Practical Design Methodology of Dual Active Bridge Converter as Isolated Bi-directional DC-DC Converter for Solid State Transformer Hyun-Jun Choi, Won-Bin Lee, and Jee-Hoon Jung

 Solid State Transformer를 위한 양방향 Dual Active Bridge DC-DC 컨버터의 설계 기법 최현준1, 이원빈1, 정지훈✝

Practical Design Methodology of Dual Active Bridge Converter as Isolated Bi-directional DC-DC Converter for Solid State Transformer Hyun-Jun Choi1, Won-Bin Lee1, and Jee-Hoon Jung

 Abstract 

Proper design guides are proposed for a practical dual-active bridge (DAB) converter based on the mathematical model on the steady state. The DAB converter is popular in bidirectional application due to its zero-voltage capability and easy bidirectional operation for seamless control, high efficiency, and performance. Some design considerations are taken to overcome the limitation of the DAB converter. The practical design methodology of power stage is discussed to minimize the conduction and switching losses of the DAB converter. Small-signal model and frequency response are derived and analyzed based on the generalized average method, which considers equivalent series resistance, to improve the dynamics, stability, and reliability with voltage regulation of the practical DAB converter. The design of closed-loop control is discussed by the derived small-signal model to obtain the pertinent gain and phase margin in steady-state operation. Experimental results of a 3.3 kW prototype of DAB converter demonstrate the validity and effectiveness of the proposed methods. 

Keywords: SST(Solid State Transformer), DAB(Dual Active Bridge) converter, BDC(Bi-Directional Converter), ZVS(Zero Voltage Switching), Small signal model, 2 pole 1 zero(2P1Z) controller

LINK: http://www.itfind.or.kr/admin/getFile.htm?identifier=02-004-170802-000009

Low Cost and High Performance Single Phase UPS Using a Single-Loop Robust Voltage Controller Jun-Keun Ji†, Dae-Kwan Ku*, and Seung-Beom Lim** †Department of Electrical Engineering, Soonchunhyang University, Asan, Korea

Low Cost and High Performance Single Phase UPS Using a Single-Loop Robust Voltage Controller Jun-Keun Ji†, Dae-Kwan Ku*, and Seung-Beom Lim** †

Department of Electrical Engineering, Soonchunhyang University, Asan, Korea *VCTech Co., Ltd., R&D Center, Gunpo, Korea **EON Co., Ltd., R&D Center, Anyang, Korea

 Abstract

 Uninterruptible Power Supplies (UPSs) can be largely divided into the passive-standby, line-interactive and double-conversion methods. This paper proposes a double-conversion UPS with a low cost and high performance. This single phase UPS uses a single-loop robust voltage controller and 1-switch voltage doubler strategy PFC. The proposed UPS is composed of a single phase PFC, a half-bridge inverter, a battery charger and a battery discharger. Finally, the validity of proposed UPS was verified by various experimental tests. Key words: 1-switch voltage doubler strategy PFC, Low cost and high performance, Single phase UPS, Single-loop robust voltage controller 

 LINK  FULL PAPER:

http://www.koreascience.or.kr/article/CFKO201136262564307.page

LINK :Design of Robust Voltage Controller for Single-phase UPS Inverter 단상 UPS 인버터의 강인한 전압제어기 설계 Ku, Dae-Kwan ; Ji, Jun-Keun ; Cha, Guee-Soo ; Moon, Jun-Hee

 http://www.koreascience.or.kr/article/JAKO201128563050510.page

LINK: Hybrid UPS with Energy Storage System Function Seung-Beom Lim✝ and Soon-Chan Hong

http://www.koreascience.or.kr/article/JAKO201419553341244.pdf

3상 UPS(무정전 전원 장치), 갤럭시 VX를 소개합니다! | 슈나이더 일렉트릭 코리아

Research Institute Uninterruptible power supply UPS 75KVA (3Ø 4W 380V) PCB BOARD, IGBT, DC capacitor, AC capacitor, blower fan, fan replacement work.

 

Research Institute Uninterruptible power supply UPS 75KVA (3Ø 4W 380V) PCB BOARD, IGBT, DC capacitor, AC capacitor, blower fan, fan replacement work. 

UPS stands for Uninterruptible Power Supply. It literally serves to supply power without interruption in case of a power outage. It is mainly used for server equipment or other electronic devices that are subject to great damage in the event of a power outage, and large-capacity UPS is often used in hospitals and security equipment large-capacity servers. As a small UPS, it may be used for broadcasting equipment or fire fighting equipment.

How to check the UPS and the need for maintenance?? 

The output voltage of a UPS becomes unstable when the life of the internal capacitors or semiconductor devices of the control board is over. Since the internal parts each have a lifespan and vary depending on the usage environment, maintenance is required to ensure that the UPS can operate normally in an emergency by checking the voltage and the temperature of the condenser during normal times.

Fonte ininterrupta de energia trifásica de alto desempenho sem transformador com dupla funcionalidade do estágio de entrada e sistema de controle digital-Venturini, William Alegranci- Dissertação (Mestrado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2016.

 

VENTURINI, William Alegranci. High performance three-phase transformerless uninterruptible power supply with double functionality of the input stage and digital control system. 2016. 222 f. Dissertação (Mestrado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2016.

 RESUMO

 Esta dissertação de mestrado propõem uma topologia de fonte ininterrupta de energia (UPS - Uninterruptible Power Supplies) trifásica de dupla conversão sem transformador com custo reduzido e sistema de controle digital. A UPS proposta é composta por um estágio de entrada, um banco de baterias, um inversor, um circuito auxiliar e chaves de transferência. O estágio de entrada assume a função de retificador trifásico com filtro LCL em modo normal de operação da UPS e é responsável pela descarga do banco de baterias em modo bateria de operação. Esta configuração reduz o custo do sistema, pois permite que seja aproveitado um circuito disponível e dimensionado para a potência nominal da UPS para a descarga do banco de baterias. Em topologias convencionais de UPSs de dupla conversão o estágio de entrada permanece ocioso durante este modo de operação e um circuito adicional é empregado para este fim. O circuito auxiliar é formado por um indutor e um braço de interruptores e é utilizado como carregador de baterias em modo normal de operação e adicionalmente é utilizado para realizar o equilíbrio das tensões dos capacitores de barramento em modo bateria. Com esta configuração, o circuito auxiliar pode ser dimensionado para apenas uma fração da potência nominal da UPS, propiciando também a redução do custo total do sistema. As chaves de transferência alteram as configurações do estágio de entrada e do circuito auxiliar de acordo com o modo de operação da UPS. É apresentada a operação detalhada da topologia, a modelagem, a estrutura de controle digital utilizada e os resultados obtidos via simulação. Por fim, um protótipo de 20 kVA é implementado e resultados experimentais são adquiridos para a validação da metodologia de projeto empregada bem como da funcionalidade do circuito proposto.

 LINK:https://repositorio.ufsm.br/bitstream/handle/1/8594/VENTURINI%2c%20WILLIAM%20ALEGRANCI.pdf?sequence=1&isAllowed=y