Mitarbeitende

Ursachen, Ausbreitungswege und Wechselwirkungen von PE-/PA-Strömen sowie Modellierung von Komponenten an der Motorseite

In industrial applications, power electronics play a crucial role in regulating and distributing power to various components of a system. Variable frequency drives (VFDs) are widespread in industrial applications to drive induction motors due to their efficiency and flexibility. The non-ideal switching

devices generate an unwanted common-mode voltage in addition to the desired voltages. The common-mode voltage (CM- voltage) can cause a common-mode current (CM-current) to

flow because of parasitic inductive and capacitive coupling in the motor and cables. This CM-current can propagate to nearby systems through the protective earth wire (PE) and the equipotential bonding and can cause damage to other devices and unnecessary downtime because of an unwanted trigger of the residual current devices (RCD).

The project has the following objectives:

-Systematization and description of the causes and propagation paths of PE/PA currents

- Creation of a modelling environment and a model library with which PE/PA currents up to a frequency of 150 kHz can be mathematically estimated and determined

- Comparison of the models using measurements on a reference system