Presentation Description: Power converters based on wide-bandgap semiconductor technology such as SiC MOSFETs unlock higher power density and higher efficiency compared to power converters based on silicon (Si) IGBTs by virtue of their faster switching speeds. However, faster switching speed can lead to higher electromagnetic interference (EMI), which is a crucial problem for circuit designers working on grid-connected power converters that need to comply with international standards limiting the amplitudes of the low-frequency and the high-frequency current harmonics. This session will discuss electromagnetic compatibility (EMC) for a 25kW, 60kHz/47kHz switching frequency, bi-directional 3P3LT2NPC inverter. The test setup is based on IEC-61000-6-3 standard, and the conducted emissions by the inverter to the grid are measured. Thereafter, an industry-oriented three-phase passive EMI filter is designed to mitigate the conducted emissions by the inverter and measurements are performed. Learnings obtained from the conducted emissions mitigation of the inverter, which is designed for a solar PV inverter, UPS and other similar applications, will be discussed. It is observed that the results of conducted emission measurement are within the limits of the IEC-61000-6-3 Class B standard.
