Active harmonic filters

The AHFI is a modern, universally usable active harmonic filter for the reduction of harmonics and reactive power. Due to the possible parallel connection of up to five filters, it is possible to tune the power to the network loads which exist on site. Furthermore, power reserves for highly dynamic reactive power and for load symmetries can be deployed.

User interface - Control unit

User-friendly graphic display with high resolution (128 x 64 Pixel) ensures an easy and reliable reading of the information. The generous designed display allows the user to read multiple information at one glance. The intuitive designed menue handling ensures a comfortable setting of parameters and retrieval of information. The help function gives additional user support.

High dynamics during changing harmonic distortions or phase shifts

Many consumers in industrial networks e.g. frequency converter, drives, welding machines etc. take non-sinus-shaped or unsymmetrical currents from the network. These currents generate harmonic currents and lead...

to additional thermal losses in cables, distribution panels and transformers.
to changes to the voltage curve shape so that other consumers (controls; PCs) can be destroyed or operation negatively influenced.
to unstable network conditions caused by unsymmetrical currents.

Up to 5 units work simultaneously

Due to the possible parallel connection of up to five filters, it is possible to tune the power to the network loads which exist on site. Furthermore, power reserves for highly dynamic reactive power and for load symmetries can be deployed.

Function

The AHFI harmonic filter is connected parallel to the harmonic producers. The AHFI analyses the harmonic range caused by nonlinear consumers and feeds a counter-phase harmonic compensation current into the network. The AHFI can filter all harmonics up to 50th harmonic. It can feed all harmonics simultaneously; whether it is the full spectrum up to a 50th or individually selected harmonics. This means that the respective harmonic distortions are neutralised at the connection point.

In addition to the good filtering effect due to the large bandwidth and excellent peak current properties of the AHFI, the extremely high dynamics (i.e. fast reaction to changing harmonic loads) represent a fundamental advantage of the AHFI harmonic filter. Active harmonic filters are based on an electronic filter concept with a DC intermediate circuit as an energy buffer. The active harmonic filter is the most highly developed filter concept with the best filter results.