Computational Framework to Assess EMI of Grid-Connected Inverters as Function of Topology and PWM Scheme

This work describes a fully integrated computational framework to estimate conducted emissions of 3-phase grid-connected inverters as a function of the used circuit topology and switching modulation schemes. The circuit’s functionality is emulated mathematically using Python to obtain the Common-Mode (CM) and Differential-Mode (DM) time domain output voltage waveform, which is post-processed using a software-emulated EMI receiver. The result is an accurate prediction of unfiltered frequency domain raw emissions, while providing the flexibility to compare different inverter topologies and pulse width modulation strategies with least amount of time and effort. Additionally, the framework allows to introduce disturbances on modulation as well as inverter level for a comprehensive analysis.