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Active Power Filter

Active Power Filter
Active Power Filter
Product Code : DLAPF
Product Description

Active Power Filter is a kind of power electrical device. Its fundamental is to detect harmonic current from compensation object, then generate anti-harmonic compensation current, only leave the fundamental current in power system. APF device attracts a lot of attention. This device is an ideal device to prevent power grid "pollution" and improve power quality and save energy.

Application range

Following is the typical application range of APF:

  • site with frequency converter
  • site with imbalance loads
  • steel company
  • nonferrous metallurgy
  • harbor machine
  • electric railway
  • high precision automatic production line
  • CBD with energy saving lamp and air conditioners


APF series active power filter reached international advanced technology level. It can meet city power grid reformrequirements. It provide standard 3 phase symmetry sine voltage, compensates large capacity reactive power, harmonic current and negative-sequence current, lowers line loss.

  • Combine active power filter and passive power filter
  • DSP+FPGA all digital control system design
  •  Using advanced compensation components separation method, quick DSP operation process, system trail time is approximately 20ms.
  •  Equip perfect user interface, meets the requirements of local and remote control.
  • Automatic synchronization, no manual operation needed.
  • Modularized construction design, expandable capacity for user requirements.
  • Perfect protection function including overload, over voltage, under voltage, over current,temperature protection and self diagnosis.
  • Perfectly suitable for compensation of all harmonic, negative sequence and reactive power generated by various high-power non-linear load.
  •  According to the requirements of reactive power compensation, harmonic compensation and negative sequence compensation, device can be uniformly set to multi-functionalor single functional.

Technical parameters

working principle

APF series active power filter is parallel with system, real-time monitoring the harmonic and reactive component of load, using PWM conversion technology, inject current, which is equile to the harmonic and reactive component in value, reversed in direction, to power distribution system and realize the functions of harmonic filteration and dynamic reactive compensation.

Main Technical Parameters



Product standard

Q/XDL 17-2011

Installation site

In door cabinet

Topological structure

Power unit parallel to PWM power source

Network voltage

(+10%-20%)rated voltage,frequency 50Hz(±5%)

Compensation harmonic range

2~50 times

Response time


Switch frequency


Active power loss


Reliability index(mean time between failures)

25000 hours

Power unit control signal connection

Optical cable

Noise grade


Protection grade



Forced air cooling

Operating mode

Touch screen

Interface language

Chinese(default) English optional

Earthing requirement

Earthing resistance<1Ω

Contact Us

4th Floor, Jinfeng Building, Optical Valley International Enterprise Center, East-lake High-tech District, Wuhan, Hubei, 430074, China
Phone :86-27-87170979