This task is dedicated to testing and validating the initial version of the circuitry designed for online temperature monitoring, with the potential integration into the converter intended for showcasing the digital twin capability. The primary goal of this task is to comprehensively test all aspects related to the final application scenario at the laboratory level, marking the development of the first prototype.

This task to conduct essential experimental tests for the validation and characterization the measurement system intended for electric impedance offline measurements, with a potential integration into the converter. The primary focus of the tests will be to validate the design’s robustness against noise and its ability to generate the selected test vectors in an environment close to that of the final application. Additionally, the compatibility with other noise sources and the repeatability of measurements will be thoroughly studied according to the converter nominal operation.

The objective of this task is to highlight the performance enhancements achieved compared to the state of the art. The planned tests for packaged devices include static I-V characterisation, switching characteristics, and thermal resistance evaluation. All assessments will be conducted at elevated temperatures and under conditions representative of MVDC applications, taking into account the device’s breakdown voltage and nominal current. The KPI extraction phase will conclude with overload tests tailored to the specifications of the final transistors (considering nominal voltage and current levels) to demonstrate the short-circuit and unclamped inductive switching capability of the resulting devices. For packaging, thermo-mechanical tests and high-voltage isolation assessments, such as thermal and power cycling or breakdown voltage evaluations, will be integrated based on the established KPIs.

The demonstration of digital twin operation in real converters using junction temperature measurements and controlling all information will be recorded. To this end, a one-phase leg or a full unit-cell power stage pilot will be constructed and tested with all concepts developed in previous phases: digital twin, junction temperature, and offline measurements. All acquired information will be documented so that further analysis and test conditions remain as close as possible to a real MVDC operational point. The effectiveness of online temperature monitoring, digital twin technologies, and other monitored parameters will also be assessed.