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Neupane, Nirdesh. "Comparison of Switched Reluctance Motor and Double Stator Switched Reluctance Motor". ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2564.
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This thesis is concerned with the design and analysis of Switched Reluctance Motor (SRM) and its improved structure Double Stator Switched Reluctance Motor (DSSRM). Three configurations of SRM viz. Inner Stator, Outer stator and Double Stator are designed and simulated in ANSYS Maxwell Suite. Design parameters are chosen by aiming optimum performance of motor after literature review and analytical study of the motor. SRM is not a line start machine, so power converter circuit is required to excite the motor. Without proper switching of current, desired torque is not obtained in SRM. The converter circuit and switching unit is built in Maxwell Circuit Editor Tools. Both magnetostatics and transient analysis is performed to investigate motion torque, torque ripple, normal force and radial force. A good comprehensive comparison of three different types of SRMs based on their torque profile and force densities is presented. Simulation performed verified better performance of DSSRM.
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Kumar, Nachegari Kishore, i Eadi Suresh Babu. "Simulation of Switched Ethernet". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-231.
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Switched Ethernet is an Ethernet LAN that uses switches to connect individual nodes.
This is popular because of its effective and convenient way of extending the bandwidth of
existing Ethernets. Switched Ethernet is being considered by the industry community because
of its open standardization, cost effectiveness, and the support for higher data rates up to
10Gbps. Even though many special-purposed solutions were proposed to support time
constrained communication over Switched Ethernet, still there were some doubts about the
real time handling capability of Switched Ethernet. To achieve reliable transmission
guarantees for real time traffic over Switched Ethernet, it is important to measure the
performance of Switched Ethernet networks for real time communication. In this thesis work
we have observed the average end-to-end packet delay for real time traffic over a Switched
Ethernet by simulation, which is very much essential for real time communication in
industrial applications, where the communication is time-deterministic. In our thesis we used
FCFS priority queuing in both the source nodes and switch. In this thesis we also discussed
about the feasibility analysis for fixed sized frames and some traffic handling methods. We
used 100mbp/s single full duplex Ethernet switch for our simulation. Finally simulation
analysis and simulation results are discussed. Our purpose of simulation of Switched Ethernet
networks is of good importance for the real time industrial applications.
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Forsyth, A. J. "Switched-mode power conversion". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233948.
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The thesis begins with a general introduction to switched-mode power conversion. The main application areas of the technique are outlined and a summary is presented of current research work. The following chapters then focus on one recent development in the field, the Cuk converter and integrated magnetics. First, the steady-state performance limitations of the Cuk converter are explored through a comparison with the basic switched-mode converter topologies. The circuit is seen to possess several attractive properties including input and output current waveforms which are continuous rather than pulsating. However, the switching losses are shown to be high. A regenerative snubber is presented which reduces the transistor turn-off loss whilst preserving the high-quality input and output current waveforms of the converter. The integrated magnetics technique is discussed in the following chapter. This is the technique whereby converter magnetic components are coupled to eliminate input and output ripple currents and therefore improve steady-state performance. The possible problems are highlighted of attempting to couple transformers and inductors on a single core and an alternative coupling technique is outlined which uses an auxiliary electric circuit. The introduction of magnetic coupling in the Cuk converter to eliminate input and output ripple currents and improve steady-state performance results in more complicated dynamic characteristics and a more complex control problem. The state-space averaging technique is used in chapter 4 with the aid of a control engineering design package, CLADP, to analyse the problem. The impact of component coupling on the converter dynamic characteristics is explained and possible control strategies are suggested and verified. Finally, the Cuk converter with component coupling is assessed as a large-signal waveshaper. Several inverter configurations are examined in which a switched-mode converter operating under closed-loop control is used as a waveshaper to synthesise high-quality sinusoidal output currents. The implementation of the schemes using a Cuk converter with component coupling is described.
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Cranley, Nikki. "Switched for Networked FTI". International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/605931.
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ITC/USA 2010 Conference Proceedings / The Forty-Sixth Annual International Telemetering Conference and Technical Exhibition / October 25-28, 2010 / Town and Country Resort & Convention Center, San Diego, CaliforniaEthernet technology offers numerous benefits for networked Flight Test Instrumentation (FTI) systems such as increased data rates, flexibility, scalability and most importantly interoperability owing to the inherent interface, protocol and technological standardization. In a networked FTI system, the switch is a key component that allows data to be routed between Data Acquisition Units (DAU's), networked recorders, data processing and analysis stations. This paper provides an introduction to network switching concepts with a focus on its operation in a networked FTI system. The features of Commercial Off-The-Shelf (COTS) and FTI switches are compared demonstrating the benefits of FTI switches in terms of reliability, routing, throughput, latency, and start-up delays.
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Cardinal, Robert. "TELEMETRY ENTERPRISE SWITCHED NETWORKING". International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/608568.
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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, CaliforniaThe success of the client/server paradigm for modern networked telemetry systems continues to stress the LAN that carries data generated from the acquisition front ends to the display workstations and the file servers on the LAN. As the number of LAN-attached devices such as Loral's System 500 Model 550 (Loral 550) telemetry front end, workstations, and file servers grows beyond two, the Ethernet LAN collision rates increase and the throughput slows down. At what point the network performance declines is a function of the specific application bandwidth demands required. This paper describes a new method for boosting LAN performance by providing Ethernet switching and protocol filtering. The performance of the LAN is critical to the performance of the complete telemetry enterprise architecture.
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Mayo, Maldonado Jonathan. "Switched linear differential systems". Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/383678/.
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In this thesis we study systems with switching dynamics and we propose new mathematical tools to analyse them. We show that the postulation of a global state space structure in current frameworks is restrictive and lead to potential difficulties that limit its use for the analysis of new emerging applications. In order to overcome such shortcomings, we reformulate the foundations in the study of switched systems by developing a trajectory-based approach, where we allow the use of models that are most suitable for the analysis of a each system. These models can involve sets of higher-order differential equations whose state space does not necessarily coincide. Based on this new approach, we first study closed switched systems, and we provide sufficient conditions for stability based on LMIs using the concept of multiple higher order Lyapunov function. We also study the role of positive-realness in stability of bimodal systems and we introduce the concept of positive-real completion. Furthermore, we study open switched systems by developing a dissipativity theory. We give necessary and sufficient conditions for dissipativity in terms of LMIs constructed from the coefficient matrices of the differential equations describing the modes. The relationship between dissipativity and stability is also discussed. Finally, we study the dynamics of energy distribution networks. We develop parsimonious models that deal effectively with the variant complexity of the network and the inherent switching phenomena induced by power converters. We also present the solution to instability problems caused by devices with negative impedance characteristics such as constant power loads, using tools developed in our framework.
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Williams, Kevin. "Q-switched diode lasers". Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296333.
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Muhyaldin, Siham. "Investigation of EDFA power transients in circuit-switched and packet-switched optical networks". Thesis, Aston University, 2009. http://publications.aston.ac.uk/18275/.
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Erbium-doped fibre amplifiers (EDFA’s) are a key technology for the design of all optical communication systems and networks. The superiority of EDFAs lies in their negligible intermodulation distortion across high speed multichannel signals, low intrinsic losses, slow gain dynamics, and gain in a wide range of optical wavelengths. Due to long lifetime in excited states, EDFAs do not oppose the effect of cross-gain saturation. The time characteristics of the gain saturation and recovery effects are between a few hundred microseconds and 10 milliseconds. However, in wavelength division multiplexed (WDM) optical networks with EDFAs, the number of channels traversing an EDFA can change due to the faulty link of the network or the system reconfiguration. It has been found that, due to the variation in channel number in the EDFAs chain, the output system powers of surviving channels can change in a very short time. Thus, the power transient is one of the problems deteriorating system performance. In this thesis, the transient phenomenon in wavelength routed WDM optical networks with EDFA chains was investigated. The task was performed using different input signal powers for circuit switched networks. A simulator for the EDFA gain dynamicmodel was developed to compute the magnitude and speed of the power transients in the non-self-saturated EDFA both single and chained. The dynamic model of the self-saturated EDFAs chain and its simulator were also developed to compute the magnitude and speed of the power transients and the Optical signal-to-noise ratio (OSNR). We found that the OSNR transient magnitude and speed are a function of both the output power transient and the number of EDFAs in the chain. The OSNR value predicts the level of the quality of service in the related network. It was found that the power transients for both self-saturated and non-self-saturated EDFAs are close in magnitude in the case of gain saturated EDFAs networks. Moreover, the cross-gain saturation also degrades the performance of the packet switching networks due to varying traffic characteristics. The magnitude and the speed of output power transients increase along the EDFAs chain. An investigation was done on the asynchronous transfer mode (ATM) or the WDM Internet protocol (WDM-IP) traffic networks using different traffic patterns based on the Pareto and Poisson distribution. The simulator is used to examine the amount and speed of the power transients in Pareto and Poisson distributed traffic at different bit rates, with specific focus on 2.5 Gb/s. It was found from numerical and statistical analysis that the power swing increases if the time interval of theburst-ON/burst-OFF is long in the packet bursts. This is because the gain dynamics is fast during strong signal pulse or with long duration pulses, which is due to the stimulatedemission avalanche depletion of the excited ions. Thus, an increase in output power levelcould lead to error burst which affects the system performance.
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Jasem, Rabah Abduljabbar. "High Resolution Direction of Arrival Estimation with Switched Active Switched Parasitic Antenna Arrays". Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/82087.
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This thesis investigates the ability of Switched Active Switched Parasitic antenna (SASPA) as direction finding arrays. SASPA array consists of N identical antennas in which one element is in active state while the others are parasites during one point of measurement time. The improvements in direction of arrival estimation achieved by using SASPA arrays were examined under different scenarios of the data model. Several estimations were conducted to depict the outperformance of SASPA arrays over all-active antenna arrays.
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Shyirambere, Aimee S. "A Reliability and Survivability Analysis of US Local Telecommunication Switches that Experience Frequent Outages". Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1365724373.
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Kummara, Venkata Guru Raghavendra. "Simulation of Switched Reluctance Motors". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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This project includes the basic principle of the switched reluctance motors, motor topologies, mathematical approach, torque production, electromagnetics, drives, converters and their applications. This part means to help to understand the working principle and properties of SRM,(Switched Reluctance Motors). Some controlling actions of the SRM, such as Current Control and Speed Control, are employed. Simulation results will be discussed at the end and compared with the predefined Simulink Model of the Switched Reluctance Motors.
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Celik, Tuncay. "Segmental rotor switched reluctance drives". Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1286.
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One of the well-known drawbacks of switched reluctance machines is the relatively high output torque ripple. Techniques aiming to reduce machine torque ripple either compromise the machine performance or the simplicity of the inverter and the controller. The work presented in this thesis shows that low torque ripple over a wide speed range can be achieved without severe penalties in terms of the machine performance and the size, cost and complexity of the power electronics and the controller. This is achieved by designing a 6-phase machine and driving it from a three-phase full bridge circuit. Switched reluctance motors with segmented rotors are a relatively recent advancement in the electromagnetic design of doubly-salient reluctance motors, having only been introduced in 2002. By replacing the conventional toothed rotor with individual segments, it has been proven that higher torque density than conventional switched reluctance machines could be achieved. Early work by Mecrow and El-Kharashi has demonstrated the operation of prototype machines with short-pitched and fully-pitched windings. The machine design work presented here builds on this early work by examining aspects of the machine design and its operation. Two six-phase machines – one with a segmented rotor and the other with a toothed rotor - have been designed. Performance comparisons have been made between the two six-phase machines and a three phase segmented rotor machine that was previously designed at Newcastle University. Additionally, a three phase single tooth winding and a two phase segmented rotor switched reluctance machine have been studied in simulation and experimentally. Detailed comparison of inverter ratings and machine efficiencies are made under equal conditions for a 2-phase machine driven from h-bridge and asymmetric half-bridge inverters. This is achieved with results from a test rig and the use of accurate dynamic simulation. Simulation models for 3-phase and 6-phase machines have also been generated. Detailed comparison of inverter ratings and machine efficiencies are made under equal conditions for the 3-phase and 6-phase drives in the dynamic simulation. Comparisons between simulated and measured results are shown to be very good for all of the drives.
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Barrass, Peter. "High Performance Switched Reluctance Drives". Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/136.
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The fully-pitched winding arrangement is one of the most radical changes in the design of doubly-salient reluctance motors in recent times. By replacing conventional shortpitched windings with fully-pitched windings, the resulting machine has a strong and position dependant mutual coupling between phases. The major torque producing mechanism is due to changes in mutual inductance with rotor position. This enables the windings to be better utilised, and with correct selection of excitation all phases can contribute useful torque all of the time. The increased winding utilisation requires a lower MMF per phase in comparison with a short-pitch wound machine with a single phase excited. Given a suitable winding configuration and machine dimensions, the copper losses for a given torque can be significantly lower than an equivalent conventional switched reluctance machine. Operation of a three phase fully-pitched winding switched reluctance machine has been studied theoretically, in simulation and experimentally. The experimental drive comprises of a D132 frame 12:8 machine, IGBT power converter and DSP controller. Operation with unipolar phase currents has been investigated over a wide speed range and performance compared with a conventional switched reluctance machine. Bipolar operation with several different excitation patterns has been investigated. Unipolar operation gives the largest torque/speed envelope with a simple controller, although bipolar modes can equal this with a more complex controller. Results show that for equal RMS phase current the average torque produced by four different modes of excitation are approximately equal. However, there is a large difference in the torque ripple and acoustic noise performance of each mode. Current control in switched reluctance machines is complicated by the non-linear nature of the load. By controlling flux-linkage rather than current a linear load model can be used. A discrete time 'dead-beat' flux-linkage controller has been implemented which gives superior phase current control performance to other types of controller with the same sample interval. A new method of constant torque operation based on 'flux ramps' has been proposed. This method gives predictable performance and enables constant torque operation over a wide speed range. A Genetic Algorithm has been shown to be very effective when applied to the problem of optimising the 'flux ramps' for minimum torque ripple. A speed controller has been implemented which makes use of the Genetic Algorithm optimised flux ramps to give smooth torque over a wide speed range.
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Amreiz, Hassan Musa. "Transverse flux switched reluctance motors". Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270782.
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Noorizadeh-Ardebili, M. R. "Switched/continual mode circuit simulation". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261542.
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Bagula, Bigomokero Antoine. "Traffic engineering label switched paths". Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/53196.
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Thesis (MSc)--Stellenbosch University, 2002.ENGLISH ABSTRACT: The Internet is evolving into a commercial platform requiring enhanced protocols and an expanded physical infrastructure allowing a better delivery from IP. Multi-protocol Label Switching (MPLS) is a technology enabling traffic engineering and virtual private network (VPN) provisioning. MPLS achieves traffic engineering by carrying the traffic over virtual connections called Label Switched Paths (LSPs) which are engineered based on QoS requirements such as delay, jitter and packet loss minimization or throughput maximization. This thesis proposes path finding and traffic distribution methods to be deployed in MPLS networks for traffic engineering LSPs. A flow optimization model based on a pre-planned routing approach separating path finding and traffic distribution is presented. This model is augmented by a threshold routing approach which routes the traffic based on thresholds expressing the maximum load level reached by network links. This routing approach moves the traffic away from thresholdmarked links to achieve low-utilized links/paths. The performance and routing capabilities of these methods are evaluated through designed software. A routing architecture implementing a two-layer signalling model for MPLS network is proposed and evaluated through simulation. v
AFRIKAANSE OPSOMMING:Die verandering van die Internet in 'n kommersiele platform met verbeterde protokolle en 'n uitgebreide fisieke infrastruktuur stel die internetprotokol (IP) in staat tot beter lewering. Multiprotokol- etiketskakeling (MPLS), is 'n tegnologie vir die voorsiening van televerkeerbeheer en virtuele privaatnetwerke (VPN). MPLS verskaf televerkeerbeheer deur die verkeer te dra oar virtuele konneksies, wat bekend staan as etiketgeskakelde paaie, waarvan die ontwerp gebaseer is op vereistes vir diensgehalte soos vertraging, ritteling en die minimering van pakketverlies of maksimering van deurvoer. Hierdie tesis stel nuwe padvind- en verkeerdistribusiemetodes voor wat aangewend word in MPLSnetwerke om etiketgeskakelde paaie te beheer. 'n Model vir vloei-optimering-gebaseer op voorafbeplande roetering wat padvinding en verkeerdistribusie skei-word aangebied. Hierdie model word uitgebrei deur 'n benadering van drempelroetering wat die verkeer roeteer en gebaseer is op drempels wat die maksimum ladingsvlak voorstel wat bereik kan word deur netwerkskakels. Hierdie roeteringsbenadering skuif die verkeer weg van drempelgemerkte skakels en bereik daardeur laaggebruikte skakelsjpaaie. Die prestasie en roeteringsvaardigheid van hierdie metodes word gevalueer deur selfontwikkelde programmatuur. 'n Argitektuur vir roetering wat 'n dubbellaagseinmodel implementeer vir 'n MPLS-netwerk, word aangebied en gevalueer met simulasie.
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El-Kharashi, Eyhab Aly Kamel. "Segmented rotor switched reluctance motors". Thesis, University of Newcastle upon Tyne, 2003. http://hdl.handle.net/10443/3112.
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This thesis introduces and researches the concept of a new form of switched reluctance motor, in which the rotor is made from a series of discrete segments. Single phase machines are initially examined and design rules established. Predictions of air-gap force density are compared with toothed rotor equivalents and it is shown that much greater force densities are theoretically possible with the segmental design. The thesis then proceeds to apply the concepts developed to two different three phase configurations, which show particular advantages. Two demonstrator machines are designed and built, and their method of construction described. Measured static test results are initially presented for each machine and compared with a conventional switched reluctance motor of the same dimensions, revealing both the advantages and disadvantages of the two segmental rotor configurations. Both demonstrator machines are then run as SRM drives, with the current to each phase supplied from an asymmetric half bridge converter. The current and voltage waveforms are monitored, along with measurements of mean torque output. Waveforms are compared with those predicted by simulations and conclusions are drawn regarding the performance of the drive systems. The results of this work clearly demonstrate that segmental rotor SRMs have much greater torque capability than conventional toothed geometries. Of the two demonstrator machines constructed, one has a very high torque per unit loading, but has relatively long end-windings; the other has slightly reduced torque per unit loading but overcomes the problem of long end-windings. Both machines appear to outperform other forms of reluctance motor.
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Jong, Owen. "Multi Resonant Switched-Capacitor Converter". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/88019.
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This thesis presents a novel Resonant Switched-Capacitor Converter with Multiple Resonant Frequencies, abbreviated as MRSCC for both high density and efficiency non-isolated large step-down Intermediate Bus Converter (IBC). Conventional Resonant Switched-Capacitor Converter (RSCC) proposed by Shoyama and its high voltage conversion ratio derivation such as Switched-Tank Converter (STC) by Jiang and li employ half sinusoidal-current charge transfer method between capacitors to achieve high efficiency and density operation by adding a small resonant inductor in series to pure switched-capacitor converter's (SCC) flying capacitor. By operating switching frequency to be the same as its resonant frequency, RSCC achieves zero-current turn off operation, however, this cause RSCC and its derivation suffer from component variation issue for high-volume adoption. Derived from RSCC, MRSCC adds additional high frequency resonant component, operates only during its dead-time, by adding small capacitor in parallel to RSCC's resonant inductor. By operating switching frequency higher than its main resonant frequency, MRSCC utilizes double chopped half-sinusoidal current charge transfer method between capacitors to further improve efficiency. In addition, operating switching frequency consistently higher than its resonant frequency, MRSCC provides high immunity towards component variation, making it and its derivation viable for high-volume adoption.MS
Following the recent trend, most internet services are moving towards cloud computing. Large data applications and growing popularity of cloud computing require hyperscale data centers and it will continue to grow rapidly in the next few years to keep up with the demand [4]. These cutting-edge data centers will require higher performance multi-core CPU and GPU installations which translates to higher power consumption. From 10MWatts of power, typical data centers deliver only half of this power to the computing load which includes processors, memory and drives. Unfortunately, the rest goes to losses in power conversion, distribution and cooling [5]. Industry members look into increasing backplane voltage from 12V to 48V in order to reduce distribution loss. This thesis proposes a novel Resonant Switched-Capacitor Converter using Multiple Resonant Frequencies to accommodate this increase of backplane voltage.
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Skowronn, Dietmar Reinhard. "Simulation of Switched Linear Networks". PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/4644.
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This thesis deals with the time-domain analysis of switched linear networks and investigates inherent problems which have to be considered when analyzing this class of networks. Computer simulation requires the use of numerical methods and we focus on the transmission -line modelling technique (TLM) and the numerical inverse Laplace transform. A general approach based on the one-graph modified nodal description is given which allows the formulation of circuit equations of a TLM-modelled circuit by inspection. The numerical equivalence of TLM and trapezoidal rule has been found and a proof is given. A variable step size simulator has been developed based on the 4th order numerical inverse Laplace transform. The properties of this method are reviewed and its limitations are discussed. Simulation results are given to illustrate capabilities of the simulator.
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Carniato, Leonardo Ataide. "Robust H∞ switched static output feedback control design for linear switched systems subject to actuator saturation /". Ilha Solteira, 2019. http://hdl.handle.net/11449/183007.
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Orientador: Marcelo Carvalho Minhoto TeixeiraResumo: Este trabalho dedica-se ao estudo do problema de controle robusto envolvendo custo H∞ para sistemas lineares chaveados no tempo contínuo, sujeitos à saturação no atuador e com incertezas politópicas, considerando leis de chaveamento e controladores chaveados dependentes da saída da planta. Os métodos propostos oferecem novas condições baseadas em Desigualdades Matriciais Lineares (LMIs - do inglês, Linear Matrix Inequalities) para o projeto de controladores chaveados utilizando funções de Lyapunov dependentes de parâmetros. O método é baseado em um resultado recentemente introduzido na literatura para o projeto de controle H∞ de saída o qual evita igualdades matriciais lineares (LMEs - do inglês, Linear Matrix Equalities) e a necessidade de impor restrições nas matrizes de saída do sistema, isto é, as matrizes de saída do sistema podem ser de posto linha incompleto. Com o objetivo de estender estes resultados, a restrição de saturação no atuador é estudada. Análises teóricas e resultados de simulações mostram que os novos procedimentos são menos conservativos quando comparados a métodos publicados recentemente na literatura. No método proposto, as condições são uma classe particular de desigualdades matriciais bilineares (BMIs - do inglês, Bilinear Matrix Inequalities), as quais contêm alguns termos bilineares devido à multiplicação de matrizes por escalares. Estes termos estão relacionados à combinação convexa das matrizes de chaveamento bem como a outros parâmetros escalare... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This thesis is devoted to the study of the robust H∞ control problem of continuous-time switched linear systems subject to actuator saturation with polytopic uncertainties, considering an output-dependent switching law and a switched static output feedback controller. The proposed method offers new sufficient conditions based on linear matrix inequalities (LMIs) for designing the switched controllers using parameter-dependent Lyapunov functions. The method is based on a static output feedback H∞ control design recently presented in the literature that avoids linear matrices equalities (LMEs) and the need to impose any constraints on output system matrices, that is, the output matrices of the system are allowed to be of non-full row rank. In order to extend those results, the actuator saturation constraint is also studied. Theoretical analyses and simulation results show that these new procedures are less conservative than recent methods available in the literature. The conditions of the proposed methods are a particular class of Bilinear Matrix Inequalities (BMIs), which contain some bilinear terms as the product of a matrix and a scalar, related to a suitable convex combination and scalars parameters to provide extra free dimensions in the solution space. The hybrid algorithm Differential Evolution-Linear Matrix Inequality (DE-LMI), is proposed for obtaining feasible solutions of this particular NP-hard problem. Examples show that the proposed methodologies reduce the design ... (Complete abstract click electronic access below)
Doutor
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Motamedi-Sedeh, Ardeshir. "Speed control of switched reluctance motors". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28241.pdf.
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Qin, Ling. "A permanent-magnet switched-flux generator". abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3210935.
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Jonsson, Andreas. "Studies on heterogeneous packet switched networks /". Luleå, 2005. http://epubl.luth.se/1402-1757/2005/056.
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Song, Irene. "Switched-current filters using bilinear integrators". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26420.
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The growing popularity of switched-current technology as a replacement for the well-established switched-capacitor technology has led to interest in exploring switched-current implementations of sampled-data functions, such as filtering. This thesis presents the design, implementation and measured results of a 5th-order switched-current Chebyshev filter. The filter's signal-flow-graph is derived from an LC ladder and is composed of basic building blocks of bilinear integrators. The design process by which this is achieved is the subject of one chapter. These bilinear integrators are based upon a novel switched-current integrator designed by the author. Using models from Northern Telecom's 1.2 $ mu$m CMOS4S process, simulation results of the filter, the novel switched-current integrator and its building block of switched-current memory cells will be shown and compared with the experimentally measured results.
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Wall, Simon Robert. "Control of switched-mode power converters". Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362966.
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Darwish, M. K. E.-S. "Switched-capacitor filters for power applications". Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375203.
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Pun, C. K. "Frequency analysis of switched capacitor networks". Thesis, University of Hull, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383753.
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Lin, Zhengyu. "Advanced control of switched reluctance motors". Thesis, Heriot-Watt University, 2005. http://hdl.handle.net/10399/266.
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Charton, Jean Thomas. "Iron losses in switched reluctance machine". Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421441.
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Patel, Nareshkumar Maganlal. "Models of circuit-switched interconnection networks". Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47612.
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Tang, Xinke. "Optically switched quantum key distribution network". Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/289444.
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Encrypted data transmission is becoming increasingly more important as information security is vital to modern communication networks. Quantum Key Distribution (QKD) is a promising method based on the quantum properties of light to generate and distribute unconditionally secure keys for use in classical data encryption. Significant progress has been achieved in the performance of QKD point-to-point transmission over a fibre link between two users. The transmission distance has exceeded several hundred kilometres of optical fibre in recent years, and the secure bit rate achievable has reached megabits per second, making QKD applicable for metro networks. To realize quantum encrypted data transmission over metro networks, quantum keys need to be regularly distributed and shared between multiple end users. Optical switching has been shown to be a promising technique for cost-effective QKD networking, enabling the dynamic reconfiguration of transmission paths with low insertion loss. In this thesis, the performance of optically switched multi-user QKD systems are studied using a mathematical model in terms of transmission distance and secure key rates. The crosstalk and loss limitations are first investigated theoretically and then experimentally. The experiment and simulation both show that negligible system penalties are observed with crosstalk of -20 dB or below. A practical quantum-safe metro network solution is then reported, integrating optically-switched QKD systems with high speed reconfigurability to protect classical network traffic. Quantum signals are routed by rapid optical switches between any two endpoints or network nodes via reconfigurable connections. Proof-of-concept experiments with commercial QKD systems are conducted. Secure keys are continuously shared between virtualised Alice-Bob pairs over effective transmission distances of 30 km, 31.7 km, 33.1 km and 44.6 km. The quantum bit error rates (QBER) for the four paths are proportional to the channel losses with values between 2.6% and 4.1%. Optimising the reconciliation and clock distribution architecture is predicted to result in an estimated maximum system reconfiguration time of 20 s, far shorter than previously demonstrated. In addition, Continuous Variable (CV) QKD has attracted much research interest in recent years, due to its compatibility with standard telecommunication techniques and relatively low cost in practical implementation. A wide band balanced homodyne detection system built from modified off-the-shelf components is experimentally demonstrated. Practical limits and benefits for high speed CVQKD key transmission are demonstrated based on an analysis of noise performance. The feasibility of an optically switched CV-QKD is also experimentally demonstrated using two virtualised Alice-Bob pairs for the first time. This work represents significant advances towards the deployment of CVQKD in a practical quantum-safe metro network. A method of using the classical equalization technique for Inter-symbol-interference mitigation in CVQKD detection is also presented and investigated. This will encourage further research to explore the applications of classical communication tools in quantum communications.
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Rinehart, Michael David. "Optimal control of controllable switched systems". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33201.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 83-85).
Many of the existing techniques for controlling switched systems either require the solution to a complex optimization problem or significant sacrifices to either stability or performance to offer practical controllers. In [13], it is shown that stabilizing, practical controllers with meaningful performance guarantees can be constructed for a specific class of hybrid systems by parameterizing the controller actions by a finite set. We extend this approach to the control of controllable switched systems by constraining the switching portion of the control input and fixing the feedback controller for each subsystem. We show that, under reasonable assumptions, the resulting system is guaranteed to converge to the target while providing meaningful performance. We apply our approach to the direct-injection stratified charge (DISC) engine and compare the results to that of a model predictive controller designed for the same application.
by Michael David Rinehart.
S.M.
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Chen, Minjie Ph D. Massachusetts Institute of Technology. "Stacked switched capacitor energy buffer architecture". Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/73699.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 133-134).
Electrolytic capacitors are often used for energy buffering applications, including buffering between single-phase ac and dc. While these capacitors have high energy density compared to film and ceramic capacitors, their life is limited and their reliability is a major concern. This thesis presents a series of stacked switched capacitor (SSC) energy buffer architectures which overcome this limitation while achieving comparable effective energy density without electrolytic capacitors. The architectural approach is introduced along with design and control techniques which enable this energy buffer to interface with other circuits. A prototype SSC energy buffer using film capacitors, designed for a 320 V dc bus and able to support a 135 W load has been built and tested with a power factor correction circuit. This thesis starts with a detailed comparative study of electrolytic, film, and ceramic capacitors, then introduces the principles of SSC energy buffer architectures, and finally designs and explains the design methodologies of a prototype circuit. The experimental results successfully demonstrate the effectiveness of the approach.
by Minjie Chen.
S.M.
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KRUTKO, OLEG B. "OPTICALLY SWITCHED INTEGRATED CIRCUIT POWER CONVERTERS". University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin973790864.
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Ifqir, Sara. "Interval observers for switched dynamical systems". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLE034.
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Les systèmes dynamiques à commutation sont particulièrement adaptés pour la représentation de la dynamique de nombreux processus et systèmes réels. De fait, la synthèse d'observateurs d'état pour cette classe de systèmes a suscité un intérêt croissant, auprès des chercheurs, au cours des dernières décennies. Cette thèse a pour objectif le développement de méthodologies générales d'estimation d'état robuste pour les systèmes dynamiques à commutation présentant des incertitudes paramétriques, des perturbations externes et/ou des bruits de mesure. Les méthodologies proposées sont fondées sur les approches dites ensemblistes où seules les bornes supérieures et inférieures des variables incertaines sont requises. La présente thèse contribue et résout le problème de l'estimation par intervalle pour les systèmes à commutation en utilisant deux paradigmes : i) Les observateurs par intervalle basés sur la théorie des systèmes coopératifs : où de nouvelles structures d'observateurs par intervalle sont introduites et démontrent certains avantages par rapport aux observateurs classiques. Les conditions suffisantes de stabilité et de coopérativité de l'erreur d'estimation sont fournies sous forme d'inégalités matricielles linéaires (LMI) obtenues en combinant la théorie de Lyapunov et le concept de stabilité entrée-état. Afin d'améliorer la robustesse de l'estimation, une borne supérieure sur l'erreur est garantie et optimisée pour une meilleure précision. ii) Les observateurs par intervalle basés sur la théorie des ensembles : Dans un premier temps, les observateurs par commutation basés sur une caractérisation des bornes de l'erreur d'estimation sont proposés. Ensuite, une nouvelle approche d'estimation d'état zonotopique basée sur la minimisation du rayon du zonotope est développée. Cette méthode repose sur la résolution d'un problème d'optimisation sous contraintes LMIs. Les contributions susmentionnées ont été appliquées à l'estimation d'état et à la détection de défauts dans la dynamique latérale des véhicules. Les algorithmes proposés sont testés sur des données acquises avec des véhicules instrumentés afin de démontrer leur pertinence et leur efficacitéConsidering that many processes and systems in real world applications can be modeled as switched systems, observers synthesis for this class of systems has received a growing interest in the last decades. This thesis intends to provide some contributions to the state-of-the-art in the field of robust state estimation for Switched Dynamical Systems subject to unknown parameters, external disturbances and/or measurement noise. One of the main feature of this dissertation regarding the available literature is that, no statistical evaluation of uncertainties is needed, only the knowledge of the interval boundaries to which these latter belong is required. The proposed methodologies are based on the so-called set-based approaches which provide an estimate of the set of admissible values of the state vector at each time-instant. The present thesis contributes and solves the problem of robust state bounding estimation using two paradigms which are: i) Interval Observer techniques based on cooperative system theory: where new interval observer structures are introduced and shown to have certain advantages over the classical interval observers when studying robustness and cooperativity issues. Sufficient conditions for proving the stability and cooperativity of the interval observer estimation error are provided in terms of Linear Matrix Inequalities (LMIs) constraints obtained using a combination of Lyapunov theory and Input-to-State Stability concept. In order to enhance the estimation accuracy and robustness, an explicit bound of the interval error is guaranteed and optimized for better estimation precision. ii) Set-membership observer techniques based on set theory: where switched observers based on interval characterization of the estimation error are proposed first. Next, new zonotopic state estimation approach based on minimizing the radius of the zonotope is developed. In this spirit, new method leading to the resolution of an optimization problem in the form of LMIs has been proposed. The above-mentioned contributions have been applied to state estimation and Fault Detection in Vehicle Lateral Dynamics. Application to real data recorded with a prototype equipped vehicle demonstrates the relevance and efficiency of the proposed approaches
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Gai, Yingkun. "Noise analysis for switched-capacitor circuitry". [Ames, Iowa : Iowa State University], 2008.
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Babaali, Mohamed. "Switched Linear Systems: Observability and Observers". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04122004-073020/unrestricted/babaali%5Fmohamed%5F200405%5Fphd.pdf.
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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2004.Verriest, Erik, Committee Member ; Wardi, Yorai, Committee Member ; Yezzi, Anthony, Committee Member ; Wang, Yang, Committee Member ; Egerstedt, Magnus, Committee Chair. Vita. Includes bibliographical references (leaves 80-85).
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Chumacero, Polanco Erik. "Velocity sensorless control switched reluctance motors". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112062/document.
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Dans ce mémoire de thèse, nous présentons la conception, l'analyse de la stabilité, les simulations numériques et aussi les résultats des expérimentes concernant différents contrôleurs de vitesse mécanique du moteur à réluctance variable (MRV).Dans les deux premiers chapitres une brève description de la physique et de la construction du MRV est présenté ainsi que le problème du contrôle d'être abordé, c'est la commande de vitesse sans capteur. Il est aussi présenté l'état de l'art de ce problème et certains des solutions proposées dans d'autres travaux. On propose notre solution et on présente un petit résumé des articles scientifiques qui ont été publiés dans des magazines et des conférences.Dans le chapitre numéro trois est présenté le design du contrôleur adaptatif et sans capteur du MRV. On suppose, dans une première étape que seule la vitesse mécanique est inconnue et la stabilité exponentielle uniforme des erreurs de suivement est obtenue. Dans une deuxième étape, les conditions d'opération sont aggravées et, en plus de la vitesse, les paramètres physiques sont également supposées inconnues, la stabilité asymptotique uniforme est obtenue dans ce cas. L'estimation des paramètres du MRV est garantie grâce à la condition de persistance d'excitation. Cette commande se compose de deux boucles, une boucle interne basée sur un contrôleur de type PI2D qui est particulièrement intéressant parce qu'il est libre de modèle; cette boucle entraîne les variables mécaniques -la position et la vitesse- vers une référence désirée. Une deuxième boucle de contrôle externe prend le courant électrique vers un ' "courant de référence virtuelle" qui est généré sur la base d'une approche de partage de couple. Le contrôleur propose est testé au niveau de simulations numériques qui sont également présentés.Dans le quatrième chapitre, une nouvelle approche de modélisation du MRV est utilisée pour concevoir le contrôleur. Dans ce scénario, on suppose que l'ensemble de l'état et tous les paramètres physiques sont disponibles, cette approche est pensée pour être adapté au contrôleur basé sur observateur, recherche qui est en cours de développement. Le contrôleur est composé de deux boucles, également que celui qui a été mentionné précédemment. Ce contrôleur est sélectionné parce qu'il est approprié pour le contrôle d'équivalence vraie, qui il s'agit de remplacer les «mesures physiques» provenant d'un capteur par les «observations» provenant d'un observateur. La mise en oeuvre numérique est effectuée sur Simulink de Matlab.Enfin, dans le chapitre cinq, les résultats expérimentaux qui ont été effectués pour évaluer la performance des contrôleurs proposés -ce sont les PI2D et adaptatif PI2D pour le modèle simplifie ainsi que le PID pour le nouveau approche de modélisation- sont présentés. Dans la première partie, une brève description de la construction du banc de tests utilisé est présenté ainsi que quelques-unes caractéristiques techniques. Trois différentes profils de vitesse sont imposées à chacun des contrôleurs proposés -ce sont la tangente hyperbolique, la rampe saturée et la référence sinusoïdal- et de bonnes résultats sont obtenus en considérant que la variable contrôlée est la vitesse. Le dernier chapitre correspond aux conclusions de la recherche effectuée ainsi qu'aux travaux futursIn this thesis dissertation we present the design, stability analysis, numerical simulations and physical experiments of different controllers designed to drive the mechanical velocity of the switched reluctance motor (SRM). In the First and Second Chapters a brief description of the physics and construction of the SRM is presented, as well as the problem of control to be aboard, that is the velocity sensorless control of motors and the state of the art of this problem. The proposed solution is introduced and a summary of the published papers as well as the contribution are also presented.In the Chapter number three is presented the velocity sensorless and adaptive control of the SRM. It is assumed, in a first stage, that only mechanical velocity is unknown, uniform exponential stability of the errors is achieved in this scenario. In a second stage, conditions are stressed and in addition to the velocity, physical parameters are also assumed unknown, uniform asymptotical stability is achieved in this case and parameters estimation is guaranteed under a persistence of excitation condition. This controller consists of two loops, an internal loop based on a PI2D–type controller which is of particular interest given it is free-model; this loop drives the mechanical variables –that is position and velocity- towards a desired reference. An external control loop takes the electrical current towards a ‘’virtual” current reference which is generated based on a torque share approach. The controller is tested on numerical simulations, which are also presented.In the fourth chapter, a new approach on the modeling of the SRM is utilized to design the controller, in this scenario is assumed that the whole state and all the physical parameters are available, however this approach is thought to be suitable to observer based controller, whose ongoing research is being performed. The controller is composed by two loops, similarly to the one mentioned previously. This controller is selected because it is suitable for certainty equivalence control, that is, to substitute the “measurements” by the “observations” coming from a virtual sensor. Numerical implementation is performed on Simulink of Matlab.Finally, in the Chapter five, the experimental results carried out to evaluate the performance of the proposed controllers are presented, these are the PI2D and the adaptive PI2D controllers for the simplified model and the $PID$ controller for the novel modeling approach. In the first part, a brief description of the construction of the utilized bench is presented as well as the some technical characteristics. Three different velocity profiles were imposed to each of the overmentioned controllers –these are the so called smooth step, the saturated ramp and the sinusoidal reference- and good results, considering that the controlled variable is the velocity, were obtained. The last chapter corresponds to the conclusions of the performed research as well as to the future work
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Ansari, Fardin. "Circuit Modeling of Switched Linear Networks". PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4658.
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The use of switched linear networks is prevalent in power processing systems such as dc-to-dc power converters. These converters provide regulated dc output power and are widely used in the power supplies for computers and peripherals. As with most systems where high performance is a criterion, the power converter is usually enclosed in a feedback loop. Feedback design usually entails the use of small signal (linear) models with linear feedback design techniques. There exists a large number of small signal models, but most of them are ad hoc. A describing function approach has previously been presented which determines the exact small signal frequency response of the converters. This method is now used to systematically derive circuit models for power converters. The aim of the work presented in this thesis is to model the nonlinear part of the switching converters which are simply the switches. This study is focused on the Pulse Width Modulation (PWM) class of converters. Majority of available models are not very accurate because they are averaged models. The aim of the new approach is to obtain accurate and simple model. A partial realization of this aim has been achieved; the new model is accurate over a very wide frequency range, but presently the parameters are rather complicated.
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El-Rifai, Khalid 1979. "Robust adaptive control of switched systems". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39897.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.Includes bibliographical references (leaves 141-149).
In this thesis, robust adaptive controllers are developed for classes of switched nonlinear systems. Switched systems are those governed by differential equations, which undergo vector field switching due to sudden changes in model characteristics. Such systems arise in many applications such as mechanical systems with contacts, electrical systems with switches, and thermal-fluidic systems with valves and phase changes. The presented controllers guarantee system stability, under typical adaptive control assumptions, for systems with piecewise differentiable bounded parameters and piecewise continuous disturbances without requiring a priori knowledge on such parameters or disturbances. The effect of plant variation and switching is reduced to piecewise continuous and impulsive inputs acting on a Bounded Input Bounded State (BIBS) stable closed loop system. This, in turn, provides a separation between the robust stability and robust performance control problems. The developed methodology provides clear guidelines for steady-state and transient performance optimization and allows for parameter scheduling and multiple model controller adjustment techniques to be utilized with no stability concerns. The results are illustrated for various systems including contact-based robotic manipulation and Atomic Force Microscope (AFM) based nano-manipulation.
by Khalid El Rifai.
Ph.D.
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Thorogood, Alexander. "Switched Intelligent Grid Network System (SIGNS)". Thesis, Thorogood, Alexander (2014) Switched Intelligent Grid Network System (SIGNS). Masters by Coursework thesis, Murdoch University, 2014. https://researchrepository.murdoch.edu.au/id/eprint/22894/.
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This report considers the research, analysis and development of an alternative process for controlling end-user electrical power quality, as well as reflected load modulation and transients on the incoming electricity supply grid. In the past, power quality issues associated with the grid network, were usually generated by the connected loads, this has changed in today’s grid system with embedded intermittent renewable energy being included on the energy profile. The intermittency of the added input is being smoothed by the large scale generation on the network. A high level of renewable penetration is said to have been reached when additional effort is required to optimise PV integration.
The analysis is built on the assumption that the electrical supply grid will continue to play a vital role in supplying electrical energy to industry and domestic customers for the foreseeable future.
A report released in 2009 by the Australian Federal Government in Smart Grid Technologies recognised that through a communications network the consumer could play a vital role in maintaining power quality, offsetting peak loading and integrating embedded power generation.
The concept of Switched Intelligent Grid Networking Systems (SIGNS) to control end-user electrical power quality is to act as an intelligent buffer between the electrical grid supply and the load to select the most appropriate energy source. In addition SIGNS could effectively absorb a proportion of any surges and transients, at the same time as offering a path for augmented alternative energy. The concept is built on a harvest, storage model as illustrated below (rain water tank water storage). In this system energy, like water, is collected over a period of time, stored and then used as required, allowing the storage medium to absorb peaks and surges in power.
Over the past five years domestic energy costs to the consumer have risen by 91%, this cost has not been driven entirely by production of energy, but more so by;
• the expense of maintaining power quality over the distribution network,
• the cost of money, the global financial crisis and availability of funds,
• aging infrastructure,
• the complexity of the distribution of and the uncontrolled nature of, feed-in generators,
• growth in demand,
It is expected that the price of electricity will experience further increases as the Advanced Metering Infrastructure AMI is rolled out to accommodate the complexity of metering across the National Energy Market (NEM) and the Wholesale Energy Market in Western Australia (WEM), which is expected to be completed by 2017. The price of electrical energy between 2017 and 2018 is expected to be stable because increases in energy costs will be offset by the reductions in costs associated with rolling out the AMI.
The complexities of power distribution networks, the growing demand for efficiency providing cheaper energy and the increased demand for power quality are eroding the viability of the current network structure. The tried and proven method of maintaining stability by oversizing the generating capacity is at odds with deregulation and the struggle for new efficiencies. If the suppliers were to refocus energy quality as a joint responsibility of both suppliers and consumers, it would possibly enable the existing infrastructure in the NEM and WEM to extend its offerings, increase efficiency and potentially lower energy costs.
The research undertaken vii exposed a number of problems associated with switching energy systems in and out of the network, in particular when switching inductive loads with poor power factors (pf). These factors are exacerbated where the final switching components, utilise mechanical devices, which also further impede efforts to synchronise power sources. Use of these devices is a requirement of AS/NZ 3000 clause 2.3.22, where it is stated that generation equipment must be isolated via a mechanical contact. Nevertheless, research into, Switched Intelligent Grid Network Systems (SIGNS) has shown that it is possible to;
• increase the renewable energy component, assisting the grid, without actually exporting energy to the grid,
• assist in maintaining energy quality to within specified limits,
• offer a degree of autonomy from the grid, especially during power outages,
• reduce peak loading on the grid,
• lower greenhouse emissions through improved efficiency and solar energy harvesting.
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Al-Harthi, Saleh. "Service-curve based algorithms for scheduling with quality-of-service guarantees in packet-switched networks and switches /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3022225.
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Hudson, Christopher Allen. "Single-Phase, Single-Switch, Sensorless Switched Reluctance Motor Drive Utilizing a Minimal Artificial Neural Net". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34735.
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Artificial Neural Networks (ANNs) have proved to be useful in approximating non-
linear systems in many applications including motion control. ANNs advocated in
switched reluctance motor (SRM) control typically have a large number of neurons
and several layers which impedes their real time implementation in embedded sys-
tems. Real time estimation at high speeds using these ANNs is diffcult due to the
high number of operations required to process the ANN controller. An insuffcient
availability of time between two sampling intervals limits the available computation
time for both processing the neural net and the other functions required for the motor
drive. One ideal application of ANNs in SRM control is rotor position estimation. Due
to reliability issues, elimination of the rotor position sensors is absolutely required for
high volume, high speed and low cost applications of SRM's. ANNs provide a means
by which drive designers can implement position sensorless drive technology that is
both robust and easily implemented.
It is demonstrated that a new and novel ANN configuration can be implemented
for accurate rotor position estimation in a sensorless SRM drive. Consisting of just
4 neurons, the neural estimator is the smallest of its kind for SRM rotor position
estimation. The breakthrough that provided the reduction was the addition of a non-
linear input. Typical input spaces for SRM position neural estimators consist of both
current,and fux-linkage. The neural network was trained on-line using these
inputs and a third, non-linear input provided by a preprocessed product of the two
typical inputs.Master of Science
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Balakrishnan, Anand Kumar. "Soft switched high frequency ac-link converter". [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3156.
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Kenning, Raymond. "Modeling switched circuit network systems using PLANITU /". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Dec%5FKenning.pdf.
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Hirche, Sandra. "Haptic telepresence in packet switched communication networks". [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=978116488.
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Helfenstein, Markus. "Analysis and design of switched-current networks /". Zürich, 1997. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12257.
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Shih-HaoYe i 葉士豪. "Switch Angle Control for Switched Reluctance Motor". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/rp8jm2.
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Hsu, Po-Chun, i 許博鈞. "Efficient Switch scheduling for Circuit-Switched On-Chip Networks". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/76297397492062974429.
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碩士國立東華大學
資訊工程學系
93
System-on-chip (SoC) design provides integrated solutions to many applications such as computer systems, telecommunications, multimedia, consumer electronics, etc. One of the major challenges of designing a SoC chip is the communication architecture between heterogeneous components running different frequencies and possessing different characteristics. Most of the current communication architectures in SoC are based on dedicated wires and buses. As systems grow in complexity, the on-chip communication is expected to become critical for performance, power consumption, reliability, etc. However, the dedicated wiring and bus architectures have their limitation and do not meet these requirements. For next-generation SoC design, circuit-switched and packet-switched networks delivering messages between communicating components have been proposed. Such architecture is called network-on-chip (NoC) or micronetwork. In this thesis, we propose a scheduling scheme that efficiently schedules the connections in the switches in circuit-switched NoC architectures. The cost and latency of the switch in the circuit-switched network can be lowered down with our scheduler. Our algorithm uses three steps to solve these scheduling problems in circuit-switched networks. We translate the connection requirement table of a switch to the bandwidth requirement table with contention freedom in the first step. The second step is to assign the bandwidth requirement table with proper time slots and also calculate the waiting time in the output time slot table. And the last step is to optimize the output time slot table depend on the requirements to lower down the total waiting time in the NoC architecture. For having even more improvement in the future, we show the simulation results of the proposed algorithm to validate our ideas.
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Chen, Han-Yang, i 陳翰諹. "A Novel Soft-Switched Boost Converter Using Switched Capacitor Technology". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/71863008324771777317.
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碩士國立臺灣海洋大學
電機工程學系
93
Abstract This paper proposes a novel boost converter. Its topology is based on basic boost converter. Use the Switched-Capacitor technology. This technology made the voltage gain(1/(1-D)) more than basic boost converter((1+D)/(1-D)). Add the Soft-Switched circuit into the novel boost converter, decrease the switching losses. In this paper, I use formula 、 IsSpice and experiment to verify converter of circuit characteristics.