위상 배열 무선 전력 전송 용 초고주파 마그네트론 주파수 및 위상 제어 Frequency and Phase Control of a Microwave Magnetron for Phased Array Wireless Power Transfer-Daejeon University of Science and Technology -2020

위상 배열 무선 전력 전송 용 초고주파 마그네트론 주파수 및 위상 제어 Frequency and Phase Control of a Microwave Magnetron for Phased Array Wireless Power Transfer 

 Author Kim Do-kyun Issues Daejeon University of Science and Technology Graduate School, 2020 Degree thesis matters Thesis (Master's)-- University of Science and Technology Graduate School : Energy and Power Conversion Engineering 2020.

 Year of issue 2020 

 writing language Korean 

 ABSTRACT 

Space solar power system (SSPS) requires to transfer electrical energy from space to the Earth. For this purpose, long-range wireless power transfer technology based on microwave phased array has been studied. The unit device for phased array system must have high energy conversion efficiency per volume. Magnetron based on vacuum electronics can be an optimal device that meets this requirement. Magnetron has higher DC-RF conversion efficiency than solid state devices have. But it suffers from frequency and phase noise so that it has limitations to using it as a unit device for a phased array system. In this paper, stabilization & control of 2.45 GHz Magnetron’s frequency and phase are reported. In order to stabilize the Magnetron oscillation frequency, we designed a high voltage filter for Magnetron power supply (SM445). Then we applied injection locking technique to control Magnetron’s frequency. A phase locking loop (PLL) is constructed for more precise phase stabilization. Phase stability of 0.3° is achieved by PLL based on injection locking technique. We expect our accomplishment can contribute to microwave-based phased array wireless power transfer.

LINK: https://www.mediafire.com/file/jmjyxhqqsi013xn/Frequency+and+Phase+Control+of+a+Microwave+Magnetron+for.pdf/file

태양전지의 모델링을 이용한 PCS 특성에 관한 연구 A Study on the Characteristics of PCS Using a Modeling of Solar Cells BY KIM SUNG-SOO Electrical & Electronic Major Semyung University Graduate School

태양전지의 모델링을 이용한 PCS 특성에 관한 연구 A Study on the Characteristics of PCS Using a Modeling of Solar Cells BY KIM SUNG-SOO Electrical & Electronic Major Semyung University Graduate School 

ABSTRACT

 In this paper, we modeled the devices used in PV system easily. Simulation tools use PSPICE to enable intuitive electrical circuit simulations. Simulations were also performed on the effects of temperature and spatial radiation that are easy to overlook when using solar cells using modelled libraries. In addition, for full operation of the photovoltaic system, a complete operation system for the DC-DC buck-boost converter and the MPPT(Maximum Power Point Tracking) control system was modeled and simulated to confirm good operation. In order to verify the operation of the simulation, we constructed an actual system with the same conditions in the simulation and experimented. As a result, we proposed a single-phase 3 kW grid-connected solar power converter. In addition to IGBT devices and GaN type MOSFETs We have obtained design data that can be diversified and increased in capacity considering the capacity. Especially, it is confirmed that GaN type MOSFET is the next generation switching device. It is possible to expand the switching frequency to 200 [kHz] and greatly reduce the size of the heat sink which can greatly improve efficiency and power factor. In future, it can be used as a stand-alone system with ESS using solar inverter, and it is possible to regenerate energy to the battery power side, and it has efficiency of 95% or more and energy saving effect is confirmed.

LINK   https://www.mediafire.com/file/rnp1m1k9rt8ou4y/A+Study+on+the+Characteristics+of+PCS+Using+a+Modeling+of+Solar+Cells.pdf/file

Reduction of Total Harmonic Distortion (THD) on Multilevel Inverter with Modified PWM using Genetic Algorithm Lucky Pradigta S.R., Ony Asrarul Q., Zainal Arief, Novie Ayub Windarko Politeknik Elektronika Negeri Surabaya

Reduction of Total Harmonic Distortion (THD) on Multilevel Inverter with Modified PWM using Genetic Algorithm Lucky Pradigta S.R., Ony Asrarul Q., Zainal Arief, Novie Ayub Windarko 

Politeknik Elektronika Negeri Surabaya 

International Journal of Engineering Technology

 Abstract

 In this research, modified PWM has been applied to the multilevel inverter (MLI) single‐phase three‐level diode clamp full bridge. Modified PWM is performed to produce minimum Total Harmonic Distortion (THD) the voltage because the quality of the good voltage is indicated by small THD. The THD indicates the quality of AC voltage source. The THD standard by the IEEE STD 519‐1992 Harmonic Voltage Limits is 5% and the Pacific Corp standard is 8%, if the THD value is greater than the THD standard it can cause the electronic load to be damaged due to the damaged waveform. Modified PWM is applied by adding a 50 Hz sinusoidal reference signal with a sinusoidal signal which has a certain amplitude, frequency and phase shift angle. The frequency of the adder signal is the frequency at which the value of the individual harmonic voltage appears (n harmonic). To get maximum result, optimization using Genetic Algorithm (GA) method to determinate amplitude & phase shift angle done. The result of implementation hardware with modified PWM shows smaller THD voltage compared to the THD voltage with Sinusoidal Pulse Width Modulation (SPWM) switching up to 0.19 or decrease 65,51 % for modified PWM of harmonic injection n = 7 with GA optimization ma= 0.8 (A=0.0936 and ø = 0 rad) and up to 0.08 or decrease 12,30 % for modified PWM of harmonic injection n = 22 with GA optimization ma = 0.4 (A=0.1221 and ø = 0 rad). 

Keywords: Multilevel Inverter, Modified PWM, Genetic Algorithm.

LINK:https://core.ac.uk/reader/190803141

Ruggedness of High-Voltage IGBTs and Protection Solutions by Thomas Basler Approved to obtain the degree of Doctor of Engineer. Technical University of Chemnitz

 Ruggedness of High-Voltage IGBTs and Protection Solutions by Thomas Basler Approved to obtain the degree of Doctor of Engineer. Technical University of Chemnitz 

Bibliographic information from the German National Library 

The German National Library lists this publication in the German National 

Bibliography; detailed bibliographical information is in the Available on the Internet at http://dnb.d-nb.de. 

This work was supported by the Faculty of Electrical Engineering and Information technology from the Technical University of Chemnitz as a dissertation Approved to obtain the degree of Doctor of Engineer. The work was written in English. Date of submission: September 10, 2013 Reviewer: Prof. Dr. Josef Lutz Prof. Dr. Steffen Bernet Dr. Roland Jakob Defense Day: February 28, 2014

ABSTRACT

Application-Oriented IGBT Requirements and Motivation of this Work

 This thesis was written at Chemnitz University of Technology in cooperation with General Electric Energy Power Conversion GmbH, former Converteam, in Berlin. Many of the tasks and problem-settings regarding the improvement of ruggedness of high-voltage IGBTs were derived directly from the industry partner and its 3-level medium-voltage converter application. This topology is widely used for industrial and traction applications [Ber00]. For the considered converter, 42-chip press-pack IGBTs with a voltage rating of 4.5 kV are used. The challenge was to investigate all possible IGBT short-circuit cases in this type of converter and to shift the complete converter protection concept to the optimum level. The interconnection between the gate unit and the IGBT and the surrounding circuit parameters like the stray and shortcircuit inductance were of special interest. In addition to the short-circuit topic, a solution should be found on how to protect the load of the converter (e.g. a large windmill generator) against asymmetric short-circuit currents and alternating torques, see Chapter 5. For this purpose, the surge-current mode of the IGBT is introduced and verified. It will be shown that this special mode can be handled by the IGBT without destruction or significant ageing. To meet the requirements and test conditions mentioned above, a singlechip test bench was constructed. New phenomena like the self-turn-off mechanism or special IGBT destructions under short-circuit and surge-current mode were studied in detail. Countermeasures were found to protect the IGBT and the complete power-electronic circuit and application from a possible destruction. 

LINK : https://core.ac.uk/reader/153229532

ИССЛЕДОВАНИЕ И РАЗРАБОТКА ЭНЕРГОПРЕОБРАЗУЮЩЕЙ АППАРАТУРЫ ВЫСОКОВОЛЬТНЫХ СИСТЕМ ЭЛЕКТРОПИТАНИЯ КОСМИЧЕСКИХ АППАРАТОВ-Черная Мария Михайловна-RESEARCH AND DEVELOPMENT OF POWER CONVERSION EQUIPMENT FOR HIGH VOLTAGE POWER SUPPLY SYSTEMS FOR SPACE VEHICLES BY --Maria Mikhailovna-

 Федеральное государственное бюджетное образовательное учреждение высшего образования «ТОМСКИЙ ГОСУДАРСТВЕННЫЙ УНИВЕРСИТЕТ СИСТЕМ УПРАВЛЕНИЯ И РАДИОЭЛЕКТРОНИКИ» (ТУСУР) 

Черная Мария Михайловна 

ИССЛЕДОВАНИЕ И РАЗРАБОТКА ЭНЕРГОПРЕОБРАЗУЮЩЕЙ АППАРАТУРЫ ВЫСОКОВОЛЬТНЫХ СИСТЕМ ЭЛЕКТРОПИТАНИЯ КОСМИЧЕСКИХ АППАРАТОВ 

05.09.12 – Силовая электроника

 Dissertation for an academic degree candidate of technical sciences Scientific adviser: Doctor of Technical Sciences, Yu.A. Shinyakov

INTRODUCTION Relevance of the topic. 

Power supply system (EPS) of the automatic spacecraft (SC) is a set of energy sources and energy-converting equipment (EPA), which stabilizes the voltage of the output power line of the load and distribution of energy flows in the PDS in accordance with the operating modes of the system and operating conditions of the spacecraft.

Significant contribution to the creation of scientific and technical groundwork in the development and the creation of power supply systems for automatic spacecraft was made by the teams of the leading enterprises of the Russian Space Agency: JSC "Information Satellite systems "them. acad. M.F. Reshetnev (Zheleznogorsk), FSUE NPO im. S.A. Lavochkin "(g. Khrunichev State Research and Production Center (Moscow), RSC Energia im. S.P. Korolev (Korolev) and others. They solve the problems of overcoming technological barriers and solving urgent scientific and technological problems, on development and implementation of innovations, ground testing of BOT, flight tests and support during the normal operation of the spacecraft.

LINK FULL PAPER:https://www.mediafire.com/file/fklk6vsa568o7ae/RESEARCH+AND+DEVELOPMENT+OF+POWER+CONVERSION+EQUIPMENT(RUSSIAN).pdf/file