<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, an extended impedance-based fault-location formulation for generalized distribution systems is presented. The majority of feeders are characterized by having several laterals, nonsymmetrical lines, highly unbalanced operation, and time-varying loads. These characteristics compromise traditional methods performance. proposed method uses only local voltages currents as input data....

In this study, further improvements regarding the fault location problem for power distribution systems are presented. The proposed relate to capacitive effect consideration on impedance-based methods, by considering an exact line segment model line. developments, which consist of a new formulation and algorithm that considers shunt admittance matrix, equations developed any type result in one single equation all ground types, another line-to-line faults. Results obtained with Also, order...

Increasing deployment of information technologies and low-inertia renewable energy sources into smart grid fuel the uncertainties reveal security transient stability problems. Enhancing margins grids despite cyber physical disturbances emerges need for cyber-aware robust controller design. Therefore, a distributed nonlinear is proposed to improve synchronous generators (SG) in presence excessive communication delay cyber-physical disturbances. The uses phasor measurement units receive...

High-impedance fault location has always been a challenge for protection engineering. On the other hand, if this task is successfully realized, maintenance action could be performed in order to avoid potential injuries. For an effective scheme, high-impedance should performed, but lack of research on area noted. This paper proposes new analytical formulation power systems. The approach developed time domain, considering model consisting two antiparallel diodes. Using model, distance and...

Fraud detection in electricity consumption is a major challenge for power distribution companies. While many pattern recognition techniques have been applied to identify theft, they often require extensive handcrafted feature engineering. Instead, through deep layers of transformation, nonlinearity, and abstraction, Deep Learning (DL) automatically extracts key features from data. In this paper, we design spatial temporal learning solutions nontechnical losses (NTL), including Convolutional...

Power distribution automation and control are important tools in the current restructured electricity markets. Unfortunately, due to its stochastic nature, systems faults hardly avoidable. This paper proposes a novel fault diagnosis scheme for power systems, composed by three different processes: detection classification, location, section determination. The classification technique is wavelet based. fault-location impedance based uses local voltage fundamental phasors. determination method...

This work is a survey of current trends in applications PMUs. PMUs have the potential to solve major problems areas power system estimation, protection, and stability. A variety methods are being used for these purposes, including statistical techniques, mathematical transformations, probability, AI. The results produced by techniques reviewed this promising, but there be performed context implementation standardization. As smart grid initiative continues advance, number intelligent devices...

Fault resistance is a critical variable in distance relaying. If not considered due to underreaching phenomenon, it may cause the misoperation of ground relays for internal faults. Still, as consequence overreaching unbalanced nature loads and asymmetry lines can affect protection operation efficiency. Mainly these aspects, there low precision zone limits relays. In this paper, new algorithm proposed increase limits, improving efficiency process. The method based phase coordinates uses fault...

In this paper a geometrical approach is described to detect, identify, and recover multiple gross errors in power system state estimation. Using the classical WLS estimator, measurement residuals computed, then error composed. For detection identification of measurements with errors, composed normalized form (CME <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">N</sup> ) used. The magnitude corrections otherwise are performed using (CNE). To give...

In this study, the innovation approach is used to estimate measurement total error associated with power system state estimation. This required because equations are very much correlated each other and as a consequence part of measurements errors masked. For that purpose an index, index (II), which provides quantity new information contains proposed. A critical limit case low II, it has zero II its totally words, does not bring any for gross test. Using measurement, masked by estimation...

Power system restoration (PSR) has been a subject of study for many years. Many techniques were proposed to solve the limitations predetermined guidelines and procedures used by majority operators restore following occurrence wide area disturbance. This paper discusses encountered in some currently PSR improvement based on artificial neural networks (ANNs). The scheme is tested 162-bus transmission compared with breadth-search scheme. results indicate that use ANN power feasible option...

Apresenta-se uma revisão integrativa sobre estudos que abordam as relações entre profissionais de saúde e usuários durante práticas em saúde. Objetivou-se identificar os aspectos pesquisados no cotidiano dos serviços acerca dessas relações. A coleta foi realizada nas bases Lilacs Pubmed segundo descritores: acolhimento; profissional-família; profissional-paciente; humanização da assistência; a palavra 'vínculo' associada ao descritor Sistema Único Saúde. Selecionaram-se 290 publicados 1990...

This paper presents an extended methodology based on the transmission line modeling method (TLM) aiming at a soil ionization representation for simulation of grounding systems. natural phenomenon can be represented by considering variation conductive components present in TLM circuit. The proposed analytical formulation is introduced with focus computational implementation one dimension. not subject to divergent solutions, being numerically stable and incorporated into general algorithm...