What is the function of an active power filter?

Active power filter is an electronic circuit used to filter out harmonics and electromagnetic interference in power loads. Its working principle is to use amplifiers, filters and other devices to filter and gain the input power signal, while amplifying or attenuating signals of specific frequencies, thereby achieving the effect of filtering out harmonics and suppressing electromagnetic interference.

The main functions of active power filters are twofold: one is to filter out harmonics, and the other is to suppress electromagnetic interference. Nonlinear components in power loads, such as rectifiers and frequency converters, can generate harmonics, which can affect the normal operation of the power supply and have adverse effects on the stable operation of electronic and electrical equipment. Active power filters can filter and gain input power signals, eliminate harmonic signals, make power signals purer, and improve the efficiency and reliability of power systems.

On the other hand, active power filters can suppress electromagnetic interference. Electronic and electrical equipment may be subject to external electromagnetic interference during operation, which can interfere with the normal operation of the equipment and cause malfunctions or failures. Active power filters can filter and gain input power signals, suppress electromagnetic interference signals, and make equipment work more stably and reliably.

In short, active power filters play a very important role in power loads. They can filter out harmonics and suppress electromagnetic interference, improve the efficiency and reliability of power systems, reduce the failure rate of electronic and electrical equipment, ensure the stable and safe operation of the power grid, and provide more reliable power equipment and support for modern industrial production.