A Statistical Approach to Predict the Low Frequency Common Mode Current in Multi-Converter setups

The aim of this paper is to explore a statistical approach to predict the distribution of the harmonics of common mode current in a setup consisting of N converters, knowing the common mode current for a single converter. To this end, we utilize Pearson’s random walk approach in comparison with a simulation setup consisting of 4 DC/DC converters with their own DC sources. The two methods, compared with respect to a selected harmonic of the common mode current, show good agreement up to 10MHz – 501st harmonic of the 20kHz switching frequency. The arising mismatch could be due to limitations of our model as well as to computational errors.