Single-phase mode operation of three-phase dab converter with triangular and sps modulations

Abstract

De acordo com o tipo de técnica de modulação aplicada ao conversor DAB, há um intervalo específico de comutação suave e, como consequência, níveis diferentes de perdas de condução, comutação e eficiência. Com a finalidade de se comparar intervalos de comutação suave e suas condições para as modulações single phase-shift e triangular, é realizada uma revisão de literatura em relação aos níveis de corrente do indutor de dispersão do transformador, princípios de operação, intervalo de e restrições de comutação suave. Nesta análise, com o objetivo de se obter uma melhora na eficiência para modos monofásicos dos conversores DAB trifásicos YY e YD, são avaliados os resultados mencionados acima para os modos monofásicos das modulações single phase-shift e triangular .São obtidos diagramas de condições de comutação suave destas duas técnicas de modulação e seus modos monofásicos correlacionados. Como a modulação triangular é conhecida por sua alta eficiência para aplicações de baixa potência, resultados de perdas de comutação, perdas de condução e eficiência são obtidos com o modelo de perdas do software PLECS. Então, com os resultados obtidos de eficiência e de perdas, ocorre a validação de resultados de simulação com estimativas calculadas de perdas e eficiência, evidenciando desta forma os resultados teóricos com os de simulação. Consequentemente, é concluído que os modos monofásicos dos conversores YY e YD, com modulação triangular, possuem menores níveis de perdas de comutação e condução, do que os modos monofásicos com modulação SPS, para aplicações em baixa potência

Abstract: According to the type of modulation technique applied to the DAB converter, there is a specific range of soft-switching and, as a consequence, different levels of conduction losses, switching losses, and efficiency. Aiming to compare the soft-switching range and its conditions of the triangular and SPS modulations, it is realized a literature review regarding the current levels in the leakage inductor of the transformer, operation principles, soft-switching range, and its constraints. To obtain the enhancement of efficiency for single-phase modes of the three-phase YY and YD DAB converters, the results mentioned above for the single-phase modes with triangular and SPS modulations. With these results, diagrams of soft-switching constraints of these two modulation techniques and their single-phase modes are obtained. As the triangular modulation is known for its high efficiency for low-power applications, levels of conduction losses, switching losses, total losses, and efficiency are obtained with the loss model of the PLECS software in the PLECS environment. Then, with the obtained simulation results of efficiency and losses, the single-phase modes with triangular and SPS modulations results are compared. Different types of modulation techniques applied to the DAB converter have a specific range of soft-switching, which results in different levels of conduction losses, switching losses, and efficiency. To compare the soft-switching range and conditions of the triangular and SPS modulations, a literature review was carried out related to the current levels in the leakage inductor of the transformer, operation principles, soft-switching range, and its constraints. To improve efficiency for single-phase modes of the three-phase YY and YD DAB converters, the results mentioned above for the single-phase modes with triangular and SPS modulations were evaluated. Diagrams of soft-switching constraints of these two modulation techniques and their single-phase modes were obtained using the results. The triangular modulation is known for its high efficiency for low-power applications. Therefore, levels of conduction losses, switching losses, total losses, and efficiency were obtained with the loss model of the PLECS software in the PLECS environment. Subsequently, simulation results of efficiency and losses with the single-phase modes of triangular and SPS modulations were compared to theoretical losses and efficiency, validating simulation results with theoretical values. It is concluded that the single-phase modes of YY and YD with triangular modulation have lower losses than those with SPS modulation for low-power applications.