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With the development of Chinese high-speed railway system, the safety of CTCS-3 system is drawing more and more attention. Hazop is a useful method to conduct hazard identification for the CTCS-3 system. In this paper, a complete process of identify the potential hazard of CTCS-3 onboard system on the basis of UML sequence diagram is shown, which can find out the hazards through analysis of every...
The power quality (PQ) signals are traditionally analyzed in the time-domain by skilled engineers. However, PQ disturbances may not always be obvious in the original time-domain signal. Fourier analysis transforms signals into frequency domain, but has the disadvantage that time characteristics will become unobvious. Wavelet analysis, which provides both time and frequency information, can overcome...
With the wide application of sensitive power electronic devices in industry, the power quality (PQ) disturbance problems become more concerned. The S-transform is a time-frequency localization technique that bridges the gap between the short-time Fourier transform and wavelet transform. A new PQ disturbances identification method based on S-transform time-frequency analysis and fuzzy expert system...
This paper proposed a power quality disturbances classification system based on wavelet transforms and novel probabilistic neural network (PNN). Wavelet transform is utilized to extract feature vectors for various power quality disturbances based on multi-resolution analysis. The decomposition signal is divided into 5 equal length bins in each level. Root mean square (RMS) value of the wavelet coefficients...
Identification, localization and classification of power quality disturbance is the precondition of appropriate mitigation actions that can be taken. However, the signal under investigation is often corrupted by noises, especially the ones with high frequency signal produced by EMI. A new de-noising method is proposed to improve the classification performance for power quality disturbance. The proposed...
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