Overview of Active Harmoinc Filter Active Harmonic Filter(AHF) is a perfect comprehensive solution to power quality problems such as harmonic wave, reactive power, and 3 phase load unbalance. AHF is connected in parallel in power grid, to detect the harmonic wave in real time, generate the reverse-phase compensation current through the converter, and dynamically filter the harmonic wave. The operation of AHF 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. AHF can also realize dynamic reactive compensation, and control the capacitor switching, to improve the power factor. Meanwhile, Active Harmonic Filter has the function of controlling the 3 phase load current unbalance, thus comprehensively solving various power quality problems with power grid. Principle of Active Harmoinc Filter Key Features of Active Harmonic Filter Multifunctional: Harmonic, reactive power and imbalance compensation High harmonic filtering rate: Up to 98% Excellent reactive compensation: High speed, Precise (-0.99≤PF≤0.99), Step-less, Bi-directional (capacitive and inductance) compensation Excellent imbalance correction: Both negative and zero sequence, mitigates neutral current Wide input voltage & frequency range, adapts to tough electrical environments Low thermal loss (≤3% of rated AHF kVA), efficiency ≥ 97% High stability: Infinite impedance to grid, avoids harmonic resonance problems Flexible application: Modular design, embedded in standard or customized cabinet Easy installation and maintenance: Plug-in installation for AHF module replacement and expansion Wide capacity range: 30A~600A for a single cabinet, up 10 cabinets in parallel Environmental adaptability: -10~50°C temperature, compatible with diesel generator Complete protection: Grid Over/Under voltage, AHF over current, over temperature, and more. All faults are recorded in the event log, which is convenient for failure analysis Typical Application of Active Harmonic Filter Harmonics occur usually as follows, ◆Overheating of transformers and conductors ◆Generator instability ◆Capacitor failure ◆Nuisance tripping of fuses and circuit breakers ◆Damage to or failure of sensitive electronic equipment including drive failure ◆Telephone interference ◆Motors experiencing overheating, audible noise and reduced service life ◆High energy costs ◆Downtime and loss of production due to equipment instability. AHF Modular Datasheet Number of phases (system input) 3-phase 3-wire or 3-phase 4-wire Rated frequency 50/60Hz Rated voltage 400 V ±20% Response time <5ms Harmonic mitigation performance 2nd to 50th harmonic Filter Efficiency >97% Total harmonic current distortion THDi <5% Reactive power compensation Rate >0.98(inductive and capacitive compensation) 3 phase unbalance compensation effect <5% Active Loss of system <3% Inverter topology IGBT Controller DSP+FPGA Current ...
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