Active Harmonic Filters: Your Shield Against System Resonance

Modern power systems face a hidden threat: resonance. This occurs when harmonic currents from non-linear loads (like VFDs and rectifiers) match the electrical system's natural frequency. The result? Dangerous amplification of harmonic voltages and currents, leading to capacitor failures, overheating, and equipment damage.

Traditional passive filters can ironically cause this problem by introducing new resonant points into the network.

The Active Harmonic Filter (AHF) solves this. It's an intelligent device that monitors harmonics in real-time and injects opposing currents to cancel them. Its key advantage in preventing resonance is its adaptive, non-passive design.

How AHFs Avoid the Resonance Trap:

• No Fixed Components: Unlike passive filters, AHFs don't add fixed inductors/capacitors that alter the system's resonant profile. They act as a dynamic damper.
• Adaptive Operation: AHFs constantly analyze the changing network (e.g., from switching loads or capacitors) and adjust their response. They don't have a fixed tuning point that can become problematic.
• Active Damping: Advanced AHFs can detect and inject signals specifically to suppress emerging oscillations before they reach dangerous levels.

An AHF provides dual protection: it reduces harmonic distortion and, crucially, enhances system stability by preventing resonant conditions. In dynamic electrical networks, this makes the AHF not just a filter, but a vital guardian of reliability and safety.

Any technical question or inquiry, please contact us.sales@yt-electric.com