About AHF

Active harmonic filters (AHF) are the ultimate answer to power quality problems caused by waveform distortions, low power factor, voltage variations, voltage fluctuations and load unbalance for a wide range of segments and applications. They are a high performance, com pact, flexible, modular and cost-effective type of active power filters (APF) which provide an instantaneous and effective response to power quality problems in low or high voltage electric power systems. They enable longer equipment lifetime, higher process reliability,improved power system capacity and stability, and reduced energy losses, complying with most demand ing power quality standards and grid codes.

AHFs eliminate waveform distortions from the loads like harmonics, inter harmonics and notching,and harmonic voltages caused by harmonic currents, by injecting in real-time the distorted current of same magnitude but opposite in phase in the electric power system. In addition, AHFs can take care of several other power quality problems by combining different functions in a single device.

ARK's active power filter (APF) can achieve 2 to 50 harmonic full compensation, the compensation rate can be freely set by the customer, the output compensation current changes with the harmonic content of the system, to help you get good power quality. Different loads produce different harmonic content, and the harmonic content will change dynamically under different working conditions.

AHF Working Principle

External CT detects the load current, DSP as CPU has advanced logic control arithmetic, could quickly track the instruction current, divides the load current into active power and reactive power by using the intelligent FFT, and calculates 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 generates opposite phase compensation current on inverter induction, at the same time 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.

Feature

• Advanced algorithm
• Three-level topology 

One more output level, less ripple current; output pulse width modulation waveform is closer to sine wave; harmonic compensation effect is better; LCL filter volume is reduced, which is conducive to the modular design of AHF; less inductance loss, improve system efficiency; IGBT pressure stress is halved; Effective reduction of switching losses · IGBT switching losses are less, heat margin is larger, and switching frequency is higher

• Modular  Design

Ultra-compact design, wall-mounted and rack-mounted construction, and fine capacity allocation meet customer needs for space-limited applications and retrofit projects. Easy to transport and replace, easy to integrate into the cabinet. Flexible engineering cabinet design, plug-in cabinet, IP54 cabinet, top and bottom cable inlet design to meet the needs of different customers.

• Independent air duct design

The upper and lower layered design, the IGBT radiator and inductor, which occupy most of the heat of AHF, are concentrated in the lower layer, forced air cooling, rapid heat dissipation, does not affect the upper PCBA upper PCBA auxiliary air duct design, expand the heat dissipation channel, wide Angle heat dissipation

AHF Technical Specifications

Type Code

AHF Product Appearance

Model Range

*The table is the standard specification, if you need other sizes, please contact us for customization

Model Range

*The table is the standard specification, if you need other sizes, please contact us for customization

Model Range

*Cabinet 1 size: 800*1000*2200 mm,Can accommodate 5 modules.

*Cabinet 2 size: 800*1000*1600 mm,Can accommodate 3 modules.

*The table is the standard specification, if you need other sizes, please contact us for customization