INDUSTRIAL UPS WITH WIDE BANDGAP (WBG) POWER TRANSISTOR devices enable smaller, lighter-weight and more efficient systems

Today’s designers are forced to achieve higher power density and higher efficiency, but the standard Silicon topologies are limited in their high frequency operation capabilities. GaN and SiC are more efficient, more thermally stable, and certainly more capable for use in power devices that demand more load or higher frequencies at higher temperatures than Silicon.

Enter a GaN soft-switching transformer-less online UPS topology which enables significant size reduction by operating efficiently at high switching frequencies using GaN power devices. See Figure 5, at right.

The proposed UPS employs standard GaN half-bridge structures with a common-neutral between the input and output and is able to achieve zero-voltage switching (ZVS) operation, in the boundary conduction mode, with no additional complex circuit design. This design employs a new control methodology for the UPS that has a dual-mode digital controller for the input PFC rectifier stage. The digital controller regulates the output voltage of the converter across both resistive and reactive loads.

The inverter (DC/AC) stage is also operated in dual-mode, and a digital controller regulates the output voltage of the converter across resistive and reactive loads. This converter architecture is capable of delivering 1-kVA of output power while maintaining unity power factor at its input. This GaN-based 1-kVA online UPS is operated using the proposed control technique in Reference 1, and is designed, built, and tested. The prototype UPS, operated up to 2MHz, achieved a power density of 26.4W/in3.

References 

1-Control of a GaN-Based High-Power-Density Single-Phase Online Uninterruptible Power Supply, Danish Shahzad, Saad Pervaiz, Nauman Zaffar, Khurram K. Afridi, IEEE 2019

2- Performance Comparison of 1200V Silicon and SiC devices for UPS Application, James McBryde, Arun Kadavelugu, Bobby Compton, Subhashish Bhattacharya, Mrinal Das, Anant Agarwal, IEEE 2010

LINK ORIGINAL:https://gan-sic-power.richardsonrfpd.com/applications/application-industrial-ups/

Go Real: Power Electronics From Simulations to Experiments in Hours Versatile experimental tool for next generation engineers by Qing-Chang Zhong, Yeqin Wang, Yiting Dong, Beibei Ren, and Mohammad Amin

Go Real: Power Electronics From Simulations to Experiments in Hours Versatile experimental tool for next generation engineers by Qing-Chang Zhong, Yeqin Wang, Yiting Dong, Beibei Ren, and Mohammad Amin 

 The only constant is change—power systems worldwide are going through a paradigm change from centralized generation to distributed generation; transportation systems are being electrified; and billions of lives in thirdworld countries are awaiting low-cost sustainable electricity. Control and power electronic technologies are two common enablers to address these grand challenges. Empowering next-generation engineers with hands-on skills in control and power electronics has become a priority for global higher education. However, setting up a suitable experimental system requires time, effort, and a broad range of expertise. This article aims to help researchers, university professors, graduate students, and engineers lower the barriers to go real from simulations to experiments for various power electronic systems and improve the efficiency and productivity of research, development, and education. It shows that it is possible to obtain experimental results within hours after completing simulations by adopting the SYNDEM Smart Grid Research and Educational Kit, which is a reconfigurable, opensource, multifunctional power electronic converter with the capability of directly downloading codes from MATLAB/Simulink. This minimizes the time, cost, and efforts needed to develop hardware systems and re - moves the burden of coding. After briefly introducing the SYNDEM kit and highlighting the automatic code generation capability, two case studies will be illustrated: an ac motor drive and a dc-dc-ac converter for an integrated PV-storage system.

LINK ENCONTRADO EN LA WEB:

https://www.nxtbook.com/nxtbooks/ieee/powerelectronics_september2020/index.php?startid=52#/p/52

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