Development of AC–DC Converter with 10V and 10,000A Output for Sintering -Koji Orikawa,Jun-ichi Itoh-Nagaoka University of Technology

 

Development of AC–DC Converter with 10-V and 10,000-A Output for Sintering Koji Orikawa∗ Student Member, Jun-ichi Itoh∗ Member-Nagaoka University of Technology

(Manuscript received Dec. 30, 2011, revised June 3, 2012) IEEJ Journal of Industry Applications Vol.1 No.3 pp.164–171 

 This paper discusses a high-efficiency AC–DC converter developed for implementation under low-voltage and high- current conditions for sintering applications. First, the circuit configuration and the control principle for the proposed low-voltage, high-current AC–DC converter are described. The proposed system consists of four 2,500-A units of the AC–DC converter connected in parallel. The input current harmonics are suppressed by using multiple transformers on the input side. Further, imbalance issues in the transformer parameters and the output wiring are discussed. The proposed system demonstrates that each individual circuit yields a balanced 2,500-A output. In addition, loss analysis shows that the power loss on the secondary rectifier is 49% and is dominated by semiconductor loss. Furthermore, it is shown that by implementing a MOSFET synchronous rectifier, instead of a Schottky barrier diode, the loss reduces by 35%. Finally, the input current harmonics are reduced by using multiple transformers, and the validity of this result is demonstrated.

 Keywords: sintering, low-voltage high-current, synchronous rectifier

LINK:https://www.jstage.jst.go.jp/article/ieejjia/1/3/1_164/_pdf/-char/en

A novel MPPT algorithm considering solar photovoltaic modules and load characteristics for a single stage standalone solar photovoltaic system Hwa-Dong Liu , Chang-Hua Lin , and Shiue-Der Lu-Department of Electrical Engineering, National Taiwan University of Science and Technology

 

A novel MPPT algorithm considering solar photovoltaic modules and load characteristics for a single stage standalone solar photovoltaic system Hwa-Dong Liu , Chang-Hua Lin , and Shiue-Der Lu-Department of Electrical Engineering, National Taiwan University of Science and Technology 

Abstract

 This paper proposes a novel maximum power point tracking (MPPT) algorithm that is combined with the advanced three-point weight comparison method (ATPWC) and MPPT limit detect (LD) mechanism and applied to a single stage standalone solar photovoltaic system. The boost converter is connected to the inverter and filter to deliver single-phase AC 110VAC/60 Hz to the load. The MPPT LD detects when the system does not need MPPT based on the solar photovoltaic module’s (SPV module) Rpv and load Ro. In addition, this study performs actual measurements for validation, in which the proposed algorithm is used in the built single-stage standalone solar photovoltaic system and compared with theATPWC, three- point weight comparison method (TPWC), and conventional perturbation and observation (P&O) for MPPT efficiency. The result shows that the proposed algorithm is better than the other three algorithms. When the system is under a heavy load (Rpv > Ro), the overall system efficiency is 80%, while the efficiency under a non-heavy load (Rpv  Roº is 99%. Keywords: MPPT limit detect, advanced three-point weight comparison method, single stage standalone solar photovoltaic system 

Classification: Power devices and circuits

LINK: https://www.jstage.jst.go.jp/article/elex/17/11/17_17.20200099/_pdf/-char/en

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