Compensação dinâmica de potência não ativa em média tensão

• Ano de defesa: 2017
• Autor(a) principal: Lima, Rodrigo Nobis da Costa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Engenharia Elétrica
• Palavras-chave em Português: Compensador dinâmico de reativo; Fator de potência; Filtro harmônico; Power factor; Dynamic reactive compensator; Harmonic filter; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/19930; http://dx.doi.org/10.14393/ufu.di.2017.81

The discussion about how an electric power circuit can be quantified is ancient, and has been subject of debate and researches since the 19th century. However, even with the maturity achieved over the time, many works were and still are being published about this theme. One of the most important reasons to study and develop new electric power theories is the compensation of the non-active power portion. The reactive compensation, when done correctly, brings many benefits to a power system’s operation. Nevertheless, before installing compensators, it is important to analyze the electric characteristics of the system where the compensation will be installed and the loads supplied by it. One of the most relevant issue that can't be unconsidered is the load curve. Networks with load curves that present accentuated variation may be hit by some side effects of fixed reactive compensation, that does not follow the system demand. Therefore, this paper analyzes the dynamic reactive compensators, patented by ITB Equipamentos Elétricos, as solution for circuits with this profile. The present paper describes two modelings of the dynamic compensator: the first one made in time domain and the second one, in frequency domain. The time domain modeling aims the study of the switching transients, while the frequency domain aims to determinate a practical model for studies about load and harmonic flows. After the modeling presentations, both models are validated by comparing them to real equipments tests. Finally, using the frequency domain model, the compensator behavior is studied in two electric systems: a distribution network and an industrial plant. Both circuits are implemented in a three-phase power system simulator, where the dynamic compensation is discussed and compared to the ordinary one, using fixed capacitors. The results indicate that the dynamic compensation may have a positive influence on power factor, electric losses, system loading and voltage regulation; especially in systems which the load curve has substantial variation. In addition, the exchange of fixed compensation by the dynamic compensation decreased the voltage and current harmonic distortion at the analysed buses.