Alfredo Bonini Neto

São Paulo State University | Unesp · Faculdade de Ciências e Engenharia - FCE

With the growth of smart grids, consumers now have access to new technologies that enable improvements in the quality of service provided and allow new levels of energy efficiency. Much of this increase in energy efficiency is directly related to changes in consumption habits due to the quantity and quality of information made available by new tech...

Total real and reactive power losses in electrical power systems are an inevitable phenomenon and occur due to several factors, such as conductor resistance, transformer impedance, line reactance, equipment losses, and phase unbalance. Minimizing them is crucial to the system’s efficiency. In this study, an artificial neural network, specifically a...

Aging, degradation, or damage to internal insulation materials often contribute to transformer failures. Furthermore, combustible gases can be produced when these insulation materials experience thermal or electrical stresses. This paper presents an artificial neural network for pattern recognition (PRN) to classify the operating conditions of powe...

The application of mathematical models using biotic and abiotic factors for the efficient use of fertilizers to obtain maximum economic productivity can be an important tool to minimize the cost of soybean (Glycine max (L.) Merr.) grain yield. In this sense, using Artificial Neural Networks (ANN) is an important tool in studies involving optimizati...

Due to the worldwide water supply crisis, sustainable strategies are required for a better use of this resource. The use of magnetic water has been shown to have potential for improving irrigation efficacy. However, a lack of modelling methods that correspond to the experimental results and minimize error is observed. This study aimed to estimate t...

This paper presents an alternative methodology to obtain the precise amount of shunt reactive power compensation in order to simultaneously reduce the total reactive power losses, improve the voltage profile and increase the loading margin of power systems. The amount of shunt reactive power compensation to be allocated is determined based on the c...

The investigation and application of recovery techniques associated with the use of qualitative and quantitative indicators enable the ecological restoration of these sites. In this context, the main difficulty consists of establishing the A horizon, capable of supporting the emergence of other horizons, choosing appropriate species, and adding org...

This article presents an alternative Newton-Raphson power flow method version. This method has been developed based on current injection equations formulated in polar coordinates. Likewise, the fast decoupled power flow, elaborated using current injection (BX version), is presented. These methods are tested considering electrical power systems comp...

Integrated Crop–Livestock–Forestry Systems (ICLFS) offer stakeholders sustainable options to produce goods and services. Those additionally manifest as enablers of environmental conservation of soil functioning. We, therefore, analyzed the quality of Ultisol for physical and chemical properties under restorative or regenerative models of long-term...

Agriculture is one of the pillars of human existence since it allows for the obtention of food as well as other products for food production processes. In this regard, there are some crops, such as climactic fruits, that face difficulties especially regarding classification of their maturation stages at the time of harvest, which is the case of ban...

This paper presents the ANN (Artificial Neural Networks) approach to obtaining complete P-V curves of electrical power systems subjected to contingency. Two networks were presented: the MLP (multilayer perceptron) and the RBF (radial basis function) networks. The differential of our methodology consisted in the speed of obtaining all the P-V curves...

This work presents an approach using artificial neural networks (ANN) to obtain complete P-V curves of electrical power systems subjected to contingency. The differential of this methodology is in the speed in obtaining all the P-V curves of the system, under normal operating conditions or with contingencies. The great advantage of using ANN models...

This work presented a version for the power flow method via current injection fast decoupled, BX version. A comparative study between some existing techniques in the literature for solving the power flow based on power injection equations and on current injection equations is presented. Results for different loading values and R/X transmission line...

Brazil is currently the 4th world’s largest banana producer, producing around 7 million tons. In this scenario, several studies have been developed with a large amount of data, such as climatic, morphological, and nutritional data, in an attempt to improve these numbers even further. This study aims to classify banana ripening stages by artificial...

Loading margin evaluation is one of the essential tasks of power system voltage stability analysis. Conventional methods for loading margin calculation are based on continuation power flow techniques. Recently, there is growing interested to apply artificial neural network (ANN) techniques to rapidly predict the loading margin. However, traditional...

Através das ferramentas do software MatLab, neste trabalho foi desenvolvido uma interface gráfica para a estimativa de produção de capim-marandu utilizando-se de redes neurais artificiais e das propriedades gráficas disponibilizadas pelo software, visando além da assertividade e eficiência da estimativa, o desenvolvimento da interface de maneira qu...

A qualidade da melancia é determinada pelo total de açúcares, coloração, aparência, dentre outras. Estas, assim como a produtividade, podem ser afetadas pela relação entre fonte e dreno, sendo necessário estudar novas técnicas de manejo para adequação dentro da cadeia produtiva, destacando-se a poda das hastes. O método de condução tutorado em mini...

Hoje em dia, a qualidade e a continuidade do fornecimento de energia elétrica são essenciais para nosso modo de vida. Assim, para se manter o sistema operando de forma segura e evitar-se o colapso de tensão, passou-se a monitorar a estabilidade estática de tensão durante a operação em tempo-real do sistema elétrico de potência. Neste contexto, o ob...

Nos tempos atuais as organizações se deparam com mudanças intensas a todo o momento, tornando a gestão de pessoas cada vez mais estratégica e propensa a buscar ferramentas de análise dos indivíduos da organização, para decifrar continuamente as expectativas dos colaboradores. Estes impactos vieram junto com o cenário dinâmico do mercado e da global...

Este trabalho apresenta os resultados obtidos com um procedimento alternativo para definir a quantidade de compensação reativa shunt a ser alocada, visando à redução das perdas e a melhoria da margem de estabilidade estática de tensão. A quantidade de compensação reativa shunt a ser alocada é determinada com base nas curvas de perda total de potênc...

Hoje em dia, com o aumento da demanda de energia elétrica, os sistemas elétricos de potência vêm operando cada vez mais próximos dos seus limites. Neste contexto, este trabalho tem por objetivo desenvolver uma metodologia para traçado completo das curvas P-V em condições normais de operação e também submetidos a uma contingência. Também é feito uma...

Increases in production and final quality of the sugarcane crop require the search for new management and evaluation techniques within the production system, which can range from water and nutritional management, such as the application of water saving irrigation associated with sources (conventional and alternative) and phosphorus doses combined w...

Proper soil management techniques are essential to keep the soil healthy and without degradation. When this is not possible, this soil must be recovered, taking into account the attributes of the soil and its regenerative power, with this, several techniques are being used. In this context, this work aims to develop an interactive program (analyze...

O excesso de massa corporal predominantemente na região abdominal do corpo favorece o surgimento de várias doenças, dentre elas as dislipidemias e os distúrbios cardiovasculares. Nesse contexto, o índice de conicidade (IC) é uma alternativa viável para indicar obesidade abdominal. O objetivo deste estudo foi verificar se o índice de massa corporal...

Os solos brasileiros são classificados em 13 ordens, com base em suas características definidoras. Os latissolos e os ultissolos predominam, compreendendo mais de 50% de todo o território. Portanto, o objetivo deste trabalho foi estudar os principais atributos físicos do solo e o conteúdo de matéria orgânica para avaliar as atribuições e limitações...

The objective of this study was to study the physical attributes and the organic matter of a Red-Yellow Oxisolcultivated with Urochloa decumbens pasture in recovery with different introducing ways of Stylosanthes cv. Campo Grande. Theexperiment was conducted at the Agency for Agribusiness Technology of São Paulo (APTA), in the municipality of Andra...

Increasing water use efficiency in agricultural systems is critical as it results in economic and environmental cost reductions, especially in localized irrigation, which depends on a number of factors, especially the flow rate of the emitters and proper uniformity of water distribution, both with respect to direct with the pressure of the emitters...

Proper soil management interferes in the result of the installed crop. The knowledge of the positive and/or negative influence on the production systems is essential to improve the physical, chemical and biological quality of the soil and, for that, there are some attributes that act as indicators of soil quality. Practices carried out improperly w...

The Oxisols is predominant in 54% of Brazilian territories and characterized by high weathering, relatively low chemical properties, and adequate structure. This study aimed to analyze the Oxisols through an Artificial Neural Network (ANN) with the purpose of estimating its recovery in function to soil chemical and physical attributes. The chemical...

Hoje em dia, a busca por ferramentas que facilitam e até mesmo substituem o trabalho humano têm ganhado grande destaque mundial. As redes neurais artificiais (RNAs) é uma dessas ferramentas, pois apresentam uma quantidade de aplicações, principalmente quando se trata de classificação de dados, reconhecimento de padrões, análise de imagens, entre ou...

Atualmente, a tendência contínua de aumento nas demandas de carga, juntamente com as restrições econômicas e ambientais para a construção de novas usinas e linhas de transmissão, levou os sistemas de energia a operar mais próximos de seus limites, aumentando a probabilidade de ocorrência de problemas de estabilidade. Neste contexto, o objetivo dest...

The electricity sector, especially in emerging countries, has experienced several transformations, mainly resulting from the increase of electricity demand. This encourages more investment in the generation sector and causes increasing concerns with the development and improvement of tools for static voltage stability analysis of electrical power s...

The purpose of this paper is develop an interactive program to study of the continuation power flow. Both, the graphical user interface and the power flow program have been developed in the Matlab environment and it allows the direct change of information between both. Besides, it provides not only a good computational performance, but also an user...

The electricity sector, especially in emerging countries, has experienced several transformations, mainly resulting from the increase of electricity demand. This encourages more investment in the generation sector and causes increasing concerns with the development and improvement of tools for static voltage stability analysis of electrical power s...

In the literature, a study to analyze stability and voltage instability is related to the P-V curve (power versus voltage magnitude) and the maximum loading point (MLP) (point on the curve that separates the stable operation of the unstable). The maximum loading point may be consequent to a saddle node bifurcation (SNB) related to transmission capa...

A concentração de gordura na região abdominal está intimamente ligada a risco de doenças cardiovasculares e metabólicas. Para isso o índice de conicidade (IC) representa um indicador de obesidade abdominal, sendo considerado um bom indicador para avaliar os fatores de risco cardiovasculares. Diante disso algumas ferramentas computacionais como as r...

This paper presents a comparative analysis of the influence of PV bus representation on the convergence characteristics of the Newton-Raphson Current Injection method. The methods used for solving the power flow problem are based on current injection equations written in polar coordinates. Several tests are presented to clarify the reasons of non-c...

Atendendo a demanda mundial por alimentos de melhor qualidade e isentos de defensivos agrícolas sintéticos, meios alternativos vêm sendo estudados para o controle de fungos. Os fungos do gênero Penicillium sp. são conhecidos como fungos de armazenamento que degradam a reserva das sementes diminuindo sua viabilidade. Diante disso, objetivou-se avali...

This study aimed to evaluate the Artificial Neural Network (ANN) to establish a classification and analysis of degraded soils and its recovery in response to lime and gypsum application. The analyzed degraded soil was classified as Oxisol, and the physical attributes considered were: soil density, soil porosity (macroporosity and microporosity) and...

This study aimed to develop a fuzzy mathematical model to estimate the impacts of global warming on the vitality of Laelia purpurata growing in different Brazilian environmental conditions. In order to develop the mathematical model was considered as intrinsic factors the parameters: temperature, humidity and shade conditions to determine the vital...

In recent years, the concern for voltage stability issue has gained global highlighted when referring to the energy sector industry, this is because this issue is related to the operation and planning of electrical power systems. Factors such as the increasing energy demand, the transfer of large amounts of power to meet the consumption, combined w...

It is important to monitor the physical quality and soil chemistry to maintain or modify the incorrect soil management. In this sense, the objective of this study was to evaluate the physical properties to monitor soil quality in different types of management. The experimental design was completely randomized, with three treatments: natural vegetat...

This paper presents a proposed Newton decoupled method modification (simultaneous resolution algorithm and alternate) with the addition of an equation line passing through of a point in the plane determined by the variables: loading factor and the nodal voltage magnitude of a bus k. The use of this parameterization technique eliminates the singular...

The electricity sector has gone through several transformations due primarily to increased electricity demand, especially in emerging countries. This encourages more investment in the generation and leads to a growing concern about the development and improvement of static voltage stability tools of power systems. This paper presents a geometric pa...

RESUMO As Redes Neurais Artificiais (RNA) sao modelos computacionais que se assemelham aos neuronios biologicos, capaz de realizar aprendizado e manipular informacoes recebidas. O trabalho foi dividido em duas partes, em que a primeira descreve o estudo da rede neural artificial Retropropagacao (backpropagation) enessa segunda partesao apresentadas...

RESUMO A degradacao dos solos e caracterizada pela mudanca na qualidade da estrutura, provocando diminuicao no tamanho dos poros, especialmente dos macroporos, o que leva a reducao na area da secao transversal para o fluxo de agua. Com isso, o objetivo deste trabalho foi avaliar a retencao de agua de um Latossolo em recuperacao com adubos verdes. O...

Interconnected power systems not only allow to the areas to provide mutual assistance, but also import or export energy with respect to optimize energy resources assessment where, a cost reduction involved in the generation of power required to meet its demand. To determine the required control actions, in the planning and operation stages, it is i...

The aim of this work was to compare the effect of the use of organophosphated fertilizer and filtercake with mineral sources on biomass productivity, agronomic and technological characteristics of plant-cane and the economic return. The experiment was installed in Iturama/MG in a randomized blocks design with five repetitions, being the treatments:...

Objetivou-se neste trabalho comparar o efeito do uso de fertilizante organofosfatado e torta de filtro com fontes minerais na produtividade de biomassa, caracteristicas agronomicas e tecnologicas da cana-planta e o retorno economico obtido. O experimento foi instalado em Iturama/MG, em delineamento experimental em blocos casualizados com cinco repe...

Artigo Completo In recent years the preoccupation with the voltage stability subject has been gaining attention worldwide when it refers to the energy sector industry, this is due to the fact that this issue is related to the operation and planning of electrical power systems. Factors such as the increasing demand for energy, the transfer of large...

Artigo Completo Hoje em dia, com um mundo cada vez mais competitivo, as indústrias estão sujeitas a uma série de restrições impostas devido a vários fatores, tais como problemas ambientais e financeiros, recursos cada vez mais escassos e caros, custos elevados dos serviços e dos salários entre outros. Por isso, como as restrições em torno das indús...

The use of vegetation cover to protect the soil and increase the soil organic matter content available to plants is a good practice to minimize loss of soil quality. The effect of soil management practices on the objective of this study was to evaluate the soil quality under different types of management. A completely randomised experimental design...

Neste trabalho é apresentado o desenvolvimento de uma interface gráfica, ou seja, um programa iterativo, para o estudo da estatística descritiva em dados de produção de soja no Brasil. O objetivo principal é fazer um programa simples e de fácil entendimento e que possa ser utilizado em diversas áreas de aplicação, inclusive na área de engenharia de...

O uso do solo nem sempre dá lugar a um novo sistema ecológico sustentável, seja de lavouras ou de pastagens. Com isso, solos utilizados intensamente e de forma inadequada, são levados à degradação. Técnicas que visam à recuperação de solos degradados têm sido investigadas. Neste sentido o presente trabalho teve por objetivo estudar a influência do...

Neste trabalho é apresentado o desenvolvimento de uma interface gráfica, ou seja, um programa iterativo, para o estudo da análise de correlação de Karl Pearson entre duas variáveis. O objetivo principal é fazer um programa simples e de fácil entendimento e que possa ser utilizado em diversas áreas de aplicação, inclusive na área de engenharia de Bi...

Redes Neurais Artificiais são modelos computacionais inspirados na maneira como um organismo vivo manipula as informações recebidas e com isso, possuem capacidade de aprendizado, adaptabilidade e generalização do conhecimento. Além disso, o modelo de processamento de uma Rede Neural Artificial é baseado no paralelismo, assemelhando-se como o cérebr...

Neste trabalho é apresentada uma análise de Regressão pelo método dos Mínimos Quadrados que tem por finalidade prever um resultado a partir de uma sequência de dados conhecidos. É utilizado o software Matlab para criação da interface gráfica tornando o programa mais iterativo para o usuário. O programa também auxilia na resolução do sistema de equa...

Soil cultivation with annual or perennial crops cause the destructuring of the same. The monitoring of physical and chemical quality of the soil is important to maintain or modify the soil management, case be incorrect. Annual crops that require preparation at each cycle, destructure the soil more than pastures and perennial crops. In this sense, t...

The use of vegetal cover to protect the soil and increase the content of organic matter available to plants is a good alternative to minimize the problems with the loss of soil quality. In this sense, the objective of this work was to evaluate the chemical properties to monitor soil quality in different types of management. The experimental design...

Collection and processing of data on agricultural activity, besides its importance, is still far from reaching full potential. Information Science can contribute developing studies and researches about processes and factors involved in the Data Life Cycle fostering expanded democratization of the use of the data, enabling the mediation access to th...

This paper provides a contribution to the contingency analysis of electric power systems under steady state conditions. An alternative methodology is presented for static contingency analyses that only use continuation methods and thus provides an accurate determination of the loading margin. Rather than starting from the base case operating point,...

The steps involved in the development of two nonlinear predictors for tracing the solution paths of power flow equations are presented in a clear and didactic way. Their performances are compared to those obtained by using the modified zero-order polynomial and the first-order polynomial predictors. Nonlinear predictors are based on the Lagrange in...

RESUMO A necessidade da redução do consumo de água em centros urbanos é de suma importância devido a secas prolongadas. Deste modo, sendo necessário a utilização sustentável e consciente do uso na irrigação de orquidários em centros urbanos. Diante da problemática, o trabalhou objetivou-se realizar a demonstração dos custos e viabilidade da impleme...

This paper presents an efficient geometric parameterization technique for the continuation power flow. It was developed from the observation of the geometrical behavior of load flow solutions. The parameterization technique eliminates the singularity of load flow Jacobian matrix and therefore all the consequent problems of ill-conditioning. This is...

This paper presents efficient geometric parameterization techniques using the tangent and the trivial predictors for the continuation power flow, developed from observation of the trajectories of the load flow solution. The parameterization technique eliminates the Jacobian matrix singularity of load flow, and therefore all the consequent problems...

This paper presents a new parameterization scheme to the continuation power flow that allows the complete tracing of P-V curves and the computation of the maximum loading point of power system, without ill-conditioning problems of the Jacobian matrix and without the exchange of parameter. The objective is to present the technique in a clear and did...

This study presents efficient geometric parameterisation techniques for the continuation power flow. The Jacobian matrix singularity is eliminated by the addition of the line equations which pass through the points in the plane determined by the variables loading factor and the sum of nodal voltage magnitudes, or angles, of all system buses. These...