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Transient power quality problems is the salient problem in today's power quality problems. And its detection is the precondition of monitoring and restraining. Wavelet package transform with better time frequency resolution is developed on the wavelet transform. The signal is decomposed on the wavelet package plane and the characteristic weights of signal can be achieved using available information...
The Degree of automation in rural distribution network is very lower, so the fault location work mostly depends on analysis about trouble call information. The paper analyzes uncertain factors in trouble call information and fault inference process, applies Bayesian inference to build fault location reasoning model, design the reasoning algorithm. The algorithm is implemented in rural distribution...
A crucial problem for improving interharmonic detection precision is how to reduce the influence from harmonic spectral leakage. This paper analyzes the character of the power system's spectral leakage, and puts forward a new interharmonic detection method. First, measures harmonic component with windows and interpolated FFT, then, filters away the harmonic component from the original signal, last,...
In order to achieve meticulous management in reliability of power supply, the system of MBO (management by objective) is studied based on power distribution network GIS platform. First, a new coding method which used GUID (Global Unique Identifier) technology is integrated in spatial database design. The codes can describe completely the topological structure of distribution network which is necessary...
This paper used the multi-class classification for support vector machine and combined with the good amplitude-frequency characteristic of Fourier transform,the good time-frequency characteristics of wavelet transform and the excellent statistical learning ability of support vector machine to make the classification and recognition to the disturbances of power quality. Mathematical modeling for the...
This paper analyses the principle of work of using phase-shifting method to detect power quality (PQ) disturbances based on Hilbert transform (HT). This method is proposed by using phase-shifting for real-time detection on various PQ disturbances, such as voltage swells, voltage sags, voltage fluctuation, harmonics and transient oscillation. Based on the detection platform of LabVIEW environment,...
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