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This paper deals with analysis of power signals using complex wavelet transform. In the first step power signals containing sag, swell, harmonic, sag-harmonic, swell harmonic, transient and spike were generated using Matlab. Various features like energy, kurtosis, entropy, skewness etc. were extracted using `db4' and complex wavelet decomposition up to 11 levels. Next, an extensive database of these...
This paper presents the applications of the Wavelet Transform (WT) for analyzing fast transient signals originated from fault events in power grids with presence of power electronics-based controllers and its protective devices. The study cases included emphasizes the wavelets ability to discriminate signals originated by the fault events from those injected by power controllers, like the TCSC and...
The paper presents a harmonic detection method based on wavelet transform and FFT for electric arc furnaces system. The method not only overcomes the drawbacks of conventional Fourier transform, analyzing transient, non-stationary or time-varying event invalidated, but also avoids the disadvantages that only use wavelet transform can not obtain the precise value at a particular harmonic frequency...
Coal mines distribution network is a non-solid earthed power transmission system, which are routinely subjected to single phase to ground fault, when fault appears, fault current is weak, which is very difficult to find the fault point. Because of the wave speed is not sure, the existing methods of fault location based on traveling waves are not perfect. In this paper, a new fault location method...
Transmission line protection is an important issue in power system engineering because 85-87% of power system faults are occurring in transmission lines. This project work presents a technique to detect and classify the different operating conditions in transmission lines to contribute quick and reliable operation of protection schemes. Discrimination among different transient conditions of transmission...
This paper shows the application of S-transform in identifying the voltage disturbances such as sag, interruption, swell and harmonics. S-transform is suitable for the analysis of power quality disturbances under noisy condition as it has excellent time-frequency resolution characteristics and has the ability to detect the disturbance correctly. Various voltage disturbances are generated as per IEEE...
A wavelet-based digital directional relay for power transformer protection, implemented using field programmable gate array. The general purpose SPARTAN3E FPGA kit was employed for developing the prototype relay, with all the coding done using the hardware description language VHDL. The relay logic consists of two parts: disturbance detection based on first-level high-frequency details of the voltage...
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