16 results on '"Sant'Ana, Wilson Cesar"'
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2. Early detection of insulation failures on electric generators through online Frequency Response Analysis
- Author
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Sant’Ana, Wilson Cesar, Salomon, Camila Paes, Lambert-Torres, Germano, Borges da Silva, Luiz Eduardo, Bonaldi, Erik Leandro, de Lacerda de Oliveira, Levy Ely, and Borges da Silva, Jonas Guedes
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- 2016
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3. A survey on statistical indexes applied on frequency response analysis of electric machinery and a trend based approach for more reliable results
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Sant’Ana, Wilson Cesar, Salomon, Camila Paes, Lambert-Torres, Germano, Borges da Silva, Luiz Eduardo, Bonaldi, Erik Leandro, de Lacerda de Oliveira, Levy Ely, and Borges da Silva, Jonas Guedes
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- 2016
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4. Influence of rotor position on the repeatability of frequency response analysis measurements on rotating machines and a statistical approach for more meaningful diagnostics
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Sant’Ana, Wilson Cesar, Lambert-Torres, Germano, Borges da Silva, Luiz Eduardo, Bonaldi, Erik Leandro, de Lacerda de Oliveira, Levy Ely, Salomon, Camila Paes, and Borges da Silva, Jonas Guedes
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- 2016
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5. Detection of Failures in Metal Oxide Surge Arresters Using Frequency Response Analysis.
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Zacarias, Tiago Goncalves, Martins, Rafael, Xavier, Carlos Eduardo, Castioni, Julio Cezar Oliveira, Sant'Ana, Wilson Cesar, Lambert-Torres, Germano, Gama, Bruno Reno, Areias, Isac Antonio dos Santos, Bonaldi, Erik Leandro, and Assuncao, Frederico De Oliveira
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METALLIC oxides ,METAL fractures ,METAL detectors ,ENERGY dissipation ,STRAY currents ,POWER transformers - Abstract
This work presents an innovative application of Frequency Response Analysis (FRA) in order to detect early degradation of Metal Oxide Surge Arresters (MOSAs). This technique has been widely used in power transformers, but has never been applied to MOSAs. It consists in comparisons of spectra, measured at different instants of the lifetime of the arrester. Differences between these spectra are an indicator that some electrical properties of the arrester have changed. An incremental deterioration test has been performed on arrester samples (with controlled circulation of leakage current, which increases the energy dissipation over the device), and the FRA spectra correctly identified the progression of damage. Although preliminary, the FRA results seemed promising, and it is expected that this technology could be used as another diagnostic tool for arresters. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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6. Proposal of a System to Identify Failures and Evaluate the Efficiency of Internal Combustion Engines of Thermal Power Plants.
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Ramos, Lilia Carneiro, Assuncao, Frederico de Oliveira, Villa-Nova, Helcio Francisco, Lambert-Torres, Germano, Bonaldi, Erik Leandro, Oliveira, Levy Ely de Lacerda de, Sant'Ana, Wilson Cesar, Junior, Ronny Francis Ribeiro, Teixeira, Carlos Eduardo, and Medeiros, Paulo Germano Pinto de
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SYSTEM failures ,COMBUSTION efficiency ,STEAM power plants ,POWER plants ,ENGINE cylinders ,ONLINE monitoring systems ,INTERNAL combustion engines ,DIESEL motors - Abstract
Thermoelectric plants are one of the main forms of energy generation in the world, being the second main source of generation in Brazil. However, with rising fuel costs and greater concern for the environment, controlling the efficiency levels of these plants has become critical. This work presents a system to identify failures and evaluate the efficiency of internal combustion engines used in thermal power plants. To assess efficiency, the developed system monitors subsystem losses (such as cooling, lubrication, turbocharger, etc.). In addition, sensors for cylinder pressure and instantaneous speed were installed and comprise an online monitoring system for the pressure condition of each cylinder of the engines. All this is combined into a supervisory system that presents the Sankey diagram of the engine as its main information online and remotely. To validate the system, experiments were carried out in a controlled configuration (where faults were purposely inserted) and in a Brazilian thermal power plant. The results show that by using in-cylinder pressure and the WOIS database, it was possible to detect the presence of a fault as well as pinpoint its location. [ABSTRACT FROM AUTHOR]
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- 2022
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7. Power Flow Control Using Series Voltage Source Converters in Distribution Grids.
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Pinheiro, Guilherme Gonçalves, da Silva, Carlos Henrique, Guimarães, Bruno P. B., Gonzatti, Robson Bauwelz, Pereira, Rondineli Rodrigues, Sant'Ana, Wilson Cesar, Lambert-Torres, Germano, and Santana-Filho, Joselino
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VOLTAGE-frequency converters ,ELECTRICAL load ,FLEXIBLE AC transmission systems ,IDEAL sources (Electric circuits) ,ELECTRIC power distribution grids - Abstract
This study presents an application for a series VSC (voltage source converter) in distribution grids for power flow management. Series devices have been widely studied for FACTS (flexible AC transmission systems), however, more recently these devices have gained increased interest in applications for loading balance in medium voltage distribution grids. As the number of distributed generation (DG) units increases, increasing the capacity and reliability of distribution grids while maximizing the benefits of installed DGs and loading behavior is an ever more important task. In this paper, we describe a test system and control proposals for a practical application of series converters interconnecting two distribution feeders at 13.8 kV under load variation disturbances. This approach provides solutions when installed at the end of distribution lines by interconnecting two feeders, resulting in capacity increases in the feeders without needing grid reconfigurations using a small-rated series VSC. [ABSTRACT FROM AUTHOR]
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- 2022
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8. Technical and Economic Analysis of the Implementation of a Self-Sustainable Briquetting Process for Electric Generation.
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Martins, Rosa, Cardenas-Rodriguez, Haylemar de Nazaret, Oliveira, Levy Ely Lacerda, Bonaldi, Erik Leandro, Assuncao, Frederico de Oliveira, Lambert-Torres, Germano, Villa-Nova, Helcio Francisco, Sant'Ana, Wilson Cesar, Borges-da-Silva, Luiz Eduardo, Bomfin, Clodoaldo Barboza, Haddad, Jamil, and Santos, Afonso Henriques Moreira
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BRIQUETS ,WOOD waste ,INTERNAL rate of return ,NET present value ,WOOD ,PLANT indicators ,SELF-efficacy - Abstract
The wood industry is an essential part of the economy of some regions in Brazil. Although the excess of wood residue is an environmental concern, it is also an alternative source for electricity generation. This allows for compliance with current legislation to minimize environmental impacts such as strategies to control the emission of pollutants and the decarbonization in the wood exploration activity. Despite this, the thermoelectric plants based on wood residues face problems associated with the low efficiency in generation due to the high moisture content of the residues, and challenges related to transport and storage. In this sense, this work is to evaluate the application of a self-sustainable briquetting plant as an alternative for solving the problems associated with the high moisture content, transport, and storage of wood residues. The aspects related to the construction of the briquetting plant and economic indicators associated with the economic feasibility, such as, the estimation of the net present value over the project lifecycle, internal rate of return and pay-back period, are also presented and discussed. The results demonstrated the feasibility of the plant mainly due to the better energy/volume ratio of the briquette (drying and compaction) and the transportation cost savings associated to the density of the compacted material. [ABSTRACT FROM AUTHOR]
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- 2022
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9. Online Frequency Response Analysis of Electric Machinery through an Active Coupling System Based on Power Electronics.
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Sant'Ana, Wilson Cesar, Lambert-Torres, Germano, Bonaldi, Erik Leandro, Gama, Bruno Reno, Zacarias, Tiago Goncalves, Areias, Isac Antonio dos Santos, Arantes, Daniel de Almeida, Assuncao, Frederico de Oliveira, Campos, Mateus Mendes, and Steiner, Fabio Monteiro
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ELECTRIC machinery , *POWER electronics , *FREQUENCY response , *CONVERTERS (Electronics) , *LOW voltage systems - Abstract
This paper presents an innovative concept for the online application of Frequency Response Analysis (FRA). FRA is a well known technique that is applied to detect damage in electric machinery. As an offline technique, the machine under testing has to be removed from service—which may cause loss of production. Experimental adaptations of FRA to online operation are usually based on the use of passive high pass coupling—which, ideally, should provide attenuation to the grid voltage, and at the same time, allow the high frequency FRA signals to be injected at the machine. In practice, however, the passive coupling results in a trade-off between the required attenuation and the useful area obtained at the FRA spectra. This paper proposes the use of an active coupling system, based on power electronics, in order to cancel the grid voltage at the terminals of FRA equipment and allow its safe connection to an energized machine. The paper presents the basic concepts of FRA and the issue of online measurements. It also presents basic concepts about power electronics converters and the operating principles of the Modular Multilevel Converter, which enables the generation of an output voltage with low THD, which is important for tracking the grid voltage with minimum error. [ABSTRACT FROM AUTHOR]
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- 2021
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10. An Ultrasonic-Capacitive System for Online Characterization of Fuel Oils in Thermal Power Plants.
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Campos, Mateus Mendes, Borges-da-Silva, Luiz Eduardo, Arantes, Daniel de Almeida, Teixeira, Carlos Eduardo, Bonaldi, Erik Leandro, Lambert-Torres, Germano, Ribeiro Junior, Ronny Francis, Krupa, Gabriel Pedro, Sant'Ana, Wilson Cesar, Oliveira, Levy Ely Lacerda, and de Paiva, Renato Guth
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PETROLEUM as fuel ,POWER plants ,FUEL quality ,MASS transfer ,OIL transfer operations ,DEIONIZATION of water ,WATER pipelines - Abstract
This paper presents a ultrasonic-capacitive system for online analysis of the quality of fuel oils (FO), which are widely used to produce electric energy in Thermal Power Plants (TPP) due to their elevated heating value. The heating value, in turn, is linked to the quality of the fuel (i.e., the density and the amount of contaminants, such as water). Therefore, the analysis of the quality is of great importance for TPPs, either in order to avoid a decrease in generated power or in order to avoid damage to the TPP equipment. The proposed system is composed of two main strategies: a capacitive system (in order to estimate the water content in the fuel) and an ultrasonic system (in order to estimate the density). The conjunction of the two strategies is used in order to estimate the heating value of the fuel, online, as it passes through the pipeline and is an important tool for the TPP in order to detect counterfeit fuel. In addition, the ultrasonic system allows the estimation of the flow rate through the pipeline, hence estimating the amount of oil transferred and obtaining the total mass transferred as a feature of the system. Experimental results are provided for both sensors installed in a TPP in Brazil. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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11. Analysis on the Use of Briquettes as an Alternative to Improve the Generation of Thermal Energy in the Locality of Aripuana-Brazil.
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Cardenas-Rodriguez, Haylemar de Nazaret, Martins, Rosa, Oliveira, Levy Ely Lacerda, Bonaldi, Erik Leandro, Assuncao, Frederico de Oliveira, Lambert-Torres, Germano, Villa-Nova, Helcio Francisco, Sant'Ana, Wilson Cesar, Borges-da-Silva, Luiz Eduardo, Bomfin, Clodoaldo Barboza, and Haddad, Jamil
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BRIQUETS ,WOOD waste ,RAW materials ,ELECTRIC power production ,ENERGY consumption ,PLANT performance - Abstract
The city of Aripuana is one of the largest wood producer in the state of Mato Grosso, Brazil. Wood residues are used in the electricity generation at three thermoelectric plants in this region. However, the plants have high costs in transporting the wood residues (due to poor road conditions). Hence, this paper compares the energy performance of wood residues in natura and compacted as briquettes by calculating the heating value and determining the influence of moisture content on the energy characteristics of wood residues. The goal is to demonstrate the viability of using briquettes in order to improve thermoelectric generation. The wood residues from this region are affected by the high humidity of the biome. An alternative to improve the use of energy contained in the wood residues is to produce briquettes with lower humidity. This allows one to maintain high levels of heat energy in a lower volume, facilitating handling and storage. The results show that the use of briquettes improved the performance of thermoelectric plants, generating 1 MW of electricity power with less than 1 ton of briquettes. This contributes to the preservation of the environment, reducing operating costs, transportation and storage of the raw materials. [ABSTRACT FROM AUTHOR]
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- 2021
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12. Reduced Scale Laboratory for Training and Research in Condition-Based Maintenance Strategies for Combustion Engine Power Plants and a Novel Method for Monitoring of Inlet and Exhaust Valves.
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Assuncao, Frederico de Oliveira, Borges-da-Silva, Luiz Eduardo, Villa-Nova, Helcio Francisco, Bonaldi, Erik Leandro, Oliveira, Levy Ely Lacerda, Lambert-Torres, Germano, Teixeira, Carlos Eduardo, Sant'Ana, Wilson Cesar, Lacerda, Josue, da Silva Junior, Jose Luiz Marques, and da Silva, Edenio Gomes
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CONDITION-based maintenance ,INLET valves ,POWER plants ,INTERNAL combustion engines ,COMBUSTION - Abstract
This paper presents the practical aspects of development of a reduced scale laboratory and a set of monitoring tools for Internal Combustion Engines used in Thermal Power Plants. The reduced scale laboratory is based on the necessity of researchers to test new sensors and monitoring strategies that, otherwise, are seldom allowed to be installed in real plants without certification. In addition, the reduced scale laboratory allows the flexibility to insert failures on purpose, in order to evaluate the performance of new sensors/strategies in a safe and controlled environment. The paper also presents the development of a set of reduced cost sensors for monitoring in-cylinder pressure, crank angle, and the position of inlet and exhaust valves (without using ultrasound sensors, which may produce noisy readings on engines operating on gas-diesel fuel mode). [ABSTRACT FROM AUTHOR]
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- 2021
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13. Condition Monitoring of Internal Combustion Engines in Thermal Power Plants Based on Control Charts and Adapted Nelson Rules.
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Vilas Boas, Fernanda Mitchelly, Borges-da-Silva, Luiz Eduardo, Villa-Nova, Helcio Francisco, Bonaldi, Erik Leandro, Oliveira, Levy Ely Lacerda, Lambert-Torres, Germano, Assuncao, Frederico de Oliveira, Costa, Claudio Inacio de Almeida, Campos, Mateus Mendes, Sant'Ana, Wilson Cesar, Lacerda, Josue, da Silva Junior, Jose Luiz Marques, and da Silva, Edenio Gomes
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INTERNAL combustion engines ,QUALITY control charts ,STATISTICAL process control ,POWER plants ,STEAM power plants ,DATABASES ,PLANT maintenance - Abstract
In thermal power plants, the internal combustion engines are constantly subjected to stresses, requiring a continuous monitoring system in order to check their operating conditions. However, most of the time, these monitoring systems only indicate if the monitored parameters are in nonconformity close to the occurrence of a catastrophic failure—they do not allow a predictive analysis of the operating conditions of the machine. In this paper, a statistical model, based on the statistical control process and Nelson Rules, is proposed to analyze the operational conditions of the machine based on the supervisory system data. The statistical model is validated through comparisons with entries of the plant logbook. It is demonstrated that the results obtained with the proposed statistical model match perfectly with the entries of the logbook, showing our model to be a promising tool for making decisions concerning maintenance in the plant. [ABSTRACT FROM AUTHOR]
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- 2021
- Full Text
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14. Development and 24 Hour Behavior Analysis of a Peak-Shaving Equipment with Battery Storage.
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Sant'Ana, Wilson Cesar, Gonzatti, Robson Bauwelz, Lambert-Torres, Germano, Bonaldi, Erik Leandro, Torres, Bruno Silva, de Oliveira, Pedro Andrade, Pereira, Rondineli Rodrigues, Borges-da-Silva, Luiz Eduardo, Mollica, Denis, and Santana Filho, Joselino
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STORAGE batteries , *DIGITAL signal processing , *GLOBAL Positioning System , *DC-to-DC converters - Abstract
This paper presents the development of a peak-shaving equipment, composed by a multilevel converter in a cascaded H-bridge topology and battery banks on the DC links. Between specific time periods, when the demand is higher, the equipment injects active power from the batteries into the grid to provide support to the system. During the other times of the day, when the demand is lower, the converter charges its battery banks with the exceeding (and low producing cost) energy from the grid. The charge and discharge control algorithms are implemented in a digital signal processor (DSP). The precise time of the day information is obtained from a real-time-clock from a global positioning system module (GPS), which communicates with the DSP through the serial interface. This paper presents the control algorithms and experimental results obtained in a 24 h continuous operation of the equipment. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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15. A Study of Fault Diagnosis Based on Electrical Signature Analysis for Synchronous Generators Predictive Maintenance in Bulk Electric Systems.
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Salomon, Camila Paes, Ferreira, Claudio, Sant'Ana, Wilson Cesar, Lambert-Torres, Germano, Borges da Silva, Luiz Eduardo, Bonaldi, Erik Leandro, de Oliveira, Levy Ely de Lacerda, and Torres, Bruno Silva
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SYNCHRONOUS generators ,HYDROELECTRIC power plants ,FAULT diagnosis ,ELECTRIC machinery ,STATORS - Abstract
The condition of synchronous generators (SGs) is a matter of great attention, because they can be seen as equipment and also as fundamental elements of power systems. Thus, there is a growing interest in new technologies to improve SG protection and maintenance schemes. In this context, electrical signature analysis (ESA) is a non-invasive technique that has been increasingly applied to the predictive maintenance of rotating electrical machines. However, in general, the works applying ESA to SGs are focused on isolated machines. Thus, this paper presents a study on the condition monitoring of SGs in bulk electric systems by using ESA. The main contribution of this work is the practical results of ESA for fault detection in in-service SGs interconnected to a power system. Two types of faults were detected in an SG at a Brazilian hydroelectric power plant by using ESA, including stator electrical unbalance and mechanical misalignment. This paper also addresses peculiarities in the ESA of wound rotor SGs, including recommendations for signal analysis, how to discriminate rotor faults on fault patterns, and the particularities of two-pole SGs. [ABSTRACT FROM AUTHOR]
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- 2019
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16. Comparison among Methods for Induction Motor Low-Intrusive Efficiency Evaluation Including a New AGT Approach with a Modified Stator Resistance.
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Salomon, Camila Paes, Sant’Ana, Wilson Cesar, Lambert-Torres, Germano, Borges da Silva, Luiz Eduardo, Bonaldi, Erik Leandro, and de Oliveira, Levy Ely de Lacerda
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INDUCTION motors , *STATORS , *TORQUE , *BRUSHLESS electric motors , *KINEMATICS - Abstract
Induction motors consume a great portion of the generated electrical energy. Moreover, most of them work at underloaded conditions, so they have low efficiencies and waste a lot of energy. Because of this, the efficiency estimation of in-service induction motors is a matter of great importance. This efficiency estimation is usually performed through indirect methods, which do not require invasive measurements of torque or speed. One of these methods is the modified Air-Gap Torque (AGT) method, which only requires voltage and current data, the stator resistance value, and the mechanical losses. This paper approaches the computation of a modified stator resistance including the mechanical losses effect to be applied in the AGT method for torque and efficiency estimation of induction motors. Some improvements are proposed in the computation of this resistance by using a direct method, as well as the possibility to estimate this parameter directly from the nameplate data of the induction motor. The proposed methodology only relies on line voltages, currents, and nameplate data and is not intrusive. The proposed methodology is analyzed through simulation and validated through experimental results with three-phase induction motors. Also, a comparison of methods for in-service induction motors efficiency estimation is presented for the tested motors. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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