Uma abordagem para predição da estabilidade transitória em sistemas elétricos de potência a partir de redes neurais artificiais

• Ano de defesa: 2022
• Autor(a) principal: Mancini, Gabriel
• Orientador(a): Fernandes, Tatiane Cristina da Costa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos; Câmpus São Carlos
• Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia Elétrica - PPGEE
• Palavras-chave em Português: Redes neurais artificias; Sincrofasores; Técnicas de aprendizagem de máquina; Previsão da estabilidade transitória
• Palavras-chave em Inglês: Prediction of transient stability; Artificial neural networks; Synchrophasors; Machine learning techniques
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA ELETRICA::SISTEMAS ELETRICOS DE POTENCIA
• Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/17276

In an electrical network, the assessment and prediction of dynamic safety are essential to avoid interruptions in the supply of electrical energy to consumers, in addition to ensuring that the system operates reliably. Regarding the transient security assessment, predicting the behavior of the electrical power system in the post-fault period within a short time interval is essential so that preventive and, if necessary, corrective actions are taken. Traditionally, in the planning and operation of an electrical network, this study can be developed through the numerical solution of nonlinear differential equations, however, the accuracy of this analysis is limited by the capacity of representation of the model and the need for its constant updating. Considering the operation of power systems nowadays, with a continuous increase in load demand as well as the participation of energy generation sources with intermittent characteristics, this task has become increasingly challenging, increasing the degree of complexity of the mathematical model. On the other hand, the improvement of phasor measurement systems boosts the use of machine learning techniques to predict the status of the transient stability of an electrical network, among which neural networks have stood out. In view of this, the present work aims to investigate the use of artificial neural networks to predict transient stability in an electrical power system through measurements that can be easily measured by phasor measurement units, such as magnitude and voltage angle of the buses. In the proposed structure, the smallest number of measurement cycles necessary to perform the prediction is investigated, so that the behavior of the system (stable or unstable) is identified in the shortest possible time, helping the operator to make a decision. The results obtained in the IEEE 68 bus system show the efficiency of the predictor, which obtained an accuracy of 97.5% in the classification from 6 consecutive cycles of measuring the system response. When only 1 measurement cycle was provided to the predictor, a high accuracy is also achieved 96.1 % by the proposed methodology.