Análise de atuação indevida do ERAC em desenergização de subestação, influenciada pela desaceleração de motores e proposta de lógica utilizando a função ANSI 81U com dois estágios de tensão de bloqueio e temporização

Detalhes bibliográficos
Ano de defesa: 2020
Autor(a) principal: Borges, Adriano
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
Brasil
Engenharia Elétrica
UFSM
Programa de Pós-Graduação em Engenharia Elétrica
Centro de Tecnologia
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
SIN
Link de acesso: http://repositorio.ufsm.br/handle/1/22627
Resumo: The stability of the SEP is a major concern for System Operators worldwide. Several actions and controls are taken when a major disturbance occurs, with the aim of finding a new balance point, minimizing the disconnection of loads and avoiding generalized blackouts. One of the most important controls is the Under Frequency Load Shedding (UFLS), in Brazil called the Regional Load Relief Scheme (ERAC). This function has already avoided several blackouts with selective load cuts by underfrequency, bringing the system to the load-generation balance. ERAC’s performance is important for the stability of the National Interconnected System (SIN), however, the improper performance of this function generates problems for concessionaires, such as customer dissatisfaction and fines imposed by the National Electric Energy Agency - ANEEL. Following this reasoning, this paper analyzes the reliability of the ERAC system in SIN disturbances and some undue actions, influenced by the deceleration of induction motors. Then, the characteristic of the voltage wave that arises due to the influence of the motors is analyzed, with the aid of the DIgSILENT software, as well as which are the ideal settings for commercial underfrequency relays in the South region. This analysis was aided by the ANATEM software, by oscillographic records of actual actions by the SIN and undue actions by the RGE concessionaire underfrequency relays. Finally, a new ERAC schemes is proposed, obtained from two settings for the blocking voltage. As result, there is the blocking of the ANSI 81U function during engine the deceleration and the guarantee of the correct performance of the ERAC when it is requested.