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Guy, Richard, and edu au jillj@deakin edu au mikewood@deakin edu au wildol@deakin edu au kimg@deakin. "DISTANCE, DIALOGUE AND DIFFERENCE A Postpositivist Approach to Understanding Distance Education in Papua New Guinea." Deakin University. School of Education, 1994. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20041209.093035.
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This study focuses on the experiences of a group of educators engaged in a professional development program by distance education in Papua New Guinea.
The participants in this study have been keeping professional journals, for periods of up to three years, about their experiences of distance education. Their discourses have been used to form a connected group of research participants, who use an action framework to focus on problematic issues surrounding distance education in Papua New Guinea.
It is a piece of research, framed by critical theory, and characterised by participation, collaboration, reflexivity, reciprocity and empowerment. The process of the study is based in dialogue, and takes the view that research is constituted of a transformative perspective, which alters the way research participants understand the multiple realities in which they live and work, arid ultimately results in improvements in their lived experiences. The nature of the methodology privileges Voice' and a discourse of difference from each participant which contributes to the problematic nature of the study. The study has concerned itself, increasingly, with issues of power and control in the research process, and this has resulted in significant changes in the research as participants have become more conscious of issues such as distance, dialogue and difference.
The study has evolved over a period of time in significant ways, and evidence is available that teachers in Papua New Guinea, despite structural and pedagogical barriers, are critically reflective and are able to transform their practice in ways which are consistent with social, cultural and political contexts in which they live and work. A number of 'local1 theories about research and distance education in Papua New Guinea are developed by the participants as they become informed about issues during the research. The practice of distance education and professional development, at personal and institutional levels, undergoes reconstruction during the life of the research and the study 'signals' other ways in which distance education and professional development may be reconstructed in Papua New Guinea.
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Hecker, Rogelio Lorenzo. "Power feedback control in cylindrical grinding process." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16619.
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Cheng, Wei Min 1964. "Microwave power control strategies on the drying process." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81271.
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The current study was conducted for evaluating the effects of two different strategies viz., phase control and cycle control, on the microwave/air drying process. A phase-controlled electrical power regulator was developed and connected in series with the original cycle-controlled power regulator of an existing domestic microwave oven. The microwave oven was further modified such that combined microwave and convectional drying can be accommodated.The system performance was evaluated. It was observed that phase-controlled power regulator could be successfully used for quasi-continuous (fast-switching) power regulation with the maximization of power efficiency. The degradation of output microwave power was recorded and the nonuniform distribution of microwave field in the cavity was also verified.
The effects of phase control and cycle control were evaluated through combined microwave and convective drying of potato samples. Results showed that different power control methods had different impacts on drying kinetics and product quality. In both drying modes, the drying time increased with the decrease of microwave power density and the increase of air velocity. The drying rates of cycle-controlled drying are significantly higher than those of phase-controlled drying. In terms of rehydration capacity the phase-controlled drying mode produced better results. The product colour and sensory attributes were independent of the power control methods.
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Manansala, Edgardo Celestino. "Adaptive power system control." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54391.
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This work presents a centralized control scheme applied to a power system. The scheme has adaptive characteristics which allow the controller to keep track of the changing power system operating point and to control nonlinear functions of state variables. Feedback to the controller is obtained from phasor measurements at chosen power system buses, generator field voltage measurements, and state estimators. Control effort is aimed at minimizing the oscillations and influencing the power system state trajectory through the control of linear and nonlinear functions of state variables during a power system disturbance.
The main contributions of this dissertation are the simultaneous introduction and utilization of measurement based terms in the state and output equations in the derivation and implementation of the control law, the study of limits on controller performance as the state residual vector becomes very large, and the simulation of the performance of local state estimators to prove the need for faster phasor measurement systems.
The test system is a hypothetical 39-Bus AC power system consisting of typical components which have been sufficiently modelled for the simulation of power system performance in a dynamic stability study.Ph. D.
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Wise, Marshall Alan. "Simultaneous process control of several independent quality variables." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41532.
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A method for multivariate quality control with the dual objectives of providing a true level of sampling error probabilities for the joint control of several quality variables while also giving problem diagnoses for the quality variables individually. The method is comprised of an afine transformation of the multiple quality variables which creates a univariate test statistic used to monitor the quality and provide problem diagnoses. In practice, realized values of this statistic would be plotted as a time series on a control chart with multiple diagnosis intervals. For the analysis of the method’s effectiveness, the quality variables are assumed to be independent and normally distributed.
The method is shown to be successful in achieving desired sampling error probabilities for any m quality variables in the case of positive shifts in the means of the variables. A second transformed variable is added for the diagnosis of shifts of unrestricted direction, and its effectiveness is analyzed. The sample size requirement of the afine transformation method is compared to the total sample size necessary when a separate Shewhart chart for the mean is maintained for each quality variable with the same overall sampling plan objectives. The power of the method to detect quality problems in general while disregarding specific diagnoses is compared to the power of Hotelling’s T² test for multivariate quality control. A comprehensive evaluation of the relative worth of the two methods is not possible since the T² statistic does not consider diagnoses of the individual quality variables.Master of Science
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Han, Zhixin. "Implementation of power and force adaptive control of the end milling process." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ46583.pdf.
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Begovic, Miroslav M. "Analysis, monitoring and control of voltage stability in electric power systems." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54490.
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The work presented in this text concentrates on three aspects of voltage stability studies: analysis and determination of suitable proximity indicators, design of an effective real-time monitoring system, and determination of appropriate emergency control techniques. A simulation model of voltage collapse was built as analytical tool on 39-bus, 10-generator power system model. Voltage collapse was modeled as a saddle-node bifurcation of the system dynamic model reached by increasing the system loading. Suitable indicators for real-time monitoring were found to be the minimum singular value of power flow Jacobian matrix and generated reactive powers. A study of possibilities for reducing the number of measurements of voltage phasors needed for voltage stability monitoring was also made. The idea of load bus coherency with respect to voltage dynamics was introduced. An algorithm was presented which determines the coherent clusters of load buses in a power system based on an arbitrary criterion function, and the analysis completed with two proposed coherency criteria. Very good agreement was obtained by simulation between the results based on accurate and approximate measurements of the state vector. An algorithm was presented for identification of critical sets of loads in a voltage unstable power system, defined as a subset of loads whose changes have the most pronounced effect on the changes of minimum singular value of load flow Jacobian or generated reactive powers. Effects of load shedding of critical loads were investigated by simulation and favorable results obtained. An investigation was also done by sensitivity analysis of proximity indicators of the effects that locations and amounts of static var compensation have on the stability margin of the system. Static compensation was found to be of limited help when voltage instabilities due to heavy system loading occur in power systems. The feasibility of implementation of the analyses and algorithms presented in this text relies on development of a feasible integrated monitoring and control hardware. The phasor measurement system which was designed at Virginia Polytechnic institute and State University represents an excellent candidate for implementation of real-time monitoring and control procedures.Ph. D.
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Arora, Bela. "Exploitation, power and language in the arms control process : a neo-Gramscian perspective." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525349.
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The aim of this thesis is to challenge and re-assessth e existing approacht o the study of arms control. It outlines the ambiguity and lack of clarity in the discourse that surrounds the policy process, whilst drawing the reader's attention to the exclusionary nature of debate. This thesis argues that the arms control process has been used as a means of controlling the development of certain states. Over recent years the security studies agenda has widened considerably and recognised the influence of culture, for example, but this thesis aims to highlight the mechanisms of exploitation that are embodied in the arms control process. Existing, conventional approaches to the study of arms control often fail to highlight deeper issues of power relations, that serve to maintain the unequal international status quo. This thesis aims to highlight issues that could be a part of the future arms control agenda, that radically rethinks the theory and practice applied to date. Although there are some limitations to applications of Lukes' radical view of power, there is still scope for a valuable contribution to the arms control debate. Furthermore, by applying a neo-Gramscian perspective, as a broad conceptual umbrella, it is possible to elucidate upon the complexity of the issue and the maintenance of the hegemonic power of a small number of militarily advanced states. The globalisation process has provided an effective vehicle for the dissemination of norms and values that reinforce the dominance and leadership of a rather fluid hegemonic bloc. Furthermore, the media has been pivotal in reinforcing the international status quo by reproducing hegemonic discourses. This thesis examines the subtleties of the power relations involved in the arms control process and also poses questions about the potential long term effects of the current exploitative practices used by dominant states in regulating military development.
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Mousavi, Takami Kourosh. "Process Control and Simulation of Ferromagnetic Strip in the Power Transformers and Electrical Machines Applications : Electric power systems." Doctoral thesis, Västerås : School of Sustainable Development of Sociaty and Technology, Mälardalen University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6648.
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Dexter, Mark D. "Initial research on an inventory control process for low attrition repairable items." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27097.
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Prat, Joaquin, Alvaro Romero, Sandra Rodriguez, and Julio Farje. "Optimization of the control process in residential buildings using technological tools." Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656567.
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Many construction companies worldwide continue to implement different methodologies to optimize time and improve management in the execution of works; however, a lack of control in projects continues to be observed. For this reason, one of the most common problems currently is the incompletion of scheduled work. Due to this, it is necessary to keep better control of the projects at the execution stage so that the contractor can optimally, quickly, and easily manage the progress of all the specialties involved. In this sense, this research develops the use of the Plan Grid Application for data collection in the field and the Power Bi software for the automatic processing and information visualization through a management dashboard where indicators are shown to reflect the progress and actual performance of the activities as well as the main non-compliance causes, which leads to optimize the control process and the time spent by its administrators to carry out this management.
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Chan, Ting. "Analytical methods for power monitoring and control in an underwater observatory /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/6053.
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Li, Zhiao. "A New Design of DC-DC Converter For Capacitive Deionization Process." UKnowledge, 2014. http://uknowledge.uky.edu/ece_etds/60.
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The shortage of clean water has become a significant global problem, and capacitive deionization (CDI) is a technology that can be used to help relieve the problem. A Ćuk converter system that can recover energy from CDI cells is described. This converter transfers energy between two CDI cells when a cell is in its desorption period, allowing energy that would otherwise be lost to be recovered and improving overall system efficiency. In order to control the states of the MOSFET switches in the converter, a self boost charge pump is used. In this way, the microcontroller can control system duty cycle and optimize energy efficiency. A design method of reducing ripple losses caused by passive elements is presented. Several sensor circuits and their design methods that can minimize power losses are shown. The influence of initial voltage drop and voltage ramp time is also examined. This Ćuk converter system is tested using a dummy cell and a real CDI cell. The converter system shows promising performance experimentally.
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Bello, Simon Antonio. "Intraocular Pressure Sensing and Control for Glaucoma Research." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6466.
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Animal models of ocular hypertension are important for glaucoma research but come with experimental costs. Available methods of intraocular pressure (IOP) elevation are not always successful, the amplitude and time course of IOP changes are unpredictable and irreversible, and IOP measurement by tonometry is laborious. This dissertation focuses on the development and implementation of two novel systems for monitoring and controlling IOP without these limitations. The first device consists of a cannula implanted in the anterior chamber of the eye, a pressure sensor that continually measures IOP, and a bidirectional pump driven by control circuitry that can infuse or withdraw fluid to hold IOP at user-desired levels. A portable version was developed for tethered use on rats. The system was fully characterized and deemed ready for cage- or bench-side applications. The results lay the foundation for an implantable version that would give glaucoma researchers unparalleled knowledge and control of IOP in rats and potentially larger animals.
Moreover, a novel mathematical technique was developed to efficiently analyze IOP records obtained using the pressure controlling device. The algorithm successfully yields the value of several parameters that influence ocular physiology and are commonly linked to glaucoma development. This unique methodology uses information regarding the amount of volume necessary to maintain IOP at different levels to quantify the outflow facility of perfused eyes. The use of this technology largely simplifies the investigator’s experimental set-up and cuts procedural times in half.
The second device is an implantable pressure sensor for continuously monitoring IOP. The miniature system is equipped with pressure and temperature transducers, on-board amplifiers and a powerful microcontroller that ensure data quality. The sensor is able to obtain measurements with twice the accuracy and precision of any other IOP sensor used to date, avoid electronic drifts commonly seen in commercial sensing devices, and can potentially be used in a variety of animal models. The sensor was characterized and tested in alert rats for weeks on end. Data obtained with this device showed the presence of previously reported circadian rhythms, with IOP significantly increasing during nocturnal cycles. This technology provides researchers with an unprecedented tool to analyze IOP dynamics over time. The characterization of the amplitude, period and phase of the IOP profiles of normal and glaucomatous eyes may help establish a definitive correlation between ocular hypertension and glaucoma progression.
While implantable systems provide investigators with essential physiological data, their implementation can be difficult. Challenges such as reduced operational lifetimes and limited data acquisition capabilities are commonly faced by most bio-devices. These limitations are frequently linked to small battery capacities, however the implementation of bigger batteries is not usually viable due to size requirements. Energy harvesting technologies have surfaced in recent years in an attempt to replace battery applications; however, most technologies provide low power densities and cannot deliver continuous telemetric operation. An innovative wireless powering system was developed to overcome these limitations. The technology uses radio frequency (RF) energy transfer to continuously harvest high energy levels. Taking advantage of the controlled environment under which most research animals are housed, RF transmitters are placed around the cage to form strong, omnidirectional electric fields. An especial antenna was designed to be worn by the animal and collect large energy levels, irrespective of animal movements and positioning. The system was tested on the implantable IOP sensor for weeks, providing robust performances and allowing the sensor to collect data continuously with high precision. The device consistently generated power densities much greater than those required by the sensor. The surplus of energy could be used to operate multiple sensors simultaneously, greatly increasing the investigator’s leverage. The technology is easily adaptable to other bio-sensors and has the potential to revolutionize the biomedical field.
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MELLO, JOSÉ ROBERTO de. "Regulamentação do sistema elétrico do reator IEA-R1." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26928.
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Submitted by Marco Antonio Oliveira da Silva (maosilva@ipen.br) on 2016-12-21T12:55:48Z
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O reator IEA-R1 do Instituto de Pesquisas Energéticas e Nucleares (IPENCNEN/ SP) é um reator de pesquisa tipo piscina aberta, projetado e construído pela empresa norte-americana \"Babcock & Wilcox\", tendo, como refrigerante e moderador, água leve deionizada e berílio e grafite como refletores. Até cerca de 1988, os sistemas de segurança do reator recebiam alimentação de uma única fonte de energia. Nos anos de 1989 e 1990, uma reforma de modernização do sistema elétrico para aumentar a potência do reator e, também, para atender às normas técnicas da Comissão Nacional de Energia Nuclear (CNEN) e da Associação Brasileira de Normas Técnicas (ABNT) foi realizada. Este trabalho tem o objetivo de mostrar a relação entre o sistema de energia elétrica e a segurança do reator IEA-R1. Além disso, ele demonstra que, caso ocorra alguma interrupção de energia elétrica durante a operação do reator, esta ocorrência não irá começar um evento de acidente.
Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
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Leger, Robert P. "Analysis and monitoring of a CANDU nuclear power plant using multivariate statistical process control methods." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0032/NQ66218.pdf.
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Campion, Garry. "'People, process, place and power' : an archaeology of control in East Midlands outworking 1820-1900." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/34924.
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British industrial archaeology lacks a methodological model for interpreting 'people and process' within mundane industrial buildings and production centres, studies of which have tended to focus on their facades rather than internal organisation, function and spatial compromise. This study tests a model investigating the imposition of industrial power and control in the three staple East Midlands outworking industries of framework-knitting, lace and footwear between 1820 and 1900, through their buildings and production landscapes. The theoretical maturity of historical archaeology has partly guided the approach taken here, but the two main elements of house, workshop and master's house discussion are functional spatial analysis and a typological assessment, both originating from mainstream applications and the study of work. The development of centres of production is an added element, with an emphasis upon building styles and location. This study's principal contribution is in suggesting a model for the detailed analysis of mundane buildings and industrial landscapes, based principally upon physical evidence. An emphasis upon the control imposed upon outworkers through building design and production centre evolution is seen as central to the study, itself a reflection of the tension between speculative capital investment and the provision of appropriate living and working conditions. Demonstrating outworking continuity is viewed as secondary, being mostly revealed through buildings and the analysis of production centres - this study does not seek to revise current historical perceptions about regional outworking. Finally, because industrial archaeology lacks a clear structure within which to locate studies of this type, it is important to place this study within a theoretical, methodological and contextual matrix. In this sense the study owes more to historical archaeology than to the former, an aspect addressed briefly in the concluding chapter.
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Altay, Alkan. "Steering Of Redundant Robotic Manipulators And Spacecraft Integrated Power And Attitude Control - Control Moment Gyroscopes." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607043/index.pdf.
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In this thesis, recently developed Blended Inverse (B-inverse) steering law is
applied to two different redundant actuator systems. First, repeatability of Binverse
is demonstrated on a redundant robotic manipulator. Its singularity
avoidance and singularity transition performance is also demonstrated on the same
actuator system. It is shown that B-inverse steering law provides singularity
avoidance, singularity transition and repeatability. Second, its effectiveness is
demonstrated for an Integrated Power and Attitude Control - Control Moment
Gyroscope (IPAC-CMG) cluster, which can perform energy management and
attitude control functions simultaneously. For this purpose, an IPAC-CMG
flywheel is conceptually designed. A control policy is developed for the energy
management.
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Huang, Chiung-Yi. "The application of phasor measurements for adaptive protection and control." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/42131.
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This thesis describes an adaptive protection scheme that performs the collection of the voltage and
current phasors during post-fault period, tracking the power swing phenomena, identifying the onset
of instability, and then issuing a stabilizing command. In this work, the protection system is to
maintain the reliability! ensure the secure operation, and prevent total collapse of the power system.
The work is based upon methods of clustering for meter placement in a bulk power system, and
selecting the pilot points for installing the phasor measurement units (PMU) to measure the bus
voltage phasors and associated branch current phasors. According to the network law, fast calculation
of state estimation can be made from these measurements. Because the on-line assessment
of transient stability has to provide a quick and approximate result, the direct method which determines
stability without explicit integration techniques is applicable in this study.
The results of the system stability prediction in real-time by digital computer simulation under
stable and unstable operating conditions are presented.
Master of Science
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Glass, Jayne H. "The power of the research process : co-producing knowledge for sustainable upland estate management in Scotland." Thesis, University of the Highlands and Islands, 2011. https://pure.uhi.ac.uk/portal/en/studentthesis/the-power-of-the-research-process(1924f054-1d11-41f5-a30b-55c6e9f823b9).html.
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This thesis developed and piloted a suite of sustainability indicators for assessing the extent to which upland estate management in Scotland delivers sustainability goals. In Scotland, upland areas have a unique pattern of land ownership, with much of the land divided into ‘estates’ owned by private individuals and organisations, public bodies, and non-governmental and community organisations. Upland estate management objectives and land uses are wide-ranging - agriculture, forestry, nature conservation, property and sporting interests – set within discourses of sustainability and multifunctionality and also including new developments in tourism, renewable energy and biodiversity conservation. The complexity of upland estate management presents a great challenge, both theoretically and practically. To tackle this complexity, indicators were developed using a transdisciplinary research approach, combining academic and non-academic knowledge within a deliberative research process to address a ‘real world’ problem. A conceptual framework guided the adaptation of the Delphi technique so that the indicators were selected in a manner which: (1) increased transdisciplinary capacity; (2) facilitated knowledge integration; and (3) enhanced the potential for social learning. Using the adapted technique, the researcher facilitated an anonymous, iterative research process that took place over four rounds, and involved a mixed panel of individuals who comprised expertise in sustainability, rural and upland land use, and estate management. A contemporary and consensual definition of ‘sustainable upland estate management’ was developed by the panel, through the identification of five ‘sustainable estate principles’ (Adapting Management; Broadening Options; Ecosystem Thinking; Linking into Social Fabric; Thinking beyond the Estate) and 16 corresponding indicators (‘opportunities for sustainable estates’) within a ‘Sustainable Estates Toolkit’. The anonymous nature of the process created a safe environment for open dialogue and the researcher played an active role in stimulating participant motivation, creativity and learning.
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Svensson, Olle. "Experimental results from the Lysekil Wave Power Research Site." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-179098.
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This thesis presents how experimental results, from wave power research performed offshore at the Lysekil research site, were obtained. The data were used to verify theoretical models as well as evaluate the feasibility of wave power as a future sustainable energy source. The first experiments carried out at the research site was the measurement of the force in a line where one end was connected to a buoy with a diameter of 3 m and the other end to a set of springs with limited stroke length. The system is exposed to high peak forces compared to average forces. The maximum measured force in the line, when the buoy motion is limited by a stiff stopper rope is ten times the average force in that particular sea state. The experiment performed on the first wave energy converter tested at the Lysekil Research Site is described. The infrastructure of the site is presented where the central connection point is the measuring station. The key finding is that it is possible to transform the motions of ocean waves into electrical energy and distribute it to land. Many wave energy converters must be interconnected if large amounts of energy are to be harvested from the waves. The first submerged substation intended for aggregation of energy from wave power converters is described, with focus on the measurement and control system placed inside the substation. During this experiment period the generators were equipped with many different sensors; these measurements are explained in the thesis. The system that aggregates power from the studied wave energy converter is regularly exposed to peak power of up to 20 times the maximum average output from the converter. Vertical and horizontal movement of the buoy has been measured in different ways. The result is that the vertical displacement of the buoy can be measured with a simple accelerometer circuit but it is much more complicated to measure the horizontal displacement. A special method for measuring the horizontal displacement has been implemented by measuring the strain in the enclosure and the force in the line.Den här avhandlingen berättar om hur experimenten vid Lysekils forskningsområde för vågkraft har utförts. Insamlade mätdata har använts för att verifiera teoretiska samband som modulerats vid Elektricitetslära, Uppsala universitet. De teoretiska och praktiska resultaten har visat på att vågkraft har förutsättningarna att implementeras som en hållbar framtida energikälla. Intressanta mätmetoder har utvecklas och påfrestningarna på utrustningin och dess samband med medel effekten har studerats.
Lysekils projektet
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Pieters, Willem Diederick. "Monitoring, protection, and voltage control of parallel power transformers based on IEC 61850-9-2 process bus." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/3067.
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Thesis (MEng (Electrical Engineering)--Cape Peninsula University of Technology, 2019The purpose of an electrical power system is to supply electrical energy to the customers. Power transformers are required to transform the system voltage from generation to transmission and distribution levels. Protection and control systems must ensure that power system high voltage equipment such as transformers operate and deliver save, reliable and secure electricity supply. The aim of the project research work is to develop and implement a strategy, methods and algorithms for monitoring, protection and voltage control of parallel power transformers based on IEC 61850-9-2 process bus standard. NamPower is a power utility in Namibia. The IEC 61850 protocol for electrical substation automation system is used for the protection and control of 5 power transformers operated in parallel in an existing substation system. The IEC 61850-9-2 process bus standard is however not used in regards of Sampled Values (SV). Protection and control devices are connected to a substation communication network, routers and switches using fibre optic linked Ethernet. Inductive Current Transformers (CTs) and Voltage Transformers (VTs) secondary circuits are hardwired to Intelligent Electronic Devices (IEDs) and fibre optic links are not used for this purpose at process level communication. The research focuses on the implementation of the IEC 61850 standard with Merging Units (MUs) and sampled values to improve the existing implemented protection and control system at NamPower. This includes substation communication networks and MUs used for transformer protection, voltage regulator control and cooling fan control. At the present the CTs located at the transformer bushings and switchgear and the VTs located at the switchgear are hardwired to the inputs on protection and control IEDs. The research focuses on issues with the copper wires for voltage and currents signals and how these issues can be eliminated by using the MUs and the SV protocol. The MUs which are considered in this Thesis is to improve the voltage regulator control and the control of the cooling fan motors. The voltage regulator control IED is situated at the tap change motor drive of the On-Load Tap Changer (OLTC). The IED of each transformer is required to regulate the voltage level of the secondary side bus bar it is connected to. All the regulating IEDs are required to communicate with each other and collectively to control the bus bar voltage depending on the switching configuration of the parallel transformers. The control circuit for controlling the cooling fan motors is hardwired. Temperature analogue signal input into a programmable automation controller IED can be used for controlling the transformer cooling fans. A strategy, methods and algorithms for transformer protection, voltage regulator control and cooling fan motor control of parallel power transformers need to be developed and implemented based on IEC 61850-9-2 process bus. Power utilities and distributors can benefit from interpretation of the IEC 61850-9-2 standard and implementing MUs and SV in substations. MUs can be included in the power transformer protection, automation and control systems. A cost reduction in high voltage equipment, substation installation and commissioning costs and better performance of protection and control system are anticipated.
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Kurnianto, Kristedjo. "Application of machine learning techniques to power plant sensor validation /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17689.pdf.
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Soman, Ruturaj. "Research and development of diagnostic algorithms to support fault accommodating control for emerging shipboard power system architectures." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24389.
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The U.S. Navy has proposed development of next generation warships utilising an increased amount of power electronics devices to improve flexibility and controllability. The high power density finite inertia network is envisioned to employ automated fault detection and diagnosis to aid timely remedial action. Integration of condition monitoring and fault diagnosis to form an intelligent power distribution system is anticipated to assist decision support for crew while enhancing security and mission availability. This broad research being in the conceptual stage has lack of benchmark systems to learn from. Thorough studies are required to successfully enable realising benefits offered by using increased power electronics and automation. Application of fundamental analysis techniques is necessary to meticulously understand dynamics of a novel system and familiarisation with associated risks and their effects. Additionally, it is vital to find ways of mitigating effects of identified risks. This thesis details the developing of a generalised methodology to help focus research into artificial intelligence (AI) based diagnostic techniques. Failure Mode and Effects Analysis (FMEA) is used in identifying critical parts of the architecture. Sneak Circuit Analysis (SCA) is modified to provide signals that differentiate faults at a component level of a dc-dc step down converter. These reliability analysis techniques combined with an appropriate AI-algorithm offer a potentially robust approach that can potentially be utilised for diagnosing faults within power electronic equipment anticipated to be used onboard the novel SPS. The proposed systematic methodology could be extended to other types of power electronic converters, as well as distinguishing subsystem level faults. The combination of FMEA, SCA with AI could also be used for providing enhanced decision support. This forms part of future research in this specific arena demonstrating the positives brought about by combining reliability analyses techniques with AI for next generation naval SPS.
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Abughazaleh, Tareq Ali Ibrahim. "The viability of Weibull analysis of small samples in process manufacturing." Thesis, University of Hertfordshire, 2002. http://hdl.handle.net/2299/14042.
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This research deals with some Statistical Quality Control (SQC) methods, which are used in quality testing. It investigates the problem encountered with statistical process control (SPC) tools when small sample sizes are used. Small sample size testing is a new area of concern especially when using expensive (or large) products, which are produced in small batches (low volume production). Critical literature review and analysis of current technologies and methods in SPC with small samples testing failed to show a conformance with conventional SPC techniques, as the confidence limits for averages and standard deviation are too wide. Therefore, using such sizes will provide unsecured results with a lack in accuracy. The current research demonstrates such problems in manufacturing by using examples, in order to show the lack and the difficulties faced with conventional SPC tools (control charts). Weibull distribution has always shown a clear and acceptable prediction of failure and life behaviour with small sample size batches. Using such distribution enables the accuracy needed with small sample size to be obtained. With small sample control charts generate inaccurate confidence limits, which are low. On the contrary, Weibull theory suggests that using small samples enable achievement of accurate confidence limits. This research highlights these two aspects and explains their features in more depth. An outline of the overall problem and solution point out success of Weibull analysis when Weibull distribution is modified to overcome the problems encountered when small sample sizes are used. This work shows the viability of Weibull distribution to be used as a quality tool and construct new control charts, which will provide accurate result and detect nonconformance and variability with the use of small sample sizes. Therefore, the new proposed Weibull deduction control charts shows a successful replacement of the conventional control chart, and these new charts will compensate the errors in quality testing when using small size samples.
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Pattinson, Thomas. "Optimal sysnthesis of storageless batch plants using the Process Intermediate Storage Operational policy." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-08272008-125107/.
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Zimmerman, Mark D. "In Vivo RF Powering for Advanced Biological Research." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1212429431.
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Safdarnejad, Seyed Mostafa. "Developing Modeling, Optimization, and Advanced Process Control Frameworks for Improving the Performance of Transient Energy-Intensive Applications." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6057.
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The increasing trend of world-wide energy consumption emphasizes the importance of ongoing optimization of new and existing technologies. In this dissertation, two energy–intensive systems are simulated and optimized. Advanced estimation, optimization, and control techniques such as a moving horizon estimator and a model predictive controller are developed to enhance the profitability, product quality, and reliability of the systems. An enabling development is presented for the solution of complex dynamic optimization problems. The strategy involves an initialization approach to large–scale system models that both enhance the computational performance as well as the ability of the solver to converge to an optimal solution. One particular application of this approach is the modeling and optimization of a batch distillation column. For estimation of unknown parameters, an L1-norm method is utilized that is less sensitive to outliers than a squared error objective. The results obtained from the simple model match the experimental data and model prediction for a more rigorous model. A nonlinear statistical analysis and a sensitivity analysis are also implemented to verify the reliability of the estimated parameters. The reduced–order model developed for the batch distillation column is computationally fast and reasonably accurate and is applicable for real time control and online optimization purposes. Similar to estimation, an L1-norm objective function is applied for optimization of the column operation. Application of an L1-norm permits explicit prioritization of the multi–objective problems and adds only linear terms to the problem. Dynamic optimization of the column results in a 14% increase in the methanol product obtained from the column with 99% purity. In a second application of the methodology, the results obtained from optimization of the hybrid system of a cryogenic carbon capture (CCC) and power generation units are presented. Cryogenic carbon capture is a novel technology for CO2 removal from power generation units and has superior features such as low energy consumption, large–scale energy storage, and fast response to fluctuations in electricity demand. Grid–level energy storage of the CCC process enables 100% utilization of renewable power sources while 99% of the CO2 produced from fossil–fueled power plants is captured. In addition, energy demand of the CCC process is effectively managed by deploying the energy storage capability of this process. By exploiting time–of–day pricing, the profit obtained from dynamic optimization of this hybrid energy system offsets a significant fraction of the cost of construction of the cryogenic carbon capture plant.
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Liu, Jianzhe. "On Control and Optimization of DC Microgrids." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1512049527948171.
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Cunningham, John B. "Field Testing the Effects of Low Reynolds Number on the Power Performance of the Cal Poly Wind Power Research Center Small Wind Turbine." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2249.
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This thesis report investigates the effects of low Reynolds number on the power performance of a 3.74 m diameter horizontal axis wind turbine. The small wind turbine was field tested at the Cal Poly Wind Power Research Center to acquire its coefficient of performance, Cp, vs. tip speed ratio, λ, characteristics. A description of both the wind turbine and test setup are provided. Data filtration and processing techniques were developed to ensure a valid method to analyze and characterize wind power measurements taken in a highly variable environment. The test results demonstrated a significant drop in the wind turbine’s power performance as Reynolds number decreased. From Re = 2.76E5 to Re = 1.14E5, the rotor’s Cp_max changed from 0.30 to 0.19. The Cp vs. λ results also displayed a clear change in shape with decreasing Reynolds number. The analysis highlights the influence of the rotor’s Cl /Cd characteristics on the Cp vs. λ curve’s Reynolds number dependency. By not accounting for the effects of varying Reynolds number below the critical value for a rotor operating at constant λ, the design of the rotor planform may overestimate the actual performance of the turbine in real-world conditions. This problem is more evident in distributed-scale wind turbines, compared to utility-scale ones, because of the significantly shorter chord lengths, and therefore increased wind speed range where this effect occurs. Lastly, the wind turbine’s future control method and annual energy production are evaluated using the test results.
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Falk, Thomas. "Safety Reviews of Technical System Modifications in the Nuclear Industry." Licentiate thesis, KTH, Filosofi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118843.
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The function of safety reviews (here understood as expert judgements on proposals for design modifications and redesign of technical systems in commercial Nuclear Power Plants, supported by formalised safety review processes) plays a fundamental role for safety in nuclear installations. The primary aims of the presented case studies includes: critically examining and identifying the main areas for improvement of the existing technical safety review process as it is conducted at a Swedish nuclear power plant, developing a new process, and evaluating whether any improvements were accomplished. By using qualitative methods, observation/participation and interviews, data has been gathered on how the safety review process is perceived and conducted by experts involved in the safety review process, and ways to improve this process have been developed. This area is neglected in the larger safety literature. The novel approach here is to gather data directly from those involved in the safety review process, analysis of safety review reports as well as from inspection reports by the regulatory authority. The study presented in paper I shows that the partition between primary and independent review is positive, having supplementary roles with different focus and staff with different skills and perspectives making the reviews. The study identifies a number of areas for improvement, such as: - a tendency to put too much resource on minor assignments - a clearer prioritization would improve focus on the most critical projects - there is a need for improved guidance and direction for how to structure the work It is argued that future applications of safety review processes should focus more on communicating and clarifying the process and its adherent requirements, and improve the feedback system within the process. It is also recommended that the NPPs create introductory training for new reviewers The study presented in paper II concluded that grading of the primary safety review reports facilitates improved experience feedback by providing easier access to good examples for reviewers. Improvements identified by implementing the revised process are primarily linked to the independent safety review function, including better planning and means for resource allocation as well as clearer and more unambiguous supporting instructions. Introduction of formalized independent review meetings provides increased exchange of knowledge and strengthened the independent safety review function in the organization.QC 20130305
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Hsia, Lei, and 夏磊. "Research of AGC Control in Interconnected Power System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/xbb83p.
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碩士國立臺灣大學
電機工程學研究所
106
The power system frequency is one of the three performance indicators of the power system operating quality. Frequency stability is the basic requirement for the operation of the power system. The premise is that the power generation and load including the power loss of the network match each other. According to the load changes of the power system, how to adjust the output of the generator at any time to meet the requirements of the load changes is a problem solved by the automatic generation control. The interconnected power system has time-varying, nonlinear, large delay, uncertainty and other characteristics. The conventional PID controller can not achieve excellent control performance. In order to improve the control performance of the complex system, this thesis designs the adaptive PID controller based on fuzzy control. Comparing with the conventional PID controller, the simulation results show that: in the interconnected power system, the adaptive PID controller based on fuzzy control improves the dynamic and static characteristics of the system. Afterwards, we use the particle swarm optimization algorithm to obtain the best value of the PID control parameters. Through observing the dynamic response conditions such as the frequency of the two regions and the change of the exchange power of the connection lines, we can prove the feasibility and superiority of the method.
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Yang, Ching-Min, and 楊景閔. "A Research of Power Control Based on WLANs." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/mtvg29.
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碩士銘傳大學
資訊工程學系碩士班
93
In general, wireless local area networks (WLANs) have benefits of mobility, rapidly development, flexibility and low cost. In the mobility case, mobile devices often maintain an operation by a battery. However, the life of a battery is limited, it is worth to discuss and research this issue on how to save power consumption and support maximum efficiency. In this paper, the main aim is discussing the research of power control based on ad hoc WLAN. First, we use the antenna diversity technology to adopt the radiation pattern, change the radio direction that antenna transmitted, and then change the power level of antenna in transmission to avoid the unnecessary power consumption. The method is to measure the Signal-to-Noise Ratio (SNR) information in different environments and distances, calculate the channel maximum capacity by the Shannon theorem, and dynamicly modulate the antenna radiation pattern and transmission power level by the SNR. Then we will analyze and find the proper radiation pattern and power level to obtain the stable performance for data transmission at the minimum power consumption.
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Templer, Abby I. "Process Matters: Engaging the Productive Power of Sociological Research." 2014. https://scholarworks.umass.edu/theses/1203.
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The most common goal of professional sociology is to describe and or explain the social world. However, recognizing the performative aspects of science, and in keeping with Burawoy’s (2005) emphasis on “organic public sociology,” I ague that there is latitude within the discipline to design research with the aim of linking knowledge production and social change. I also argue that the discipline’s understanding of effecting change need not be limited to outcomes such as teaching, publication, or the creation of policy; the research process itself has social effects (Hesse-Biber, Leavy, and Yaiser 2004).
Importing a performative research design from human geography (Community Economies Collective 2001, Cameron and Gibson 2001, 2005, Gibson-Graham 2006b), I co-designed a participatory action research (PAR) project with a graduate student in Geography. We hired 23 artists and artisans from Franklin County, Massachusetts forming a research team. Our goal was to act on the world in real-time through the use of peer-to-peer interviewing.
In this paper I explore the outcomes, including the challenges, of researching from this approach. The research design and the ensuing process—training members of the research team, conducting interviews, and collaborating on projects—is the focus of my analysis. I discuss how aiming for transformation shaped our research decisions. Through my analysis of the research process, and in contrast to decision-making processes from a common sense epistemology, I argue that the interactions and connections engendered by the process itself matter just as much as the ensuing sociological understanding.
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Chu, Hsiang-Chi, and 朱祥騏. "Research of Solar Cell Containing Advanced Process Control." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15919857900188994629.
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碩士國立彰化師範大學
電機工程學系
99
This thesis is based on the semiconductor equipment communication standard protocol and APC Framework Applications defined by SEMI standard. It is applied to crystallization silicon solar cell etch equipment, and by combining programmable logic controller and computer integrated manufacturing system to reach advanced process control. According to the collect equipment movement message and information, the system offers on-line process parameter adjustment, so as to ensure the quality that the solar cell produces. If the state of production equipment is abnormal, the system will reciprocate the information and handle decision analysis immediately. It will improve the production equipment rate of utilization of the solar cell. Moreover, this research institute PLC and CIM PC communication norm and uses Ethernet configuration to transmission of the data.
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Chen, Li-Chi, and 陳立奇. "Power Monitoring and Demand Control System Research and Design." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/59825728069396842929.
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碩士國立中正大學
通訊工程研究所
99
In the recent years, our nation’s economy has been growing rapidly, as a result people’s living standard is improving. The demand for everything is increasing. Consequently, the peak power usage has increased dramatically. Especially during summer, the amount of power used for airconditioning electricity is significantly high. The peak power usage has also been increasing annually. In contrast, the development of new power systems has been extremely slowly. The growth is insufficient to meet peak loads, thus resulting in imbalance between supply and demand. Thus, power restriction measures must be taken every summer. The current global oil supplies are also running out gradually. The demand for energy is growing, so rising oil prices are inevitable. In addition, due to the lack of indigenous energy, 98% depends on imported energy. The gap between the peak and off-peak power increases every year, resulting in increased electrical power costs significantly. As a result, the government is actively pursuing various energy savings and carbon reduction measures. Adopting new sources of energy such as wind and solar is being encouraged. Although the demand for electricity is increasing every year, environmental consciousness is also growing. Setting up new power plants is becoming quite difficult. Problems due to power shortages can cause significant economic loss. Thus, to reduce supply costs, we must improve equipment utilization and reduce the possibility of power shortages. Power system must be subjected to electric power demand control and management such that the effect on the overall operational procedures is minimized to access efficiency on power monitoring and control optimization. Therefore, in enterprises, schools, and organizations, if effective energy management strategy is implemented, not only the contracted power demand can be reduced, but the electricity expenditure can also be reduced substantially with effective increase in the organization’s competitiveness. Energy-saving management mainly includes the installation of a power monitoring and demand control system. In this Thesis, a power monitoring and demand control system design is proposed. The programmable logic controller (PLC) with multi-function digital power meter are used along with the development of human machine interfaces to integrate the applications created. Based on the power demand, the electrical equipment (load) can be shut-down or restarted. The system can display power usages in real-time via in a personal computer, record the load control into the database, provide history data query and analyze related equipment, thus assisting in the setting, tuning, and planning of equipments’ electricity usage. Experiments show that it can achieve the effect of power optimization and provide guidelines to setup demand contracts.
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Chou, Chia-Wen, and 周佳雯. "Complexity Measurement of Process Control in the Nuclear Power Plant." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/15501700579564053852.
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碩士國立清華大學
工業工程與工程管理學系
88
Because the nuclear power plant is a big-scale procedural operating system, operators in it have to operate according to standard operating procedures in order to reach the goal of safety and efficiency. However, the complexity of operating procedures may increase the operators’ mental workload, so this research is to realize the complexity of operating procedures and to find out the bottleneck of the procedure for the direction of future improvement. In this research, operation procedures are introduced briefly at first and then some mental workload measurement methods and software/program complexity measurement methods are collected. Next, the concepts of motion study are combined with job evaluation to develop a method to measure the complexity degree of processes. The process complexity measurement method is divided into three aspects, i.e. complexity of executing contents in one step, module complexity and whole process complexity. By the calculation with the method, one can get complexity values of each aspect and whole process complexity value to represent the complexity of the process. Emergency operation procedure 500.3 EOP-RC of the nuclear power plant in Taiwan is selected as an example to conduct the method. At last, the factors affecting process complexity are discussed and the future improvement directions are proposed for further research.
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Yung-TaiChou and 周永泰. "Planar MOS Control Diode Components Design and Process Research." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/k2evg4.
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碩士國立成功大學
電機工程學系
104
This thesis is to study the design and process of MOS Controlled diode device. At the same time, it sees a Planar MOS Controlled diode device as the main framework to improve the electrical characteristics of the traditional power Schottky diode. (MOS Control diode) in the applications of power electronics has low forward voltage (VF) and lower power consumption of device. Besides, the leakage is lower than traditional Schottky diode under the off state. It performs better and can be operated at higher temperature. Due to the higher leakage of traditional Schottky diode is at higher temperature with higher reverse power consumption. Traditional Schottky reduces its performance rapidly with higher temperature and causes device burn with thermal runaway easily. In this paper, the most important part of the (MOS Controlled diode) structure is the gate oxide to form MOS channel. The gate oxide produces a super barrier and makes major carriers without Schottky’s MS contact. The metal oxide semiconductor gate can adjust the electric potential. This makes the metal oxide semiconductor diode which controls its basic operation principles and with same electrical parameter of Schottky barrier diode. MOS controlled diode has more stable and reliable diode device due to its low consumption. As a result, it is with higher junction temperature Tj can be applied at higher temperature environment.
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LIN, KUAN-HSIEN, and 林冠憲. "Research on Integrated Circuit Manufacturing Process Thermostatic Control System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/33286880553700150167.
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碩士崑山科技大學
電子工程研究所
104
In this paper, we research on thermostatic control system of integrated circuit manufacturing process. The thermostatic control system is mainly applied to semiconductor etching process, it includes the refrigerant system and thermostatic control system. Thermostatic control system which used PID and PLC controls refrigerant system to achieve thermostatic balance state of cooling Coolant. We use electric circuit board add in singal to simulate the problems of thermostatic control system and use Arduino microprocessor to simulate temperature diversification.
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Shen, Chia-Huei, and 沈洽輝. "Research on Power Control Algorithms over TDMA Personal Communication Systems." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/03899396161267433807.
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碩士國立中正大學
電機工程學系
85
Future PCS cellular networks will mainly be driven by high quality channel,high bandwith utilization,low power consumption and efficient network management. Power control is one of the several major techniques which can help to address the goals. Power control technique can reduce cochannel interference and allow as many links as possible to obtain satisfactory reception. The goal of this thesis is to investigate uplink power control algorithms in TDMA cellular systems. Simulation is used as the main tool to explore the performance improvement by power control. In this thesis, the design parameters of PACS (Personal Access Communications System) power control algorithm are verified. Moreover, SIR-Based and SFP (Short-term Fading Prediction) power control methods are also applied to PACS system. Finally, we propose a new power control method named PID (Proportional Integration Derivative) algorithm and apply it to PACS system. PID power control algorithm is proved to be a better choice for TDMA cellular system whose power control delay is about 3-frame interval.
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Lin, Shang-Yo, and 林炫佑. "Research on Uplink Power Control Method for Cellular Radio System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/59074563003637713627.
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碩士國立中正大學
電機工程學系
86
DS/CDMA has been proposed to increase the system capacity in cellular radio system. Power control is a key factor to achieve the requirement of high quality and high capacity for DS/CDMA cellular radio systems. In previousreseaches, both of strength- based and SIR-based power methods usually fail tocompensate the variation of short-ter(m fading in accuracy due to the loop delayconstraint. Recently, Wen and Yeh have proposed a downklink short-term fadingprediction-based (SFP-based) power control method to track and predict the trend of short-term fading in time. In this thesis, we further study the behavior of SFP-based power control in uplink. Similarly, we investigate the uplink SFP-based power control method with synchronous and asynchronous modes. Moreover,we further study the effect of different updaing rate for each mobile according to its speed and compare the difference between downlink and uplink SFP-basedpower control methods. Finally, a novel SIR-based fuzzy power control method, with which the desired level of each mobile is adaptively adjusted by a fuzzyrule, is proposed to improve the system performance.
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CHANG, CHU-WEI, and 張竹維. "A Research of Remote Control of Power Information Query System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/95692005291995254638.
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碩士聖約翰科技大學
電子工程系碩士班
103
In the trend, bath the oil and electric are increasing. How to arrive saving electric and carbon reduction is one of the major issues. The paper puts forward for this topic to issue a approach to improve. Before this time, the most people used electricity information to infer various appliances in equipment in home. In ahead, we can manage the appliances electricity. Through this paper, the user can anytime check the power dissipation to check whether exceeded the restrictions range or not? The implemented system has a smart meter to automatically manage the electricity information. With respecting the traditional power meter that read by human. This implemented work has more efficiently and avoid negligence for peoples so can greatly improve the power management to have more correctly and integrity。Mainly architecture of this thesis is to obtain the power information and to measure by smart meter, and then through the ZigBee transmits to the cloud database, which is established by the SQL. We also employ the C# programming language to create the human-machine interface. So we can easily and directly obtain the electricity situation don’t through the monthly payment amount。
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Yeh, Lung-Chuan, and 葉龍泉. "Research on Power Control Algorithms over CDMA Cellular Mobile Systems." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/80406741628657649679.
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碩士國立中正大學
電機工程學系
84
ABSTRACT In order to increase the system capacity in cellular mobile system,direct-sequence code-division multiple access (CDMA) techniques havereceived extensive attention as an alternative digital technology option formobile and personal communications. Power control is an effective way ofincreasing the system capacity and quality of communication in the use ofCDMA techniques. In this thesis, we propose two short-term fading prediction-based (SFP)power control method named distributed SFP power control method andcentralized SFP power control method to predict the short- term fading effectaccurately. A computer program is contributed to simulate the performance ofthese methods. Simulation results show that these two SFP power controlmethods can predict and track the short-term fading in time thus improve thesystem performance. Besides, we also consider the effect of asynchron ouspower control, in which the instant that the downlink transmitted power isupdated is assumed to be asynchronous. In addition, we further investigatethe effect of different updating rates for each mobile according to itsspeed on system performance.
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Cheng, Tsung-Chieh, and 鄭宗杰. "The Study of Typical Process Loop Control System for Power Plant." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/82125403626304920229.
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碩士國防大學中正理工學院
電子工程研究所
91
The typical process loop (TPL) of power plant is simplified and referred to the process loop, which is the type of steam turbine generator on Taiwan Power Company (TPC). It is built of the integrated digital system at the laboratory of integrated design on instrumentation and control, Nuclear Instrumentation Division, Institute of Nuclear Energy Research. The TPL demonstrated the organization of instrumentation and control between final control devices and controllers, and then exhibited the running of power plant. The study is a category of power plant on TPC, a probe into the complete equipment of TPL, and the restriction was imposed on TPL. The application of distributed control system (Foxboro I/A) made the automatic control on water level and pressure of TPL. The analysis of system boundary is accomplished successfully, then to draw up the specification of performance index. The user knows how to manipulate TPL through the workstation of Foxboro I/A implemented the human machine interface. The values of parameters are required to conform proportional and integral (PI) controller’s behavior to the specification of performance index. The parameters tuning is experimenting with Taguchi method to get the optimal values of parameters.
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Wang, Chung-Cheng, and 王忠誠. "Research on Lithographic In-line Process Control from Scatterometry Measurements." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/56353516546764590624.
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碩士國立交通大學
工學院碩士在職專班半導體材料與製程設備組
97
As lithography technology keep shrinking CD size, the accuracy of CD measurement and process control become more and more important. Improve within wafer CDU also can improve product yield. After photo-resist from DNQ/Nolvolak resist change to CAR (Chemical Amplified Resist), PEB(Post Exposure bake) become the key factor of litho CDU control. For nano-node lithography, traditional CD measurement methodology looks meet the resolution limit of semiconductor component. CD-SEM is from top to bottom measurement, can not provide detail profile information. Unless use cross section method, or can not show the depth data. But this way need to damage wafer also waste a lot time. As the semiconductor technology development, optical scatterometry will be next generation of CD measurement. Currently, the key point of PEB temperature is hot plate thermal controller. But no matter how accurate of hot plate temperature control is, seem still not meet the CDU requirement of nano-lithography. Someone tried to calibrate the PEB temperature by using development CD, in order to make the within wafer CDU better. Whatever, these methods are using SEM by CD measurement. Still need lot measurement point and time for data accuracy. As the optical CD technology improve, the features of accuracy、quickly and more profile information maybe provide the new direction of PEB temperature calibration by development CD. In this paper, the feasibility of improving the within wafer CDU will be discuss by using integrated scatterometry. The target of the works are optical CD match with SEM and PEB temperature calibration by integrated scatterometry for within wafer CDU best.
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Yu, Da Yu, and 余大猷. "Research of Process Control in Producing the Brake Pump Housing by the EPC Process." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/45281146135870422533.
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Hsu, Wei-Yu, and 徐瑋佑. "Optimal Research of Automatic Generation Control for an Interconnected Power System." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/79706264503190189431.
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碩士中原大學
機械工程研究所
95
In this thesis, the theories of automatic generation control (AGC), which are the major components of generation management system, are discussed. In an interconnected system installed with the AGC modules, the role of the AGC is to instantaneously adjust the generation units so as to keep the power balance between sources and sinks. The generation status of power units under different control modes is monitored by AGC, which in the meantime can balance the needs both for the power consumption of internal controlled area and for the scheduled exchange Mega-Watt (MW) under the safety power dispatch. This study investigates the impact of an integral controller on the two area-power system. Controlled models used in this study are the thermal power plant and the hydro power plant. Generation Rate Constraint and their impacts on the variation of response are accounted for. Simulations of optimization using Simplex Method, Genetic Algorithm, Particle Swarm Optimization, and Linear Quadratic with the aim of reducing the area control error of the system to zero are used in this study. The simulated results obtained from this study indicate that for the system frequency, its transient response is small and its steady-state response converges to zero pu quickly.
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Lee, Chia-Tse, and 李佳澤. "Research on the Droop Control of Power Converters for Microgrid Applications." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90954172566809936975.
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Yeh, Ja-Ming, and 葉家銘. "Research and Development of Intelligent Power Management with DSP Control Unit." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/82945141400642553318.
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碩士國立中山大學
電機工程學系研究所
91
This thesis is to design an intelligent battery charger and residual capacity estimator with DSP. This system uses the proposed structure of the series circuit and battery equalizer with the intelligent fuzzy charge algorithm to charge battery, The internal resistance measurement can accurately estimate the residual capacity of battery. Because of using the intelligent fuzzy charge algorithm, it can give different charging current depends on voltage, capacity and temperature of battery. Because of using battery equalizer, it can adjust the voltage of battery to guarantee the battery be charged safely. According to experimental results, the charger can achieve the goal of fast and uniform charge within 6 to 8 hours. On the residual capacity estimator, We measure internal resistance to accurately estimate residual capacity of battery, because internal resistance is affected by environmental temperature, battery corrosion, aging factor and output current .
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Yang, Shu-Fen, and 楊淑芬. "Research of The Process of 90''s Journal and its power flow." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/86812876493203983721.
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