Transformerless Single-Phase Universal Active Filter with UPS Features and Reduced Number of Electronic Power Switches W. R. N. Santos, E. M. Fernandes, E. R. C. da Silva, C. B. Jacobina, A. C. Oliveira and P. M. Santos Federal University of Piauí - UFPI Federal University of Campina Grande - UFCG Federal University of Maranhão - UFMA-BRASIL

Transformerless Single-Phase Universal Active Filter with UPS Features and Reduced Number of Electronic Power Switches W. R. N. Santos, E. M. Fernandes, E. R. C. da Silva, C. B. Jacobina, A. C. Oliveira and P. M. Santos Federal University of Piau´ı - UFPI Federal University of Campina Grande - UFCG Federal University of Maranh˜ao - UFMA-BRASIL

 Abstract- This paper presents an universal active power filter for harmonic and reactive power compensation with UPS (Uninterrupted Power Supplies) features. The configurations does not use transformer in the series part. Transformerless modern UPS systems have been rapidly replacing the old technology due to their performance and size attributes. Reducing the numbers of passive elements and/or switches in active power filters and UPS topologies not only reduces the cost of the whole system but also provides some advantages, such as great compactness, smaller weight, and higher reliability. However, the cost reduction requires the use of more complex control strategies. The model of the proposed system is derived and it is observed that the system can be reconfigurable to operate with four or three-leg depending on the issue. A complete control system, including the PWM (Pulse-Width Modulation) techniques, is developed and a comparison between the proposed filter and the standard one is done, as well. Simulated and experimental results validate the theoretical considerations.

LINK: https://www.researchgate.net/profile/Patryckson-Santos/publication/283199831_Transformerless_Single-Phase_Universal_Active_Filter_With_UPS_Features_and_Reduced_Number_of_Electronic_Power_Switches/links/5edf89e092851cf1386c5037/Transformerless-Single-Phase-Universal-Active-Filter-With-UPS-Features-and-Reduced-Number-of-Electronic-Power-Switches.pdf

Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications by Wendell C. Alves ,*,Lenin M. F. Morais and Porfirio C. Cortizo

Design of an Highly Efficient AC-DC-AC Three-Phase Converter Using SiC for UPS Applications by Wendell C. Alves ,*,Lenin M. F. Morais  and Porfirio C. Cortizo ,

Graduate Program in Electrical Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte—MG 31270-901, Brazil Department of Electronic Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte—MG 31270-901, Brazil

Abstract 

With the constant increase of energy consumption in the world, the efficiency of systems and equipment is becoming more important. Uninterruptible Power Supply (UPS) is an equipment that provides safe and reliable supply for critical load systems, that is, systems where a supply interruption can lead to economical or even human losses. The Double Conversion UPS is the most complete UPS class in terms of load protection, regulation, performance, and reliability, however, it has lower efficiency and higher cost because of its high number of power converters. Silicon Carbide devices are emerging as an opportunity to construct power converters with higher efficiency and higher power density. The main purpose of this work is to design a three-phase AC-DC-AC converter using Silicon Carbide for Double Conversion UPS applications. The aim is to maximize efficiency and minimize volume and mass. The methodologies to size and choose the main hardware components are described in detail. Experimental results obtained with the prototype prove the high efficiency and high power density achievable with Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor (MOSFETs).

LINK: https://www.mdpi.com/2079-9292/7/12/425/htm

On the Practical Design of a High Power Density SiC Single- Phase Uninterrupted Power Supply (UPS) System Cai Chen1, Yu Chen, member, IEEE, Yifan Tan, Jianming Fang1, Fang Luo, senior member, IEEE and Yong Kang1

 On the Practical Design of a High Power Density SiC Single- Phase Uninterrupted Power Supply (UPS) System Cai Chen1, Yu Chen, member, IEEE, Yifan Tan, Jianming Fang, Fang Luo, senior member, IEEE and Yong Kang

Abstract－ this paper proposes a high power density SiC singlephase system potential for Uninterrupted Power Supply (UPS) applications. To get the high power density, the semiconductors, packaging, circuit topology and thermal design are synthetically considered. To increase the switching frequency and reduce the size of the passive components, the SiC MOSFETs and diodes are chosen; to minimize the parasitic inductances and eliminate the snubbers, the SiC bare dies are packaged as the Half-Bridge (HB) modules; to remove the bulky DC-link capacitors, the Full-Bridge inverter and the Active Power Filter (APF) are designed, and they are structured by using the fabricated SiC HB modules; and finally to dissipate the heat from such a compact enclosure in the cost-efficient way, the heat-sink of the modules and the forced air cool system are well designed, and the thermal 3D-Finite Element Analysis model is built to survey the best cooling configuration. A 2kVA prototype is built and tested, and the power density of the system is up to 58W/in3 and the maximal efficiency is up to 98.3%.

 LINK:

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