Geração de manobras finais de recomposição de subestações do sistema elétrico.

Abstract

In the context of the Companhia Hidro Elétrica do São Francisco (CHESF), power system restoration is subject to failures by virtue of mis interpretation,during real-time execution,of the OIs (Operation Instructions). An OI is a normative document that describes the power restoration plan of a electrical substation; OIs are complex documents, characterized by the use of natural language and poor structure, thus the text may contain ambiguities and the probability of misinterpretation is higher. Misinterpreting OI instructions during execution can severely harm the electrical grid, which tends to slow down the restorationprocess. The delay in this activity may cause enormous damage to the society and financial losses to the company, due to power supply interruption. Concerning this problem, this work presents an innovative approach to reduce operational errors when restoring the system. Our solution consists of three fundamental steps: (i) power restoration plans are structured through a high-level language created to serve this purpose; (ii) we translate these structured plans into switching sequences, composed of atomic commands and (iii) we export these final switching sequences to another existing tool, responsible for managing the execution of OIs in real time and auditing them by accessing the company’s SCADA system. The research was validated in partner ship with CHESF’s power system restoration specialists. Altogether, six CHESF’s operating OIs were converted to this approach, aiming to verify its correctness. Besides that, we presented the solution model to two engineers of the company, which analyzed and approved the proposed solution. As main advantages of the technique pointed out bythe specialists,standout: (i) itlowers themaintenance effortofthe power restoration plans; (ii) it decreases the number of technical errors and typographical errors on the power restoration plan generation and interpretation; (iii) it introduces auditing in the execution flow of the power restoration switching sequences, which partially automates the task and eliminates the need of real-time analysis by the operators.