-This paper presents the deployment of a didactic workbench intended to support theoretical and practical studies addressed in subjects of undergraduate and postgraduate electrical engineering courses involving photovoltaic (PV) systems. The proposed system operates in real-time and is composed of a computational graphic interface operating in conjunction with a double-stage PV system connected to the power grid. Besides the PV array, the PV system consists of a step-up DC-DC converter, intended to track the maximum power point, and a current-controlled full-bridge inverter, intended to inject the energy produced by the PV array into the grid.
Resumo-Este trabalho apresenta o desenvolvimento de um emulador eólico eletrônico (EmEE), o qual envolve os modelos dinâmicos da turbina eólica, do gerador síncrono de ímã permanente e do acoplamento mecânico turbina-gerador. Tais modelos são empregados na geração das referências de tensão do EmEE, as quais são sintetizadas por um inversor de tensão trifásico a três fios, de forma que um aerogerador real possa ser emulado para diferentes velocidades do vento. O EmEE proposto apresenta como vantagens o seu baixo custo de implementação e sua versatilidade na emulação de diferentes modelos de aerogeradores comerciais, viabilizando a realização de diversas pesquisas em laboratório. Um retificador controlado trifásico é usado no estágio de entrada do EmEE para controlar a tensão do barramento CC do inversor, bem como drenar da rede elétrica correntes senoidais, de forma que uma efetiva correção do fator de potência seja alcançada. Tanto o modelo matemático do inversor quanto do retificador de entrada, são representados no referencial síncrono dq. No intuito de validar o estudo realizado, assim como avaliar os desempenhos estáticos e dinâmicos do EmEE proposto, resultados experimentais são apresentados considerando o sistema submetido a diferentes tipos de carga e perfis de vento. Palavras-chave-Emulador eólico eletrônico, Gerador síncrono, Turbina eólica.
This work presents an electronic emulator of a wind generation system (EE-WGS) based on the wind turbine mathematical models (WTMM) virtually composed of the association of a wind turbine and a permanent magnet synchronous generator. Control references, proportional to the electrical power generated by the MMA, are calculated in a reference generation system (RGS) and used to control the input stage of the back-to-back converter composed of an isolated controlled rectifier and an inverter voltage, both connected to the power grid and sharing the same DC bus. The controlled rectifier drains sinusoidal currents from the utility grid, whose amplitudes are proportional to the power defined by the RGS. The voltage source inverter, controlled in current, controls the voltage of the DC-bus, in addition to injecting sinusoidal currents into the grid. In the RGS, the maximum power point tracking is also carried out to optimize the performance of the virtual eolic system. Additionally, in the d-q synchronous reference, the transfer functions of the power converters are presented, as well as the DC-link voltage control. Simulation and experimental results are presented to validate the proposed EE-WGS, seeking to demonstrate and evaluate their static and dynamic behaviors.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.