Marcio Zamboti Fortes

The Induction Motor Parameter Estimation Using Genetic Algorithm

This paper presents a method to estimate electrical parameters in a three-phase induction motor (MIT) equivalent circuit, using genetic algorithm (GA). This method is applied in a MATLAB® Simulink environment. The methodology consist in minimize objective function to represent the estimated current error with GA. The stator current versus slip curve is a simulation result and it will be used to estimate electrical parameters of equivalent circuit. In this work two different theory MIT model are considered Chapman[1] and Wildi [2]. The goal is define the better current versus slip estimate curve for each model and to determine which one has the best motor simulate representation.

Geese: A traffic generator for performance and security evaluation of IEC 61850 networks

Automation systems for substations based on IEC 61850 simplify the design, installation, and maintenance of the system with a significant cost reduction. Indeed, the industry considers safety and reliability of real-time systems an essential factor. In this scenario, GOOSE messages used in IEC 61850 communication networks for protection, control, and automation of substation are very important. This paper addresses the development of a traffic generator to adequately evaluate and test system functionalities according to IEC 61850 traffic model. We design and implement Geese, a GOOSE message generator for performance and reliability of IEC 61850 networks evaluation. Generator results are also presented.

Analysis and suggested solution of Power quality problems in Lighting Laboratory

With the Brazilian market to international industrial products, it is necessary to check the quality conformity of theses products in order to protect the consumer, encouraging continuous quality improvement and promote competition between manufactures [1]. The Compact fluorescent lamps (CFĹs or LFĆs) are one of the several products that the National Institute of metrology, quality and technology (INMETRO) regulates the quality. One of the LFĆs testing stages is to keep the LFĆs supplied with electric power for a time period and after this period switch off the LFĆs in according to a predefined schedule. The construction of the LFĆs supplied circuit is done using semiconductors, and these electronics components can cause an undesirable effect (harmonics) in electrical network. These effects cause a variety of problems in driving, conduction and stabilization laboratory circuits. This paper presents an analysis and suggests a solution to the problem of energy quality in one of the laboratories accredited by INMETRO.

Impact Analysis of Plug-in Electric Vehicle Connected in Real Distribution Network

This work has the objective to analyze a real electric grid behavior after the connection of electric vehicles lead-acid batteries chargers. These chargers have an AC - DC conversion system, considering that the batteries are feeding by direct current. However, due to conversion system switching, harmonics are injected in the process, which may represent a power quality problem, depending on its intensity. The electric grid modeling was developed using the software OpenDSS and the results were analyzed using the software Matlab®, based on the limits established in PRODIST Module 8 and in IEEE Std 519-1992.

Harmonic analysis of distributed generation in Smart City Búzios project

The commercial and industrial sectors have come up against paradigm changes that concern the need for improving their activities, in order to develop processes with less environmental impact, sustainable and energy-efficient, aiming at reducing energy consumption. Technologies based on renewable sources for power generation, such as solar and wind, have emerged as an alternative for these sectors. With the development of distributed generation technologies, such as photovoltaic cells, wind turbines, and so on, it is necessary to identify and classify the disturbances that embedded electronic systems in these technologies may cause on distributed grids. This paper presents some data collected and analyzed on the Smart City Búzios project, where were installed three small wind turbines and solar photovoltaic systems in different grid points. This work presents and discusses some data collected on these systems regarding harmonic analysis. In the remaining of this paper is discussed data related to: vertical wind turbines, photovoltaic system for charging electric vehicles, photovoltaic system feeding computerized command center and photovoltaic system powering LED lamps in public area.

Thermography as a Tool in Electric Panels Maintenance

This paper presents a study to compare gains obtained in hydroelectric generators availability based on thermo vision analysis in electrical panels. Electrical Energy generation companies increase their attention to maintenance costs, specially related with labour costs. A part of maintenance activities demands in industries are related to maintenance of electrical panels. It is important to reduce the execution time of those activities while maintaining the quality of the service. A predictive technique widely used is the thermo vision, that makes use of infrared radiation sensing (heat) emitted by equipments over the absolute temperature. The diagnose obtained is based on the comparison between the radiation intensity from the analyzed equipment and a temperature reference to the same equipment, so verifying the operation conditions compared to standard conditions. This can be of great importance for unplanned corrective actions. Every electrical equipment or system presents heat conditions before a failure. This characteristic can reduce inspections stops or repairs, increasing equipments availability, so reducing costs and increasing the efficiency of the process.

Fault Diagnosis in Transmission Lines: Trends and Main Research Areas

Fault diagnosis in transmission lines constitutes a problem in power systems with relevant technical and economic impact for independent system operators and also for the asset owner itself. Several techniques have been proposed in the literature to deal with this problem in a significant number of applications. This survey presents the main research areas and the trends in transmission line fault diagnosis in power systems. Classification of strategies and their relationship with applications are shown and discussed.

Development of transient fault management methodology

This paper presents the results of development studies to diagnostic and support to locate faults in distribution systems with recognition patterns using neural networks. It presents the developed methodology for input data processing for neural networks, as well as for fault type identification. In this methodology is necessary to get input data and were designed equipment prototypes to measure and transmit datas and voltage transducers. These equipments were installed in two feeders in the concession area of an electrical energy distribution company. The paper conclusion is that all results obtained indicate the suitability of neural networks to support transient fault management.

Power factor metering system using Arduino

The power factor (PF) levels are established by each countrys national standards. In Brazil the lower power factor level allowed is 0.92. In order to monitor this quantity, the present paper uses Arduino to develop a PF metering system. It presents all the necessary theories concerning the calculus of the power factor itself, the programming logic applied to the data acquisition, and the details of the hardware components used in this system. In the end, two tests are conducted so that the meter accuracy can be evaluated. The results are compared with regulated measuring instruments.

Electrical power systems engineering undergraduate courses in Brazil: Academic and market perspectives

The economic growth seen in developing countries enhances a demand for multidisciplinary background of professionals in infrastructure and technology-related areas. The wide range of applications and capacity for abstraction acquired by graduates throughout their Electrical Engineering education distinguishes this particular area of expertise as core factor for workforce qualification. In this context, this paper presents the main results of a nationwide survey performed in order to deliver a current overview of Brazilian Electrical Engineering undergraduate degree programs with concentration in power systems. The academic curricula of the most relevant undergraduate programs in electric power systems in Brazil were analyzed aiming to identify the core contents offered in Brazil. Finally, an online survey was conducted with more than 300 individuals, ranging from recent graduates to senior business managers, hoping to verify the consistency between the education offered by the Academia and the current skill set required by the labor market.