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Bahadornejad, Momen. "On-line local load measurement based voltage instability prediction." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16187/.
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Voltage instability is a major concern in operation of power systems and it is well known that voltage instability and collapse have led to blackout or abnormally low voltages in a significant part of the power system. Consequently, tracking the proximity of the power system to an insecure voltage condition has become an important element of any protection and control scheme. The expected time until instability is a critical aspect. There are a few energy management systems including voltage stability analysis function in the real-time environment of control centres, these are based on assumptions (such as off-line models of the system loads) that may lead the system to an insecure operation and/or poor utilization of the resources. Voltage instability is driven by the load dynamics, and investigations have shown that load restoration due to the on-load tap changer (OLTC) action is the main cause of the voltage instability. However, the aggregate loads seen from bulk power delivery transformers are still the most uncertain power system components, due to the uncertainty of the participation of individual loads and shortcomings of the present approaches in the load modeling. In order to develop and implement a true on-line voltage stability analysis method, the on-line accurate modeling of the higher voltage (supply system) and the lower voltage level (aggregate load) based on the local measurements is required. In this research, using the changes in the load bus measured voltage and current, novel methods are developed to estimate the supply system equivalent and to identify load parameters. Random changes in the load voltage and current are processed to estimate the supply system Thevenin impedance and the composite load components are identified in a peeling process using the load bus data changes during a large disturbance in the system. The results are then used to anticipate a possible long-term voltage instability caused by the on-load tap changer operation following the disturbance. Work on the standard test system is provided to validate the proposed methods. The findings in this research are expected to provide a better understanding of the load dynamics role in the voltage stability, and improve the reliability and economy of the system operation by making it possible to decrease uncertainty in security margins and determine accurately the transfer limits.
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Büchner, Stefan. "Energiemanagement Strategien für elektrische Energiebordnetze in Kraftfahrzeugen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1228736572957-56492.
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Die elektrische Energieform gewinnt im Kraftfahrzeug wegen ihrer Nutzungsvielfalt und sehr guten Steuerbarkeit für die Realisierung neuartiger Funktionen zunehmend an Bedeutung. Voraussetzung für ihren Einsatz ist eine zuverlässige und effiziente Bereitstellung durch das Kfz-Energiebordnetz. Dafür ist ein intelligentes Energiemanagement erforderlich, welches mit geeigneten Strategien die Leistungsflüsse im Energiesystem koordiniert. In dieser Arbeit werden die beiden Entwurfsziele der Zuverlässigkeit und der Effizienz bei der Entwicklung von elektrischen Energiemanagement-Strategien systematisch betrachtet. Es erfolgt eine Beschreibung und Zuordnung der einzelnen Ziele und Maßnahmen anhand der Energieflüsse und Wirkungsketten. Ein Schwerpunkt bildet dabei die Beherrschung von Lastwechseln im Bordnetz. Für Aussagen hinsichtlich einer effizienten Erzeugung elektrischer Energie erfolgt eine Untersuchung der Energiewandlungskette anhand analytischer Methoden und mit Hilfe einer simulationsgestützten Optimierung. Ein weiterer Fokus der Arbeit liegt in der Betrachtung zur Anwendung ökonomischer Modelle für eine Energiekoordination. Es werden die theoretischen Grundlagen der Mikroökonomie zusammengestellt und mögliche Funktionsstrukturen eines einseitigen und zweiseitigen Allokationsmechanismus verglichen und bewertet. Abschließend zeigen experimentelle Untersuchungen an einem Bordnetzprüfstand zum Lastwechselverhalten und die Integration eines Energiemanagement-Systems den praktischen Bezug zum realen System.
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Горенко, Дар’я Сергіївна. "Оцінювання обмінних процесів у локальних системах електропостачання з джерелами розосередженої генерації." Thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/32609.
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У дисертаційній роботі здійснено комплексний аналіз особливостей функціонування ЛСЕП з врахуванням сучасних вимог концепції Smart Grid та виконано співставний аналіз методів оцінки обмінних процесів у ЛСЕП з джерелами РГ. На основі експертного аналізу виділено основні проблеми роботи ЛСЕП у вітчизняних системах електропостачання та енергозабезпечення. Розширено відому систему ПЯЕ для адекватного оцінювання рівнів ЕМС в ЛСЕП з дотриманням вимог концепції Smart Grid та оцінювання рівнів перетоків енергії на основі відомих показників. Розроблено та апробовано спеціалізований програмний модуль та нормативно-методичне забезпечення розширеного енергетичного аудиту з використанням обмінної потужності, яке дає змогу: визначити обмінну потужність та частку взаємного впливу в довільному перетині ЛСЕП з врахуванням особливостей їх конфігурації, режимів роботи окремих елементів та ЛСЕП в цілому; отримати інформацію про обмінні процеси в ЛСЕП з різним рівнем інформаційного забезпечення; адекватно враховувати особливості протікання режимів у ЛЕС, зокрема, двонаправленість потоків електроенергії та визначити реальний їх розподіл в елементах ЛСЕП.In the dissertation the complex analysis of the peculiarities of functioning of local power supply systems (LPSS) is carried out taking into account the modern requirements of the Smart Grid concept and the comparative analysis of methods of estimation of exchange processes in LPSS with dispersed energy sources is performed. The need to extend the known LPSS system to adequately assess the EMC levels in the LPSS with the requirements of the Smart Grid concept and to estimate the energy flow rates using known indicators is justified. The analysis of exchange processes of LPSS under the influence of different types of impulse disturbances and sources of non-sinusoidal voltage and current caused by the peculiarities of modes of operation of both individual elements and the system as a whole for single and three-phase cross sections of LPSS is carried out. New relationships were obtained to evaluate the effect of non-sinusoidality and to take into account the ripple coefficients on the nature of the exchange processes. The analysis of the exchange processes in LPSS has been carried out taking into account the real characteristics of the elements with electromagnetic bonds (transformers, reactors, transmission lines, etc.) and new relationships have been obtained, which link the exchange power and the coefficients of magnetic coupling for one and three-phase LPSS operating in both sinusoidal and non-sinusoidal modes, as well as in symmetric and asymmetric modes. Regulatory and methodological support of the expanded energy audit with the use of exchange power was developed and tested. Regulatory and methodological support was used: for conducting an expanded energy audit at the enterprise of СE «Vasylkiv Leather Company» (Vasylkiv, Kyiv region); analysis of parallel operation of standby power supply systems both separately and in combination with the network used for powering server equipment of PLC «Prostonet»; was the basis for the course of lectures on discipline "Electrical Engineering Complexes", which will be taught in 2019 at Vasylkivsky College of NAU. A specialized software module and regulatory and methodological support for the extended energy audit using exchange power have been developed and tested. The proposed regulatory and methodological support makes it possible to: determine the exchange power and the proportion of mutual influence in an arbitrary intersection of LPSS, taking into account the peculiarities of their configuration, modes of operation of individual elements and LPSS as a whole; to obtain information on exchange processes in the LPSS with different levels of information support; to adequately take into account the peculiarities of the flow of modes in the LPSS, in particular, the bidirectionality of electricity flows and to determine their real distribution in the elements of LPSS.
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Eireiner, Matthias. "Power supply integrity in low power designs." Aachen Shaker, 2009. http://d-nb.info/99845642X/04.
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Zitouni, Salah. "An expert system for electric power system management." Thesis, University of Dundee, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338200.
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Song, Jian, Ni Luo, Liu Cao, and Min Xu. "An Evaluation System for Airplane's Power Supply." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596441.
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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVPower supply is the most critical unit in an airplane. A defect in a power supply might lead to a crash. Therefore, it is very useful and important to monitor the status of the airplane's power supply during flight. This paper presents a real-time evaluation system constructed by a central process unit for processing and detecting defects and several remote units for acquiring parameters. Because of the huge amount of data acquired, a combination of Ethernet and time division multiplexing technique has been applied for constructing a 2.5Gbps synchronous data transportation network for the system.
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Chan, Weng Hong. "Harmonic reduction and power factor correction in low power supply system." Thesis, University of Macau, 2002. http://umaclib3.umac.mo/record=b1445817.
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Biner, Dominik. "Power supply and motion system for planetary rover /." Sion, 2008. http://doc.rero.ch/record/10802?ln=fr.
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Hou, Anton, and Anders Haponen. "The power supply system for the MUSCAT experiment." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199316.
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Bidgol, Saman, and Viktor Granberg. "Power supply system for the ISAAC rocket experiment." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-199333.
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Reddy, Amarnath. "Expert system based switched mode power supply design." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/12842.
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The design of power electronic systems requires wide ranging expertise in complex and often tedious tasks, such as the design of the power circuit, selection of power semiconductor devices, design of the feedback loop, design of wound components, and design for Electromagnetic Compatibility (EMC). Many of the tasks rely heavily on the experience of the designer, and cannot be solved analytically. This makes the design iterative, time consuming, and heavily dependent on the designer's experience. At present, circuit simulation packages such as SPICE or SABER are used to test a design in software. Even with these tools, it is still necessary to build a prototype to verify the design, usually followed by several test-modify-retest cycles before a final design is reached. This process involves considerable decision making, which requires substantial expertise in all aspects of power electronics. This thesis investigates the use of expert system technology, one of many artificial intelligence techniques, to assist in the design of power electronic systems. Faster design times and a more efficient design are among the advantages that can be achieved using an expert system based design. In this study, Switched Mode Power Supplies have been chosen as a typical power electronic system. An expert system (developed using wxCLIPS) has been linked with a circuit simulator (SPICE), extensive databases and a graphical display system to provide a comprehensive design environment. The techniques used in the system cover all facets of the design: preliminary circuit design, component selection, circuit simulation, control loop design, and design for EMC. Extensive knowledge bases covering the various design rules are built into the expert system. The design methodology aims to give a near complete system design with an optimum configuration produced at minimum time and cost. The investigated techniques could readily be adapted to other power electronic applications, such as Uninterruptible Power Supplies and motor drives.
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Moskalenko, M. M., and V. V. Dulya-Borzenec. "Autonomous power supply for safety systems." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/49068.
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It is well-known that in mines for mining equipment supply is used the high voltage values (U = 1140/660 V). Besides, the safety system’s devices are based on chip components that used the spark-safe voltage of lesser of 5 V. Taking into account this fact, for automation systems supply a lot of companies produced the low-voltage power supplies. To convert the high-voltage into low-voltage are used transformers or high-voltage capacitors in pulsed power supplies. These devices have a significantly overall dimension and are needed to use a bulk explosion-safe protective covers. There is also difficult problem of the electro-magnetic pulses safety. These pulses are occurred while switching the electrical motors with power.
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Homon, Bohdan. "Combined power supply system converting unit with renewable sources." Thesis, Дніпропетровський національний університет залізничного транспорту ім. академіка В. Лазаряна, 2017. https://er.knutd.edu.ua/handle/123456789/9329.
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The article deals with the implementation of renewable energy sources in local electrical systems such as solar battery, wind turbines. The improvement and wide spread of the sources of distributed generation renewable energy sources is one of the ways to improve the energy security of the country.Стаття присвячена питанню впровадження відновлювальних джерел енергії (сонячна батарея, вітрові турбіни) в місцевих електричних системах. Покращення та широке розповсюдження поновлюваних джерел енергії розподіленої генерації є одним із способів підвищення енергетичної безпеки країни.
Статья посвящена вопросу внедрения возобновляемых источников энергии (солнечная батарея, ветровые турбины) в местных электрических системах. Улучшение и широкое распространение возобновляемых источников энергии распределенной генерации является одним из способов повышения энергетической безопасности страны.
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Дяченко, Олександр Васильович. "Розвиток методів знаходження часткової участі у відповідальності за порушення якості електроенергії." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35837.
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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи. Національний технічний університет "Харківський політехнічний інститут", Харків, 2018.
Дисертація присвячена розвитку методів визначення часткової участі суб'єктів розподілу і споживання електричної енергії (ЕЕ) в відповідальності за порушення якості електроенергії (ЯЕ) шляхом їх доповнення методами, які можна використовувати в локальних засобах обліку, а також розробці методу визначення часткової участі суб'єктів за показниками коливання напруги (КН). Аналіз методів детермінованого визначення часткової участі суб'єктів в відповідальності за порушення ЯЕ показав, що існують розроблені методи і методики по: симетрії напруги, синусоїдальності кривої напруги, сталому відхиленню напруги. У той же час відомі розробки в повному обсязі не вирішують завдання експлуатації електричних мереж і не охоплюють всі показники якості електроенергії (ПЯЕ), властиві тривалим відхиленням характеристик напруги від номінальних значень. Потрібно вирішити завдання побудови локального пристрою для визначення часткової участі споживачів у спотворенні симетрії, а також розробити методику визначенням відповідальності суб'єктів за порушення вимог до ЯЕ за показниками КН. Розроблено метод визначення місця розташування джерела КН в системі електропостачання. Отримав розвиток метод аналізу кривої напруги стосовно дискретної обробки інформації. Метод дозволяє виявляти й оцінювати локальні екстремуми, виділяти області монотонної зміни і незмінності кривої напруги. Отримав розвиток метод визначення відповідальності споживача і постачальника за спотворення симетрії напруги, заснований на розрахунку балансу ЕЕ по якій потрібно визначення відповідальності споживача за період моніторингу. Розроблено методики аналізу кривої зміни напруги, визначення місця знаходження джерела та часткової участі споживача у відповідальності за перевищення допустимого рівня КН, визначення часткової участі суб'єктів в порушенні симетрії локальної системи обліку споживання та контролю ЯЕ, комплексна методика визначення часткової участі споживача в відповідальності за порушення ПЯЕ.The thesis is for obtaining scientific degree candidate of technical sciences in specialty 05.14.02 – Electrical power stations, networks and systems. National Technical University "Kharkov Polytechnic Institute", Kharkov, 2018. Analysis of the methods of deterministic determination of the partial participation of subjects in the responsibility for violating the quality of electricity showed that there are developed methods and techniques for: voltage symmetry, sinusoidal voltage curve, constant voltage deviation. At the same time, known developments do not completely solve the problems of operation of electric networks and do not cover all the indicators of electricity quality, characterized by a long deviation of voltage characteristics from nominal values. It is necessary to solve the problem of constructing a local device to determine the partial participation of consumers in the distortion of symmetry, as well as develop a method of definition responsibility of subjects for violating the requirements for the quality of electricity in terms of voltage fluctuations. The method of determining the location of the source of voltage fluctuations in the power supply system is developed. Received the method of analysis of the voltage curve in relation to discrete processing of information. The method allows to detect and evaluate local extrema, to allocate areas of monotone change and invariance of the voltage curve. Developed a method for determining the responsibility of the consumer and supplier for the distortion of voltage symmetry, based on the calculation of the balance of electricity, which requires the definition of customer responsibility in the monitoring period. The methods of analysis of the voltage curve analysis, the determination of the location of the source and the partial involvement of the consumer in the responsibility for exceeding the permissible level of voltage fluctuations, the determination of the partial participation of the subjects in violation of the symmetry of the local system of consumption accounting and electricity quality control, a comprehensive method for determining the partial involvement of the consumer in liability for violating the quality of electricity.
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Lao, Keng Weng. "A novel electric traction power supply system using hybrid parallel power quality compensator." Thesis, University of Macau, 2011. http://umaclib3.umac.mo/record=b2550461.
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Spaulding, Jonathon David. "Power supply switching for a mm-wave asymmetric multilevel outphasing power amplifier system." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62479.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
This thesis demonstrates power switches to be used in our new Asymmetric Multilevel Outphasing (AMO) transmitter architecture at mm-wave frequencies. The AMO topology breaks the linearity vs. efficiency design objective in radio frequency power amplifiers (PAs) which has until now appeared to be fundamental. These power switches allow for the modulation of the PA supply rail between four discrete levels at a maximum sampling rate of 2 GHz. This modulation results in a higher average system efficiency by reducing the outphasing angle between the phase paths. This work was designed in a 130-nm SiGe BiCMOS process.
by Jonathon David Spaulding.
M.Eng.
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Ferdoush, Md Asif. "System Stability of the Overhead Power Supply System used in the Electric Road System." Thesis, Scania CV AB, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-399815.
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This thesis presents the stability analysis of an Electric Road System (ERS), which is often abbreviated as eHighway, used for the electrification of the hybrid vehicle. The overall system modelling of the ERS, starting from the sub-station to the critical part of the Scania hybrid truck is performed in the MATLAB Simulink environment. The ERS consists of an overhead catenary line (OCL), where vehicles are electrified by using a pantograph mounted over the vehicle. The stability analysis of the power supply of the overhead line is done by taking into account several aspects of the system. The simulation results are validated with the real test track measurements and the deviations are shown. The frequency response of the system is considered to measure the stability margin. The resonance conditions are clarified and essential variable choke is proposed to damp them out. Also the harmonic components injected from the vehicle side, that are in the closer range of the resonance, are figured out and filtered. When multiple vehicles are electrified from the same catenary line, then there are interferences in between the vehicles. These disturbances both to the vehicles and the overhead power supply system are presented in the time domain. Finally, the results are shown to demonstrate the effectiveness of the variable choke to increase the stability margin in the overhead supply system. In the frequency domain results, it has shown that the resonance is shifted out of the system operating frequency. In the time domain results, it has shown that the high amplitude of the current and voltage signals are sufficiently damped out by variable choke implementation.
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Дяченко, Олександр Васильович. "Розвиток методів знаходження часткової участі у відповідальності за порушення якості електроенергії." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35835.
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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.14.02 – електричні станції, мережі і системи. Національний технічний університет "Харківський політехнічний інститут", Харків, 2018.
Дисертація присвячена розвитку методів визначення часткової участі суб'єктів розподілу і споживання електричної енергії (ЕЕ) в відповідальності за порушення якості електроенергії (ЯЕ) шляхом їх доповнення методами, які можна використовувати в локальних засобах обліку, а також розробці методу визначення часткової участі суб'єктів за показниками коливання напруги (КН). Аналіз методів детермінованого визначення часткової участі суб'єктів в відповідальності за порушення ЯЕ показав, що існують розроблені методи і методики по: симетрії напруги, синусоїдальності кривої напруги, сталому відхиленню напруги. У той же час відомі розробки в повному обсязі не вирішують завдання експлуатації електричних мереж і не охоплюють всі показники якості електроенергії (ПЯЕ), властиві тривалим відхиленням характеристик напруги від номінальних значень. Потрібно вирішити завдання побудови локального пристрою для визначення часткової участі споживачів у спотворенні симетрії, а також розробити методику визначенням відповідальності суб'єктів за порушення вимог до ЯЕ за показниками КН. Розроблено метод визначення місця розташування джерела КН в системі електропостачання. Отримав розвиток метод аналізу кривої напруги стосовно дискретної обробки інформації. Метод дозволяє виявляти й оцінювати локальні екстремуми, виділяти області монотонної зміни і незмінності кривої напруги. Отримав розвиток метод визначення відповідальності споживача і постачальника за спотворення симетрії напруги, заснований на розрахунку балансу ЕЕ по якій потрібно визначення відповідальності споживача за період моніторингу. Розроблено методики аналізу кривої зміни напруги, визначення місця знаходження джерела та часткової участі споживача у відповідальності за перевищення допустимого рівня КН, визначення часткової участі суб'єктів в порушенні симетрії локальної системи обліку споживання та контролю ЯЕ, комплексна методика визначення часткової участі споживача в відповідальності за порушення ПЯЕ.The thesis is for obtaining scientific degree candidate of technical sciences in specialty 05.14.02 – Electrical power stations, networks and systems. National Technical University "Kharkov Polytechnic Institute", Kharkov, 2018. Analysis of the methods of deterministic determination of the partial participation of subjects in the responsibility for violating the quality of electricity showed that there are developed methods and techniques for: voltage symmetry, sinusoidal voltage curve, constant voltage deviation. At the same time, known developments do not completely solve the problems of operation of electric networks and do not cover all the indicators of electricity quality, characterized by a long deviation of voltage characteristics from nominal values. It is necessary to solve the problem of constructing a local device to determine the partial participation of consumers in the distortion of symmetry, as well as develop a method of definition responsibility of subjects for violating the requirements for the quality of electricity in terms of voltage fluctuations. The method of determining the location of the source of voltage fluctuations in the power supply system is developed. Received the method of analysis of the voltage curve in relation to discrete processing of information. The method allows to detect and evaluate local extrema, to allocate areas of monotone change and invariance of the voltage curve. Developed a method for determining the responsibility of the consumer and supplier for the distortion of voltage symmetry, based on the calculation of the balance of electricity, which requires the definition of customer responsibility in the monitoring period. The methods of analysis of the voltage curve analysis, the determination of the location of the source and the partial involvement of the consumer in the responsibility for exceeding the permissible level of voltage fluctuations, the determination of the partial participation of the subjects in violation of the symmetry of the local system of consumption accounting and electricity quality control, a comprehensive method for determining the partial involvement of the consumer in liability for violating the quality of electricity.
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Rahmat, Mohd Khairil. "Methods for reliability analysis of uninterruptible power supply (UPS) system." Thesis, University of Strathclyde, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444418.
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Andersson, Tobias, and Jonathan Toft. "Data communication and power supply on a two conductor system." Thesis, Uppsala universitet, Elektricitetslära, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-359781.
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This master thesis aimed to develop a prototype of a hardware platform which allowed digital communication as well as DC power to be transmitted over one pair of wires. The prototype was used as a pre-study for Axis Communications AB that wanted a bit rate high enough to transmit digital audio, as well as enough power to supply a set of speakers. The prototype included one circuit to send power and data (master), as well as two receivers (slaves). With this configuration data rates of up to 17 Mbps were achieved as well as an output power of 90 W from master. The data was transmitted on a RS-485 bus type, which was AC coupled to a 48 V DC bias. Because of the AC coupling, the bit stream needed to alternate, therefore Manchester encoded data, or similar, was recommended. The receiver cards included a buck converter to supply the circuits with a stable 5 V DC. The converters needed at least 10 V supply voltage to function, which gave a theoretical max range in cabling when accounting for voltage drop in the cables. For a 0.75 mm² power cord at max allowed current, this range was 500 metres per wire.
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Jiang, Zhen. "Proposed Improvements to the Neutral Beam Injector Power Supply System." Miami University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=miami150187797853065.
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Dahl, Ferdinand Meltzer. "Interconnection of an Isolated Power System to an External Power Supply : - Dimensioning, modelling and control." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26771.
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In this master thesis, a possible solution on how to connect a jack-up rig to an external supply was proposed. Using a conceptual layout of a typical jack-up rig power system as the basis, a suitable solution was proposed. The solution consists of a three winding transformer, and a frequency changer consisting of a twelve pulse rectifier and a voltage source converter. The frequency changer was needed because of the different frequencies on the supply and jack-up rig systems. In addition, filters, and a simple overcurrent protection relay were designed. After presenting the theoretical basis for the design of the components, a model was made in Matlab/Simulink to test and verify the solution. It was assumed that the external supply was a stiff network, and the external supply was therefore modelled as a voltage source. The external supply supplies the jack-up rig through a sub-sea cable with voltage of 36 kV and frequency of 50 Hz. A simple RL equivalent was used to model this based on a suitable cable from Nexans. The twelve-pulse rectifier model was made using two premade six-phase rectifiers in Simulink connected in series. This to minimize DC link ripple. The DC link filter was dimensioned analytically with respect to allowed current and voltage ripple and the resulting values were inductance, L = 13.63 mH and, capacitance, C = 1.2 mF. A two level voltage source converter was used to convert DC to AC at the desired 60 Hz frequency. The control system was based on proven methods using a cascaded control structure with an outer voltage control loop, and an inner current control loop. The control was performed in the d-q reference frame allowing the use of PI controllers. These were tuned using the pole placement technique. The inverter output filter was tuned to attenuate the dominant inverter induced harmonics. A cut-off frequency of ω_o= 1257 [rad/s], with inductance, L = 6.3 mH, and capacitance, C = 100.36 µF proved to give good attenuation. All steady state simulations proved successful with respect to harmonic distortion, voltage level and frequency. The largest load side THD was the current THD on the HV switchboard. This was 0.59 %. The supply line current THD at nominal load was 9.28 % due to the twelve pulse rectifiers and the lack of a filter. During simulations of different load scenarios, step changes in load caused a maximum voltage dip of 20 V, and a current overshoot in one of the phases of about 1500 A. Using a linear ramp load instead, with a change in load power, dP/dt = ± 6 MW/s, and reactive power change, dQ/dt = ± 4 MVAr/s the supply followed perfectly, without any transients. Fault simulations were done with a three-pole short circuit on different places on the jack-up AC side, and a bolted pole-to-pole short circuit of the DC link. None of the faults at the load islands caused any overcurrent in the interconnection. The largest being 159.2 kA at the inverter terminals. The initial peak fault currents during jack-up AC side fault simulations was caused by the inverter filter capacitors. A short circuit of the inverter switches proved critical. This yielded a peak fault current of 747 kA, and would destroy the inverter switches. The short circuit on the DC link had a peak current of 23 kA, and would probably destroy the rectifier diodes. The overcurrent protection relays used proved successful in interrupting the fault currents, and selectivity was maintained. Studying the results, it is apparent that the proposed solution works during normal operation, but that a multilevel converter should be used instead to minimize filter capacitors and thereby peak fault currents.
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Zhao, Yu. "Reverse osmosis desalination in a mini renewable energy power supply system." Curtin University of Technology, Dept. of Electrical and Computer Engineering, 2006. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=18552.
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The design, construction and testing of a reverse-osmosis (PV-RO) desalination system for fresh water shortage area is presented. The system operates from salt water or brackish water and can be embedded in a renewable energy power supply system, since many fresh shortage areas are remote and isolated. Special attention is given to the energy efficiency of small-scale reverse osmosis desalination systems. Limitations of conventional control strategy using toggle control are presented. Based on this, an objective of creating a small-scale reverse osmosis desalination system was set out. Initially, the background information is presented. This includes the natural resources crisis and main desalination technologies and the viability of the integration with renewable energy source. A reverse osmosis (RO) desalination system was assembled and set up at the Curtin University of Technology, Perth, Western Australia Supervisor Control And Data Acquisition (SCADA) system was built using a Human Machine Interface software and a programmable logic controller (PLC). Instrumentation that included signal conditioners was made in analysis of the system characteristics. Initial testing of the system was conducted after the system design and configuration was accomplished. Testing results were used as a guideline for the development of the whole system.Modelling and simulation of the system components in MATLABSimulink is presented, together with a discussion of the control systems modelling and design procedure, in which the aim was to improve the efficiency of the reverse osmosis system. Simulations show the designed reverse osmosis system with Proportional Integral and Derivative (PID) controller has better performance than other controllers. This consequently leads to a lower overall cost of the water, as well as reducing full maintenance cost of the electric drives in the reverse osmosis unit. Additionally, the configuration of the remote control system through General Package Radio System (GPRS) network is depicted. After the PID control algorithm was programmed into the Programmable Logic Controller (PLC), system experiments were carried out in short durations and long durations. System performance was monitored and experimental results prove that the new control strategy applied increase the water productivity and is able to improve the system efficiency up to 35%. Based on the data obtained from the simulations and experiments, Mundoo Island was chosen to be the location for a case study. The electric load profile of the island was derived from the Island Development Committee in Mundoo.
A water demand profile was created and modelled in Matlab to be the input of the reverse osmosis system. The electric load of the reverse osmosis system was generated from Matlab simulation. This result was entered in Hybrid Optimisation Model for Electric Renewables (HOMER) simulator. Having the designed RO unit as one of the electric loads, the entire remote area power supply (RAPS) system was tested in simulations which shows the energy cost is AUS$0.174 per kWh, lower than the Island Development Committee budget estimation of AUS$0.25 per kWh. The cost of the water treatment is very promising at AUS$0.77 per m3.
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Cheng, Limin. "A universal controller for a single-phase uninterruptible power supply system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ42361.pdf.
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Allinson, Johanne Claire. "Supply linkages and power relations in the UK agro-food system." Thesis, Northumbria University, 2004. http://nrl.northumbria.ac.uk/951/.
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Li, Qiong. "Developing Modeling and Simulation Methodology for Virtual Prototype Power Supply System." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/27462.
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This dissertation develops a modeling and simulation methodology for design, verification, and testing (DVT) power supply system using a virtual prototype. The virtual prototype is implemented before the hardware prototyping to detect most of the design errors and circuit deficiencies that occur in the later stage of a standard hardware design verification and testing procedure. The design iterations and product cost are reduced significantly by using this approach.
The proposed modeling and simulation methodology consists of four major parts: system partitioning, multi-level modeling of device/function block, hierarchical test sequence, and multi-level simulation. By applying the proposed methodology, the designer can use the virtual prototype effectively by keeping a short simulation CPU time as well as catching most of the design problems.
The proposed virtual prototype DVT procedure is demonstrated by simulating a 5 V power supply system with a main power supply, a bias power supply, and other protection, monitoring circuitry. The total CPU time is about 8 hours for 780 tests that include the basic function test, steady stage analysis, small-signal stability analysis, large-signal transient analysis, subsystem interaction test, and system interaction test. By comparing the simulation results with the measurements, it shows that the virtual prototype can represent the important behavior of the power supply system accurately. Since the proposed virtual prototype DVT procedure verifies the circuit design with different types of the tests over different line and load conditions, many circuit problems that are not obvious in the original circuit design can be detected by the simulation.
The developed virtual prototype DVT procedure is not only capable of detecting most of the design errors, but also plays an important role in design modifications. This dissertation also demonstrates how to analyze the anomalies of the forward converter with active-clamp reset circuit extensively and facilitate the design and improve the circuit performances by utilizing the virtual prototype. With the help of the virtual prototype, it is the first time that the designer is able to analyze the dynamic behavior of the active-clamp forward converter during large-signal transient and optimize the design correspondingly.Ph. D.
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Zhou, Qinsheng. "Integrative Power Supply Solution for Future Generation Vehicles." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-180331.
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Abstract: How to secure the power supply for future generation vehicles is an open question. This thesis uses Web-HIPRE as a tool of Decision Support System to predict the main compositions of future generation vehicles and also analyzes the advantages and shortages of currently existing solutions. The method of system approach is utilized to find out common problems of those existing solutions and to form an integrative solution. A model for this integrative solution is built under PowerSIM environment and the main objective of the model is to simulate the energy balance between power supply and demand. Finally, a brief discussion mainly focuses on the social and economic impact of the solution is made under PEBOSCA framework.
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Abrahamsson, Lars. "Optimal Railroad Power Supply System Operation and Design : Detailed system studies, and aggregated investment models." Doctoral thesis, KTH, Elektriska energisystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107037.
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Railway power supply systems (RPSSs) differ mainly from public power systems from that the loads are moving. These moving loads are motoring trains. Trains can also be regenerating when braking and are then power sources. These loads consume comparatively much power, causing substantial voltage drops, not rarely so big that the loads are reduced. By practical reasons most RPSSs are single-phase AC or DC. Three-phase public grid power is either converted into single-phase for feeding the railway or the RPSS is compartmentalized into separate sections fed individually from alternating phase-pairs of the public grid. The latter is done in order not to overload any public grid phase unnecessarily much. This thesis summarizes various ways of optimally operating or designing the railway power supply system. The thesis focuses on converter-fed railways for the reasons that they are more controllable, and also has a higher potential for the future. This is also motivated in a literature-reviewing based paper arguing for the converter usage potential. Moreover, converters of some kind have to be used when the RPSS uses DC or different AC frequency than the public grid. The optimal operation part of this thesis is mainly about the optimal power flow controls and unit commitments of railway converter stations in HVDC-fed RPSSs. The models are easily generalized to different feeding, and they cope with regenerative braking. This part considers MINLP (mixed integer nonlinear programming) problems, and the main part of the problem is non-convex nonlinear. The concept is presented in one paper. The subject of how to model the problem formulations have been treated fully in one paper. The thesis also includes a conference article and a manuscript for an idea including the entire electric train driving strategy in an optimization problem considering power system and mechanical couplings over time. The latter concept is a generalized TPSS (Train Power Systems Simulator), aiming for more detailed studies, whereas TPSS is mainly for dimensioning studies. The above optimal power flow models may be implemented in the entire electric train driving strategy model. The optimal design part of this thesis includes two aggregation models for describing reduction in train traffic performance. The first one presented in a journal, and the second one, adapted more useful with different simulation results was presented at a conference. It also includes an early model for optimal railway power converter placements. The conclusions to be made are that the potential for energy savings by better operation of the railway power system is great. Another conclusion is that investment planning models for railway power systems have a high development potential. RPSS planning models are computationally more attractive, when aggregating power system and train traffic details.QC 20121206
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Schmidt, Uwe. "Uninterruptible power supply system using a dual converter in quasi-resonant mode." Thesis, Brunel University, 1995. http://bura.brunel.ac.uk/handle/2438/5410.
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Uninterruptible Power Supply (UPS) systems have become a standard to protect electronic devices such as servers and host computers. Also, the energy supply of whole buildings is linked with large UPS systems to ensure a steady power flow. Two system configurations are widely used which differ in price and their ability to protect very sensitive load. This thesis illustrates an analytical examination of all existing systems and concludes with the finding of new configurations with increased efficiency and reduced costs. A dual converter is proposed as the heart of the new UPS system. This converter links the necessary two sources of the UPS through a common transformer. The transformer operates at a high frequency which is enabled due to the resonant switching technique used. The results of this paper were achieved using mathematical analysis, electrical and electro-magnetic simulation as well as by experiments carried out on the self designed circuit boards in the laboratory. These boards were built in a modular way to enable series testing and thereby optimise the dimensioning of the system.
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Smilek, Jan. "Energy Harvesting Power Supply for MEMS Applications." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-386765.
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Tato práce se zabývá vývojem nezávislého elektrického zdroje pro moderní nízkopříkonové elektrické aplikace. Protože tradiční řešení napájení drobných spotřebičů s využitím baterií či akumulátorů snižuje uživatelský komfort kvůli potřebě pravidelné údržby, navrhovaný zdroj využívá principu energy harvesting. Tento princip spočívá v získávání energie přímo z okolního prostředí napájené aplikace a její přeměně na energii elektrickou, která je dále využita pro na-pájení moderních MEMS (mikroelektromechanických) zařízení. Potenciální aplikací vyvíjeného zdroje je především moderní nositelná elektronika a biomedicínské senzory. Tato oblast využití ovšem klade zvýšené nároky na parametry generátoru, který musí zajistit dostatečný generovaný výkon z energie, dostupné v okolí lidského těla, a to při zachování prakticky využitelné velikosti a hmotnosti. Po stanovení předběžných požadavků a provedení analýz vhodnosti dostupných zdrojů energie ke konverzi byla k využití vybrána kinetická energie lidských aktivit. Byla provedena série měření zrychlení na lidském těle, především v místě předpokládaného umístění generátoru, aby bylo možno analyzovat a generalizovat hodnoty energie dostupné ke konverzi v daném umístění. V návaznosti na tato měření a analýzy byl vyvinut inovativní kinetický energy harvester, který byl následně vyroben jako funkční vzorek. Tento vzorek byl pak testován v reálných podmínkách pro verifikaci simulačního modelu a vyhodnocení reálné použitelnosti takového zařízení. Kromě samotného vývoje generátoru je v práci popsán i originální způsob zvýšení generovaného výkonu pro kinetické energy harvestery a jsou prezentována statistická data a modely pro predikci využitelnosti kinetických harvesterů pro získávání energie z lidské aktivity.
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Duvnjak, Zarkovic Sanja. "Security of Electricity Supply in Power Distribution System : Optimization Algorithms for Reliability Centered Distribution System Planning." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281813.
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The importance of electricity in everyday life and demands to improve the reliability of distribution systems force utilities to operate and plan their networks in a more secure and economical manner. With higher demands on reliability from both customers and regulators, a big pressure has been put on the security of electricity supply which is considered as a fundamental requirement for modern societies. Thus, efficient solutions for reliability and security of supply improvements are not just of increasing interest, but also have significant socio-economic relevance. Distribution system planning (DSP) is one of the major activities of distribution utilities to deal with reliability enhancement. This thesis deals with developing optimization algorithms, which aim is to min- imize customer interruption costs, and thus maximize the reliability of the system. This is implemented either by decreasing customer interruption duration, frequency of customer interruptions or both. The algorithms are applied on a single or multi- ple DSP problems. Mixed-integer programming has been used as an optimization approach. It has been shown that solving and optimizing each one of the DSP problems contributes greatly to the reliability improvement, but brings certain challenges. Moreover, applying algorithms on multiple and integrated DSP problems together leads to even bigger complexity and burdensome. However, going toward this inte- grated approach results in a more appropriate and realistic DSP model. The idea behind the optimization is to achieve balance between reliability and the means to achieve this reliability. It is a decision making process, i.e. a trade-off between physical and pricing dimension of security of supply.QC 20200925
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Pipattanasomporn, Manisa. "A Study of Remote Area Internet Access with Embedded Power Generation." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/30267.
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This study presents a methodology and the necessary analytical tools to evaluate the alternatives to provide Internet access with embedded power generation in remote areas. The objective is to provide a screening tool for policy makers to analyze possible telecom and power alternatives. Results from the study demonstrate the technical alternatives to providing sustainable Internet and power access. The dissertation investigates innovative telecom technologies currently available on the market, and develops a model that generates a Telecom-and-Internet access map of a region or a small country. The map illustrates the combination of technologies and their locations that can provide wide-area Internet access to cover a majority of the population at the least cost. The model then looks at the design of a small-scale power system for a remote location where grid power is unavailable or unreliable. The methodology takes into account locally available energy resources, technical and economic parameters of each power generating technology, and the trade-off among investment costs, environmental costs and system robustness. Lastly, a computer simulation is conducted to verify that the power system design has the ability to meet the demand at the level of required reliability.
A remote area of a developing country (Chittagong and Chittagong Hill Tracts - Bangladesh) is selected as a case study. Several scenarios are simulated in order to explore the possibility of extending the reach of the Internet and electric power to the remote area, and to conceptualize pilot projects as building blocks to build a countrywide infrastructure. Since the selected area is one of the least developed and most difficult to access in Bangladesh, demonstrating that the Internet and local power access can be provided to this area can serve as a model for similar places around the world.Ph. D.
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Skogberg, Ronny. "Railway power supply system models for static calculations in a modular design implementation." Thesis, KTH, Elektriska energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170726.
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Several previous theses and reports have shown that voltage variations, and other types of supply changes, can influence the performance and movements of trains. As part of a modular software package for railway focused calculations, the need to take into account for the electrical behavior of the system was needed, to be used for both planning and operational uses. In this thesis, different static models are presented and used for train related power flow calculations. A previous model used for converter stations is also extended to handle different configurations of multiple converters. A special interest in the train type IORE, which is used for iron ore transports along Malmbanan, and the power systems influence to its performance, as available modules, for mechanical calculations, in the software uses the same train type. A part of this project was to examine changes in the power systems performance if the control of the train converters were changed, both during motoring and regenerative braking. A proposed node model, for the static parts of a railway power system, has been used to simplify the building of the power system model and implementation of the simulation environment. From the results it can be concluded that under normal conditions, for the used train schedule, the voltage variation should not restrict the trains traction performance. It can also be seen from the results that a more optimized power factor control with a higher regenerative brake power or generation of reactive power could be used to limit the need for investments in infrastructure or to increase the traffic for a given system layout.I ett flertal tidigare undersökningar och rapporter har konstaterats att spänningsvariationer, och andra förändringar, hos strömförsörjningen till tåg kan påverka dess prestanda och dess färd längs rälsen. Som en del av ett modulärt programpaket för tågrelaterade beräkningar uppstod därför ett behov av elkraftsberäkningar, både för planering och operativ drift. I denna rapport sammanställs och används ett antal olika statiska modeller för tågrelaterade effektflödesberäkningar. Modellen för omformarstationer har även utökats för att hantera konfigurationer då olika typer av omformare används. Ett särskilt intresse för tågtypen IORE, som används för malmtransporter längs Malmbanan, och dess påverkan av en förändrad strömförsörjning, har funnits då olika typer av mekaniska beräkningar för denna tågtyp utförs i andra befintliga moduler. En del av projektet bestod i att undersöka förändringar i elförsörjningen, på grund av en ändrad styrning av tågens omformare, både vid återmatning och motordrift. En föreslagen nodmodell för den statiska delen av elnätet har använts för att förenkla elsystemsmodellen och uppbyggnaden av simuleringsmiljön. Av resultaten från simuleringarna kan man anta att under normala förhållanden, och med det använda körschemat, bör ej spänningen vara en begränsande faktor för tågens drift. Övriga simuleringar visar också att en mer optimerad effektfaktor för högre återmatad bromseffekt eller för generering av reaktiv effekt kan användas för att slippa investeringar i infrastrukturen, eller för att utöka trafikmängden för ett givet system.
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周加昇. "Power supply automated test system." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8tg9vs.
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碩士聖約翰科技大學
電機工程系碩士在職專班
104
In this paper, power supply automated test system is designed by Labview software. The main purpose is to perform electrical tests of power supply by program, and to turn the test results into a relevant test report. This research has the following advantages: (1)decrease test time. (2) shorten test steps, improve test accuracy and reduce human errors.(3) set up the program conveniently. (4) the system provides operational history for debug.This paper has been proved by experience: under the same power supply test items, compared with manual test time, this automated system test time is reduced by 40%~50% approximately. It can make it convenient for tester schedule arrangements. The automation test system settings are simple; you only need to set up the relevant test conditions, then the system can perform the tests and automatically turn the results into a test report. In addition, the report provides a recording function for debug, so that testers can have the debug history for the relevant tests; successors can refer to the history, effectively avoiding the time of studying all over again. The automated test system has the advantages of standardizing tests, increasing productivity, and reducing costs. Currently, it has become a trend that automated tests are gradually replacing manual tests. In this paper, the Labview diagram-controlling program (which is based on diagram programming language) can let users perform device control and test data retrieving more quickly, compared with traditional character programming language.
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Zhang, Yu-Jia, and 張育嘉. "Study of Retired Battery Power Supply System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/uvmgu4.
Full textAbstract:
碩士國立彰化師範大學
電機工程學系
107
With the rapid development of electric vehicles, the number of retired batteries is increasing day by day, and these retired batteries can be converted into fixed-type battery energy storage systems for green energy applications. However, the difference in capacitance between the retired batteries is significantly greater than that of the new batteries, so a robust battery management system is necessary to ensure the safe and normal operation of retired batteries, and to make sure the battery pack can supply the current required by the load. Thus, this thesis proposes the concept and technology of battery weakness-tolerance to achieve the retired battery power supply system. In order to verify the feasibility of the proposed system, a240W prototype is designed and completed, and two 12V/55AH lead-acid batteries are used to assess performance. Experimental results show that the realized prototype can ensure that the battery pack can supply the current required by the load within the defined tolerance index, which verifies the feasibility of the proposed method.
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JIANG, MING-DONG, and 江銘棟. "A Study of Contactless Power Supply System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/77613914986659212271.
Full textAbstract:
碩士南臺科技大學
電機工程系
104
This thesis presents an inductive contactless power transfer system which includes a full-bridge converter, a resonant circuit and a bridge rectifier filter circuit. The full-bridge circuit serves as the transmitter circuit in the system. Since the electromagnetic induction coils are loosely coupled with a very low coupling coefficient, it is necessary to add resonant capacitor on the two sides of the coils for impedance matching. This research adopts the SP compensation circuit as impedance matching. S represents a coil in series with the compensation capacitor. P represents a coil and the related compensation capacitor parallel connected. Alternating magnetic field of the coil on the primary side is generated by current flowing through the coil. The coil on the secondary side receives power from that on the primary side which is based on the principle of magnetic induction. The power received by the coil on the secondary side enters the rectifier/filter circuit and is output to the load. In this paper, phase shift pulse width modulation control and variable- frequency control are used and compared. Both the methods include voltage loop and current loop which making inductive contactless power transfer system control completed. Final, A prototypical of contactless power transfer system, which has 15 cm distance between two coils, 200V input voltage, 48V output voltage, and 500W output power is settled to verify the proposed control idea. Keyword: Wireless charger、Wireless power transfer、contactless power transfer
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Tsao, Chun-Ming, and 曹俊銘. "An FPGA Based Uninterruptible Power Supply System." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/00743975209337731996.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
94
This thesis proposes an uninterruptible power supply (UPS) system with digital and analog controller to realize this system. The DC/AC inverter uses a field-programmable gate array (FPGA) as a controller to achieve the digital pulse-width-modulation (PWM) control. Then, the verilog hardware description language (VHDL) is used to write the control procedures and ISE6.3 is served as the software development platform to perform syntax testing. Furthermore, the power factor correction (PFC) circuit, the charge circuit, and the spare power circuit are controlled by analog circuits. In addition, the FPGA is used to control the battery charge and spare power circuits. Under the normal utility-line power supply condition, the boost PFC circuit provides DC bus voltage the load and also maintain battery at the highest capacity. While the utility-line power is abnormally interrupted, the batteries supply the energy for the inverter to maintain a stable AC voltage supply for the load system. Finally, a 600W UPS system is implemented to verify the functionalities of the proposed designs.
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Cheng, Cheng-Yan, and 鄭裎諺. "Stackable power supply system for automatic guided vehicles." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b6vv24.
Full textAbstract:
碩士國立中央大學
機械工程學系
105
The purpose of the thesis is to design the power system of the Automated Guided Vehicle. We use Li- ion battery as a power source, and series six Li-ion batteries as one Li-ion battery package. It can also series different Li-ion battery packages to supply different voltage for use. Meanwhile, we complete electricity measurement, charge process management, and dispatch the power for the power system. The power system uses open circuit voltage with Coulomb Counting Method to measure the electricity, balance Li-ion batteries power by discharge to lengthen life cycle and use appropriate charge process management according to the different voltage of Li-ion batteries. We also design various protected circuits to confirm the safety of using power. The power system can use in different needs by different configuration. We design power supply management, charge process management, and dispatching power experiment in the experiment design chapter in the thesis to confirm the feasibility of the system.
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Wen, Jun-Hong, and 溫峻宏. "Wall Plug-in Power Supply System for AGV." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04303430977065153352.
Full textAbstract:
碩士大同大學
機械工程學系(所)
96
The purpose of this study is to design a self-propelled system which connects itself to an electric socket by directing automatic machinery to search and locate the socket on the wall based on image processing technology. The body of this system contains one Microchip PIC18F452 microcontroller as the core of the matter, a self-propelled unit made of two Stepping Motors, two mechanical arms, six infrared distance measured sensors which have 10-80 cm of detection distance, one CMOS webcam with 640x480 resolution, and four batteries supporting 6 hrs of operative time. The tracked target of this system is a regular electric socket on the wall. The man-machine interface is written by Borland C++ Builder, which principally processes the image and communication. The image of the electric socket on the wall is captured by CMOS camera and processed by image processing program to direct self-propelled unit of the system for approaching the socket. The body of this system moves toward and paralleled the wall until the distance to the wall is setting cm followed by plugging the plug into the electric socket by mechanical arms. This study successfully developed a self-propelled system which can be used in different environment and can search a regular socket for automatically charging itself.
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Lu, Ching-nan, and 盧慶南. "Supply Chain Management for EPC Project-A MRT Power Supply System Case Study." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/429xn9.
Full textAbstract:
碩士國立臺灣科技大學
工業管理系
102
Industry factory construction such as refinery, power plant and modern office building, macro shopping mall, it happened that operation schedule were delayed due to improper selection of supply chain. However, construction of MRT, supply chain is directly related with public transportation, which in connection with everyone’s life at present civilization society. How to adopt the most optimum strategy is a key issue for the project supply chain. This study is based on development of an assumed SIGMA corporation, its contract from small scale to large scale, and from local to globalization project of MRT power supply system. During the period, SIGMA corporation is encountering the difficulties. This study introduce the management theory of organization parageneis and independent to solve problems. To aim final target of project completion are settled on schedule with expected qualification, this thesis is also introduced concept of project management to establish the structure of supply chain resource series for MRT power supply system. From the beginning of subcontractor period, through intermediary channel agent period, joint venture period and international league period to study engineering, procurement and construction in connection with supply chain management.
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Chen, Wei Lun, and 陳韋倫. "Realization Of Power Supply to the LabVIEW Monitoring System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/97065090556876696703.
Full textAbstract:
碩士長庚大學
商管專業學院碩士學位學程在職專班資訊管理組
102
Electronic load is able to measure the relationship between voltage and current of Power Supply under no load or max load. It also verifies the in-put/output voltage, input current, and input/output power to satisfy Cli-ent’s demands. This can verify the integrity of functions of power supply. LabVIEW is the widest use in this industry. LabVIEW is the earliest developed and well-developed. It combines the two concepts of Structured and Functional Programing. This system uses the capability of operation and display of ordinary computers. That makes the users to set up their monintor system with the cheap computer hardware. This article utilizes LabVIEW, virtual instrument control software, to apply electronic load monitoring system to power supply. Brand C monitor system, which was adopted by our company, has the measurement deviation of power. In addition, it cannot be replaced by the same measurement equipment of our customers. If we depend on the manual measurement by RD, it takes a lot of man-hour and generates error of measurement data, resulting from artificial mistake of RD’s transcription. Therefore, the monitoring system, proposed on this article, not only provides Graphical User Interface for RD’s convenience, but also adopts the same measurement equipment with our customers’ to build up the same environment. This would improve the RD’s capability of measurement and verification.
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HUANG, CHUNG-CHENG, and 黃崇誠. "Development of power management and supply system of CubeSat." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/b8d7vc.
Full textAbstract:
碩士國立中央大學
光機電工程研究所
102
The study design of a complete power management and supply system for cubic satellite , using secondary lithium batteries and super capacitor as a power storage element in the satellites, and with the use of solar power charging module supplement provides cubic satellite computer and scientific payload set the required power use, and with input overvoltage protection and overload protection to prevent accidental damage to the system, and equip the communication interface for controlling of each power channel . After completing the circuit and mechanism design, functionality and performance of the power system is also be verified.
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HSIEH, CHIH-CHANG, and 謝志昌. "Design and Implementation of 1kW PFC system power supply." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/mbbkkd.
Full textAbstract:
碩士國立高雄應用科技大學
電子工程系
105
Power factor correction(PFC) has been widely used to increase the efficiency of power transmission, especially, in the modern Green Power era. Most electromechanical machines are inductive load. This causes a non-zero difference between the phases of current and voltage and leads to power factor smaller than one, which means that the effective power would be smaller than the apparent power. In other words, the efficiency of the power transmission is smaller than 100 percent. In order to improve this problem, a power factor correction circuit has to be used, especially, in high power machines. This thesis aims to design a high power DC supply with the PFC operating in continuous current mode. According to the considerations of low cost and low harmonic distortion, the average current mode control is used, In addition, a zero-crossing AC switch using TRIAC is applied to avoid the inrush current. Aver implementation, the measured power efficiency and power factor are respectively greater than 0.95 and 0.90, for the output power among 300W and 1000W.
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Huang, Li-Yu, and 黃立宇. "A Subranging SAR ADC with Hybrid Power Supply System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/e9tdv6.
Full textAbstract:
碩士國立臺灣大學
電子工程學研究所
106
In recent years, with the progress of the process, the low speed problem of subrange successive-approximation register (SAR) ADC has been improved. By virtue of it’s low power consumption characteristics, it has gradually become the mainstream analog-to-digital converter. In low-power SAR ADC design, the quality factor have achieved the femto level. In contrast, the power consumption of power supply circuit had significantly beyond the analog-to-digital converter. In order to ameliorate this problem, this essay propose a hybrid power supply system that is synchronized with the analog-to-digital converter. It can increase the efficiency of the power supply circuit dramatically. This proposed work can achieve the conversion rate of 400KS/s with 200 KHz input frequency. Including dynamic LDO and SAR ADC, The active area is only 0.0098 mm2. Without external-decoupling capacitor, it consumes 0.334nW and FoMW of 1.63fJ/conversion-step. It is suitable for touch with display driver integration (TDDI) module.
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Gao, Yong Qing, and 高永慶. "Cost effective, unlimitedly expandable modular DC power supply system." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/23788280876981746775.
Full text
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Zheng, Ying-Xin, and 鄭盈信. "Design of Aquarium Monitoring System by Wireless Power Supply." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/23fd9c.
Full textAbstract:
碩士國立虎尾科技大學
電機工程系碩士班
105
This thesis develops a monitoring system for aquariums by wireless power supply, and the used in this paper is a home edition aquariums, it’s capacity of about 15 liters. The monitoring system is built by Arduino and App Inventor 2, which uses Bluetooth to connect the cellphone and monitoring system, it can be controlled by cellphone, and it has two operating modes, one is manual mode and the other is automatic mode. When the switch is switched to automatic mode the system will be controlled by the value of sensor, or it can be switched to manual mode, the system will be controlled by user from the cellphone. The power supply of the monitoring system is using wireless power supply module which is using magnetic field coupling resonant to provide 12 voltage to 5 voltage.
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Hong, Wei-En, and 洪偉恩. "Household Disaster Prevention Type Fuel Cell Power Supply System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69849667867655484453.
Full textAbstract:
碩士國立高雄第一科技大學
電子工程研究所
101
This paper presents the design of a family disaster prevention type fuel cell power supply system, this system architecture is to use the fuel cell provides power, high step-up circuit structure utilizes the boost-flyback converter based derived to boost-forward-flyback converter, through the full-bridge converter switching DC to AC used to supply the family. This system with hydrogen as the fuel supply electricity, and the supply of electricity will not cause environmental pollution, it’s very environmentally friendly. When emergency or disasters can provide basic and essential power of the family. Finally, the implementation of the circuit specifications of the input voltage is 80 V , the output voltage of 380 V and a rated power of 1000 W high booster circuit, and digital controller dsPIC30F4011 as the full-bridge converter of the power switch control, final experimental results of the output AC 60Hz , 110V to verify the effectiveness and practicality.
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Chen, Zhi-Wei, and 陳志瑋. "Reliability Driven Power Supply System Design for Signal Integrity." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/70376634448154787519.
Full textAbstract:
碩士中華大學
資訊工程學系(所)
95
In modern VLSI chips, the increase in chip densities yields an increase in the currents drawn from the power network, and the increase in wire resistances makes the current delivery from the power network difficult. Based on the locations of the current requirements in a given floorplan, the floorplan–aware hierarchical power quad-grids(FHPQGs) are used to dynamically construct the topology of power grids to meet the local distribution of high current densities in the floorplan. Based on the geometrical structure in the proposed FHPQGs, an optimal circuit analysis approach is further proposed to accurately find the currents of all the reference branches and the voltages of all the reference nodes in the FHPQGs. Given a floorplan with hierarchical power quad-grids(HPQGs), the IR-drop constraint and the electro-migration constraint, an iterative two-phase approach is proposed to design reliability-driven HPQGs to assign limited power pads and power wires to supply the required current and satisfy the current density constraint for any power branch and the IR-drop constraint for any power node with minimizing total wiring area. The experimental results show that the iterative two-phase approach uses less total wiring area under limited power pads to release all the IR-drop constraints in reasonable CPU time for the tested examples.
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CHIH-CHANG, CHANG, and 張誌彰. "Solar Cell Based Power Supply System For Household Requirment." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/25672155377272565673.
Full textAbstract:
碩士國立臺灣大學
電機工程學研究所
89
The thesis describes the implementation of the solar cell based power supply system for home use. The system contains two kinds of operation modes, independent-supply mode and parallel-to-utility mode. In the parallel- to-utility mode, the solar energy can be converted into AC power and fed into the utility by the inverter stage, also adapts to the characteristics of the solar cells and achieves maximum power point tracking operation. However, for the utility malfunction, system can soon detect automatically and switch to the independent- supply mode operation. In the independent-supply mode, system can supply constant voltage source for the household appliances requirements. The Proposed system controller is implemented by a low-cost micro- processor 80196MC. The hardware is designed for the 4kW application and the household requirements. Due to the fully-digitized control and the power module structure, not only the circuit can be simplified, but also the system reliability can be improved. On the other hand, built-in perfect protection that prevent system from being damaged should the utility malfunction or be over stressed. Finally, experimental results are provited to verify the theoretical discussion and design procedure of this system.
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Sychenko, Viktor, Valeriy Kuznetsov, Yevheniy Kosarev, Petro Beh, Yuriy Sayenko, Bohdan Styslo, Mihail Pavlichenko, Ihor Vasilev, and Mykola Pulin. "The concept of a hybrid traction power supply system." Thesis, 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/47444.
Full textAbstract:
The growing shortage of energy resources to provide heavy traffic and high-speed traffic
necessitates the development of a new power supply scheme for a traction network using sources of
distributed generation of electric energy. Application of asymmetric distributed traction power system
with the use of distributed generation allows to increase electric energy efficiency of the feed system of
rolling stock, reduce its material capacity and increase the reliability of the functioning of the railway
system as a whole. The proposed structure of the hybrid electric traction system involves the creation of a
new paradigm aimed at ensuring high demands on the voltage and specific power in the traction network,
which will allow to improve the quality and safety of the transportation process when increasing the
energy performance indicators. This paradigm will allow to form a new philosophy of building traction
power systems. The key elements of this philosophy are decentralization of generation and consumption of
electric energy, the use of intelligent electric equipment, distributed power supply management in a single
information space of the energy process during transportation. The peculiarity of the proposed work is the
optimal combination of technological processes of transmission, consumption of electric energy and
transportation, taking into account the specific conditions of functioning of the electrified section: points
of connection of power sources and their type, profile of the track, schedule of trains, types of rolling stock
and equipment. Conceptually, the hybrid traction power system is an electric hub, in which the inputs are
generating points, and the output is the power supply system of the rolling stock. The internal structure of
the electric power objects of the hub is determined by the type of transformation and accumulation of
electric energy and ways of managing these objects in real time.