Optical Sensing Applied to Thermal Observers for Enhanced Reliability of Power Modules

Condition Monitoring using thermal variables has been identified as one of the most critical aspects when assessing the performance and degradation of Power Modules (PMs). Different sensing technologies and algorithms have been proposed in order to develop high-performance reliability-driven control of PMs. This paper focuses on the application of contact-based fiber optic temperature sensors in thermal observers. These sensors have the potential to become key enhancers of real-time thermal monitoring applications. One specific power systems application is evaluated by assessing the dynamic capacity of converters under contingency operation via digital twins. The assessment of the dynamic capacity is limited to the most critical element, which normally corresponds to power electronics due to their small time constant. The application of these sensors extends the safety range of operation based on real-time operational data, rather than based on design.


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