Circuit model-based methods for condition monitoring of capacitors in power electronic converters involve using mathematical models of the capacitor and the converter
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AI Customer ServiceIn this study, the characteristics of capacitor are measured by using the function of B-H analyzer. In contrast to impedance analyzer measurement, the B-H analyzer can be used to measure
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AI Customer ServiceData Driven Methods gives promising results in condition monitoring of capacitors. Capacitors are an important component of power conversion systems because they affect the cost, size, performance, and range of such systems. However, capacitors have the highest degradation and failure rates of any power converter component.
The performance of a capacitor expressed in terms of the capacitance (C) depends on the dimension/geometry of the plate/electrode and the dielectric constant of the material, where the dielectric can be defined by insulating medium having permittivity, with no AC power losses or DC leakage.
Challenges in condition monitoring of capacitors Despite the existence of established and emerging methods, condition monitoring of capacitors presents its own challenges. The main challenge is the degradation mechanisms of the capacitor which involves the factors such as temperature, stress, humidity, aging and others.
In the future, it is expected that the use of data-based methods will become increasingly prevalent in the field of condition monitoring for capacitors used in power converters. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Circuit model of a practical capacitor (redrawn and reprinted with permission ) Leakage resistance R p shown parallel to C arises in the capacitor due to the resistivity, and it represents the dielectric loss, which are much larger than the frequency-dependent loss.
These phenomena can be modeled with the ideal capacitor values by inserting ESR in the circuits.
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