How does an active harmonic filter work?

An active harmonic filter continuously measures the electrical current, identifies harmonic components, and generates an equal current in the opposite phase. This reduces harmonic distortion seen by the electrical supply.

What is an active harmonic filter used for?

Active harmonic filters are used to reduce harmonics caused by non-linear loads such as Variable Frequency Drives, UPS systems, rectifiers, and other non-linear loads.

What is the difference between an active and passive harmonic filter?

A passive filter is typically designed around specific harmonic frequencies. An active harmonic filter dynamically adapts its compensation as electrical loads change.

Can one active harmonic filter compensate several VFDs?

Yes. An active harmonic filter can be installed centrally to compensate harmonics from several VFDs and other non-linear loads. This is one of the main advantages of centralized active harmonic filtering.

How do I choose an active harmonic filter?

The filter should be selected based on the harmonic spectrum, required compensation current, electrical network, installation point, and target harmonic levels. Power quality measurements and harmonic calculations provide a reliable basis for sizing the solution.

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Q: What is an active harmonic filter?

An active harmonic filter is a power electronic device that dynamically reduces harmonic distortion. It measures harmonic currents and injects an opposite compensating current to cancel them.

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What is an active harmonic filter and how does it work?

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