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Dissertations / Theses on the topic 'Voltage improvement'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Pezeshki, Houman. "Voltage balance improvement in urban low voltage distribution networks." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/84155/1/Houman_Pezeshki_Thesis.pdf.

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This project is a step forward in developing effective methods to mitigate voltage unbalance in urban residential networks. The method is proposed to reduce energy losses and improve quality of service in strongly unbalanced low-voltage networks. The method is based on phase swapping as well as optimal placement and sizing of Distribution Static Synchronous Compensator (D-STATCOM) using a Particle Swarm Optimisation method.

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2

Xiao, Shangyang. "TRANSIENT RESPONSE IMPROVEMENT FOR MULTI-PHASE VOLTAGE REGULATORS." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3909.

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Next generation microprocessor (Vcore) requirements for high current slew rates and fast transient response together with low output voltage have posed great challenges on voltage regulator (VR) design . Since the debut of Intel 80X86 series, CPUs have greatly improved in performance with a dramatic increase on power consumption. According to the latest Intel VR11 design guidelines , the operational current may ramp up to 140A with typical voltages in the 1.1V to 1.4V range, while the slew rate of the transient current can be as high as 1.9A/ns [1, 2]. Meanwhile, the transient-response require

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3

Arulampalam, A. "Power quality improvement with battery supported voltage source converters." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488248.

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4

Islas, Michael. "EFFICIENCY IMPROVEMENT TECHNIQUES FOR HIGH VOLTAGE CAPACITOR CHARGING METHODS." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2969.

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The goal of this thesis is to design and fabricate a DC-to-DC converter for use in high-voltage capacitor charging applications. The primary objectives include increasing the efficiency and reducing the cost of traditional methods used for this application. Traditional methods were not designed specifically for high-voltage capacitor charging and were thus very primitive and exhibited lower efficiency. Prior methods made use of a high voltage power supply and a current limiting resistor or control scheme. The power supply would often only operate efficiently at a single voltage value and would

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5

Omar, Saodah. "Security of supply improvement in high voltage distribution systems." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/112672/.

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In this thesis, algorithms are proposed to improve electricity distribution network supply restoration. The practical implementation of such algorithms relies on the presence of fully automated switches located at a certain number of network substations. The algorithm has the capability to restore a maximum number of customers if an outage occurs on any section of the test network. Since a very high cost is usually involved in the implementation of the fully automated system, a second algorithm was introduced with the aim of reducing the number and location of required switches. Discrete Parti

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6

Lai, Pengjie. "Improvement of Sigma Voltage Regulator - A New Power Architecture." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/31412.

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With lower output voltage (lower than 1V) and higher output current (more than 160A) required in the near future, the voltage regulators for the microprocessors, a kind of special power supplies are facing more and more critical challenges to achieve high efficiency and high power density. 90% plus efficiency for CPU VRs is expected from industry not only for the thermal management, but also for saving on electricity costs, especially for the large data-center systems. At the same time, high power density VRs are also desired due to the increasing power consumption of microprocessors as well a

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7

Vennerberg, Patrik. "Improvement of Routine Test Process of High Voltage Power Capacitors." Thesis, Högskolan Dalarna, Maskinteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:du-4097.

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The capacitor test process at ABB Capacitors in Ludvika must be improved to meet future demands for high voltage products. To find a solution to how to improve the test process, an investigation was performed to establish which parts of the process are used and how they operate. Several parts which can improves the process were identified. One of them was selected to be improved in correlation with the subject, mechanical engineering. Four concepts were generated and decision matrixes were used to systematically select the best concept. By improving the process several benefits has been added

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8

Islas, Michael E. "Efficiency improvement techniques for high voltage capacitor carging [sic] methods." Orlando, Fla. : University of Central Florida, 2009. http://purl.fcla.edu/fcla/etd/CFE0002899.

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9

Noda, Yasushi, Hitoshi Saito, Hiromasa Sato, et al. "Improvement of Cu-Cr Electrode Surface under Impulse Voltage Conditioning in Vacuum." IEEE, 2010. http://hdl.handle.net/2237/14458.

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10

Niwa, Hiroki. "Breakdown Characteristics in SiC and Improvement of PiN Diodes toward Ultrahigh-Voltage Applications." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215548.

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11

Hamad, Mostafa Saad Abdallah. "Performance improvement of a medium-voltage series-connected twelve-pulse current source converter." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607443.

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This thesis investigates the performance of a medium-voltage (MV) 12-pulse controlled rectifier in conjunction with a tapped front-end transformer used with a shunt active power filter (APF) for ac-side compensation. A series APF based on a magnetic amplifier is used for dc-side compensation. The series APF is coupled with the shunt APF to a common controlled dc-bus. forming an ac/dc unified power controller. An operating power locus is introduced that combines symmetrical and asymmetrical firing of the two constituent 6-pulse converters. It provides the ' lowest' total harmonic distortion (TH

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12

Oluwole, Osaloni Oluwafunso. "Optimal allocation of distributed generation for power loss reduction and voltage profile improvement." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20578.

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Distributed generation (DG) integration in a distribution system has increased to high penetration levels. There is a need to improve technical benefits of DG integration by optimal allocation in a power system network. These benefits include electrical power losses reduction and voltage profile improvement. Optimal DG location and sizing in a power system distribution network with the aim of reducing system power losses and improving the voltage profile still remain a major problem. Though much research has been done on optimal DG location and sizing in a power system distribution network wi

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13

Chaour, Issam. "Efficiency Improvement of RF Energy Transfer by a Modified Voltage Multiplier RF DC Converter." Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A33143.

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Radio Frequency (RF) energy transfer is getting increasingly importance in new generations of wireless sensor networks and this trend is tremendously supported by the modern trends to Internet of things (IoT). This promising technology enables proactive energy replenishment for wireless devices. With RF energy, transmission long distances between the energy source and the receiver can be overbridged. The main challenge thereby is the power conversion efficiency from a low level RF input power to a Direct Current (DC) voltage which is able to supply the mobile system. For this purpose, a novel

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14

Yazdani, Atousa. "Energy and voltage management methods for multilevel converters for bulk power system power quality improvement." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Yazdani_09007dcc805c8ecd.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed February 18, 2009) Includes bibliographical references.

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Safitri, Nelly. "Coordination of Single-Phase Rooftop PVs in Unbalanced Three-phase Residential Feeders for Voltage Profiles Improvement." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/2521.

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Three new algorithms are proposed to regulate network voltages and reduce voltage unbalance factor of distribution systems with high penetrations of singlephase rooftop PVs based on the concept of droop control. The first two algorithms rely on reactive power exchange and active power curtailment of rooftop PVs while the third algorithm takes advantage of both reactive power exchange and active power curtailment. Performance of last algorithm under a Monte Carlo-based stochastic framework is also investigated.

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16

Dan, Wu. "Improvement for LDPC Coded OFDM Communication System over Power Line." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-128177.

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Power line communication has been around in past decades and gained renewed attention thanks to the demand of high-speed Internet access. With the significant advantages of existing infrastructure and accessibility to even remote areas, power grid has become one of the promising competitors for multi-media transmission in household. However, the power line was not oriented for data transmission providing a rather hash environment. To overcome the difficulties, advanced modulation and channel coding schemes should be employed. In the thesis low density parity check code (LDPC) is employed to re

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17

Chen, Penghao. "Improvement of the Operating Efficiency and Initial Costs of a Utility-Scale Photovoltaic Array through Voltage Clamping." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1333654173.

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18

Wang, Yong. "Research on improvement of breakdown voltage of AlGaN/GaN HEMTs grown on Si(111) substrates by MOCVD /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20WANGY.

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19

Masood, Tariq. "Improvement of voltage and power flow control in the GCC power grid by using coordinated FACTS devices." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589638.

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This work presents HVDC/FACTS control device implementation framework in the Gulf cooperative council’s countries. It comprises of five layers of FACTS control devices (STATCOM, SSSC, UPFC, HVDC and centralized/De-centralized Control). This five-layer architecture is designed in order to configure and produce the desired results; based on these outcomes, GCC power system network control and operational problems can be identified and addressed within the control architecture on the GCC power grid. In the context of power FACTS-FRAME, this work is to identify and determine a number of power syst

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20

Bari, Syed Mustafa Khelat. "A Novel Inverse Charge Constant On-Time Control for High Performance Voltage Regulators." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82510.

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One of the fundamental characteristics of the microprocessor application is its property of dynamic load change. Although idle most of the time, it wakes up in nanoseconds to support sudden workload demands, which are becoming increasingly severe in today's multi-core processors with large core count. From the standpoint of its voltage regulator (VR) design, it must have very good efficiency at light loads, while also supporting a very fast transient response. Thus, the variable-frequency constant on-time current-mode (COTCM) control scheme is widely used in the VRs, as it can automatically re

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21

Togiti, Santosh. "Comparative Analysis of Load Flow Techniques for Steady State Loading Margin and Voltage Stability Improvement of Power Systems." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2042.

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Installation of reactive compensators is widely used for improving power system voltage stability. Reactive compensation also improves the system loading margin resulting in more stable and reliable operation. The improvements in system performance are highly dependent on the location where the reactive compensation is placed in the system. This paper compares three load flow analysis methods - PV curve analysis, QV sensitivity analysis, and Continuation Load Flow - in identifying system weak buses for placing reactive compensation. The methods are applied to three IEEE test systems, including

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22

Basar, Joseph James. "Improvement of Ground-Fault Relaying Selectivity through the Application of Directional Relays to High-Voltage Longwall Mining Systems." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9888.

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The continuing trend toward larger longwall mining systems has resulted in the utilization of higher system voltages. The increase in system voltage levels has caused the industry to face complexities not experienced with the lower-voltage systems. One such complexity arises from the larger system capacitance that results from the outby configuration commonly used on 4,160-V longwall power systems. Simulations show that during a line-to-ground fault, the larger system capacitance can cause a situation where the ground current sensed by the ground-fault relays in unfaulted circuits is greater t

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23

Tzeng, Jgh-Hwang, and 曾致煌. "Estimation and Improvement of Power Systems Voltage Stability." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/78190950178480175952.

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碩士<br>國立清華大學<br>電機工程研究所<br>80<br>In this thesis, first an ideal index is proposed for estimating the relative voltage stability of power system. This index has the merits of having quasilinear characteristic before system collapse, being easy to calculate, and being able to point out the weak places of the system. Next, based on the proposed index, a very practical and simple solution method is proposed for improving the system stability to live up to the desired criterion. This method is very understandable and hence is much easier to be accepted by power engineers than other methods such as

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24

Ho, Mao-Chih, and 何貿馳. "Improvement of Voltage-Mode Filter Structures in Cardiograph." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/00057658397566881281.

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碩士<br>中原大學<br>電機工程研究所<br>98<br>Abstract As society gradually enter the aging society, the devices of electronic medical monitor was most notably playing a major role in the society. As a matter of fact, it was very weakly to get of the biomedical signal message. The mood of patient and environment can affects on the measuring performance. So, it is true that study of analog filter circuit by performance and accuracy. The study improved the performance and accuracy by analog filter circuit. In the past, it is designs by the operational amplifier to the active components. The study using the act

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25

Lee, Jun-Rong, and 李俊榮. "Performance Improvement of SMPS Over Full Voltage Range." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/82494424374437518427.

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碩士<br>國立高雄應用科技大學<br>電機工程系<br>99<br>Majority of DC power source is based on switching mode power supply (SMPS) technology , the low-power SMPS product of the sponsored enterprise is studied in this thesis , and the by-back converter is selected as the main circuit structure for the performance improvement over full ac voltage range. first , an advanced converter (TEA1532) is employed to achieve changeable frequency mode which can effectively decrease no load losses. second , the other controller(IR1167) is used to implement synchronous rectification the improvement of switching losses at output

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26

Taram, Dev Kumar. "Power Quality Improvement Using Dynamic Voltage Restorer (DVR)." Thesis, 2015. http://ethesis.nitrkl.ac.in/6855/1/POWER_Taram_2015.pdf.

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Now a day power quality problem has become a major issue to deal with, in order to maintain quality supply. Modern generation greatly depends on electrical energy for improving their life style. Modern equipment like computers, electric motors etc. cannot run without electricity. In order to improve the performance, the equipment demands quality supply The power quality is affected by various factors of the electrical network. Power quality problems such as voltage and frequency variation, harmonic contents affect the performance of electrical utility and shorten its life time. Such problem ha

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27

Hou, Chi-Tsung, and 侯啟聰. "Improvement and Analysis of Voltage Flicker in Distribution Systems." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/97460187981311332352.

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碩士<br>中原大學<br>電機工程學系<br>87<br>Voltage flicker resulting from arc furnaces in the steel plants is shown to have a greater impact on the power quality. The investigation of the operation characteristics for the arc furnace and the impact of the arc furnace on the system are therefore very important. First, this thesis discusses the phenomena of voltage flicker. Then different models of the arc furnace are examined for understanding the theoretic basis mathematical methods, applicability and standard. Because the problems of voltage flicker exist in the power systems, many utilities b

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CHIH, SHEN YING, and 沈英至. "Improvement of Conversion Efficiency for Multi-Phase Voltage Regulator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/55387304329380412007.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>99<br>While the CPU performance speed turn to be faster and process progress improved, work voltage of CPU becomes lower, but a larger current consumption is needed, in order to maintain high performance. Usually, a multi-phase switching voltage regulator (MPSVR) is applied as a power supply for CPU. Low efficiency of MPSVR will cause waste of energy. However, according to practical tests and mathematical calculation facts, the efficiency of the voltage regulator at light loading condition, i.e. 25A load current, is worse than the loading condition in the range of 1

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Hu, Chun-Hsiang, and 胡竣翔. "Voltage Control Method and Improvement Strategy of Distribution Feeders." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/99933015190473197561.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>103<br>This thesis presents voltage control method and improvement strategy for distribution feeders in secondary substation in rural area. A power company often delivers electricity to customers with radial feeder system in rural area due to the cost consideration. However, the voltage at the end of the feeder will be insufficient because of feeder length in radial system. It needs voltage control device to solve the problem. Firstly, this thesis discusses of network, load models, voltage control devices, and voltage control methods of the distribution system. Final

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Chang, Che-Wei, and 張哲瑋. "A Voltage-Mode Control Algorithm for Line Voltage Transient Improvement in a Buck-Boost Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/e4y5pd.

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碩士<br>國立臺北科技大學<br>電機工程研究所<br>103<br>Public transportation has become an indispensable part of our daily life. Thus, an automotive dc-dc converter not only supplies a regulated output voltage under different vehicles, but also achieves fast line transient response to prevent the loading device from damage due to the significant variation of the output voltage. A digital signal processor (DSP) is used to control in this thesis. Utilizing the sensed input and output voltages, the control system is able to calculate the trend of inductor current. Moreover, the duty ratio can be calculated with the

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31

Wu, Ping-Chen, and 吳秉宸. "Development and Improvement of GaN-based High-Voltage LED Technology." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/47162728991316068565.

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Ho, Hsing-Ju, and 何幸儒. "Evaluation and Improvement of Voltage Transient Sag in Motor Starting." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/63067222902885837544.

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碩士<br>國立彰化師範大學<br>電機工程學系<br>102<br>This thesis mainly investigates that start-up of large motor will produce 5 to 8 times rated current in seconds when it starts. Great voltage sag on the distribution power system bus may occur and cause sensitive equipment damaged and shut down, which makes the semiconductor plants produced defectives items. In the past, indirect reduced voltage startup methods are commonly used in the industry, such as autotransformer start, wye-delta start and VVVF start. The purpose of this thesis is to build a specific DOL method by ETAP simulation software that can start

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33

Tseng, Su-Peng, and 曾恕鵬. "Reliability Verification and Improvement of High Voltage Integrated Circuit (HVIC)." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/61533528473697276416.

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碩士<br>國立交通大學<br>工學院碩士在職專班半導體材料與製程設備組<br>99<br>Abstract High Voltage Integrated Circuit (HVIC) is popularly used in the fields of LCD controller, white LED Driver and Mobile Electronics at present. For high reliability consideration, the complex process as BCD (bipolar, CMOS and LDMOS) process is introduced worldwide. For cost down purpose, the chip size is reduced as small as possible and the low cost package solutions as SOP, SOT...etc are selected. So the key works in this study are to get enough power dissipation with high ESD robustness in the compact space. This thesis uses a 42V 1A BC

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Ganta, Saikrishna. "Power Supply Rejection Improvement Techniques In Low Drop-Out Voltage Regulators." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8448.

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Low drop out (LDO) voltage regulators are widely used for post regulating the switching ripples generated by the switched mode power supplies (SMPS). Due to demand for portable applications, industry is pushing for complete system on chip power management solutions. Hence, the switching frequencies of the SMPS are increasing to allow higher level of integration. Therefore, the subsequent post-regulator LDO must have good power supply rejection (PSR) up to switching frequencies of SMPS. Unfortunately, the conventional LDOs have poor PSR at high frequencies. The objective of this research is to

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35

Yang, Kai-tsang, and 楊鎧聰. "The Study of Multifunctional NPC Converter for Voltage and Current Improvement." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/48373288384262722492.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>93<br>Out of the prosperity of the high-technology industry and the determination of human beings to pursue the higher quality of lives, the supply of the power source has become the most essential link in people’s daily lives. An electric defect will result in not only the damage of system equipments but also the great impact on both the high-technology industry and people’s daily lives. Therefore, the multifunctional NPC (Neutral-Point-Clamped) Converter, which is about to be presented in this paper, can effectively improve the stability of the voltage and the c

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Chang, Chun-Yen, and 張俊彥. "An Improvement Strategy of Voltage/Current Imbalance at Rail Traction Power." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/wm5w9u.

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碩士<br>國立雲林科技大學<br>電機工程系<br>102<br>As time evolves and the trend of eco-conscious rises, Taiwan railways administration (TRA) realizes railway electrification by converting three-phase power sources via the trail traction substations, and transmitting to the locomotives through the overhead lines. However, a locomotive is a large single-phase traction load which not only causes imbalanced three-phase power source but also affect the power quality. For this reason, an application of power electronic technology to rail traction substation is proposed in this thesis. Three traction substation sche

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Chang, Yen-ju, and 張艷如. "Voltage Stability Improvement of Wind Turbine System by Using ZnO Device." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41443576558201535300.

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碩士<br>逢甲大學<br>電機工程所<br>97<br>This thesis investigates the influences on a power system and transient stability of a wind turbine when current-limiting reactors (CLRs) and ZnO devices are installed between the system and wind turbines. Due to wind power generators are distributed generation; CLRs need to be installed to avoid large fault current caused by wind turbine failure to avert the necessary of increasing breakers capability and the phenomenon that breakers cannot interrupt fault current. However, bus voltage sag may occur on parallel point to force wind turbine outage when wind turbines

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chang, Shu-Ming, and 張書銘. "Non-ideal Effect and Improvement of Voltage Mode OTA-C Universal." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/69496854400701757451.

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碩士<br>中原大學<br>電機工程研究所<br>97<br>Abstract It is worthy of research to do the analogue circuit using Operational Transconductance Ampplifiers (OTAs) and Capacitors , because an OTA with the property of an active element can replace a resistor such that no resistors will be needed in the integrated circuit. In addition, the equivalent resistor value can be electronically tuned by varying the bias current. At present, OTA circuit is designed the best circuit with minimum error generally acknowledgedly, and possessed three following advantages at the same time: (i) using single-ended-input OTAs (o

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謝禎穎. "Improvement of Sub-threshold Voltage Extraction Methodology in Deep-submicron Process." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/29517385927319467354.

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碩士<br>明新科技大學<br>電子工程研究所<br>94<br>In a foundry fab., the yield and the total throughput of wafer productions are more concerned. It is no doubt that measurement has played an extraordinarily important role when manufacturing wafers. Usually, there will be more than tens and less than hundreds of items in whole testing. All of the tested items are listed for the different customers’ requests and the variations product applications. In the semiconductor industry, the N-type or P-type MOS field-effect transistor is the most popular application device. The threshold voltage measurement is always co

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Lin, Song-Tou, and 林松濤. "Improvement of the Power System Dynamic Voltage Characteristic with Static Compensators." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/24082998745238370235.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>92<br>The main purpose of this thesis is to study the application of the compensation devices such as Static Var Compensator (SVC), and Static Synchronous Compensator (STATCOM) to improve the dynamic voltage characteristics of Taiwan power system. In daily operation of Taiwan power system, two problems have been observed. One is the low bus voltage on Omei substation; and the other is the severe voltage oscillation on important substations after a three phase bus fault at the Chungliao South bus. In this thesis, improvement of the low bus voltage on Omei substation

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Li, Jan-Nan, and 李振南. "A Scheme of Voltage Fluctuation Improvement for Xin-Ying Primary Substation." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/73108186209795299158.

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碩士<br>崑山科技大學<br>電機工程研究所<br>103<br>As the countries all over the world face the demand of developments, many large electric users, such as steel and petrochemical plants, semiconductor parks, and distributed generation energy systems, have been widely operated on power system network, and many manufacturers start to increase the productivity by expanding set up more equipment for meeting the requirement of developments. Meanwhile, the operations of steel plants play the most important role since they provide steel materials which are most essential on industry developments. Electric arc furnace

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Hung, Chung-Yu, and 洪崇祐. "ESD Protection Design and Improvement in High-Voltage Process IC Devices." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/16732192951985250111.

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蔡政鋒. "Power factor improvement for buck-boost converter by voltage-follower technique." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/79513600560632064213.

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Chen, Po-Liang, and 陳柏良. "Improvement of Power System Voltage and Dynamic Performance Using Static Synchronous Compensators." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/88110050010864639565.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>94<br>The main purpose of this thesis is to examine the effect of Static Synchronous Compensators (STATCOMs) and Power System Stabilizers (PSSs) on the voltage and dynamic performance of Taiwan power system. Damping characteristic of low frequency oscillation modes in Taiwan power system was also investigated. The location and capacities of the STATCOMs are first determined. The dynamic voltage responses and damping ratios for the system with fixed capacitors and STATCOMs are compared. The effects of STATCOMs and PSSs on the damping tatios for the low frequency

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Chang, Chen-Han, and 張振漢. "The Study of Multi-Level Converter for Voltage and Current Quality Improvement." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/57674421933262680887.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>94<br>In the technology developing society, the supply of the power source is needed in many different situations. How to improve the voltage variation and harmonic current in the ac system will be discussed in this thesis. In order to solve these problems, the multi level PWM technology. Which lower voltage stress components, and lower voltage harmonic characteristic, is presented. The cascade circuit can reduce voltage stress components. The current harmonic distortion and voltage variation are very important in the power quality problem. In this thesis, the mu

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Liao, Yu-Chieh, and 廖御傑. "The Root Cause and Improvement of GIDL Breakdown in High Voltage nMOSFETs." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/07630715712518129716.

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碩士<br>國立交通大學<br>工學院半導體材料與製程設備學程<br>100<br>A gate-induced-drain-leakage-induced OFF-state breakdown is examined in our high-voltage depletion-mode n-channel metal–oxide–semiconductor field-effect transistors. By increasing the dosage in the n-region, a bell-shaped trend between the OFF-state breakdown voltage VBD and the dosage in the n-region is observed.Such a bell-shaped trend is found to result from two competing factors: an electric field in the gate edge and an electric field associated with the drain–bulk junction. The latter electric field is responsible for the falling part in the b

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Tang, Li-Shen, and 唐力紳. "Improvement of High-Voltage LED Arrays Using a Copper-Cup Heat Spreader." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/57907496060425888897.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>100<br>In this study, the cup-shaped copper structure was developed to improve heat dissipation of high-power LEDs array module using electroplating technique. From our design and measurement, the copper surface area and thickness were optimized for cup-shaped copper structure. Meanwhile, the compound solder was also used to enhance the thermal dissipation of LEDs. Moreover, the effect of cup-shaped copper on the output power of LEDs was investigated. For LEDs with original structure and copper heat spreader, the highest surface temperatures of 3×3 array LEDs modu

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Lee, Shih-Yao, and 李仕堯. "Voltage Flicker Analysis and Improvement Method of Grid-Connected Wind Power System." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/70079405174147427754.

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碩士<br>正修科技大學<br>電機工程研究所<br>99<br>In this thesis, the detail analysis and suggested improvement methods about voltage flicker of the grid-connected squirrel-cage induction generator system are presented. The main purpose of this research is going to analyze and develop appropriate ways to solve the problem. The system is driven by permanent magnet synchronous motor that is used to operate as the wind source in the system. Afterwards, out put power is fed to three-phase RL load, by the ways of the three-phase AC / DC converter and three-phase DC / AC inverter to connected with the electricity gr

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Liu, Kai-Jie, and 劉開捷. "Design, Implementation and Efficiency Improvement of a Low Voltage DC Power System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/29166574369408067877.

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碩士<br>清雲科技大學<br>電機工程所<br>100<br>Telecommunication system often adapts DC 48V input power supply; however, the main computer control system normally requires DC 12V power supply. As a result, it requires a DC power converter to convert 48V into 12V power system. This thesis designs a low voltage DC power system which consists of three 48V/12V/20A DC/DC buck converters with droop current sharing control to achieve equal sharing current control. Furthermore, the output currents of the DC/DC converters pass through ORing diodes at power distribution backplane to provide power to critical load. Sin

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Tasi, Chao-Yang, and 蔡詔揚. "Intelligent Controlled DSTATCOM for Power Quality Improvement and DC-Link Voltage Regulation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9yyb85.

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碩士<br>國立中央大學<br>電機工程學系<br>106<br>A distribution static compensator (DSTATCOM) is proposed to improve power quality, including the grid current harmonic and power factor, resulted from the nonlinear and linear loads. On the other hands, since the instantaneous power following into or out of the DC-link capacitor on the DC side of the DSTATCOM, a sudden load change may cause a serious DC-link voltage fluctuation across the dc capacitor. Hence, the DC-link voltage regulation control of the DSTATCOM is important especially under load variation. In this study, to improve the power quality and keep

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