Simulação e Controle de Manobras de Ilhamento de um Autoprodutor de Energia Elétrica

• Ano de defesa: 2018
• Autor(a) principal: Caetano, Lenita Bodart Guimarães
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Elétrica; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Elétrica
• Palavras-chave em Português: Microrrede (Sistemas de energia elétrica); Ilhamento (Geradores distribuídos); PSCAD (Programa de computador); Energia elétrica e calor - Cogeração; Redes inteligentes de energia; Sincronização; Sistemas Elétricos de Potência; 621.3
• Link de acesso: http://repositorio.ufes.br/handle/10/10702

The population growth, technological and economic causes that there is a constant growth of the use of electric energy, since modern life is dependent on energy. Aiming for bigger autonomy of the energy networks, it is necessary to include new sources of energy accompanied by management systems that guarantee an efficient and reliable supply and consumption of energy. In this context, the concept of microgrids, which are networks made up of energy-generating sources, electric charges and storage elements that work in parallel with the main grid and are also capable of operating in isolated (also called island) mode. Correct operation of a microgrid involves the design and development of a control system capable of correcting errors by keeping the system stable, either in connected or island mode.In this work, the simulation of the microgrid and its controls is presented. The electrical system to be evaluated is a thermoelectric plant of a steel company, consisting basically of synchronous generatorsdriven bysteam turbines, process loads and controlsresponsible for maintaining stable operation. These controls are theexcitation, load and frequency (also called supplementary control) and synchronismcontrols. This plant, through gases from steelmaking processes, is able to produce all the energy needed to supply their demandand is therefore self-sufficient in electrical power. In addition, it is also capable of operating isolated from the main grid. This proposed system will be simulated using the PSCAD software toprove the efficiency of the excitation, supplementary and synchronism controls applied in a microgrid front of the operational maneuvers currently practiced in the steel plant. There are 10 different operational maneuvers thatcan be practiced in this plant, but the most critical is that of islanding, that is, the one that performs the disconnection procedure of the system with the utility grid and maintains this system operating in islanded or isolated mode. This is the maneuver that will be evaluated in this work, which will present proposals for improvements so that this maneuver is done more efficiently.