SCALE-FREQUENCY ANALYSIS OF POWER QUALITY DISTURBANCES
作者： B K Panigrahi , R Panda , S Behera
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摘要: This paper presents harmonic analysis of power quality disturbances in scale-frequency domain. A suitable scheme has been proposed for signal using orthonormal basis functions with compact support. These are band-pass nature. One can choose filter center frequencies easily. It shown that the respective outputs associated harmonics distorted under consideration. Hence, present may be useful disturbances. Moreover, this technique provides a precise analysis. method The and monitoring is an important task area system engineering. Power closely different problems caused by harmonics, or over voltages supply discontinuities. In general, variable speed drives arc furnaces, nearby faults motor starting, capacitor switching discontinuities during autoreclosure. well known effects on steady state On other hand, usually more transitory (i.e. very short time duration). So reliable identification ensure utilities to reinforce its customers. Hence there strong need analyzing processing tools. Transient were analyzed wavelets (5)-(7). Wavelet applied assessment (8). Some researchers have also used wavelet applications (9), (10). Harmonic voltage discrete short-time Fourier transform (11). use engineering justified paper, we propose set spline purpose. Compact support B-spline (12), (13) makes them attractive such applications. approximate modulated Guassian optimally localized. examples presented reveal suitability accuracy scheme. II. HARMONIC ANALYSIS OF POWER QUALITY DISTURBANCES section, terms functions. symmetrical normalized additional resolution factor m given as,
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