Active Harmonic Filter (AHF)

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.

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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

ELCO SYSTEMS AHF

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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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.