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Navegando EMC - Trabalhos de Conclusão de Curso por Autor "Almeida, Maria Leonor Silva de"
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Item Avaliação do curto - circuito com outfeed em linhas de transmissão com compensação série(Universidade Federal de Goiás, 2019-07-11) Marçal, Valentina de Paula; Almeida, Maria Leonor Silva de; Almeida, Maria Leonor Silva de; Garces Negrete, Lina Paola; Oliveira, Renata Isabella Pinheiro deThe use of series compensation in transmission lines is advantageous as it increases the power transmitted by this equipment. Nevertheless, the use of capacitor banks in series to lines raises the complexity of the protection of these equipments. Among the phenomena that can compromise the correct performance of line protection, it’s mentioned fault situation with outfeed, in which currents directions in the transmission line remain the same as the nominal operating condition, despite having an internal fault occurred. As both the use of capacitor banks in series and the protection employed in these banks contribute to the incidence of faults with outfeed, this work aims to evaluate the occurrence of this phenomenon in series compensated transmission line. For that, a 500 kV and 400 km transmission line with series compensation was modeled, through the Alternative Transient Program (ATP) software, which was submitted to different types of internal faults. Based on the obtained results, parametric sensitivity analyzes, throught the Octave software, were carried out to verify how system load, type of fault, resistance and fault location contribute to the existence of faults with outfeed.Item Desempenho da função de sobrecorrente aplicada à proteção de linhas de transmissão: avaliação de falha de seletividade(Universidade Federal de Goiás, 2021-01-18) Labre, João Victor Moraes; Paula, Matheus Vicente de; Kopcak, Igor; Kopcak, Igor; Garces Negrete, Lina Paola; Almeida, Maria Leonor Silva de; Brigatto, Gelson AndrêaThe protection of Electrical Power Systems has relays as main components. When there is a defect or disturbance in the system, the relays must be sensitized and, in a coordinated action, they act by isolating the defect by disconnecting the smallest possible portion of the system. This paper aims to analyze the performance of the phase overcurrent and neutral function (ANSI 51 / 51N), in order to check possible situations of improper performance, especially regarding the loss of selectivity. For this purpose, several simulations of fault conditions were applied in a system consisting of two parallel transmission lines, disregarding the magnetic coupling, at a voltage of 230 kV, based on a real system. All modeling was performed in the ATP environment. The following faults were simulated: single-phase, two-phase, twophase-ground, and three-phase. The faults were applied along the entire length of the transmission lines, at intervals of 10% of their length, maintaining a healthy circuit and a defective one. Faults with 0.1 Ω and 40 Ω fault resistance were considered. The results were analyzed according to the TRIP signals of each relay after the fault was applied. It was found that the overcurrent function is insufficient for satisfactory protection of the analyzed system, with regard to the selectivity of defect elimination, considering that situations were observed in which there would be the opening of at least one of the sides of the healthy line. On the other hand, it was observed that the neutral overcurrent function contributes to increase the sensitivity of the protection system, facilitating the adjustment of the phase overcurrent protection, complementing it.Item Formulação retangular do método de Newton-Raphson com modelo de carga ZIP(Universidade Federal de Goiás, 2020-08-21) Sifuentes Filho, Daniel Pedrosa; Brigatto, Gelson Andreâ; Brigatto, Gelson Andreâ; Almeida, Maria Leonor Silva de; Garces Negrete, Lina Paola; Kopcak, IgorItem Modelagem e estudo das funções de proteção exigidas para conexão de geração distribuída à rede elétrica, utilizando o Alternative Transient Program(Universidade Federal de Goiás, 2023-02-24) Martins, Juan Fábio Soares; Araújo, Marcos Paulo de Carvalho; Kopcak, Igor; Kopcak, Igor; Almeida, Maria Leonor Silva de; Mota, Igor LopesThis work presents the implementation of a library of protection function models, essentials for the connection of distributed generation systems to the electrical network. The protection functions required by the PRODIST Module 3 - Connection to the Electrical Distribution System and additional functions necessary for connection with the Equatorial Energia concessionaire were implemented in the ATPDraw software, according to NT 021 – Connection of Distributed Small Generation to the Distribution System. Protection functions against overcurrent (ANSI 50/51), overcurrent with voltage restraint (ANSI 51V), neutral overcurrent (ANSI 50/51N), current imbalance (ANSI 46), directional overcurrent (ANSI 67), under/overvoltage (ANSI 27/59), neutral overvoltage (ANSI 59N), voltage imbalance (47), under and overfrequency (ANSI 81 O/U), active power directional (ANSI 32P), vector surge (ANSI 78), and frequency rate of change (ROCOF) are covered. The Directional Reactive Power (ANSI 32Q) function was also studied as a protection against unintentional islanding of the distributed generator, verifying the detection capability for systems with inductive and non-unity power factor loads, being an effective complement to the other islanding functions. To evaluate the performance of the protection system, the distribution network was modeled, including the synchronous generator, and faults were applied, such as internal and external short circuits, imbalances, load rejections and islanding.Item Vendedor virtual com PLN, machine learning e grafos de conhecimento(Universidade Federal de Goiás, 2021-06-02) Souza, Luiz Yokoyama Felix de; Dias, Elisângela Silva; Dias, Elisângela Silva; Almeida, Maria Leonor Silva de; Silva, Nádia Félix Felipe daThe information age, provided by the internet, is revolutionizing the ways in which services are offered. In this scenario, chatbots, automated response programs in dialog interfaces, are on the rise. However, it usually only have pre-programmed responses and the most common options, which can cause discontent in the user. The objective of this work is a research applied to the design of a chatbot model, with artificial intelligence, capable of interacting in the user’s natural language, emitting responses like those of a human within his area of activity, which, in this case, is the sales area. Thus, a chatbot model was developed and evaluated using the Rasa framework, based on new methods for obtaining artificial intelligence training data. A Knowledge Graph model has also been developed that can provide more quality to the service provided, offering products and understanding details, including the misspellings of messages.