Theoretical connection from the dielectric constant of films to the capacitance of capacitors under high temperature

Abstract

In the process of coping with energy and environmental protection issues, technologies such as energy materials, energy devices, and energy systems have made great progress. With excellent performance, film capacitors play an increasingly important role in energy‐related fields. With the increase of application scenarios and the continuous development of film material technology, it is urgent to establish a better theoretical connection from films to capacitors. First, the main components of the capacitor including the film and the positional relationships among them are given. Then, from the two perspectives of indirect calculation according to the volume and the direct calculation according to the winding process, the equation between the dielectric constant of films and the corresponding capacitance of capacitors is established. Further, the measurement data and error analysis results of the built test platform prove the accuracy and great potential of the proposed calculation methods. In addition, error sources, including film thickness uniformity, are listed. Finally, the challenges faced by the proposed calculation methods and the paths that can be referenced for future research are summarised and discussed.

Data sonification of film capacitors

“…How to improve the sensitivity of sonification methods for handling data with small change characteristics is a worthy question in the future. To process larger-scale film capacitors data, methods to enhance the processing efficiency [42] with guaranteed accuracy [8,33] should likewise be explored. In addition to adjusting the configuration of sonification parameters according to individual preferences, the development of sonification schemes for different data variation characteristics is also something that needs to be studied.…”

“…The sonification method, the idea of analysing the sonification results, and the sonification framework proposed in this paper open up new technical paths for the understanding of the mechanism of novel film capacitors made of new materials in new environments. The new experiences gained from them can also help guide the targeted optimisation of dielectric materials [33]. Specifically, these lessons derived from the data sonification results can inform the AI‐based design [34–36] of dielectric materials during model construction.…”

Effect of thermal stress on the life of DC link capacitors for smart grid

“…DC link capacitor (DCLC) is based on MPFC technology that acts as a critical component of power electronics. It has been mainly used to sustain the voltage, store energy and filter harmonics as well as to provide power for instantaneous energy transfer and realize reactive power conversion with load or power supply [8][9][10] . DCLC can be divided into two categories according to the type of insulation medium used: dry DCLC and oil-immersed DCLC.…”