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Active Harmonic Filters


Active filters are power electronic devices connected in parallel with the load to be compensated. The device can be thought of as a controlled current source, which provides any kind of current waveform in real time.

When connected in parallel with the nonlinear load, its harmonic currents are compensated and the network is loaded with fundamental current only. The control system monitors the relevant parameters of the network and is capable of detecting and instantaneously reacting to any disturbance in the load current.


Our AHF series is an advanced modular Active Harmonic Filter (AHF) system. The AHF system is constructed of one or several filter modules with system controller. Filter modules and controller, both are embedded in our standard cabinets. CT terminations are fixed in a standard cabinet, and the AHF capacity can be configured accordingly to user requirement. The filter capacity can be easily expanded at the user’s site by adding extra filter modules as per site requirement.


  • Designers have more choices with flexible configuration
  • Capability to expand vertically as well as horizontally
  • Higher operating temperature up to 50 Deg. C.


  • IGBT paralleling technology
  • Intelligent air cooling technology
  • High quality components of international brands
  • Advanced production technology
Rated Voltage AC 415V +20% to – 20% (Other Voltages on request)
Electric Connection 3P3W/3P4W
Input Voltage THT with stand Up to 15%
Harmonic compensation range 2nd ~ 50th order (Selectable)
Harmonic compensation degree 0 ~ 100% (Selectable)
Harmonic Elimination Rate Up to 98%, grid side after elimination THDu< 3%, THDi< 5%*
Reactive Power Compensation Capacity Positive, Negative, Zero Sequence Reactive
Full response time < 20ms
Instant response time < 100us
Thermal Loss ≤ 3%
Output Current Limitation Automatic ( 100% rated current )
MTBF > 100,000 hours
Switching Frequency 60kHz
Controller DSP control
Communication Modbus Protocol, RS232/485

Download Product Catalogs:
  • Active Harmonic Filter (AHF) Catalouge