Advanced FANs Technology in Active Harmonic Filter

Active Harmonic Filters (AHFs) use advanced FANs (Field-Programmable Gate Array-based Active Noise Cancellation) technology, along with other key technologies, to mitigate harmonic distortions in electrical systems. Here’s how FANs and related technologies are applied in AHFs:

1. Core Technologies in Active Harmonic Filters:

• Instantaneous Harmonic Detection:

  • Uses Fast Fourier Transform (FFT) or pq Theory (Instantaneous Power Theory) to detect harmonics in real time.

  • FPGA (Field-Programmable Gate Array) enables ultra-fast signal processing for real-time compensation.

• PWM (Pulse Width Modulation) Control:

  • High-frequency switching (using IGBTs) generates anti-phase harmonics to cancel distortions.

  • FPGA-based controllers ensure precise PWM signal generation.

• Closed-Loop Feedback Control:

  • Continuously monitors the grid and adjusts compensation dynamically.

  • Adaptive algorithms (often AI-based) optimize filtering performance.

2. Role of FANs (FPGA-Based Active Noise Cancellation) in AHFs:

• High-Speed Processing:

  • FPGAs allow parallel processing, making AHFs respond in microseconds.

  • Ideal for dynamic loads (e.g., variable-speed drives, data centers).

• Low Latency Compensation:

  • Unlike DSPs (Digital Signal Processors), FPGAs minimize delay, improving harmonic cancellation accuracy.

• Adaptive Filtering:

  • Some AHFs use machine learning (neural networks) to predict harmonic patterns and adjust filtering dynamically.

3. Advantages of FANs in AHFs:

✔ Faster response than traditional DSP-based filters.
✔ Higher accuracy in harmonic elimination (up to 95-98% THD reduction).
✔ Scalability for industrial applications with complex harmonic profiles.

4. Comparison with Passive Harmonic Filters:

FANs (FPGA-based processing) enhance Active Harmonic Filters by enabling real-time, adaptive harmonic cancellation, making them ideal for modern power systems with nonlinear loads (VFDs, SMPS, etc.). This technology ensures higher efficiency, lower THD, and better grid stability compared to passive solutions.