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Effective fault diagnosis for mission-critical and safety-critical systems has been an essential and mandatory technique to reduce failure rate and to prevent unscheduled shutdown. A novel optimization deep belief network (DBN) in this study has been proposed for a closed-loop single-ended primary-inductance converter (SEPIC) fault diagnosis. Firstly, the wavelet packet decomposition technique is...
The implementation of diagnostic methodologies to power devices and converters has become essential and critical in many fields. A lot of previous research demonstrated detection of hard faults, such as open or shorted switching elements in the power systems. However, little progress has been made on soft faults diagnosis. The soft faults related to components degradation degrade the system's performance...
For discontinuous-working devices, storage and work states may appear alternately. The health state of the device can be monitored by observing key performance parameters in engineering, which can be also taken as a basis to predict and analyze life and reliability of the device. For this kind of device, this paper comprehensively analyzes performance degradation mechanism in storage and working conditions,...
Metalized film capacitor is a kind of product with a long lifetime and high reliability, so it is difficult to assess its lifetime and reliability using the traditional statistical inference based on the large sample of data from the lifetime test. Therefore, first, this paper presents a type of test called T performance degradation test, which is divided into several stages. During the test, the...
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