Modelling and reduction of common mode currents in a variable-speed drive system by two-port network approach

In this paper, a modelling approach based on specific experimental measurements and on two-port networks is addressed. This mixed frequency-domain model allows us to simply calculate or estimate common mode (CM) currents in each part of any existing complex variable-speed drive systems. The validity of the model is satisfactorily confirmed by comparison between measurement and numerical simulation. Using the validated two-port network model, investigation on parameters influence can be carried out to know which parameters in the considered system are the most dominant, and in which way CM currents can be efficiently reduced or eliminated in order to ensure the reliability of the whole system in terms of Electromagnetic Compatibility (EMC), especially for the embedded electronics in aeronautics.