Active Harmonic Filters

An Active Harmonic Filter is most common application reducing harmonic pollution within electrical installations, helps ensure ‘clean’ current. An active harmonic filter requires a stable external power source to inject phase opposite current harmonics to downstream loads. Dependent on the stability of the connected external power source, its efficiency will vary. The proliferation of electronic switching devices increase in the amount of harmonic pollution in the electrical distribution systems, the harmonic currents may overload the equipment and cables, resulting in (energy) losses and unnecessary heating of cables and components, temperature buildup resulting in a fire.

• Improve life of power equipment
• Increased efficiency and performance
• Reduces risks by reducing harmonics
• The harmonic filter easily can adapt to changing loads
• Autonomous detection and dynamic filtering of harmonic currents present

Active harmonic filters, as known as active power filter is an excellent harmonic filter correction units. provides best-in-class performance including dynamic harmonic mitigation and power factor correction, to eliminate irregular harmonics caused by nonlinear loads.It adopts DFT detection algorithm technology, and precise calculates each order harmonic current, through intelligent control, injecting reactive current into the power distribution system to remove damaging harmonic currents and cancel out the load harmonics. Therefore, the problems of low system power factor, large harmonic current and high voltage distortion rate are solved, the system stability is improved and power factor improvement.

Due to the increasing usage of non-linear loads such as VFDs, harmonics are being introduced into the power grid which is contributing to poor power quality and leads to overheating of equipment and nuisance faults. AHF not only eliminates harmonic current from the load side, but it also mitigates harmonic voltage caused by harmonic currents. The AHF system can also improve power factor (PF) and correct load imbalances in the power system.

AHF adopts a modular design, Usually, AHF can be composed of one or more AHF modules and an optional LCD panel. Each AHF module is an independent harmonic filtering system, and the user can change the rating of the harmonic filtering system by adding or removing AHF modules.

According to the different mounting type, it can be divided into: Modular AHF and Wall-mounted AHF

Modular AHF can be embedded in AHF cabinets, containing circuit breakers, cable segments, surge protection devices, and LCD panels, etc. Modules in the cabinet are available, up to 12 AHF modules can be placed in parallel. It is used in textile industry, foundry industry, automobile industry and other industries.

Wall-mounted AHF can be installed on a wall, which is suitable for low rating applications, and all-mounted AHF according to customer requirements.

• Reduce line current harmonic pollution and current distortion
• Meets IEEE-519, EN 55011 and other power quality requirements
• Provide wide range power quality solutions, improve energy efficiency.
• Active harmonic filter can handle multiple non-linear, harmonic-generating loads.
• Modular design, flexible embedded in cabinets, Full range of active filters from 50-400 Amps.
• Reliable lightning surge protection device protects equipment from damage when lightning occurs.
• Reduce harmonics to less than 5% total demand distortion (TDD) at the point of common coupling.
• Active power filters can work with multiple drives; when the active filter reaches its limit, it won’t overload.
• passive harmonic filter vs active harmonic filter, active harmonic filter more advanced and comprehensive.
• Current distortion rate of the power supply side is THDI

Industries including auto parts processing industry, metallurgical industry, steel industry, mining industry, chemical fiber textile industry, large power plants, petroleum processing industry, medical facilities, industrial HVAC, renewable energy, data centers and commercial buildings, etc. and variable frequency and variable speed drives in large industrial electrical installation processes