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Desenvolvimento de um Retificador Trifásico Híbrido Unidirecional com Conversor Boost
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O trabalho apresentado neste documento incide sobre o tema do desenvolvimento de um
retificador trifásico híbrido unidirecional com conversor Boost. O retificador trifásico híbrido
(RTH) com conversor Boost é constituído por dois retificadores (retificador 1 e 2) e transformador
de isolamento na entrada de cada fase do retificador 2, de forma a mitigar as interações
de corrente. A mesma configuração sem os transformadores de isolamento é considerada
inviável devido às interações de corrente entre os módulos do retificador 2.
O RTH permite combinar as vantagens do retificador 1 (ponte GRAETZ) com as vantagens
do retificador 2 (correção do fator de potência), apresentando vantagens em diversas
aplicações. Analisando o RTH com conversor Boost e transformador de isolamento, existente
na literatura, está provado que essa solução "clássica" apresenta maior peso, volume e elevado
custo. Sendo assim, torna interessante e desafiador projetar um RTH com conversor Boost
sem o transformador de isolamento.
Assim, é proposto o RTH aqui descrito, com conversor Boost, mas sem transformador
de isolamento. Para tal, foi necessário substituir o indutor Boost de cada módulo do retificador
2, pelo indutor acoplado. Uma simulação preliminar do RTH proposto foi executada no
software PSIM (20 kW). Foi construído um protótipo do retificador trifásico (RT) modular com
conversor Boost e correção do fator de potência (PF), i.e., retificador 2 do RTH proposto, de 3
kW, com objetivo de validar a mitigação da interação de corrente.
Os resultados do RTH proposto, pela simulação, mostram não haver interação de corrente
e funciona de forma correta, tendo apresentado um elevado PF de 99,92% e baixa distorção
harmónica total (THD) de 3,96%. De igual modo, o protótipo do RT modular também
mostrou não haver interação de corrente entre as fases e um funcionamento ao previsto,
tendo apresentado um elevado PF (99,8%) e baixo valor da THD (3,7%). Assim, fica comprovado
que é possível implementar um RTH com conversor Boost e indutor acoplado.
The work presented in this document focuses on the development of a three-phase unidirectional hybrid rectifier with Boost converter. The three-phase hybrid rectifier (RTH) with Boost converter is composed of two rectifiers (rectifier 1 and 2) and isolation transformer at the input of each phase of rectifier 2, to mitigate current interactions. The same configuration without isolation transformers is considered unfeasible due to current interactions between rectifier 2 modules. RTH allows combining the advantages of rectifier 1 (GRAETZ bridge) with the advantages of rectifier 2 (power factor correction), thus presenting advantages in several applications. Analyzing the RTH, based on Boost converter with an isolation transformer existing in the literature, it is proved that this "classic" solution presents a heavier weight, larger volume, and higher cost. Therefore, it turns up more interesting and challenging to design an RTH with Boost converter, without the isolation transformer. Thus, an RTH with a Boost converter, but without the isolation transformer, is here proposed. For this, it was necessary to replace the Boost inductor of each module of rectifier 2, with a coupled inductor. The proposed RTH implementation was first simulated in PSIM software (20 kW). A prototype of the modular three-phase rectifier with Boost converter and power factor (PF) corrector, i.e., the rectifier 2 of the proposed RTH of 3 kW, was also built, to validate the mitigation of current interaction. The proposed RTH results simulations show that there is no current interaction and work correctly, having presented a high power factor of 99.92% and low total harmonic distortion (THD) of 3.96%. Likewise, the modular three-phase rectifier prototype also is showing no current interaction between phases and equal to the previewed operation, having presented a high PF (99.8%) and low THD value (3.7%). Thus, it is proved that it is possible to implement an RTH with Boost converter and coupled inductor.
The work presented in this document focuses on the development of a three-phase unidirectional hybrid rectifier with Boost converter. The three-phase hybrid rectifier (RTH) with Boost converter is composed of two rectifiers (rectifier 1 and 2) and isolation transformer at the input of each phase of rectifier 2, to mitigate current interactions. The same configuration without isolation transformers is considered unfeasible due to current interactions between rectifier 2 modules. RTH allows combining the advantages of rectifier 1 (GRAETZ bridge) with the advantages of rectifier 2 (power factor correction), thus presenting advantages in several applications. Analyzing the RTH, based on Boost converter with an isolation transformer existing in the literature, it is proved that this "classic" solution presents a heavier weight, larger volume, and higher cost. Therefore, it turns up more interesting and challenging to design an RTH with Boost converter, without the isolation transformer. Thus, an RTH with a Boost converter, but without the isolation transformer, is here proposed. For this, it was necessary to replace the Boost inductor of each module of rectifier 2, with a coupled inductor. The proposed RTH implementation was first simulated in PSIM software (20 kW). A prototype of the modular three-phase rectifier with Boost converter and power factor (PF) corrector, i.e., the rectifier 2 of the proposed RTH of 3 kW, was also built, to validate the mitigation of current interaction. The proposed RTH results simulations show that there is no current interaction and work correctly, having presented a high power factor of 99.92% and low total harmonic distortion (THD) of 3.96%. Likewise, the modular three-phase rectifier prototype also is showing no current interaction between phases and equal to the previewed operation, having presented a high PF (99.8%) and low THD value (3.7%). Thus, it is proved that it is possible to implement an RTH with Boost converter and coupled inductor.
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Retificador trifásico híbrido conversor Boost indutor acoplado conversores para as energias renováveis carregamento rápido dos veículos elétricos terrestres marítimos e aéreos