Trabalho de Conclusão de Curso - TCC https://repositorio.ifpe.edu.br/xmlui/handle/123456789/474 2026-04-22T17:12:05Z 2026-04-22T17:12:05Z https://repositorio.ifpe.edu.br/xmlui/handle/123456789/1978 2026-01-30T06:00:48Z 2025-12-19T00:00:00Z

Análise paramêtrica da energização de uma linha de transmissão de 500kV utilizando o software ATPDraw This work analyzes the behavior of transient overvoltages during the energization switching of a 500 kV transmission line (TL) between the Bom Nome II and Campo Formoso II substations, motivated by the expansion of renewable generation and the need to ensure reliability in the Brazilian Interconnected Power System. The objective is to evaluate the influence of the line length and the mitigation of overvoltages at remote terminals through surge arresters, using simulations in the ATP (Alternative Transients Program) software based on a benchmark case validated by the Brazilian Electricity Regulatory Agency (ANEEL). The results show that increasing the line length intensifies overvoltage levels due to wave reflections. It is concluded that the energization of long transmission lines requires special attention, as they produce the highest overvoltages at remote terminals, reinforcing the importance of transient studies to ensure system safety, insulation coordination, and overall reliability. Keywords: Energization, Overvoltages, ATPDraw, Transmission Line.

2025-12-19T00:00:00Z https://repositorio.ifpe.edu.br/xmlui/handle/123456789/1977 2026-01-30T06:00:41Z 2025-12-18T00:00:00Z

Avaliação de sobretensões transitórias em linhas de transmissão com a variação do comprimento da linha utilizando o software ATP This work presents an analysis of the effects of electromagnetic transients in a 500 kV transmission line during the automatic reclosing process, using the Alternative Transient Program (ATP) as the simulation tool. The 500 kV Bom Nome II – Campo Formoso II transmission line was adopted as the study case. This line was part of ANEEL Transmission Auction No. 001/2024, and the ATP base case for Electromagnetic Transient studies for the Basic Design (PB) was made available on the official website. Based on this case, the behavior of transient overvoltages during the three-pole line reclosing maneuver was evaluated by varying the line length. Different line lengths were simulated (50 km, 100 km, 200 km, 300 km, and 373 km). The results showed that increasing the line length leads to higher magnitude and longer duration of overvoltages, due to the greater amount of energy stored in the electric and magnetic fields. It is concluded that a detailed understanding of these parameters is essential for accurately predicting operating conditions and ensuring the reliability of electric power systems.

2025-12-18T00:00:00Z https://repositorio.ifpe.edu.br/xmlui/handle/123456789/1959 2026-01-06T06:01:40Z 2025-12-04T00:00:00Z

Metodologia para automatizar a detecção do efeito borda de nuvem utilizando Python This work provides a comprehensive investigation of the cloud enhancement effect, an atmospheric phenomenon in which solar irradiance exceeds expected values due to the interaction of sunlight with cloud edges, resulting in radiative focusing and an increase in the diffuse component. The study begins with an introduction to solar radiation, highlighting the attenuation of energy from the top of the atmosphere to the surface, as well as the composition of global irradiance into direct and diffuse components. It then discusses the importance of clear-sky models, with emphasis on Gueymard’s method and its contributions to improving irradiance estimates, particularly in studies addressing extreme deviations such as the peaks associated with cloud enhancement. The literature review shows that rapid and intense irradiance fluctuations can compromise the reliability of measurement instruments, affect sensor calibration, influence weather forecasting, and require greater rigor in solarimetric analyses due to the sudden and short-lived nature of these events. Based on these foundations, the present study applies measured data processing to analyze the occurrence of such peaks, identifying characteristic patterns and comparing them with clear-sky reference irradiance limits. Data from the Cedro-PE station (2022) were processed in Python, replacing the manual Excel-based workflow. The implemented algorithm enabled more precise and efficient filtering, grouping, and duration estimation of events. Validation confirmed equivalence with manual results, demonstrating the reliability of the automated approach and its applicability to large- scale solarimetric analyses, reinforcing the relevance of this study for improving solar energy monitoring, diagnostics, and forecasting methods. Keywords: Cloud enhancement. Solar irradiance. Clear-sky model. Gueymard method. Data processing.

2025-12-04T00:00:00Z https://repositorio.ifpe.edu.br/xmlui/handle/123456789/1943 2025-12-19T06:01:22Z 2025-11-06T00:00:00Z

Desenvolvimento,simulação, fabricação e medição de superfícies seletivas em frequência para filtragem de sinais 5g 5G technology represents a significant step in the evolution of wireless communications by enabling high transmission rates. Operating in higher frequency bands, known as millimeter waves, 5G faces additional challenges related to signal propagation, since these waves are susceptible to interference, reflection losses, and absorption in diffe- rent media. In this context, the use of filters becomes essential to ensure signal integrity and the efficient performance of communication systems, acting in the selective rejec- tion or transmission of specific frequency bands and contributing to the improvement of signal quality. The present Undergraduate Thesis aimed to develop, simulate, fabri- cate, and measure two Frequency Selective Surfaces (FSSs), designed to operate as band-stop and band-pass filters at 3.5 GHz, one of the frequency bands allocated for 5G signal operation. The methodology employed was based on bibliographic research and electromagnetic modeling through simulations using the Ansys HFSS software. The ob- tained results showed that the band-stop FSS exhibited satisfactory rejection capability at the 3.5 GHz frequency, proving to be promising for applications in electromagnetic shielding, while the band-pass FSS demonstrated excellent transmission at the same frequency, indicating potential for enhancing the gain of smart antennas. Overall, the simulations and measurements showed agreement with each other, confirming the fe- asibility of the FSSs, reinforcing their applicability in the context of 5G communications, and offering relevant contributions for future research and technological developments.

2025-11-06T00:00:00Z