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Grant number: 15/13823-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): January 01, 2016
Effective date (End): April 30, 2019
Field of knowledge:Engineering - Electrical Engineering - Power Systems
Principal researcher:Maria Cristina Dias Tavares
Grantee:Javier Arturo Santiago Ortega
Home Institution: Faculdade de Engenharia Elétrica e de Computação (FEEC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


The research project focus on the analysis of very long transmission lines with properties of a little more than half a wavelength (HWL) as an option to current and conventional technologies in Alternating Current (HVAC) and Direct Current (HVDC) to transmission of large blocks of energy over very long distances.HWL technology presents advantageous properties from steady state operating point of view, also presents levels of transient overvoltages which by their nature are smaller than HVAC lines of conventional length and costs near 25% less than equivalent HVDC line. However, in accordance with the existing literature, this technology presents some situations that need specific solution, as high overvoltages levels when faults or short circuits are presented in specific critical transmission line positions.In the proposed project the faults along a transmission line with HWL properties will be studied, analyzing and explaining the mechanism by which these overvoltages occur and proposing a mitigation methodology. These new procedures will be analyzed together with the protection systems in order to provide a reliable operation to electrical system. The main methods to be analyzed are the use of techniques such as reducing the insulation distance, controlling the reactive power, the displacement of the resonance point during faults and others methods that may be identified during the research.The analysis and simulations will be performed with the PSCAD / EMTDC program (simulation tool for transient phenomena in electric power systems) and MATLAB. Specific situations can be analyzed from digital simulations in real time using the RTDS " (Real Time Digital Simulator). This equipment allows the evaluation of the interaction between protection and control elements with the electrical system response, which is called equipment for simulation in closed loop ("hardware in the loop").

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ORTEGA, JAVIER SANTIAGO; TAVARES, MARIA CRISTINA. Transient Analysis and Mitigation of Resonant Faults on Half-Wavelength Transmission Lines. IEEE Transactions on Power Delivery, v. 35, n. 2, p. 1028-1037, . (15/13823-0, 17/20010-1)
SANTIAGO, JAVIER; TAVARES, MARIA CRISTINA. Relevant factors for temporary overvoltages due to fault-resonance conditions on half-wavelength transmission lines. Electric Power Systems Research, v. 175, . (15/13823-0, 17/20010-1)
ORTEGA, JAVIER SANTIAGO; TAVARES, MARIA CRISTINA. New perspectives about AC link based on half-wavelength properties for bulk power transmission with flexible distance. IET GENERATION TRANSMISSION & DISTRIBUTION, v. 12, n. 12, p. 3005-3012, . (15/05626-0, 15/13823-0)
SANTIAGO, JAVIER; TAVARES, MARIA CRISTINA. Analysis of half-wavelength transmission line under critical balanced faults: Voltage response and overvoltage mitigation procedure. Electric Power Systems Research, v. 166, p. 99-111, . (15/13823-0, 17/20010-1)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ORTEGA, Javier Arturo Santiago. Analysis of half-wavelength transmission line behavior during fault occurrence and proposal of overvoltage mitigation technique. 2019. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação Campinas, SP.

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