Measures for the limitation of voltage distortion in the kHz range

Disturbances in industrial power systems due to oscillations of several kilohertz (1 .. 20 kHz) superimposed to the fundamental became more and more important in recent years especially in installations where the majority of the load consists of power electronics. Measurement results as well as examples from several cases of disturbances investigated by the authors is presented. The effects of these disturbances vary in a wide range such as malfunction of electronic office equipment, blown power supply units, or unacceptable noise. The paper discusses mitigation measures to solve such problems such as introducing special filters or additional damping. Specific problems and limitations of different solutions is addressed and examples provided