Active Harmonic Filter (AHF)

High Quality Harmonic Control Scheme

- 2nd to 50th harmonic mitigation

- Real-time compensation

- Modular design

- Protect equipement from being over heated or failure

- Improve working efficiency of equipment

Excellent filtering performance
Modular design
Multiple compensation modes
Use high-end components
Safe and reliable

Active Harmonic Filter (AHF) An active harmonic filter is a type of electronic device that is used to mitigate or eliminate harmonic distortions in electrical power systems. Harmonic distortion refers to the presence of unwanted frequencies in the power system that can lead to issues such as increased heating of equipment, reduced system efficiency, and even equipment failure.

AHF operates by sensing the harmonic currents in the system and generating a counter-current of the same magnitude and opposite phase. This counter-current cancels out the harmonic current and prevents it from being fed back into the power system. Active harmonic filters are designed to be fast and accurate in their response to changing harmonic conditions in the power system.Active harmonic filters are commonly used in industrial and commercial settings where there are high levels of non linear loads, such as variable frequency drives, uninterruptible power supplies, and computer equipment. They are also used in power quality improvement applications in residential and commercial buildings.

Working Principle

Active Harmonic Filter (AHF)

With the load current detected by external CT, DSP as CPU has advanced logic control arithmetic, could quickly track the instruction current, divide the load current into active power and reactive power by using the intelligent FFT, and calculate the harmonic content rapidly and accurately. Then it sends PWM signal to internal IGBT's driver board to control IGBT on and off at 20KHZ frequency. Finally, it generates opposite phase compensation current on inverter induction. In the meanwhile, CT also detects the output current and negative feedback goes to DSP. Then DSP proceeds the next logical control to achieve more accurate and stable system.

Application Field

petrescence

Harmonic source: thyristor, inverter

Harmonic equipment: speed fan, all kinds of pumps
Garbage power generation

Harmonic source: rectifier, inverter

Harmonic equipment: all kinds of pumps
semiconductor

Harmonic source: thyristor, single crystal furnace

Harmonic equipment: quartz crucible, thyristor

Iron and steel smelting

Harmonic source: rectifier, inverter, thyristor

Harmonic equipment: blast furnace, converter, intermediate frequency furnace,Electric arc furnace, transmission system
Data center industry

Harmonic source: UPS, rectifier

Harmonic equipment: switching power supply, UPS, variable frequency air conditioning, elevator, energy-saving lamp
Sewage treatment

Harmonic source: inverter, rectifier

Harmonic equipment: fan, pump (condensate pump, circulation pump, feed pump, injection pump)

nosocomium

Harmonic source: rectifier, UPS, inverter

Harmonic equipment: electronic medical precision equipment, energy-saving lamps, elevators, escalators, UPS
Drilling platform

Harmonic source: rectifier, inverter

Harmonic equipment: AC generator set (DC power supplied by thyristor rectifier), derrick, winch, top drive, turntable, mud pump
Car charging pile

Harmonic source: rectifier

Harmonic device: charger

Automobile manufacturing

Harmonic source: inverter, rectifier

Harmonic equipment: automatic welding machine, conveying system, carbon dioxide welding, punching machine
Paper industry

Harmonic source: halogen lamp, inverter

Harmonic equipment: pulper, frequency conversion air conditioning, paper cutting, halogen lamp, overpressure machine, CNC machine tool, arc lamp
Modern architecture

Harmonic source: rectifier, inverter

Harmonic equipment: switching power supply, variable frequency air conditioning, elevator, energy-saving lamp, thyristor dimming system, large LED equipment