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ELCO Systems 
Active Harmonic Filter (AHF)

ONE DEVICE, MULTIPLE SOLUTION

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Active harmonic filters (AHF) are the ultimate answer to  power quality problems caused by waveform distortions, low power factor, voltage variations, voltage fluctuations and load unbalance for a wide range of segments and applications.

They are a high performance, compact, flexible, modular and cost-effective type of active power filters (APF) that provide an instantaneous and effective  response to power quality problems in low or high voltage electric power systems.

They enable longer equipment lifetime, higher process reliability, improved power system capacity and stability, and reduced energy losses, complying with most demanding power quality standards and grid codes.

(Read Success Stories)

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AHFs eliminate waveform distortions from the load like harmonics, interharmonics and notching, and harmonic voltages caused by harmonic currents, by injecting in real-time the distorted current of same magnitude but opposite in phase in the electric power system.

In addition, AHFs can take care of several other power quality problems by combining different functions in a single device:

⦿ Elimination of harmonic currents and voltages.
⦿ Power factor correction (lagging or leading).
⦿ Voltage variations (sags & swells) reduction.
⦿ Voltage fluctuations (flicker) mitigation.
⦿ Load balancing in three-phase systems.
⦿ Controlled & selectable harmonic generation.

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How AHF Works?

An Active Harmonic Filter is a power electronics-based device connected in parallel with the load that requires harmonics mitigation. AHF works as a controlled current source providing any kind of current waveform in real time.
AHFs monitor the currents of the load and compensate any produced harmonic currents by generating a compensation current for each selected harmonic order in phase opposition to the harmonic current. Result is  reduction on the levels of harmonics of the installation to the limit requested by the customer ensuring compliance with power quality standards and recommendations. 

Elco Systems AHF Topology Advantages

The 3-level NPC inverter topology giving you 5 immediate advantages

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1. COMPACT FOOT PRINT - Elco System A2 module has a small footprint despite having high power density.
2. EXTERNAL POWER SUPPLIES NOT REQUIRES - The A2 is design base on self sustain and simplified design concept in mind where no external controller is required.
3. ONE AHF THAT DOES EVERYTHING - suitable for:
> 3 different Operating Mode for 3 other solutions!  
> 3W- or 4W- operations
> up to 690 VAC
> 50 Hz or 60 Hz
4. SCALABILITY WITH PARALLEL MODULES - Multiple Elco System A2 module can be stack together to run with the system to increate the system capacity.
5. EASY SERVICE - Low noise, low heat losses and vibration design makes Elco System A2 able to self sustain with less maintanence needed. 

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Mobirise themes are based on Bootstrap 3 and Bootstrap 4 - most powerful mobile first framework. Now, even if you're not code-savvy, you can be a part of an exciting growing bootstrap community.

Choose from the large selection of latest pre-made blocks - full-screen intro, bootstrap carousel, content slider, responsive image gallery with lightbox, parallax scrolling, video backgrounds, hamburger menu, sticky header and more.

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Typical Applications

AHFs have many low and high voltage potential applications where their use offers many benefits.

⦿ Equipment using variable frequency & speed drives (VFD & VSD)
⦿ Arcing devices: Electric arc furnances (EAF), discharge-type lighting (fluorescent, sodium vapor and mercury vapor) and arc welders. 
⦿ Switch mode power supplies: Computers, TVs, battery chargers, LED lightings, PLC, etc. 
⦿ UPS systems. 
⦿ Solar Inverters and wind turbine generators. 
⦿ Modulated phase controllers, cycloconverters and thyristor-controlled AC voltage regulators. 
⦿ Saturable/rotating devices: Induction heaters, transformers, generators, reactors and motors. 

Elco Systems AHF Module
One device, Multiple Solutions!

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Static Var Generator (SVG)

Compensate both inductive and capacitive fundamental reactive power with compensation done with module nominal current.  

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Active Load Balancer (ALB)

Balances negative sequence currents in Lh1.
Compensation degree Lh1 = 100% 
Unbalance wanted to mitigate by percentage 0 ... 100%

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Hybrid Var Compensators (HVC)

Solution from ELCO System AHF module combines with capacitors & thyristors. Real-time mitigation of power quality and correction of unbalance load.


Before & after ELCO Systems AHF Install
System affected by 3rd Order Harmonics

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Elco System Active Harmonic Filter (AHF) effectively mitigate THDi and THDu in the network. 
Giving you the perfect AC Sine Wave!