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Power Electric System is always in transformation and to follow this modifications protective devices needs of upload these settings. Tradicional protection techniques require new coordination study and manual adjustment on the relays. This paper present an adaptive protection method to promotes a better performance of power protection system. Using this technique was obtained a significant reduction...
This paper presents a high impedance fault (HIF) location method in distribution systems. The estimation of the HIF location is carried out by using an artificial neural network (ANN). The ANN inputs are both three phase currents and its energy of the Wavelet Coefficients obtained during the HIF. The Wavelet mother function used was Daubechies 48. The ANN was trained and the performance of the proposed...
This paper presents a novel filter design technique based on the maximal overlap discrete wavelet transform (MODWT). Time and frequency response of the designed filters are compared to the ones of traditional discrete Fourier transform (DFT) based filters. The obtained results show improvements on response speed when comparing to full cycle traditional filters and improvements on frequency response...
Nontechnical losses are a major problem in Brazil as in many developing countries. This paper proposes a methodology that quantifies sources of nontechnical losses and their regional distribution using Bayesian Network. This is a probabilistic graphical model in which a problem is structured as a set of variables linked through probabilistic relationships. Five groups were inspected through random...
This paper presents an efficient fault location scheme for distribution systems. The proposed method was developed by make use available measurements in the substation. The first step identifies the number of reclosings from the information about the current wavelet coefficients. In the second one, the fault location is provided by a set of decision rules, which are obtained from the voltage and current...
The optimal control of voltage profile with mono-phase voltage regulators banks in radial distribution feeders is presented. The formulation is made as a combinatorial optimization problem and solved by a Genetic Algorithm. The used optimization criteria are: voltage profile centred in the normal range, losses and costs reductions. The proposed method determine: the location and optimal adjustments...
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