How Much Do You Know About Active Harmonic Filters?

Active harmonic filters suppress electrical distortion. It injects reverse current to eliminate unwanted harmonics. Unlike passive filters, it responds in real time to purify the power.

We all know that when a harmonic filter is working, the sensor detects harmonic noise. At this time, the controller calculates the correction value, and the reverse current is injected by the inverter, which will immediately eliminate the distortion. This process keeps the voltage and current stable, protects the equipment and improves efficiency. Active harmonic filters inject currents that are equal to the detected harmonics but opposite in phase, thereby effectively canceling out the harmonics.

Active harmonic filters can achieve real-time monitoring and real-time response, detect problems in time and deal with them immediately. They can handle multiple harmonic orders at the same time and can protect equipment efficiently. This is also the main reason why the industry chooses to use active harmonic filters.