Enhanced Impedance Measurement to Predict Electromagnetic Interference Attenuation Provided by EMI Filters in Systems with AC/DC Converters

Due to the widespread integration of renewable energy sources connected AC and DC power systems by means electronics converters, electromagnetic noise propagates along lines, metallic earth-return structures. EMI filters are commonly used mitigate common mode differential at interface distribution their suppression characteristics usually assessed in standard test setups, impedances which are, however, scarcely representative real-world applications. In this paper, an online, inductively coupled impedance measurement method is proposed. A sensitivity analysis highlight benefits proposed setup experimental verification performed. The enables non-intrusive energized systems, including converters. These measures, turn, allow evaluation modal insertion losses operating conditions. three-phase example considered study shows significant deviations from manufacturer specifications, thus justifying need for more advanced estimation techniques.