Active Harmonic Filters (AHF), also known as Active Harmonic Filter (AHF), help maintain clean and stable power by detecting and canceling harmonic currents in real time. Harmonics are unwanted distortions generated by non-linear loads such as variable frequency drives, welding systems, and computer equipment. The filters continuously monitor the current, analyze the harmonic content, and inject a compensating current of equal magnitude and opposite phase to neutralize distortion within the network. Besides harmonic mitigation, these filters also improve power factor and enhance voltage stability through dynamic reactive power compensation. They are widely used in industrial facilities, data centers, and commercial buildings where high power quality is essential for reliable and energy-efficient operation.

• Active harmonic filters (AHF) monitor load currents in real time and track harmonic variations with millisecond-level precision. They generate compensating currents equal in amplitude and opposite in phase to the detected harmonics, achieving accurate suppression and rapid compensation. This quick response helps prevent equipment overheating and false triggering.
• Intelligent algorithms identify harmonic characteristics and automatically adjust compensation strategies according to load changes and grid impedance variations. This adaptive control prevents harmonic amplification common in conventional LC filters, suppresses system resonance online, and maintains stable operation without manual intervention.
• PWM (Pulse Width Modulation) control technology allows the filter to remove harmonics across a wide frequency range, typically from the 2nd to the 50th order. This precise filtering improves current waveform quality, enhances power factor, and helps reduce energy losses along the distribution lines.
• Compact structure available in wall-mounted or rack-mounted designs. The plug-in modular layout simplifies installation, reduces downtime, enhances electromagnetic compatibility, and minimizes space and maintenance requirements.
• Integrated Compensation Functions Active harmonic filters (AHF) integrate multiple compensation features that work together to maintain clean and stable power quality across complex electrical networks.
  1. Harmonic Filtering: Supports full-spectrum or selective harmonic elimination, effectively reducing total harmonic distortion (THDi).
  2. Reactive Power Compensation: Dynamically regulates inductive and capacitive reactive power to maintain an optimal power factor.
  3. Three-Phase Balancing: Four-wire configuration eliminates neutral line overload and corrects load imbalance.
• High Performance High performance is achieved through advanced current control and efficient power conversion design, ensuring stable operation even under dynamic conditions.
  1. Current Control: High switching frequency (up to 20 kHz) balances low ripple current with fast dynamic response, effectively counteracting harmonic distortion.
  2. Conversion Efficiency: Filtering performance remains stable regardless of load or grid impedance changes. Resonance and harmonic amplification are avoided, line losses are reduced, and transformer load capacity is improved.
• System Capabilities Comprehensive system capabilities ensure flexible operation, wide compatibility, and reliable performance across various industrial and energy applications.
  1. Intelligent Operation: Equipped with a full-feature monitoring system that provides real-time analysis of harmonic spectra, compensation performance, and equipment status. Multiple operating modes are available, including harmonic filtering priority, reactive power priority, and combined control.
  2. Compatibility: Applicable to various environments such as photovoltaic and wind power systems, effectively suppressing high-order harmonics produced by inverters.
  3. Scalability: Modular design supports N+1 parallel redundancy and easy capacity expansion. Even when one module is replaced, system operation remains unaffected. Centralized control ensures uniform performance across all connected modules.
  4. Reliability: Maintains rated output even when harmonic current exceeds nominal capacity. Prevents resonance with grid impedance and remains stable under voltage and frequency fluctuations, with integrated reactive compensation enhancing overall stability.
• Equipped with SiC module technology that supports high switching frequency, low power loss, and strong voltage and temperature resistance. These features enhance power density, improve thermal stability, and increase overall system efficiency.