Quantum Teleportation From Space Achieved by China!

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POWER ELECTRONICS SOLUTIONS FOR UNINTERRUPTED POWER SUPPLY AND GRID-TIE INVERTERS A Thesis Submitted to the Faculty of Purdue University by Omar N. Nezamuddin

POWER ELECTRONICS SOLUTIONS FOR UNINTERRUPTED POWER SUPPLY AND GRID-TIE INVERTERS A Thesis Submitted to the Faculty of Purdue University by Omar N. Nezamuddin Master of Science in Electrical and Computer Engineering

 ABSTRACT
 Nezamuddin, Omar N. MSECE, Purdue University, December 2014. Power Elec-tronics Solutions for Uninterrupted Power Supply and Grid-Tie Inverters.
 Major Professor: Euzeli dos Santos Jr.
 This thesis proposes two new topologies for Uninterrupted Power Supply (UPS), and a grid-tie microinverter. The rst topic will discuss an on-line transformerless UPS system based on the integrated power electronics converters that is able to con- trol the input power factor, charge the battery, and guarantee backup operation of the system. The main advantages of the proposed UPS are active power factor correc- tion (PFC) without the need of a complex control scheme, and integrated functions of the battery charger circuit and PFC with only three power switches. Operation modes of the system and the PWM strategy is presented in detail. The second topic discussed is of a proposed circuitry for a single-phase back-to-back converter for UPS applications. The main advantages of this topology is higher number of levels at the recti er side, less number of power switches, and no need for a boost inductor at the input side of the converter. The last topic discussed is of a proposed patent pending microinverter. This topic was a project funded by the National Science Foundation, and its aim was to help commercialize the research. This project proposes a solution for a solar inverter called Delta Microinverter that allows easier and faster installation as well as power conversion with higher efficiency. Delta Microinverters innovation is found in its patent-pending shape and in its patent-pending circuitry, i.e., electronics mounted inside of the Delta Microinverter. The Delta Microinverters shape has a housing con gured for rapid mounting using a single fastener and its power electron- ics con guration offers an optimized relationship between the number of levels and number of power switches.
LINK
https://core.ac.uk/reader/81633520

IMPLEMENTATION OF ONLINE IMPEDANCE MEASUREMENT SETUP FOR THREE-PHASE GRID-CONNECTED INVERTERS - TOMMI REINIKKA-Tampere University of Technology Master of Science Thesis

TOMMI REINIKKA: Implementation of online impedance measurement setup for three-phase grid-connected inverters Tampere University of Technology Master of Science Thesis,March 2017

 ABSTRACT
 In the thesis a fast method for measuring the output impedance of a grid-connected inverter by broadband excitation and cross-correlation techniques is studied. The study is made for determining stability of a grid-connected power electronics system by using impedance based stability criterion. The goal of this work is to build a test bench for inverter experiments and to verify the accuracy of the used measurement technique. Renewable power generation, such as solar and wind power, require a way to synchronize and connect to the grid. This is usually done by using grid-parallel inverters. However impedance mismatch between the grid and the interfacing inverter may cause the inverter to generate harmonic resonances. The resonance problems can be analyzed and prevented using analytical inverter models or measured frequency responses. In this thesis pseudo-random sequences and grid emulator are used to measure the inverter output impedance at a high frequency band. The experiments were done by injecting the pseudo-random binary sequence signal into the grid voltage reference. The grid voltages and currents were measured and used to calculate the inverter's frequency response with voltage as the input and current as the output. The measurements were veri ed by comparing them to theoretical values.

LINK
https://core.ac.uk/reader/80539115

Analysis of the Structures of Switching Power Supplies in the Environment OrCAD/PSpice By David Krajc-Technical University of Ostrava

Analysis of the Structures of Switching Power Supplies in the Environment OrCAD/PSpice By David Krajc Technical University of Ostrava

Abstract The thesis deals with switching power supplies and theirs characteristics. At the beginning of this thesis is a division of switching power supplies, describes the principles function and the basic characteristics circuits. They are then made suggestions of circuit components for Forward, Flyback and Push-Pull switching power supply. On the basis of simulation models are made in the environment OrCAD / PSpice subject for Power Semiconductor Systems II. At the end of the thesis simulated results are comparing with theoretical assumptions.
 LINK ORIGINAL
https://core.ac.uk/reader/84391389