- 14 November 2007 -

Filter eliminates harmonic distortion

Danfoss Drives has developed an active filter that it says virtually eliminates harmonic distortion in water and wastewater applications for maximized grid capacity, as well as system wide operational efficiency and reliability.

"Harmonic mitigation is known to the water and wastewater sector, but primarily based on 18 pulse transformers and passive filter options. These options have a number of limitations and can only mitigate harmonics at the individual drive in a static set of conditions, and will not improve system efficiency," says Henrik Gedde Moos, director of Danfoss Drives.

The active filter is based on the company's VLT variable frequency drive technology and is engineered to mitigate harmonics to a lower level than passive and 18 pulse options from either the drive or the common point of coupling. The active filter can adapt to and perform in a dynamic set of conditions with variations in the installation, while improving the power factor and cancelling harmonic distortion.

www.danfoss.com