Active Harmonic Filters

Harmonics Limits as per IEEE 519
Harmonic compensation up to 50th harmonics
Response speed of our harmonic filters is <300μs
Ensure the total harmonic pollution does not exceed a level of 8%

Active Harmonic Filters AHF

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

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Overview

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

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

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

Features-benefits

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<3% at full load, and THDI<4% at half load.
Correctable harmonic correction out the 2nd-51th harmonics, eliminate the possible harmonic currents in real time and reduce various harmonic distortions.
Advanced high-speed igbt ensures the stability and reliability of the device. Protect equipment from harmonics generated by other industrial operations.
Advanced current-limiting control link, when the harmonic current in the system is greater than the capacity of the active power filter, the automatic current-limiting output is at 100% capacity.

Applications

Specifications

ZB AHF	3 phase 3 wire	3 phase 4wire
Rated compensation current	50A—400A	50A—400A
Working voltage (V)	400V(-20%~+15%)	400V(-20%~+15%)
working frequency	50/60 Hz	50/60 Hz
Filtering ability	THDi<3%(Rated)	THDi<3%(Rated)
Filter range	2~50 harmonics	2~50 harmonics
Single harmonic compensation rate adjustment	Compensation current limit for each harmonic	Compensation current limit for each harmonic
Transient response time	<100us	<100us
Full response time	<10ms	<10ms
Active power loss	<3%Rated	<3%Rated
Correct three-phase imbalance	Yes	Yes
Reactive power compensation function	Yes, power factor can be set	Yes, power factor can be set
Overload protection	Automatic current limit at 100% rated output	Automatic current limit at 100% rated output
Operating frequency	20KHz	20KHz
UI	5.7 inch touch screen	5.7 inch touch screen
Display state	Grid parameters such as current and voltage	Grid parameters such as current and voltage
communication	Modbus,RS485,RS232	Modbus,RS485,RS232
Installation method	Wall hanging, cabinet	Wall hanging, cabinet
Ambient temperature	-10℃~40℃	-10℃~40℃
Storage environment	-40℃~65℃	-40℃~65℃
Relative humidity	Maximum 95%, no condensation	Maximum 95%, no condensation
Altitude	Below 1000 meters	Below 1000 meters

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How Active Harmonic Filter works

Active Harmonic Filters are connected in parallel with the loads to be compensated. They measure the current of the non-linear load and inject the same harmonics, but with opposite phase angle. The current of the active harmonic filter thus cancels out the harmonic currents of the load, and only fundamental frequency current component is left to be supplied from the power system.

In addition to current and voltage profile smoothing by harmonic current mitigation, the active filters also provide fast fundamental frequency reactive power compensation and balance loads in three-phase systems. Reactive power compensation stabilizes voltage, mitigates flicker, releases additional capacity for transferring more active power in the existing electrical network and improves the power factor. Fast response to reactive power changes is important.

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Active Harmonic Filters

Active Harmonic Filters AHF

How Active Harmonic Filter works

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