Uma interface gráfica web para coordenação de relés de sobrecorrente usando Python e Plotly

Abstract

The planning of the electrical system aims to provide quality electrical energy. However, the system may be exposed to topological contingencies, discharges and equipment failures such as generators, motors and transformers. The search for the best results in relation to the protection of the power system is important and many must be improving themselves to reach this objective. Therefore, this monograph has as main objective to develop a computational tool for the coordination of overcurrent relays in order to reduce operation failures and guarantee a more reliable electrical power system. The work was developed in the Python language, which is easy to understand and has a relatively simple syntax. It has been used in numerous scientific researches, since there are many libraries for processing, mathematical analysis and data. The main library for this work is pandapower (http://www.pandapower.org/), developed by German researchers from the University of Kassel, to calculate power flow and short circuit with a high degree of automation. Its electrical modeling allows including lines, ZIP-loads, switches, shunts and transformers, being relatively fast. Pandapower is installed within the Integrated Development Environment, without the need to use any plugin or DLL files. For this work, the relay coordination problem was treated as an optimization problem, using the Pyomo library. This library allows you to use several well-known solvers such as GLPK, CBC and Gurobi. For the web development of the interface, the two most advanced data visualization libraries in Python were used: Plotly and Dash. The first in the presentation of interactive graphics and the second in the layout of the interface. Finally, the results were very reduced considering that it can calculate and determine the relay sensing current in different situations.