Differential mode noise prediction and analysis in single and three phase grid-tied inverters for the frequency range of 9-150 kHz

In recent years, power electronics (PE) converters have witnessed an ever-increasing advancement, especially PE converters operating within the switching frequency of 2-150 kHz. Seen from the technical perspective, one major concern is the lack of systematically understanding of Differential Mode (DM) noise propagation into the power grid within 9-150 kHz regarding the upcoming emission standard (i.e., 61000-6-3). Hence, accurate modeling of the different power converters is needed to characterize low-frequency EMI emissions up to 150 kHz. Further, this analytical model needs to extend to single-phase and three-phase applications. To tackle those issues, a new analytical estimation approach is proposed to model and analyze DM EMI noise of grid-tied inverter within the 9-150 kHz frequency range. Notably, the proposed method characterizes the generated emission based on the double Fourier analysis and closed-loop admittance. The provided comparative simulation analysis is shown the proposed method's ability to successfully estimate the EMI emission for the considered case studies with an error of less than 1.3 dB in most frequency ranges.