A High-Performance Online Uninterruptible Power Supply (UPS) System Based on Multitask Decomposition Qiongbin Lin, Member, IEEE, Fenghuang Cai, Wu Wang, Sixiong Chen, Zhe Zhang, Senior Member, IEEE, Shi You, Member, IEEE

 

A High-Performance Online Uninterruptible Power Supply (UPS) System Based on Multitask Decomposition Qiongbin Lin, Member, IEEE, Fenghuang Cai, Wu Wang, Sixiong Chen, Zhe Zhang, Senior Member, IEEE, Shi You, Member, IEEE

Abstract—High quality online uninterruptible power supplies (UPS) are widely used in applications e.g. precision medical equipment with critical loads. This paper proposes a low-cost and high performance online UPS system. Firstly, the performance improvement of a bidirectional switch based bridgeless power factor (PFC) converter, which is regulated by a hybrid control strategy with load current feedforward is studied. Secondly, the proposed closed-loop controller integrates improved predictive current control with predictive voltage control and applies to the second-stage neutral-point-clamped (NPC) three-level inverter for low output voltage harmonics. Moreover, a push-pull dc-dc converter interfaces and boosts voltage of a 24V battery bank as the backup energy source. Considering complexity of the UPS system as well as cost reduction, we implement a multi-task decomposition method for control on a monolithic low-cost digital signal processor (DSP) embedded with Control Law Accelerator (CLA). Finally, the experimental results from a 1kVA a prototype can effectively verify validly of the theoretical analysis and design.

LINK:https://orbit.dtu.dk/files/190201335/A_High_Performance_Online_Uninterruptible_Power_Supply_UPS_System_Based_on_Multi_task_Decomposition.pdf

Next-generation high-efficiency shunt-type differential photovoltaic power conditioner for modularization--Young-Tae Jon----Joung-Hu Park-SCHOOL OF ELECTRICAL ENGINEERING SOONGSIL UNIVERSITY SEOUL KOREA

Next-generation high-efficiency shunt-type differential photovoltaic power conditioner for modularization

Young Tae Jon----Joung-Hu Park-SCHOOL OF ELECTRICAL ENGINEERING SOONGSIL UNIVERSITY SEOUL KOREA

 PURPOSE

 Development of new concept structure, control algorithm and hardware prototype of next generation power conditioner for conversion of paradigm of PV power generation - Design of a new, parallel, integrated, modular, differential power conversion system architecture (shuffler, feedback, feed-forward structure) - Development of a high-power topology capable of maintaining high efficiency at low capacity while implementing the minimum power point tracking algorithm (Anti-MPPT algorithm) for minimizing power capacity, which is an advantage of differential power conversion - Increase efficiency and reduce size using GaN MOSFET or SiC / Schottky diode. - Optimal design of multi-loop feedback controller with stable and fast dynamic characteristics by applying Extra-Element Theorem to multi-module power converters - Proposed theory and performance analysis verification through hardware

 RESULTS Development of Next Generation Parallel Type High Efficiency Differential Power Regulator for Modularization of Photovoltaic Power Generation - Improved reliability and scalability by developing it as a parallel-type instead of a conventional serial type - A multi-winding transformer-type forward and buck converter is proposed to combine magnetizing elements to construct a high-efficiency differential power regulator circuit. : The methodology for achieving the goals was studied as follows. - Dynamic dynamics analysis, controller design and hardware fabrication of multiple module including MPPT algorithm of differential power regulator in the world's first modular PV system structure - Applied the Extra Element Theorem, which was used for the analysis of the complex system of electronics for the first time in the academic world, to the power module, the differential power modulator, and the multi-module dynamic characteristics analysis. - Developed P & O algorithm to specify anti-MPPT concept. - Developed a differential power regulator circuit using various feedback, feed-forward and shuffling topologies.

Expected Contribution

- Advantages of modular photovoltaic power Expected Contribution - Advantages of modular photovoltaic power generation system are cost reduction and efficiency improvement through standardized mass production. Therefore, it is possible to utilize the basic data of basic plan preparation corresponding to standardization of PV industry. - Apply to the environment policy for activation of solar power supply business and low carbon industrialization - Independent photovoltaic technology for satellite power supply is essential for promoting the independence of high-tech space technology currently being promoted nationally. - Wattmeter system technology in the space industry requires high reliability and flexibility (scalability). Therefore, it is possible to acquire proprietary technology by developing a modular parallel solar PV system. - In relation to other energy harvesting issues, solar energy harvesting technique is less likely to succeed than other piezoelectric (vibration) harvesting and thermal harvesting materials. - Using the results of this study, we are promoting the commercialization of the technology through the industry that is currently conducting the photovoltaic project, thereby improving the field feedback and practicality of the research result - Technology Transfer and Patent Transfer - Contributes to the academic development of the new and renewable fields through announcing SCI (annual) thesis

LINK: https://scienceon.kisti.re.kr/commons/util/originalView.do?dbt=TRKO&cn=TRKO201800005537

Development of 3kW Hybrid ESS with Function of Emergency Power Supply-Authors 양석현(Seok-Hyun Yang) ; 김민재(Min-Jae Kim) ; 최세완(Se-Wan Choi) ; 조준석(Jun-Seok Cho)

Abstract

Development of 3kW Hybrid ESS with Function of Emergency Power Supply Authors 양석현(Seok-Hyun Yang) ; 김민재(Min-Jae Kim) ; 최세완(Se-Wan Choi) ; 조준석(Jun-Seok Cho

 This paper proposes a high-efficiency 3-kW hybrid ESS with emergency power supply. The proposed system enables efficient use of power from photovoltaic (PV) cells and energy storage system (ESS). The proposed system can operate as an uninterruptible power supply (UPS) when grid fault occurs, providing seamless transfer from grid-connected mode to stand-alone mode. The LLC converter for PV achieves ZVS turn-on of switches and ZCS turn-off of diodes, and the isolated bidirectional DC-DC converter for ESS achieves ZCS turn-off regardless of load condition, resulting in high efficiency. The efficiency and performance of the proposed hybrid ESS has been verified by a 3-kW prototype.

LINK: http://www.mediafire.com/file/zy858eq2f4qpdzn/Development_of_3kW_Hybrid_ESS_with_Function_of_Eme.pdf/file

Transient Calorimetric Measurement of Ferrite Core Losses Papamanolis, P.; Guillod, T.; Krismer, F.; Kolar, J. W.-Proceedings of the 35th IEEE Applied Power Electronics Conference and Exposition (APEC 2020)

 LINK VIDEO: https://video.ethz.ch/play/presentations_2020/a0300b98-7210-4181-a5b2-2bd6fa4eaaf2.html

Transient Calorimetric Measurement of Ferrite Core Losses Papamanolis, P.; Guillod, T.; Krismer, F.; Kolar, J. W. 21.03.2020 Proceedings of the 35th IEEE Applied Power Electronics Conference and Exposition (APEC 2020)

 Abstract—An accurate and fast transient calorimetric ferrite core-loss measurement method is proposed in this paper. In contrast to electrical measurements, the accuracy of the calorimetric approach is independent of the magnetic excitation and operating frequency. However, an accurate value of the thermal capacitance of the Core Under Test (CUT) is required, which can be achieved, e.g., by measuring the specific heat capacity of the measured core material using a Differential Scanning Calorimeter (DSC) or by using the CUT as a DC electric conductor and measuring its thermal response for known Joule heating. The proposed method is tested experimentally and compared successfully to a state-ofthe- art electrical loss measurement method on MnZn ferrite cores.

LINK  : https://www.pes-publications.ee.ethz.ch/uploads/tx_ethpublications/7_APEC2020_Transient-Calorimetric-Measurement-of-Ferrite-Core-Losses_FINAL_Papamanolis_01.pdf

INVESTIGATION OF BRIDGELESS SINGLE-PHASE SOLUTIONS FOR AC-DC POWER FACTOR CORRECTED CONVERTERS by Muntasir Ul Alam. -THE UNIVERSITY OF BRITISH COLUMBIA

 INVESTIGATION OF BRIDGELESS SINGLE-PHASE SOLUTIONS FOR AC-DC POWER FACTOR CORRECTED CONVERTERS

 by Md. Muntasir Ul Alam M.E.Sc., Western University, 2010 B.Sc., Islamic University of Technology, 2006

 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in The College of Graduate Studies (Electrical Engineering) 

THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) July 2017 

LINK :https://open.library.ubc.ca/cIRcle/collections/ubctheses/24/items/1.0348980