Gerador de indução duplamente alimentado utilizando filtro híbrido de dupla sintonia como conversor do lado da rede

• Ano de defesa: 2014
• Autor(a) principal: Nunes, Marcos Antônio do Nascimento
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Engenharia elétrica; Energia eólica; Filtering; Hybrid filtering; Wind energy
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/32908

The increasing penetration of wind generation in the interconnected national system (SIN) involves increasing the amount of wind turbines connected to the grid, and the result of that can be reflected in the quality of the energy injected into SIN. Among the types of wind turbines connected to the grid, we highlight the wind turbine based on DFIG (Doubly-Fed Induction Generator). As was seen in some literature, the problem of the origins of harmonics in wind turbines based on DFIG can be summarized in three sources, namely: harmonics generated from the GSC (grid-side converter), which flow through the filter to the grid. Most of these are filtered through the filter in traditional topology and do not represent major influences; harmonics generated from the RSC (rotor-side converter), flowing from the rotor to the stator across the air gap and then flow into the grid, and spatial harmonics that result from the machine construction and flow from the stator to the grid. These one can be sources of both harmonic and inter-harmonic given the characteristic of wind turbine in question. The harmonics generated from the two converters are multiple of the switching frequency and the one are characterized as high-order harmonics (in the range of kHz). However the spatial harmonics are low-order harmonics, they depend on the physical construction of the machine and positioning of the coils. They result in the non-characteristic harmonics, odd multiples of 3, 5, 7, 11, 13, 17, 19 and they are influenced by the slip. This work proposes a solution to these problems by way the hybrid filtering applied to the GSC, thus replacing the traditional three-phase inverter topology connected to the grid, by a double-tuned hybrid filter. This work presents the mathematical modeling of the proposed solution, as well as simulation results extracted from a model developed in the software PSCAD/EMTDC. The results obtained promising in solving the problems of harmonics present in the system.