Pearson's random walk approach to evaluating interference generated by a group of converters

According to the EMC Directive 2004/108/EC requirements: “where an apparatus is capable of taking different configurations, the electromagnetic compatibility assessment should confirm whether the apparatus meets the protection requirements in the configurations foreseeable by the manufacturer as representative of normal use in the intended applications”. However there are no precise descriptions of how to evaluate the electromagnetic compatibility of a system consisting of many interference sources, neither in the EMC Directive nor in the harmonized standards. The aim of this paper is to evaluate the aggregated interference caused by a group of power electronic converters [1] using a simplified model of DC/DC converters and Pearson's random walk approach.