A Comparative Analysis of Multiloop Voltage Regulation Strategies for Single and Three-Phase UPS Systems Poh Chiang Loh, Michael John Newman,

Abstract—Most of the many reported control algorithms for uninterruptible power supplies (UPSs) use either filter inductor or filter capacitor currents as feedback variables to regulate the output voltage. This paper explores the fundamental performance issues associated with the use of these quantities as feedback variables, with a view to determining their contribution to the transient system response and output harmonic compensation in any particular situation. A proportional plus resonant (P+resonant) compensator is then added into the outer voltage regulation loop to achieve zero steady error, to develop a high performance UPS control algorithm, which is applicable to both single-phase and three-phase systems. Theory, simulation, and experimental results are presented in the paper.
FULL PAPER
https://www.mediafire.com/?vjjvhvmmpfmarsa

Annual International Microelectronics Olympiad of Armenia

Synopsys Armenia is the general organizer of the annual Armenian Microelectronics Olympiad, reflecting the growing development of microelectronics design in Armenia. The competition spotlights Armenia’s brightest and most talented young engineers under the age of 30. Goals of the Armenian Microelectronics Olympiad: Stimulate further development of microelectronics in Armenia and in the participant countries Recognize and inspire young, talented engineers Increase interest in microelectronics among young specialists Understand the level of knowledge in the field of microelectronics among young specialists in participating countries in order to make necessary adjustments to educational programs Create a community of young specialists involved in microelectronics The topics of the Olympiad: Digital IC Design and Test Analog and Mixed Signal IC Design and Test Semiconductor Devices and Technology Mathematical and Algorithmic Issues of EDA All participants of the Armenian Microelectronics Olympiad receive participation certificates. OLYMPIAD TESTS AND PROBLEMS EIGHTH ARMENIAN MICROELECTRONICS OLYMPIAD BROCHURE

WEBSITE ORIGINAL
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms

/MicroelectronicsOlympiad/Pages/default.aspx#top

LINK DOWNLOAD OLYMPIAD TEST AND PROBLEMS
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms/MicroelectronicsOlympiad/Documents/8thOlympiadTestsandProblems.pdf

Dual Mode PWM/Linear BuckConverter by Sensinga Load Current

Dual Mode PWM/Linear BuckConverter by Sensing a Load Current
 Kyung-hwan Kim
Department of Electronics and Electrical Engineering Graduate School Dankook University ABSTRACT
Recently, the importance for power management IC(PMIC) is emphasized as battery-powered portable electronics such as smartphone are commonly used.In addition,research and development on high efficiency isessential to maximize the use of portable devices that are preferred various functions than in the past.PMIC for high efficiency usually change drastically from Linear regulators to Switching regulators. But the switching regulators have disadvantage of low efficiency compared with linear regulatorat light load conditions. Therefore,this paper is presented the using of linear regulator to increase efficiency at light load conditions and the using of switching regulator at heavy load conditions.

Modeling and design of hybrid power filters: contributions to the performance analysis in distorted voltage grid - Tiago Davi Curi Busarello

 

Title	Modeling and design of hybrid power filters: contributions to the performance analysis in distorted voltage grid (written in Portuguese)
Author	Tiago Davi Curi Busarello
Year	2013
Files	Master Dissertation. Dissertação de Mestrado Tiago Davi Curi Busarello.pdf

 

Operation Analysis of Bipolar Low-Voltage DC distribution system based on Distributed Generation

Hardware   configuration .Dual Buck voltage Balancer

Operation Analysis of Bipolar Low-Voltage DC distribution system based on Distributed Generation Han, Tae Hee
Department of Electrical Engineering Graduate School, Myongji University
 Supervised by Prof. Byung Moon Han
The DC distribution has higher efficiency than the AC distribution because it easily controls the power flow in the distributed generators, DC load, and battery storage using single power conversion. However, the DC distribution is not easy to block the fault current and it does not have specific standards compared with the AC distribution, which should be prepared through a lot of technical efforts. The DC distribution is divided into unipolar type and bipolar type. The unipolar type has a positive terminal and a negative terminal, while the bipolar type has a positive terminal, a negative terminal, and the ground terminal. Although the structure of unipolar type is simple, the reliability against fault is rather low. On the other hand, the bipolar type has higher transmission capacity and lower rated voltage of the converter, which secures the cost effectiveness. Also it is possible to form a neutral point with advantages of high reliability and stability. In this thesis, many problems that can occur from the operation of bipolar DC distribution in connection with the AC/DC interconnection operation were analyzed. The energy management method for the AC/DC power trade and the operational principle of distributed generator and energy storage were analyzed. In order to analyze the operation and performance of unipolar distribution system, a 3kW-class hardware simulator was built, which is composed of the grid-tied three-level inverter, battery storage, super capacitors, and the voltage balancer. Also the various analysis results through experiments with hardware simulator were described by a variety tests of produces hardware are described.
THESIS LINK
http://www.mediafire.com/view/iyq0ziqvjxq269y/Operation_Analysis_of_Bipolar_Low-Voltage_DC_distribution_system_based_on_Distributed_Generation-2014.pdf