ESS 기능을 갖는 하이브리드 UPS-Hybrid UPS with Energy Storage System Function Seung-Beom Lim✝ and Soon-Chan Hong-School of Electronics and Electrical Engineering, Dankook University

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

The Transactions of the Korean Institute of Power Electronics, Vol. 19, No. 3, June 2014

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.