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Power quality filters


active power quality filter
active power quality filter active power quality filter active power quality filter active power quality filter active power quality filter

Power quality filters

Power Quality Filter(Active Power Filter APF) is connected in parallel with non-linear loads, and uses one set of CT to detect the load current. It calculates each order harmonic current by FFT algorithms in its DSP microchips, and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmonics.APF not only eliminates harmonic current from the load side, but it also mitigates harmonic voltage caused by harmonic currents. The APF system can also improve power factor (PF) and correct load imbalances in the power system.

  • Brand:

    ZDDQ

  • item no.:

    ZD-AMS

  • Payment:

    T/T,L/C

  • product origin:

    China

  • Color:

    RAL7035

  • shipping port:

    Shanghai

  • Lead Time:

    15days
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  • Product Detail

Overview of APF

ZDDQ Power Quality Filter /Active Power Filter(APF) is a perfect comprehensive solution to power quality problems with power grid such as harmonic wave(can filter 2nd to 50th harmonic interference completely), reactive power, and 3 phase load unbalance.

Power Quality Filter APF is connected in parallel in power grid, to detect the harmonic wave in power grid in real time, generate the reverse-phase compensation current through the converter, and dynamically filter the harmonic wave in power grid. The operation of APF is unaffected by power grid structure and load type, and it will not produce harmonic oscillation with the system, thus perfectly realizing harmonic wave control of various loads.

Power Quality Filter APF can also realize dynamic reactive compensation, and control the capacitor switching, to improve the power factor of power grid. Meanwhile, APF has the function of controlling the 3 phase load current unbalance, thus comprehensively solving various power quality problems with power grid.

active harmonic filter modular
 active harmonic filter modular
Active Power Filter module Rack type Active Power Filter panel


Technical Specification

Rated Voltage AC 308V-480V
Electric Connection   3P3W/3P4W
Rated Frequency     50Hz (60Hz) +/- 10%
Rated Current per Module 30Amp,50Amp, 75Amp, 100Amp,150Amp
Rated Current per Cabinet  30~600Amp (module combination)
Redundancy   Each module is an independent filtering system
Harmonic Elimination Range  2nd ~ 50th order (Selectable)
Compensation Mode Compensate Harmonics,Reactive Power,Phase imbalance
Harmonic Filtering Performance Filter up to 98% harmonics at rated load
THDv/THDi THDv<3%, THDi<5% after filtering
Reactive Power Compensation Capability  Both inductive and capacitive reactive power compensation
Imbalance Correction Capability  Mitigate negative and zero sequence
Full Response time  <5ms
Instant Response time <100us
Thermal Loss ≤3% of AHF rated capacity (kVA)

Email us hanson@chinazddq.com,or click Active Power Filter Datasheet to download details.


APF principles

Power quality filter APF is connected in parallel with non-linear loads, and uses one set of current transformers (CT) to detect the load current. It calculates each order harmonic current , and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmonics.
The APF not only eliminates harmonic current from the load side, but it also mitigates harmonic voltage caused by harmonic currents. The APF system can also improve power factor (PF) and correct load imbalances in the power system.
active Harmonic Filter Principle
 AHF Interface
Active Power FIlter Principle Active Power Filter Interface

APF Benefits

■Ultra-fast reactive power compensation(Inductive and capacitive).

■Harmonic Compensation up to 50th harmonic(Individual selectable).

■Load balancing between phases and unloaded neutral wire.

■Flicker compensation.  

■Reduce overheating/Redue nuisance tripping/Reduce overloading/ Reduce equipment failure.

■Improve Reliability.    

■Compact Design and Modular system.

■Grid resonance detection.

■User-friendly HMI menu operation.

■Ethernet and ethercat system for interconnection.

■High performance and reliability.

■Insensitive to network/grid condisitons.

■Simple installation.

APF SVG R&D Team
 apf svg assemble line APF SVG Aging and reliability test APF SVG Assemble line APF SVG Aging and reliability test
APF SVG R&D Team
 APF SVG aging and reliability Test


APF application

■Industrial installations with a set of non-linear loads representing more than 500kVA (variable-speed drives, UPSs, rectifiers, etc.)

■Installations requiring power-factor correction.

■Installations where voltage distortion must be reduced to avoid disturbing sensitive loads

■Installations where current distortion must be reduced to avoid overloads

Following are typical application industries of Power Quality Filter(Active Power Filter）. 

active harmonic for crane and conveyor system
 active harmonic filter for solar power plant
 active harmonic filter for oil and gas industry
 active harmonic filter for electric arc furnace and metling furnace
active harmonic filter for water and wasted warter treatment
active harmonic filter for wind and pv power farm
 active power filter for primary elements industry

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