AUTOR DO BLOG ENG.ARMANDO CAVERO MIRANDA SÃO PAULO BRASIL

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS  DO MAL"

“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”

https://picasion.com/
https://picasion.com/

domingo, 26 de setembro de 2021

Integrated Magnetic Component of a Transformer and a Magnetically Coupled Inductor for a Three-Port DC-DC Converter Shuntaro Inoue, Kenichi Itoh, Masanori Ishigaki, Takahide Sugiyama 2020 Volume 9 Issue 6 Pages 713-722 IEEJ Journal of Industry Applications


 Integrated Magnetic Component of a Transformer and a Magnetically Coupled Inductor for a Three-Port DC-DC Converter Shuntaro Inoue, Kenichi Itoh, Masanori Ishigaki, Takahide Sugiyama 2020 Volume 9 Issue 6 Pages 713-722 IEEJ Journal of Industry Applications 

ABSTRACT
 This paper discusses a design method for a proposed integrated magnetic component for an isolated bidirectional three-port DC-DC converter (TPC). TPC comprises a dual active bridge converter (DAB) and a non-isolated bidirectional DC-DC converter (NBC); each converter is independently controlled with a transformer and a magnetically coupled inductor. To reduce the size of the magnetic components, an integrated magnetic component that can integrate a magnetically coupled inductor and a transformer is implemented. A 750-W magnetically integrated TPC prototype was constructed and tested to validate the operation. The experimental results show that the efficiency of the integrated TPC is above 90% for the entire output power range, which is nearly equal to that of the conventional magnetic component. As a result, the proposed component was 10% smaller than the conventional magnetic components, and the overall size of the integrated TPC was 33% smaller than that of the conventional one.
 VIEW FULLTEXT IN WEB:

Load Current Distribution between Parallel Inverters based on Capacitor Voltage Control for UPS Applications Mohammad Bani Shamseh, Teruo Yoshino, Atsuo Kawamura--IEEJ Journal of Industry Applications-

Load Current Distribution between Parallel Inverters based on Capacitor Voltage Control for UPS Applications Mohammad Bani Shamseh, Teruo Yoshino, Atsuo Kawamura Author information 

IEEJ Journal of Industry Applications 

Abstract
 Many challenges are encountered when uninterruptible power supply (UPS) modules are operated in parallel to meet the power demand of the load. The circulating current is one prominent example of these challenges that may cause serious damage to equipment. Hence, control algorithms must ensure that the current is shared equally or in proportion to the power ratings of the parallel inverters, while mitigating the circulating current. Another challenge is that all parallel inverters should have equal output voltage, phase, and frequency. This paper proposes a new method to control parallel UPS modules. The method is based on regulating the capacitor voltage of the LCL output filter of each inverter to indirectly control its output current. The method can achieve high accuracy in terms of equal current distribution between the power sources. Simulation and experimental results are presented to verify the theoretical analysis.
LINK FREE WEB:

quinta-feira, 23 de setembro de 2021

Projeto e análise de rendimento de uma UPS monofásica de três braços e construção de um calorímetro fechado de dupla caixa-Autor:Renato Atila Silva Santana---Universidade Federal de Minas Gerais Escola de Engenharia Programa de Pós-Graduação em Engenharia Elétrica


 Abstract: An UPS is an equipment that provides continuous power supply, with high levels of quality and reliability. This equipment is usually employed for supplying mission-critical systems, in which disturbances or power interruptions can cause financial losses or damages (e.g., hospitals, bank offices, datacenters, etc.). In the literature, several topologies have been proposed as an alternative to the classical configuration with low-frequency transformers, as a solution for enhancing efficiency and power density and decreasing overall costs. Among these alternatives, transformerless solutions (i.e., without transformers) become promising, as they do not require low-frequency transformers which comprise an expressive part of overall weight and volume of a conventional UPS. In this context, a three-arm UPS is often reported as a suitable transformerless topology for low- and medium-power single-phase UPS, with high efficiency and power density. This thesis aimed to assess the performance of the single-phase three-arm UPS, concerning efficiency and power density. An alternative connection for battery set was also evaluated. Furthermore, a prototype of a direct double-jacketed calorimeter was built in order to measure the losses of power converters. The adopted methodology was based on the comparison of several three-arm UPS designs with devices made by different materials (silicon, silicon carbide and gallium nitride) and of various technologies (IGBTs, MOSFETs and cascode configuration with silicon MOSFET and GaN HFET) and packages (TO-247-3, TO-247-4, SMT top and HSOF-8). The UPS was also simulated in MATLAB/Simulink, in order to validate the modulation strategies and the techniques adopted for controlling, synchronizing and commutating between the normal state and the stored energy mode, as well as the alternative connection of the battery set. These simulations demonstrated the operation in asynchronous and synchronous modes, i.e., with an output frequency that can be decoupled or not to the means frequency. All details related to construction, dimensioning and calibration of the double-jacketed calorimeter were also presented. Preliminary experimental results were also discussed in this thesis.
LINK VIEW FULL TEXT: