Determinação de região de segurança de tensão para o subsistema SS1 do sistema interligado nacional do Paraguai

• Autor(a) principal: Nespolo, João Pedro de Araujo
• Data de Publicação: 2021
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UTFPR (da Universidade Tecnológica Federal do Paraná (RIUT))
• Texto Completo: http://repositorio.utfpr.edu.br/jspui/handle/1/32759
• topic: Colapso (Eletricidade); Sistemas de energia elétrica - Estabilidade; Medidores de tensão; Breakdown (Electricity); Electric power system stability; Strain gages; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA

The National Interconnected System of Paraguay is composed of two electrically isolated subsystems, the subsystem SS1 and the subsystem SS2, both operated by Administración Nacional de Eletricidad (ANDE). The demand for electricity in Paraguay has shown one of the highest growth rates in Latin America in recent years, which often leads the system to operate close to its maximum transmission capacity. In this scenario, considering the radial characteristics of the subsystem SS1, an eventual disconnection of the main transmission lines can lead this subsystem to degraded operating conditions, especially with regard to the voltage on the buses close to the main load center of Paraguay, if not to voltage instability itself. In this context, understanding the voltage stability limits of the subsystem SS1, under normal conditions and under contingency of the main transmission lines, is essential to support safe operation and promote the best use of the available infrastructure. Thus, in this work, a voltage security region was determined for the subsystem SS1 of the National Interconnected System of Paraguay in the (P,Q) plane, in order to establish a practical and direct visualization of the unsafe operating conditions. A methodology based on the construction of PQ curves for different operative scenarios was proposed, with the adoption of the Area of Voltage Stability Region index for the classification of disturbances and determination of the safe operation points. The contingencies of the main transmission lines of the Subsystem SS1 were evaluated, at light, medium, heavy and maximum load levels, and the computational implementation was carried out through programming in Python, with integration of analysis and data visualization tools. The proposed operating limits were validated through dynamic simulations, however, the voltage safety region obtained proved to be conservative due to the process adopted to calculate the Voltage Stability Margin.