Control and characterization of electromagnetic emissions in wide band gap based converter modules for ungrounded grid-forming applications

Electromagnetic emissions of a 1.2kV, 120A SiC-based half-bridge switching at 100kHz that includes grounding paths and that can be extended to a 100kVA inverter and, eventually, systems of paralleled and cascaded inverters suitable for shipboard and solar farm applications is studied. This switching pole forms the basis of a test platform specifically designed to discover sensitivities to resonant paths so that design guidelines for peripheral structures and EMI mitigating components can be developed. Ungrounded grid-forming inverters are considered in this work because such systems present a worst case scenario when it comes to the effects of resonances through grounding paths being excited by “near-RF” frequencies associated with Wide Band Gap implementations.