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Salih, Embaiya. "Superconducting magnetic energy storage for power system stability and quality enhancement." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2018. https://ro.ecu.edu.au/theses/2084.
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The stability of power systems has become the most critical issue affecting their quality and performance. Concerns over climate change are now moving the energy sector into a new era of modern power grids. To sustain the reliable operation of power systems and improve the quality of power generation, several instability issues that affect the quality of the operation of power systems are addressed in this thesis. The first is the fluctuations in generated power due to variations in wind velocity in wind power systems. The fluctuation in the wind, which is the main energy source in a wind power system, leads directly to voltage and frequency fluctuations in both generation and load and affects the stability of power systems. In microgrids, a long period of transient, which occurs after the switching operation of microgrid (MG) and load demand changes, is the second issue addressed. The third instability issue is the impact of instability on the power load because of voltage and frequency variations.
Therefore, as a contribution to overcoming the impacts of these instability issues on power systems, this thesis proposes to apply a superconducting magnetic energy storage (SMES)-based neural network (NN) control strategy to enhance the quality of the wind power supply, increase the stability of the MG, and protect critical power loads. In this research, as a method, NNs and the adaptive control method are proposed and applied to control the power flow via its power conversion system. NNs are applied to forecast renewable energy as a short-term prediction of wind power fluctuations. The backpropagation function is used for training the NNs on wind speed variations and then NN is used as a predictive controller. To increase the stability of wind power systems, the proposed SMES-based NN is connected to a wind power system for stabilising wind power fluctuations. SMES-based NN is also applied to an MG to reduce the transient period that occurs after switching of the MG and because of the load demand changes. Furthermore, SMES is operated as an uninterruptible power supply (UPS) to reduce the fluctuations in generated power to protect the critical loads.
In this research, an NN controller is built and trained to predict and track the fluctuations of wind power. This NN controller as a reference model, along with the adaptive control strategy, is implemented and applied as a control system for SMES. The behaviour of the proposed system is verified to decrease the voltage and frequency fluctuations in wind power supply with variations of wind speed. The results show that with a high dynamic response, the proposed NN controller based SMES maintains the voltage and frequency within acceptable limits and stabilises its generating power significantly. Also, the reliability of the SMES-NN for stabilising an MG is investigated. The results verify that the MG was stabilised under the proposed power controller. Moreover, the system’s ability to protect and support the loads during power interruptions and instability events affecting the quality of the supply is tested. The results show that as a short-term storage system, the UPS-SMES efficiently protects the loads by injecting power into the system when it is needed.
Consequently, this research with the developed techniques of reducing instability impacts on power systems could underpin the reliability of renewable power sources as well as supporting and protecting equipment and power loads from such critical issues.
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Ciceron, Jérémie. "Superconducting magnetic energy storage with second-generation high temperature superconductors." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT012/document.
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En chargeant en courant une inductance supraconductrice, on stock de l’énergie magnétique. Ce principe est appelé SMES pour Superconducting Magnetic Energy Storage. Ce type de dispositifs a une densité d’énergie relativement faible mais peut avoir une densité de puissance élevée. Cette thèse s’inscrit dans le cadre du projet BOSSE, qui vise à mettre au point un démonstrateur de SMES dans la gamme du MJ. Ce SMES sera à la fois plus compacte que ses prédécesseurs et battra le record actuel d’énergie spécifique d’un bobinage supraconducteur en atteignant 20 kJ/kg. Cet objectif sera atteint grâce à l’utilisation de supraconducteurs haute température critique de seconde génération, dits conducteurs « REBCO ».Cette thèse aborde de manière générale la problématique du design de SMES et propose des éléments de réflexion et des solutions pour un pré-design rapide du bobinage d’un SMES. Le design du SMES à haute densité d’énergie du projet BOSSE est détaillé.Des éléments modulaires (galettes de ruban REBCO) du SMES ont été fabriqués et testés en champ propre et sous champ magnétique externe. Les méthodes et les résultats de détection de transition des galettes de l’état supraconducteur vers l’état normal sont présentés. Ces détections ont permis de garantir l’intégrité des galettes REBCO lors de transitions, même à très forte densité de courant (980 A/mm2 dans le conducteur nu).Ce travail est soutenu par la DGA (Direction Générale de l’Armement)Magnetic energy is stored when a superconducting inductance is fed with current. This principle is called SMES (Superconducting Magnetic Energy Storage). This kind of device has a relatively low energy density but can have a high power density. This PhD work has been conducted in the frame of the BOSSE project with the objective to develop a SMES demonstrator in the MJ range. This SMES will be especially compact and will reach a specific energy of 20 kJ/kg of winding, which is 50 % over the current world record for a superconducting coil. This performance is made possible by the use of 2nd generation high critical temperature superconductors, so-called “REBCO” conductors.This work tackles the general problematic of SMES design and proposes elements of reflection and solutions for fast pre-design of a SMES winding. The design of the high specific energy SMES of the BOSSE project is presented in detail.Modular elements (pancakes of REBCO tapes) of the SMES have been manufactured and tested in self-field and under background magnetic field. During these tests, transitions from superconducting state to normal state have been detected. These early detections have prevented the pancakes to be damaged when transitions occurred, even at very high current density (980 A/mm2 in the bare conductor). The measurement method is presented, as well as the results of the tests.The BOSSE project has been funded by the DGA (French Defence Procurement Agency)
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Superczynski, Matthew J. "Analysis of the Power Conditioning System for a Superconducting Magnetic Energy Storage Unit." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34860.
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Superconducting Magnetic Energy Storage (SMES) has branched out from its application origins of load leveling, in the early 1970s, to include power quality for utility, industrial, commercial and military applications. It has also shown promise as a power supply for pulsed loads such as electric guns and electromagnetic aircraft launchers (EMAL) as well as for vital loads when power distribution systems are temporarily down. These new applications demand more efficient and compact high performance power electronics.
A 250 kW Power Conditioning System (PCS), consisting of a voltage source converter (VSC) and bi-directional two-quadrant DC/DC converter (chopper), was developed at the Center for Power Electronics Systems (CPES) under an ONR funded program. The project was to develop advanced power electronic techniques for SMES Naval applications. This thesis focuses on system analysis and development of a demonstration test plan to illustrate the SMES systems' ability to be multitasked for implementation on naval ships. The demonstration focuses on three applications; power quality, pulsed power and vital loads.
An integrated system controller, based on an Altera programmable logic device, was developed to coordinate charge/discharge transitions. The system controller integrated the chopper and VSC controller, configured applicable loads, and dictated sequencing of events during mode transitions.
Initial tests with a SMES coil resulted in problems during mode transitions. These problems caused uncontrollable transients and caused protection to trigger and processors to shut down. Accurate models of both the Chopper and VSC were developed and an analysis of these mode transition transients was conducted. Solutions were proposed, simulated and implemented in hardware. Successful operation of the system was achieved and verified with both a low temperature superconductor here at CPES and a high temperature superconductor at The Naval Research Lab.Master of Science
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Kvarnström, Joakim. "Increasing the efficiency of the CERN accelerators by use of Superconducting Magnetic Energy Storage (SMES)." Thesis, Uppsala universitet, FREIA, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-450949.
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This report explains how an SMES is operated and how SMES systems could be used to increase the efficiency of the CERN Large Hadron Collider (LHC) and the Future Circular Collider (FCC) as well as to reduce the very high power needs of a future Muon Collider (MC). The performance of SMES for other applications and late developments of the technique will also be described.
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Yunus, A. M. Shiddiq. "Application of SMES Unit to improve the performance of doubly fed induction generator based WECS." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/1450.
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Due to the rising demand of energy over several decades, conventional energy resources have been continuously and drastically explored all around the world. As a result, global warming is inevitable due to the massive exhaust of CO2 into the atmosphere from the conventional energy sources. This global issue has become a high concern of industrial countries who are trying to reduce their emission production by increasing the utilization of renewable energies such as wind energy. Wind energy has become very attractive since the revolution of power electronics technology, which can be equipped with wind turbines. Wind energy can be optimally captured with wind turbine converters. However, these converters are very sensitive if connected with the grid as grid disturbances may have a catastrophic impact on the overall performance of the wind turbines.In this thesis, superconducting magnetic energy storage (SMES) is applied on wind energy conversion systems (WECSs) that are equipped with doubly fed induction generators (DFIGs) during the presence of voltage sags and swells in the grid side. Without SMES, certain levels of voltage sags and swells in the grid side may cause a critical operating condition that may require disconnection of WECS to the grid. This condition is mainly determined by the voltage profile at the point of common coupling (PCC), which is set up differently by concerned countries all over the world. This requirement is determined by the transmission system operator (TSO) in conjunction with the concerned government. The determined requirement is known as grid codes or fault ride through (FRT) capability.The selection of a SMES unit in this thesis is based on its advantages over other energy storage technologies. Compared to other energy storage options, the SMES unit is ranked first in terms of highest efficiency, which is 90-99%. The high efficiency of the SMES unit is achieved by its low power loss because electric currents in the coil encounter almost no resistance and there are no moving parts, which means no friction losses. Meanwhile, DFIG is selected because it is the most popular installed WECS over the world. In 2004 about 55% of the total installed WECS worldwide were equipped with DFIG. There are two main strategies that can be applied to meet the grid requirements of a particular TSO. The first strategy is development of new control techniques to fulfil the criterion of the TSOs. This strategy, however, is applicable only to the new WECS that have not been connected to the power grid. If new control techniques are applied to the existing gridconnected WECSs, they will not be cost effective because the obsolete design must be dismantled and re-installed to comply with current grid code requirements. The second strategy is the utilization of flexible AC transmission system (FACTS) devices or storage energy devices to meet the grid code requirements. This strategy seems more appropriate for implementation in the existing WECS-grid connection in order to comply with the current grid code requirements. By appropriate design, the devices might be more cost effective compared to the first strategy, particularly for the large wind farms that are already connected to the grid.A new control algorithm of a SMES unit, which is simple but still involves all the important parameters, is employed in this study. Using the hysteresis current control approach in conjunction with a fuzzy logic controller, the SMES unit successfully and effectively improves the performance of the DFIG during voltage sag and swell events in the grid side; thus, this will prevent the WECS equipped with DFIG from being disconnected from the grid according to the selected fault ride through used in this study. The dynamic study of DFIG with SMES during short load variation is carried out as an additional advantage of SMES application on a DFIG system. In this study, the proposed SMES unit is controlled to compensate the reduced transfer power of DFIG during the short load variation event. Moreover, the SMES unit is also engaged in absorbing/storing some amount of excessive power that might be transferred to the grid when the local loads are suddenly decreased. Finally, the studies of intermittent misfires and fire-through that take place within the converters of DFIG are carried out in order to investigate the impact of these converter faults on the performance of DFIG. In this part, the proposed SMES unit is controlled to effectively improve the DFIG’s performance in order to prevent it from being disconnected or shut down from the power grid during the occurrence of these intermittent switching faults.
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Lee, Dong-Ho. "A Power Conditioning System for Superconductive Magnetic Energy Storage based on Multi-Level Voltage Source Converter." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/11042.
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A new power conditioning system (PCS) for superconductive magnetic energy storage (SMES) is developed and its prototype test system is built and tested. The PCS uses IGBTs for high-speed PWM operation and has a multi-level chopper-VSC structure. The prototype test system has three-level that can handle up to 250-kVA with a 1800-V DC link, a 200-A maximum load current , and a switching frequency reaching 20-kHz with the help of zero-current-transition (ZCT) soft-switching. This PCS has a great number of advantages over conventional ones in terms of size, speed, and cost.
Conventional PCSs use thyristors, due to the power capacity of the SMES system. The speed limit of the thyristor uses a six-pulse operation that generates a high harmonic. To reduce the harmonic, multiple PCSs are connected together with phase-matching transformers that need to be precise to be effective in reducing the harmonics. So, the system becomes large and expensive. In addition, the dynamic range of the PCSs are also limited by the six-pulse operation, because it limits the useful area of the PCS applications.
By employing a high-speed PWM, the new PCS can reduce the harmonics without using the transformers reducing size and cost, and has wide dynamic range. However, the speed of a switching device is generally inversely proportional to its power handling capacity. Therefore, employing a multi-level structure is one method of extending the power-handling capability of the high-speed device. Switching loss is another factor that limits the speed of the switch, but it can be reduced by soft-switching techniques. The 20-kHz switching frequency can be obtained with the help of the ZCT soft-switching technique, which can reduce about 90% of switching losses from the IGBT during both turn-on and turn-off transients. There are two different topologies of the PCS; the current source converter (CSC) type and the chopper and voltage source converter (VSC) type. In terms of the SMES system efficiency, the chopper-VSC type shows a less volt-ampere requirement of the power device. Therefore, the new PCS system has a chopper-VSC structure.
Since the chopper-VSC structure consists of multiple legs that can be modularized, a power electronics building block (PEBB) leg is a good choice; all of the system problems caused by the high frequency can be solved within the PEBB leg. The VSC is built with three of the PEBB legs. Three-phase AC is implemented with a three-level space vector modulation (SVM) that can reduce the number of switching and harmonic contents from the output current. A closed-loop control system is also implemented for the VSC, and shows 600-Hz control bandwidth.
The multi-level structure used requires too many high-speed switches. However, not all of them are used at the same time during normal multi-level operation. A new multi-level topology is suggested that requires only two high-speed switches, regardless of the number of levels. Other switches can be replaced with slow-speed switches that can allow additional cost savings.Ph. D.
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Arsoy, Aysen. "Electromagnetic Transient and Dynamic Modeling and Simulation of a StatCom-SMES Compensator in Power Systems." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27225.
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Electromagnetic transient and dynamic modeling and simulation studies are presented for a StatCom-SMES compensator in power systems. The transient study aims to better understand the transient process and interaction between a high power/high voltage SMES coil and its power electronics interface, dc-dc chopper. The chopper is used to attach the SMES coil to a StatCom. Following the transient study, the integration of a StatCom with SMES was explored to demonstrate the effectiveness of the combined compensator in damping power oscillations. The transient simulation package PSCAD/EMTDC has been used to perform the integrated modeling and simulation studies.
A state of the art review of SMES technology was conducted. Its applications in power systems were discussed chronologically. The cost effective and feasible applications of this technology were identified. Incorporation of a SMES coil into an existing StatCom controller is one of the feasible applications, which can provide improved StatCom operation, and therefore much more flexible and controllable power system operation.
The SMES coil with the following unique design characteristics of 50MW (96 MW peak), 100 MJ, 24 kV interface has been used in this study. As a consequence of the high power/ high voltage interface, special care needs to be taken with overvoltages that can stress the insulation of the coil. This requires an investigation of transient overvoltages through a detailed modeling of SMES and its power electronics interface. The electrical model for the SMES coil was developed based on geometrical dimensions of the coil. The interaction between the SMES coil and its power electronics interface (dc-dc chopper for the integration to StatCom) was modeled and simulated to identify transient overvoltages. Transient suppression schemes were developed to reduce these overvoltages. Among these are MOV implementation, surge capacitors, different configurations of the dc-dc chopper.
The integration of the SMES coil to a StatCom controller was developed, and its dynamic behavior in damping oscillations following a three-phase fault was investigated through a number of simulation case studies. The results showed that the addition of energy storage to a StatCom controller can improve the StatCom-alone operation and can possibly reduce the MVA rating requirement for the StatCom operating alone. The effective location selection of a StatCom-SMES controller in a generic power system is also discussed.Ph. D.
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Nielsen, Knut Erik. "Superconducting magnetic energy storage in power systems with renewable energy sources." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10817.
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The increasing focus on large scale integration of new renewable energy sources like wind power and wave power introduces the need for energy storage. Superconducting Magnetic Energy Storage (SMES) is a promising alternative for active power compensation. Having high efficiency, very fast response time and high power capability it is ideal for levelling fast fluctuations. This thesis investigates the feasibility of a current source converter as a power conditioning system for SMES applications. The current source converter is compared with the voltage source converter solution from the project thesis. A control system is developed for the converter. The modulation technique is also investigated. The SMES is connected in shunt with an induction generator, and is facing a stiff network. The objective of the SMES is to compensate for power fluctuations from the induction generator due to variations in wind speed. The converter is controlled by a PI-regulator and a current compensation technique deduced from abc-theory. Simulations on the system are carried out using the software PSIM. The simulations have proved that the SMES works as both an active and reactive power compensator and smoothes power delivery to the grid. The converter does however not seem like an optimum solution at the moment. High harmonic distortion of the output currents is the main reason for this. However this system might be interesting for low power applications like wave power. I
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Varghese, Philip. "Magnet design considerations for superconductive magnetic energy storage." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-02052007-081238/.
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Kumar, Prem. "Applications of superconducting magnetic energy storage systems in power systems." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44118.
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A Superconducting Magnetic Energy Storage (SMES) system is a very efficient storage device capable of storing large amounts of energy. The primary applications it has been considered till now are load-leveling and system stabilization.This thesis explores new applications/benefits of SMES in power systems. Three areas have been identified.
â ¢ Using SMES in conjunction with PV systems.SMES because of their excellent dynamic response and PV being an intermittent source complement one another.A scheme for this hybrid system is developed and simulation done accordingly.
Using SMES in an Asynchronous link between Power Systems. SMES when used in a series configuration between two or more systems combines the benefits of asynchronous connection, interconnection and energy storage. A model of such a scheme has been developed and the control of such a scheme is demonstrated using the EMTP. The economic benefits of this scheme over pure power interchange, SMES operation alone and a battery/dc link is shown.
Improvement of transmission through the use of SMES. SMES when used for diurnal load leveling provides additional benefits like reduced transmission losses, reduced peak loading and more effective utilization of transmission facility, the impact of size and location on these benefits were studied, and if used as an asynchronous link provides power flow control.Master of Science
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Shirai, Yasuyuki. "STUDIES ON POWER SYSTEM CHARACTERISTICS OF SUPERCONDUCTING MAGNETIC ENERGY STORAGE." Kyoto University, 1988. http://hdl.handle.net/2433/74715.
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Li, Jianwei. "Design and assessment of the superconducting magnetic energy storage and the battery hybrid energy storage system." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760945.
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Bowers, Brian J. (Brian Jeffrey). "Integrated cryogenic refrigeration system design for superconducting magnetic energy storage systems." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42681.
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Zheng, David Z. "Impacts of superconducting magnetic energy storage unit on power system stability." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07112009-040323/.
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Hawley, Christopher John. "Design and manufacture of a high temperature superconducting magnetic energy storage device." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060508.143200/index.html.
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Pal, Bikash Chandra. "Robust damping control of inter-area oscillations in power systems with superconducting magnetic energy storage devices." Thesis, Imperial College London, 1999. http://hdl.handle.net/10044/1/7179.
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Pombeiro, João Pedro Aurélio. "Contributos para o projeto de sistemas SMES (Superconducting Magnetic Energy Storage) para melhoria na qualidade da energia." Master's thesis, 2018. http://hdl.handle.net/10362/59919.
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Existem vários sistemas de armazenamento de energia elétrica, esta dissertação irá incidir essencialmente nos sistemas Superconducting Magnetic Energy Storage (SMES).
Inicialmente, para um melhor entendimento destes sistemas é necessário estudar concei-tos como a supercondutividade e materiais supercondutores, particularmente os superconduto-res de alta temperatura (HTS).
Nesta dissertação irão ser abordadas diversas aplicações destes sistemas. Serão desta-cados os sistemas SMES com tecnologia HTS, pois são os que vão ao encontro dos temas abordados ao longo do presente trabalho. Sendo realizada uma breve análise de como estes sistemas podem melhorar a qualidade da energia elétrica (QEE).
O principal contributo que esta dissertação pretende dar é a construção de um algoritmo (desenvolvido em software MATLAB) capaz de obter as especificações para o dimensionamento de uma bobina supercondutora para um sistema SMES. Os dados necessários por parte do utilizador são as especificações da fita supercondutora, a energia que o utilizador pretende ar-mazenar, o número de bobinas que pretende utilizar e a distância entre bobinas.
Os resultados obtidos a partir do algoritmo são posteriormente simulados através de um software de elementos finitos (COMSOL Multiphysics) de forma a demonstrar que os mesmos são válidos.
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Ham, Wan Kyun. "Active and reactive power control model of superconducting magnetic energy storage (SMES) for the improvement of power system stability." Thesis, 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3120301.
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Liu, Sheng-ying, and 劉昇穎. "Dynamic Simulations of Superconducting Magnetic Energy Storage System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/93590078231643505840.
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碩士義守大學
電子工程學系碩士班
93
A superconducting magnetic energy storage (SMES) system can achieve high-speed, high-rating power exchange, including both active and reactive power. This thesis presents the dynamic simulations of a SMES system by means of the MATLAB/SIMULINK toolbox, power system blockset (PSB). However, with the modern powerful personal computer technology, the time consumed is nevertheless lengthy. In order to save the simulation time required, this thesis develops a simplified model of the SMES. The simplified model simulations can be completed in couple of seconds, and the final results agree with the one used by the PSB.
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Lee, Shin-Muh, and 李新木. "Damping subsynchronous resonance using superconducting magnetic energy storage unit." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/33158179835374966921.
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碩士國立成功大學
電機工程研究所
81
This thesis investigates a damping scheme using superconducting ing magnetic energy storage (SMES) unit to damp subsynchronous resonance (SSR) of the IEEE Second Benchmark Model, system-1 which is a widely employed standard model for computer simulation of SSR. In order to stabilize all SSR modes, simultaneous active and reactive power modulation and a proportional-integral-derivative (PID) damping controller designed by modal control theory are proposed for the SMES unit. Frequency-domain approach based on eigenvalue analysis and time-domain approach based on nonlinear model simulations are performed to validate the effectiveness of the proposed damping method.It can be concluded from the simulation results that the proposed damping scheme can effectively suppress SSR of the studied system.
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Lee, Ying-Te, and 李盈德. "Electrical Power Interchanges using Superconducting Magnetic Energy Storage Systems." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/76514995075525370908.
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碩士義守大學
電機工程學系碩士班
94
This objective of this thesis is to investigate the operation of the superconducting magnetic energy storage (SMES) system. A SMES system can absorb and supply electric power instantly. It comprises a superconducting coil (SC) and a converter. The SC is for energy storage. Electric energy stored in a SC is in the form of dc current. Therefore, an interface that can exchange the stored energy in an SC is required. In this thesis, the converter can employ either a rectifier or a chopper. Several computer simulations demonstrate the dynamics of an SMES system.
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Badel, Arnaud. "Superconducting Magnetic Energy Storage Haute Température Critique comme Source Impulsionnelle." Phd thesis, 2010. http://tel.archives-ouvertes.fr/tel-00654844.
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Le principe d'un SMES (Superconducting Magnetic Energy Storage) est le stockage d'énergie dans l'induction magnétique créé par une bobine court-circuitée. Dans ce travail, les possibilités offertes par les SMES en matériau supraconducteur haute température critique sont étudiées pour l'application source impulsionnelle. L'étude est plus particulièrement orientée vers l'alimentation de lanceurs électromagnétiques, pour laquelle l'utilisation de SMES est comparée à l'alimentation conventionnelle par banc de condensateurs. Dans ce cadre, de nouveaux concepts de SMES adaptés à la charge sont proposés, permettant des gains conséquents en terme de rendement énergétique global. En parallèle, la faisabilité pratique d'une alimentation de lanceur par SMES est envisagée par la réalisation d'un démonstrateur. Celui-ci est une évolution d'un dispositif existant testé avec succès en 2007. La réalisation de ce démonstrateur a permis de valider des solutions technologiques concernant notamment le refroidissement et la tenue diélectrique d'un SMES hTc de forte puissance. Ce travail est soutenu par la DGA (Délégation Générale pour l'Armement).
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Simões, Francisco Luís Gonçalves. "Assessment of Using Superconducting Magnetic Energy Storage for Current Harmonic Compensation." Master's thesis, 2021. http://hdl.handle.net/10362/133296.
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This thesis was developed in the frame of the increasing need for power quality control due
to the presence of non-linear loads connected to the grid that inject undesired harmonics.
The absence of research regarding the simulation of Superconducting Magnetic Energy
Storage technology in this type of application made it an interesting approach to study and
develop, with the additional benefit of creating an open-source project to catalyze further
research. This harmonic correction was achieved by using an active filter composed of a
voltage source converter, a capacitor, and a Superconducting Magnetic Energy Storage
unit. Using Superconducting Magnetic Energy Storage technology allows the use of this
type of system in renewable generation, more specifically wind farms, reducing production
variation and ensuring an increased power quality of the electrical grid. This work exhibits a
positive result of using Superconducting Magnetic Energy Storage technology on harmonic
correction and catalyzes further simulation research and possibly a practical application
derived from this work’s developments and provided tools.Esta tese foi desenvolvida no contexto do aumento de cargas não lineares conectadas à rede que injetam harmónicas indesejadas e a consequente necessidade de controlo de qualidade da energia fornecida. A ausência de material de estudo relativo à simulação da tecnologia de armazenamento de energia em bobinas supercondutoras neste tipo de aplicação foi interessante para o estudo e desenvolvimento, com o benefício adicional de criar um projeto para catalisar novos desenvolvimentos. Esta correção de harmónicas foi obtida por meio de um filtro ativo composto por um conversor baseado numa fonte de tensão, um condensador e uma unidade de bobinas supercondutoras. O uso de tecnologia de armazenamento de energia em bobinas supercondutoras permite a utilização deste tipo de sistemas em fontes de energia renovável, mais especificamente em parques eólicos, atenuando as variações na produção e garantindo a qualidade de energia da rede elétrica. Deste trabalho resulta um resultado positivo do uso da tecnologia de armazenamento de energia em bobinas supercondutoras na correção de harmónicas e catalisa novas pesquisas de simulação e, possivelmente, uma aplicação prática que tenha como base os desenvolvimentos deste trabalho e das ferramentas fornecidas.
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LI, YONG-XUN, and 李永勳. "Small signal stability analysis of power systems with superconducting magnetic energy storage units." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/87447438940034895600.
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Tseng, H. Y., and 曾宏毅. "Damping of SSR in A Nonidentical Twoo-Machine System Using Superconducting Magnetic Energy Storage Units." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/88268675344517078089.
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碩士國立成功大學
電機工程學系
85
This thesis investigates the application of superconducting magnetic energy storage (SMES) units to damp subsynchronous resonance (SSR) occurred in a nonidentical two-machine system. The IEEE Second Benchmark Model, system-2 is employed to analyze the effectiveness of the proposed SMES unit with simultaneous active and reactive power modulation. A proportional-integral-derivative (PID) controller using speed deviations of the studied generators as feedback signals is designed by modal control theory to modulate the firing angle of the SMES unit. In order to have a complete and detailed research, a frequency-domain approach based on eigenvalue analysis and a time-domain approach based on nonlinear model simulation are both performed to validate the effectiveness of the proposed damping method. It can be concluded from the simulation results that the proposed damping scheme can effectively suppress subsynchronous torsional interactions of the studied system.
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Chen, Shiang-Shong, and 陳翔雄. "Dynamic-Stability Improvement of a Large-Scale Offshore Wind Farm Using a Superconducting Magnetic Energy Storage Unit." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08442058689812900233.
Full textAbstract:
博士國立成功大學
電機工程學系碩博士班
97
This dissertation presents a control scheme based on a superconducting magnetic energy storage (SMES) unit to achieve both power flow control and damping improvement of a large-scale offshore wind farm connected to a large power grid. The performance of the studied wind farm (WF) is simulated by an equivalent 80-MW induction generator (IG) consisting of forty 2-MW IGs while an equivalent 60-MW IG consisting of thirty 2-MW IGs is employed to study the characteristics of the marine-current farm (MCF). A damping controller for the SMES unit is designed by using modal control theory to contribute effective damping characteristics to the studied WF and the combined WF and MCF under different operating conditions. A frequency-domain approach based on a linearized system model using eigenvalue techniques to designed a damping controller. A time-domain scheme based on a nonlinear system model subject to disturbance conditions are both employed to validate the effectiveness of the proposed control scheme. It can be concluded from the simulated results that the proposed SMES unit combined with the designed damping controller is very effective to stabilize the studied WF and the combined WF and MCF under various operating conditions. The inherent fluctuations of the injected active power and reactive power of the WF and the combined WF and MCF to the power grid can also be effectively controlled by the proposed control scheme.