loads to be compensated. T...
      Strong Power Electric
    • Active Harmonic Filter - PPI Pazifik Power, Inc.
      The PB-SERIES is an active harmonic filter system that can be used in tower buildings, automation, wind turbines, and other indust...
      PPI Pazifik Power, Inc.
    • How does an active harmonic filter or harmonic correction unit HCU work
      Active harmonic filters, also called harmonic correction units, are parallel devices that act like a noise cancellation system and...
      Eaton
    • Harmonic Mitigation (Line Side Issues & Solutions) - MTE Corporation
      Apr 12, 2018 — What Are Active Harmonic Filters? ... What are active harmonic filters? Active harmonic filters are parallel filters (
      MTE Corporation
    • Active Harmonic Filter (AHF) - Elco Power
      How AHF Works? An Active Harmonic Filter is a power electronics-based device connected in parallel with the load that requires har...
      Elco Power
    • Active Harmonic Filter - Hammond Power Solutions
      ... harmonic mitigation. It provides the advanced control and proven reliability ... Parallel system installation to accommodate l...
      Hammond Power Solutions Americas
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    Videos
    Harmonic mitigation techniques - AFE vs active filter
    YouTube · U.S. Drives and Automation Training
    Mar 12, 2024
    YouTube · U.S. Drives and Automation Training
    58:01
    Let's talk about harmonic mitigation techniques with a focus on system impact of an active front-end solution.
    U.S. Drives and Automation Training
    YouTube·
    Mar 12, 2024

    Harmonic mitigation techniques - AFE vs active filter

    YouTube·U.S. Drives and Automation Training·Mar 12, 2024
    YouTube
    In this video
    • 00:00
      Introduction
    • 01:00
      How a VFD creates harmonics
    • 04:10
      Terminology
    • 04:45
      IEEE 519
    • 07:55
      Harmonic mitigation techniques
    • 10:15
      No mitigation
    • 11:50
      Chokes
    • 13:03
      18-pulse
    • 15:48
      Passive filter
    • 17:43
      Active solutions
    • 18:19
      Active front end (ULH)
    • 21:22
      Active filter
    • 26:44
      AFE vs AF comparison
    • 33:49
      Strategy with examples
    • 42:40
      Tie breaker example
    • 46:09
      AFE vs AF analogy
    • 47:42
      Harmonic mitigation strategy
    • 51:32
      Responsibility analogy
    • 53:55
      Physical size comparison
    • 56:07
      Summary
    3 - Harmonic system solutions - how can I eliminate or cancel ...
    3 - Harmonic system solutions - how can I eliminate or cancel ...
    Oct 3, 2024
    3 - Harmonic system solutions - how can I eliminate or cancel ...
    8:03
    Active vs Passive Harmonic Filters - Hammond Power Solutions
    YouTube · Hammond Power Solutions
    Jul 19, 2022
    YouTube · Hammond Power Solutions
    42:51
    Active harmonic filters are better than passive filters for multiple VFDs, but passive filters are less expensive for a single VFD or a small number of VFDs.
    Hammond Power Solutions
    YouTube·
    Jul 19, 2022

    Active vs Passive Harmonic Filters - Hammond Power Solutions

    YouTube·Hammond Power Solutions·Jul 19, 2022
    YouTube
    In this video
    • 00:01
      Intro
    • 01:42
      Why is Power Quality Important?
    • 03:15
      Harmonic Distortion
    • 11:34
      Passive vs Active Filters
    • 12:44
      Relative current distortion
    • 18:37
      Selecting a harmonic filter
    • 24:52
      Active Filter Sizing
    • 28:29
      Q: What can be done to prevent voltage spikes in an active harmonic filter application?
    • 36:40
      Line Reactor vs DC Link Choke
    • 41:53
      Conclusion
    Feedback
    View all

    Active Harmonic Filter - HPS TruWave


    Hammond Power Solutions Americas
    https://americas.hammondpowersolutions.com › filters
    Hammond Power Solutions Americas
    https://americas.hammondpowersolutions.com › filters
    HPS TruWave™ active harmonic filter (AHF) (equivalent to Mesta Electronics DPM product) is a comprehensive and flexible solution for harmonic mitigation.Read more

    Harmonic solutions | Reduction of harmonics


    Eaton
    https://www.eaton.com › en-us › products › harmonic-so...
    Eaton
    https://www.eaton.com › en-us › products › harmonic-so...
    Avoids resonance by selecting “tuned” frequency. Typically requires system knowledge and application study/analysis. Parallel active harmonic filter, ITHD < 5 ...Read more

    400A Parallel APF active harmonic filter Panel supplies


    ZDDQ
    https://www.zddqelectric.com › 400a-parallel-apf-active-...
    ZDDQ
    https://www.zddqelectric.com › 400a-parallel-apf-active-...
    Active harmonic filter is connected in parallel with non-linear loads, and uses one set of CT to detect the load current. It calculates each order harmonic ...Read more

    Active Filters for Harmonic Elimination


    MPS | Monolithic Power Systems
    https://www.monolithicpower.com › power-electronics
    MPS | Monolithic Power Systems
    https://www.monolithicpower.com › power-electronics
    Active filters for harmonic mitigation can be broadly categorized into three types: shunt active filters, series active filters, and hybrid active filters.Read more

    Merus® A2 - Active Harmonic Filter


    Merus Power
    https://meruspower.com › Power quality solutions
    Merus Power
    https://meruspower.com › Power quality solutions
    Merus® A2 is an advanced active harmonic filter that eliminates harmonics, balances loads, and improves power quality.

    Most common types of active harmonic filters (APF)


    Diram
    https://www.diram.com › en-blog › most-common-type...
    Diram
    https://www.diram.com › en-blog › most-common-type...
    Aug 5, 2023 — It works by injecting a compensating current in parallel with the power grid, which helps to reduce harmonics and other voltage fluctuations. ‍ ...Read more

    Parallel Rack-Mounted AHF Module 30A–150A


    CoEpower
    https://www.coepowers.com › product › parallel-rack-...
    CoEpower
    https://www.coepowers.com › product › parallel-rack-...
    When connected in parallel with the nonlinear load, its harmonic currents are compensated, and the network is loaded with fundamental current only. The Parallel ...Read more

    What Are Active Harmonic Filters?


    MTE Corporation
    https://mtecorp.com › blog › 2018/04/13 › active-vs-pas...
    MTE Corporation
    https://mtecorp.com › blog › 2018/04/13 › active-vs-pas...
    Apr 13, 2018 — Active harmonic filters are parallel filters (which means the current doesn't go through the filter) that are used to reduce, or mitigate, harmonics to ...Read more

    Active filters for harmonics - AHF Series | Power Quality - irem.it


    irem.it
    https://www.irem.it › Home › Power Quality
    irem.it
    https://www.irem.it › Home › Power Quality
    The active harmonic filter works in parallel and compensates the harmonic content current, it can be chosen for applications consisting of a single or a ...Read more

    Scholarly articles for parallel active harmonic mitigation device

    … of parallel resonance and mitigation of harmonic … - ‎Ramos-Carranza - Cited by 20
    Harmonics mitigation on industrial loads using series … - ‎Adejumobi - Cited by 14
    Harmonics mitigation using active power filter: A … - ‎Salam - Cited by 238

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