The Design of Wireless Power Transmission System for Charging Lithium Ion Battery using Magnetic Induction-AUTHOR Choi Sang Gil- Pusan National University SOUTH KOREA

자기 유도 방식을 이용한 리튬 이온 배터리 충전용 무선 전력 전송 시스템 설계-The Design of Wireless Power Transmission System for Charging Lithium Ion Battery using Magnetic Induction

Submit this thesis as a master's thesis in engineering 

AUTHOR :Choi Sang Gil 

Pusan National University Graduate School Department of Robot Convergence 

Professor Ji Hee Kim

Abstract 

In General, the charging speed of the batteries for an electric vehicle are relatively longer than the conventional internal combustion engines in case of the slow-charging. Also, the conventional batteries for electric vehicle use EV charging stations or household outlets. This paper proposes a fast charging device for an electric vehicle using LCC resonant converter operating in the ZVS region to solve slow-charging problems. The Li-ion battery is charged in CC-CV mode and proposes an algorithm for compensating for transients that occur when the Li-ion battery is converted to CC-CV mode. The proposed rapid charging device has a shorter charging time than the conventional device. Automatic wireless charging is possible through parking of a fixed parking space so the situations such as charging line disconnection due to human error can be solved.

전기차를 위한 삼상 양방향 충전기의 강인 추종 제어에 대한 연구 A Study on Robust Tracking Control of a Three-phase Bidirectional Charger for Electric Vehicle Author Chivon Choeung Seoul National University of Science and Technology-SOUTH KOREA

전기차를 위한 삼상 양방향 충전기의 강인 추종 제어에 대한 연구 A Study on Robust Tracking Control of a Three-phase Bidirectional Charger for Electric Vehicle 

Author Chivon Choeung

 Seoul National University of Science and Technology -SOUTH KOREA

 Abstract

 A Study on Robust Tracking Control of a Three-phase Bidirectional Charger for Electric Vehicle Chivon Choeung (Supervised by Professor Young-Il Lee) Department of Electrical and Information Engineering Graduate School Seoul National University of Science and Technology This thesis presents a robust control strategy of a three-phase off-board bidirectional AC-DC battery charger for electric vehicle. The conventional constant current (CC) and constant voltage (CV) charging mode is considered to provide a fast charging performance for the batteries. The bidirectional charger also allows to use the full electric vehicle as an energy storage system for the electric grid, charging the in the peak-off times and delivering the energy back to the grid in peak times of electrical consumption. In discharging mode, the bidirectional charger maintains constant active power flow to grid with a given reference. The proposed control consists of inner-loop robust control and outer-loop conventional PI control. For the inner-loop robust control, a state feedback controller with integral action is employed in dq-synchronous frame. The set of stabilizing gains of this controller are determine by a Linear Matrix Inequality (LMI)-based optimization so that the convergence time to steady stead is minimized in the occurrence of the parametric uncertainties of the L-filter. The efficacy of the proposed controller is verified through simulation and experimental results on 102.4V Lithium iron phosphate (LiFePO4) batteries.

ORIGINAL LINK:

http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=afca2604c412db66ffe0bdc3ef48d419

DOWNLOAD: http://www.mediafire.com/file/q1ejfr3vhkctmok/A_Study_on_Robust_Tracking_Control_of_a_Three-phase_Bidirectional_Charger_for_Electric_Vehicle.pdf/file

THE IMPLEMENTATION OF SINGLE-STAGE PFC SCHEME POWER LIGHT APPLICATION Thesis for Master of Science Department of Electrical Engineering Tatung University AUTHOR（Jen-Fu Chung）

THE IMPLEMENTATION OF SINGLE-STAGE PFC SCHEME POWER LIGHT APPLICATION Thesis for Master of Science Department of Electrical Engineering Tatung University

AUTHOR（Jen-Fu Chung）

ABSTRACT This thesis mainly presents an implementation of a single-stage Power Factor Correction (PFC) scheme for the low power LED light application. As mater of fact, the circuit key idea is from the definition of power factor, that is the input current must follow the voltage all the time. The PF value is predicted and set properly by the proposed design equations and circuit architecture. Detail operation principles, algorithms, and experimental results are offered, and the experimental results based on 24V 700mA LED down light prototype schematic are also provided. The final PF value reaches as high as 0.980 which already satisfied the "ENERGY STAR": PF>0.9 for commercial application. In addition, the current harmonics were passed in IEC61000-3-2, too.

Index Terms: Boost Converter, Flyback converter, Single stage PFC.

LINK: http://www.mediafire.com/file/t0xzyokobsvlqi4/THE_IMPLEMENTATION_OF_SINGLE-STAGE_PFC_SCHEME_FOR_LED.pdf/file

HEAT SINK CONCEPTS AND CASE STUDIES -AUTHOR G. DHANUSHKODI SCIENTIST C-SAMMER-CENTRE FOR ELECTROMAGNETICS-INDIA

 

LINK:http://www.mediafire.com/file/974gy1qnpz0718e/DHANUSHKODI.pdf/file

The Operation and Maintenance Model for Cost Estimation of an Offshore Wind Farm-BY Jae-Hee Park-A THESIS FOR THE DEGREE OF MASTER OF ENGINEERING -JEJU NATIONAL UNIVERSITY

The Operation and Maintenance Model for Cost Estimation of an Offshore Wind Farm

GRADUATE SCHOOL JEJU NATIONAL UNIVERSITY Jae-Hee Park

A THESIS FOR THE DEGREE OF MASTER OF ENGINEERING

Abstract

Several European countries have defined targets to install and to operate offshore wind energy and according to these targets more than 40 GW offshore wind power is expected for the year 2020. Republic of Korea has also defined targets to install and operate offshore wind energy as part of its renewable energy goals. According to its targets, more than 2.5 GW offshore wind power is expected to be installed across Jeju island region and the west side of mainland by the year 2020. So the required effort for operation and maintenance of offshore wind farms will be enormous, also a thorough and appropriate plan of maintenance during the lifetime of these offshore wind turbines is essential for an economical exploitation. The aim of this thesis is to develop operation and maintenance model for an offshore wind farm in Rep. of Korea considering regional marine situation. The model should include both preventive and corrective maintenance plans which needs basic concept of wind energy, wind turbine, and maintenance strategies. The model should be based on real time metrological data, geographic data, generic wind turbine data, equipment data, spare parts and repair data. A 10 minute time series of wind speed data in public water surfaces of Daejeong-eup and 1 hourly time series of Marado significant wave height data in 2010 are used for metrological data. Equipment data is based on vessels of the operating offshore wind farm in the North Sea. Spare parts are modeled from commercial wind turbine components contribution and costs. To define repair data, there are various categories and step to determine the sequence of maintenance phases, and the corresponding amount of work, required equipment and time to organize an each maintenance phase. The operation and maintenance costs are estimated for one year in order to verify the model. A plan of operation and maintenance is set up for offshore wind farm in Jeju Island, Rep. of Korea. The results show that availability of Jeju wind farm is around 90 %. The sum of revenue losses and the total costs of repair is estimated to be approximately 27 % of generation cost which includes 11 % of the total generation cost due to limited equipment usage and 9 % of the total generation cost due to revenue losses for one year in the offshore wind farm. The proposed model can be used for the analysis of different aspects that include overall contributions and costs of operation and maintenance and to make an operation and maintenance support organization and plan for offshore wind farm in Rep. of Korea.

LINK:http://www.mediafire.com/file/7sxzk17rt7yfj04/The_Operation_and_Maintenance_Model_for_Cost_Estimation_of_an_Offshore_Wind_Farm.pdf/file