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Conventional fault analysis algorithms may not be suitable for the AC/DC hybrid systems. To solve this problem, a mathematical model for HVDC (High Voltage Direct Current) system, which is suitable for analyzing faults in AC system, is presented in this paper. Firstly, based on the switching functions method and sequence components method, an equivalent model of HVDC converter under the asymmetric...
The conventional fault analysis methods and fault analytical models may not be feasible for the AC-DC hybrid systems because of the highly nonlinear time-varying converters. To solve the problem, the paper presents a mathematical model for the analysis of the performance of HVDC converter during the AC faults, especially asymmetric faults. The model is developed using the improved switching functions...
The conventional fault analysis algorithms and fault analytical models may not be suitable for the ac/dc hybrid systems because of the highly nonlinear converters. To alleviate the problem, the paper presents a steady state short-circuit converter model based on the switching function theory for analyzing faults in the ac system, including asymmetric faults. In order to regard the effect of the short-circuit...
Spectrogram is a main analysis method of audio signals and other similar quasi - stationary ones and produces a time-frequency portrait of a signal. This paper researches correspondence between important time-frequency structures and music representations of vocal performance, aiming at providing quantitative analysis and objective information description of the subjective perception of specific voice...
Voltage fluctuation and flicker is an important aspect of power quality. The core of flicker analysis is to track the envelope of voltage signals and then calculate the short-term flicker severity Pst, which is the premise of flicker source location. This paper firstly derives the formulas of extracting flicker envelope of signals containing harmonics using Teager energy operator and Hilbert transform...
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