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1
Zahir, Bashir Ahmad. "A variable-speed constant-frequency self-excited induction generator." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/35068.
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The thesis describes the design and development of a stand-alone variable-speed constant-frequency self-excited induction generator, using field-oriented control techniques to provide the necessary voltage and frequency control. Open- and closed-loop models are developed for the generator using tensor techniques and these are subsequently used in the control system design and simulation. For the closed-loop system, both conventional and field-oriented control strategies are developed. A laboratory-scale system was designed and built, to illustrate the system performance. The generator is driven by a separately-excited DC motor to simulate a variable-speed wind turbine and a 2.2kW wound rotor induction machine is used as the generator. The generator excitation current is provided by a current-controlled voltage-source inverter.
2
Bell, Peter Alan. "An induction machine model for optimisation of self-excited induction generator windings." Thesis, Nottingham Trent University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309819.
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Caliskan, Ahmet. "Constant Voltage, Constant Frequency Operation Of A Self-excited Induction Generator." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606678/index.pdf.
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In this thesis, control schemes for the self-excited induction generator are developed with Matlab/Simulink. Self-excited induction generator is considered as a constant voltage-constant frequency supply for an isolated load. A wind turbine is assumed to be the variable-speed drive of the induction generator. Control schemes aim to ensure a constant voltage-constant frequency operation of the induction generator in case of the variations in the wind speed and/or the load.
From the general model of the self-excited induction generator, the characteristics of the system and the dynamic responses of the system in case of any disturbance are
examined. Next, the control strategies are developed both for the squirrel-cage rotor induction generator and for the wound-rotor induction generator. Two control loops are necessary for constant voltage-constant frequency operation of a variable speed induction generator, one for the voltage regulation and the other for the frequency regulation. After developing the control loops, constant voltage-constant frequency
operation of the self-excited induction generator is simulated with a cage type saturation adaptive induction generator, a fixed capacitor with thyristor controlled reactor (TCR) used for frequency regulation and switched external resistors
connected to the stator terminals used for voltage regulation.
4
Ma, Dandan. "Self-excited induction generator : a study based on nonlinear dynamic methods." Thesis, University of Newcastle Upon Tyne, 2012. http://hdl.handle.net/10443/1478.
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An induction generator offers advantages in terms of its low cost, simplicity, robust construction, nature protection against short circuits and ease of maintenance in today’s renewable energy industry. However, the need for an external supply of reactive power (to produce a rotating magnetic flux wave) limits the application of an induction machine as a standalone generator. It is possible for an induction machine to operate as a Self-excited Induction Generator (SEIG) if capacitors are connected to the stator terminals in order to supply the necessary reactive power to achieve generating electrical energy in remote areas. Poor voltage and frequency regulation is the main drawback of a SEIG as the system is highly dynamic under variable load conditions. The regulation of speed and voltage does not result in a satisfactory level although many studies have been focused on this topic in the past. Therefore, the aim of the thesis is to provide a better understanding of the behaviour of a smooth airgap, selfexcited, squirrel cage induction generator as a nonlinear dynamic system when operating under a variety of load conditions, which would hopefully contribute to the development of a better regulated/controlled, viable SEIG system. Allowing for the cross-saturation nonlinear effect, a mathematical Simulink, d -q axis model of the SEIG system utilising currents as state space variables is developed and verified by both the experimental results and numerical analysis. The SEIG computer model is constructed and tested using Matlab/Simulink R2010b throughout the thesis. The self-autonomous system is shown to exhibit a transition from a stable periodic orbit to a quasi-periodic orbit (leading to likely chaotic motion) through a Neimark bifurcation, as a result of small changes in the values of system parameters (such as load resistance, load inductance, rotational speed and self-excitation capacitance). This characteristic dynamic behaviour of the SEIG system is firstly identified in this work and is verified experimentally using a laboratory test rig. The stability of the periodic and quasi-periodic orbits exhibited by the SEIG system when feeding an inductive load ( RL) is numerically analysed and the movement of the eigenvalues of the system’s characteristic matrix when changing a system parameter is presented to verify the qualitative change in system behaviour from a stable period-one orbit to unstable quasi-periodicity. Eigenvalue technique is successfully applied to assess the stability of the period-one and quasi-periodic orbits of the SEIG when feeding variable load conditions.
5
Seyoum, Dawit Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "The dynamic analysis and control of a self-excited induction generator driven by a wind turbine." Awarded by:University of New South Wales. School of Electrical Engineering & Telecommunications, 2003. http://handle.unsw.edu.au/1959.4/22008.
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This thesis covers the analysis, dynamic modelling and control of an isolated selfexcited induction generator (SEIG) driven by a variable speed wind turbine. The voltage build up process of an isolated induction generator excited by AC capacitors starts from charge in the capacitors or from a remnant magnetic field in the core. A similar voltage build up is obtained when the isolated induction generator is excited using an inverter/rectifier system with a single DC capacitor on the DC link of the converter. In this type of excitation the voltage build up starts from a small DC voltage in the DC link and is implemented using vector control. The dynamic voltage, current, power and frequency developed by the induction generator have been analysed, simulated and verified experimentally for the loaded and unloaded conditions while the speed was varied or kept constant. Results which are inaccessible in the experimental setup have been predicted using the simulation algorithm. To model the self excited induction generator accurate values of the parameters of the induction machine are required. A detailed analysis for the parameter determination of induction machines using a fast data acquisition technique and a DSP system has been investigated. A novel analysis and model of a self-excited induction generator that takes iron loss into account is presented in a simplified and understandable way. The use of the variation in magnetising inductance with voltage leads to an accurate prediction of whether or not self-excitation will occur in a SEIG for various capacitance values and speeds in both the loaded and unloaded cases. The characteristics of magnetising inductance, Lm, with respect to the rms induced stator voltage or magnetising current determines the regions of stable operation as well as the minimum generated voltage without loss of self-excitation. In the SEIG, the frequency of the generated voltage depends on the speed of the prime mover as well as the condition of the load. With the speed of the prime mover of an isolated SEIG constant, an increased load causes the magnitude of the generated voltage and frequency to decrease. This is due to a drop in the speed of the rotating magnetic field. When the speed of the prime mover drops with load then the decrease in voltage and frequency will be greater than for the case where the speed is held constant. Dynamic simulation studies shows that increasing the capacitance value can compensate for the voltage drop due to loading, but the drop in frequency can be compensated only by increasing the speed of the rotor. In vector control of the SEIG, the reference flux linkage varies according to the variation in rotor speed. The problems associated with the estimation of stator flux linkage using integration are investigated and an improved estimation of flux linkage is developed that compensates for the integration error. Analysis of the three-axes to two-axes transformation and its application in the measurement of rms current, rms voltage, active power and power factor from data obtained in only one set of measurements taken at a single instant of time is discussed. It is also shown that from measurements taken at two consecutive instants in time the frequency of the three-phase AC power supply can be evaluated. The three-axes to twoaxes transformation tool simplifies the calculation of the electrical quantities.
6
Shokrollah-Timorabadi, Hamid. "Voltage source inverter for voltage and frequency control of a stand-alone self-excited induction generator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0009/MQ34139.pdf.
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Mayer, Giovano. "Condições de existência de autoexcitação em geradores de indução conforme suas condições operativas." Universidade Estadual do Oeste do Parana, 2012. http://tede.unioeste.br:8080/tede/handle/tede/1088.
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Previous issue date: 2012-12-10The use of alternative sources of energy requires electromechanical conversion equipments that exhibit low installation, operating and maintenance costs. In such way, small energy resources that are not connect to the power system (PS) can be benefited by the use of squirrel-cage induction generators (IG) which show such characteristics. When operating in an isolated mode, the IG is called SEIG - Self Excited Induction Generator, and in this configuration its self excitation is promoted through the connection of appropriate capacitors to the terminals of the machine stator. The existence of self-excitation in the IG depends on the value of the capacitor connected to the stator, the mechanical velocity and the load. This work aims to study the conditions of existence of self-excitation in induction generators having in mind applications in isolated generators systems. Towards this goal, initially the conditions for the existence of self-excitation are stated in terms of appropriate parameters, units and quantities, so as to highlight its relations with the operative characteristics of the machine. It is considered that the induction generator is connected to a load that contains both reactive and active components, parameterized in terms of its rated power. The self-excitation capacitors are represented by its reactive power, called self-excitation reactive power (PRAE). Self-excitation existence regions are defined which explicitate conditions for the existence and maintenance of self-excitation over, a region of operating conditions (OR) of the generator. Through the analysis of the existence of the self-excitation over the OR and the parameterization of the PRAE and the load in terms or rated power, procedures for SEIG design are established. With these procedures, the design of the SEIG is defined by the maximum load power, the worse load power factor condition, and the minimum self-excitation speed of the generator. The process of self-excitation of the generator and the design procedures are analyzed with the aid of dynamic simulations of the SEIG complete model, including the non linear model of the magnetizing inductance representing the magnetic saturation. A laboratorial bench was developed to allow studies with asynchronous generation, in particular with the SEIG. The parameters of the generator were identified experimentally and used all along the work, especially in the dynamic simulations showed. The results were also compared with experimental data collected from self-excitation tests performed with the developed laboratory bench.
A utilização de fontes alternativas de energia requer equipamentos de conversão eletromecânica que apresentem baixos custos de implantação, operação e manutenção. Desta forma, pequenos recursos energéticos não ligados ao sistema elétrico de potência (SEP) podem ser beneficiados pelo emprego do gerador de indução (GI) com rotor em gaiola, que apresenta tais características. Quando operado de forma isolada, o GI é denominado de SEIG Self Excited Induction Generator, e nesta configuração sua autoexcitação é promovida através do acoplamento de capacitores apropriados aos terminais do estator da máquina. A existência da autoexcitação no GI depende do valor do capacitor conectado ao estator, da velocidade mecânica e da carga. Este trabalho tem por objetivo estudar as condições de existência da autoexcitação em geradores de indução visando sua aplicação em sistemas isolados de geração. Neste sentido, inicialmente as condições de existência de autoexcitação são colocadas em termos de parâmetros, unidades e grandezas apropriadas, a fim de explicitar as relações com as características operativas da máquina. Também é considerado que o gerador de indução é acoplado a uma carga que contém componentes tanto ativos quanto reativos parametrizados em termos de potência. Os capacitores de autoexcitação são representados por sua potência reativa denominada de potência reativa de autoexcitação (PRAE). São definidas regiões de existência de autoexcitação explicitando condições para a existência e a manutenção da autoexcitação em torno de regiões operativas (RO) do gerador. Através da análise da existência da autoexcitação em torno da RO e da representação da PRAE e da carga em termos de potência, são estabelecidos procedimentos de projeto do SEIG. Com estes procedimentos, o dimensionamento do SEIG fica em função da carga máxima a ser acionada, da pior condição de fator de potência da mesma e da velocidade mínima de autoexcitação do gerador. O processo de autoexcitação do gerador e os procedimentos de projeto são analisados com o auxílio de simulações dinâmicas do modelo completo do SEIG, incluindo o modelo não linear da indutância de magnetização representando a saturação magnética. Uma bancada laboratorial foi desenvolvida para possibilitar estudos com geração assíncrona, em particular com o SEIG. Os parâmetros do gerador foram levantados experimentalmente e utilizados em todo o trabalho, inclusive nas simulações dinâmicas apresentadas. Os resultados foram confrontados também com dados experimentais de testes de autoexcitação obtidos com a bancada desenvolvida.
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Herrera, Victoria Alejandra Salazar. "Diagnóstico de falhas e determinação de eficiência em sistemas geradores isolados baseados em gerador de indução auto-excitado." reponame:Repositório Institucional da UFABC, 2016.
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9
"CONSTANT VOLTAGE, CONSTANT FREQUENCY OPERATION OF A SELF-EXCITED INDUCTION GENERATOR." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606678/index.pdf.
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10
Cheng, Kuang-Hsiung, and 鄭光雄. "Analyses of Three-Phase Self-Excited Induction Generator under unbalanced load conditions." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/b85w3y.
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碩士崑山科技大學
電機工程研究所
92
This thesis analyses the steady-state and dynamic characteristics of a three-phase self excited induction generator (SEIG) under static loading conditions. This thesis employs eigenvalue and eigenvalue sensitivity to determine minimum values of excitation capacitance of the studied induction generator under different operating conditions. Since the examined induction generator is under either balanced or unbalanced three-phase conditions, five different operating modes, i.e., three phase load perturbation, three phase short circuit and fault clearing, line-to-line short circuit, single phase capacitor opening and load rejection, single-line opening at capacitor bank, are respectively investigated, the three-phase induction machine model based on q-d-0 variables in a stationary reference frame is employed. Finally, experimental results obtained from a laboratory 1-hp induction machine set is compared with the simulated results to validate the effectiveness and feasibility of the proposed schemes.
11
Guo, Chun-Ning, and 郭郡寧. "Simulation, Analytical Modeling and Measurement of an Self-Excited Three-Phase Induction Generator." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/89879069802933991184.
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碩士國立雲林科技大學
電機工程系碩士班
92
In this thesis, based on the theory of symmetrical components method and two-port network method, the positive-sequence equivalent circuit and the negative-sequence equivalent circuit of an induction machine are connected together as an equivalent circuit model for steady-state analysis of a self-excited three-phase induction generator operating under unbalanced loading impedances. The Universal Machine Model of the Electromagnetic Transients Program (EMTP) is also utilized to simulate the performance of self-excited condition of the induction generator. Finally, experimental results carried out using a 375W induction machine confirm the feasibility and validity of the theoretical modeling and EMTP simulation.
12
Cheng, Chang-Min, and 鄭健閔. "Analysis of a Three-Phase Isolated Self-Excited Induction Generator Feeding a Single-Phase Load." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/81043427425363658840.
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碩士國立成功大學
電機工程學系
87
This thesis analyzes the steady-state and dynamic characteristics of a three-phase isolated self-excited induction generator supplying a static single-phase load. The eigenvalue sensitivity scheme is employed to find the critical value of the studied machine under different operating conditions. Since the research area in this thesis focuses on the unbalanced loading characteristics, the three-phase induction machine model is utilized to derive mathematical equations of the studied machine. The obtained dynamic simulated results is employed to examine the steady-state characteristics of the studied machine. Finally, experimental results obtained from a laboratory 1.1kW induction machine confirm the feasibility and effectiveness of the proposed method.
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Lee, Ming-Hsueh, and 李明學. "Balanced Operation of a Three-phase Self-excited Induction Generator Supplying a Single-phase Load." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32699396242487093819.
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博士國立雲林科技大學
工程科技研究所博士班
101
When a three-phase induction generator (IG) supplies unbalanced loads, its terminal voltages and line currents are also unbalanced, which may cause the IG to overheat and need to be derated. A single-phase loaded self-excited induction generator (SEIG) works under most unfavorable load unbalance conditions. This thesis proposes a three-capacitor circuit scheme and a method to find the values of the self-excitation capacitors that allow the SEIG to be balanced. The SEIG is modeled by a two-port network equivalent circuit that resolves the SEIG into its positive- and negative-sequence circuits associated with the self-excitation capacitors and the load. Successful results for balancing the SEIG supplying a single-phase load have been achieved by properly choosing the values of the excitation capacitors. With the aid of EMTP /ATP-Draw, the dynamic characteristic of the SEIG supplying a single-phase load is simulated the calculated and simulated results are in good agreement with each other. Finally, experimental results carried out using a 0.5 hp SEIG confirm the feasibility and validity of the theoretical modeling and EMTP /ATP-Draw simulation.
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Sheen, Jinn-Chyuan, and 沈進泉. "Voltage Regulation of an Isolated Self-excited Induction Generator by using Solid-state Synchronous Condenser." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/21389358019100102231.
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Wolfson, Deborah R. "Analysis and control of a self excited induction generator in a wind driven irrigation pump." 1990. http://catalog.hathitrust.org/api/volumes/oclc/23042812.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1990.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 109-111).
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Seyoum, Dawit. "The dynamic analysis and control of a self-excited induction generator driven by a wind turbine /." 2003. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20051017.181909/index.html.
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LIU, SHIH-YU, and 劉時宇. "Development of a Model for the Three-Phase Self-Excited Induction Generator under the ATP Environment." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/24g63h.
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碩士國立雲林科技大學
電機工程系
105
This thesis presents a model of the three-phase self-excited induction generator (SEIG) for the Alternative Transients Program (ATP). The operational characteristics of the three-phase SEIG's model is analyzed under balanced and unbalanced loading conditions. First, this study introduces the six-parameter single-phase equivalent circuit of SEIG, and uses the nodal admittance method to analyze the generator's steady-state performance under balanced loading conditions. The results will be extended to a SEIG model supplying unbalanced loads. The SEIG's simulation will be carried out in the ATP. The small voltage operation range of the SEIG allows the ATP SEIG model to be improved so that the ATP simulation results agree better with those obtained from the analytical model and from experimentally measured values. Finally, the voltage and current unbalance factors under unbalanced loading conditions are analyzed by the two-port network model, the experiments, and the ATP model for comparisons.
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Chen, He-wen, and 陳和文. "Implementation of a Controlled Inverter for an Autonomous Self-Excited Induction Generator Feeding an Isolated Load." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/2k5w28.
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碩士國立成功大學
電機工程學系碩博士班
90
This thesis presents the results of design, implementation, and simulation of an autonomous self-excited induction generator (SEIG) feeding an isolated load through the employment of power converters (rectifier and inverter). The DC-to-AC inverter employs pulse-width-modulated (PWM) technique and a TMS320F240 digital signal processor (DSP) to convert variable-voltage and variable-frequency voltage generated from the SEIG to a three-phase constant-voltage and constant frequency voltage source. The three-phase induction machine model based on an a-b-c reference frame is employed to simulate the performance of the SEIG connected to the power converters and loads. An experimental prototype with a 2.2 kW induction machine driven by a brushless DC machine (BLDC) is to demonstrate the performance of the proposed control scheme. Both simulated and experimental results of the studied system under different values of loading resistance and rotor speed are accomplished and compared in detail. It can be concluded from the simulated and experimental results that the proposed power converters with adequate control scheme can effectively improve the performance of output voltage of the studied SEIG under various rotor speeds and loading conditions.
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Dastagir, Ghulam. "Voltage and frequency regulation of a stand-alone self-excited induction generator with an unregulated prime mover." Thesis, 2008. http://spectrum.library.concordia.ca/975637/1/MR40878.pdf.
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The squirrel-cage induction machine is very attractive for small and medium power generation schemes because of its low cost, robustness and high power density (W/kg). However, the magnitude and the frequency of the generated voltage depend upon the rotor speed, the amount of capacitive excitation, and the load in stand-alone systems with unregulated prime movers. A common approach for providing regulated voltage and frequency to the load is the use of an asynchronous link (ac-dc-ac) power electronic converter. The main disadvantage of this scheme is that the two series connected ac-dc converters have to be rated at least to the rated generator output power. This thesis investigates the use of a single reduced rating ac-dc converter, or voltage source inverter (VSI), connected to the stator of a self-excited induction generator (SEIG) for regulating purposes. Reactive power control is used to regulate the voltage magnitude while active power control, made possible by using a battery bank at the dc side of the VSI, regulates the voltage frequency. An experimental set-up is implemented for the proposed scheme operating with unregulated micro hydro and wind turbines, implemented on a prime mover emulator. The experimental results are in agreement with the simulation results, theoretical analysis and design specifications
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Maguire, Trevor Lorne. "Apparatus for asynchronously linking a variable-speed self-excited induction generator to an isolated ac electrical load." 1992. http://hdl.handle.net/1993/18517.
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Tang, Jong-Heng, and 唐仲亨. "Analysis and Simulation of the Characteristics of a Three-phase Self-excited Induction Generator with Unbalanced Loads." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/52069245087849950237.
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碩士國立雲林科技大學
電機工程系碩士班
94
This thesis compares two analytical methods, i.e., the two-port network method and the loop impedance method, for analyzing the characteristics of a self-excited induction generator supplying unbalanced loads. The two methods have been found to give the same results. However, not only does the former give better physical interpretation than the later, but it is also computationally more efficient. This is followed by a simulation study using the EMTP, and an experimental study using a 375-W induction machine, to validate the results obtained from the analytical methods. In comparison with the simulation and the experimental studies, the analytical methods give satisfactory results in most situations.
22
Ma, Yu-Ren, and 馬玉壬. "Finite Element Modeling of a Permanent Magnet DC Motor and a Self-excited Three-Phase Induction Generator." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/16966065303989745820.
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碩士國立雲林科技大學
電機工程系碩士班
94
This thesis is divided into two parts, the permanent magnet dc motor, and the self-excited induction generator. A permanent dc motor uses permanent magnet as its poles. Since it has no excitation windings in its poles, the magnetic flux cannot be controlled. When the reluctance of the magnetic circuit is too high, the magnetic flux in the poles will be significantly reduced, resulting in a too low voltage and a too high current in the armature. This is followed by an increase in the temperature of the machine body, causing a demagnetization effect of the permanent magnet and finally damage of the motor. In this thesis, a 420 W, 24 V permanent magnet DC motor is analyzed using the finite element method to improve its design of the magnetic circuit. In the second part related to the induction generator, the finite element method is also utilized to simulate the performance of self-excited condition of induction generator, which verifies the feasibility of the isolated self-excited induction generator simulated by finite element.
23
CHEN, JHIH-YU, and 陳致宇. "Digital and Analytical Modeling of a Three-Phase Self-Excited Induction Generator Supplying AC/DC/AC Inverters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/5y7j59.
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Maguire, Trevor Lorne. "Preliminary investigations of a system comprising a self-excited induction generator asynchronously coupled through a D.C. link to an isolated A.C. load." 1986. http://hdl.handle.net/1993/15407.
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李景輝. "A novel analysis of self-excited induction generators." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/56861423442445288948.
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Li, Liang-Te, and 李亮德. "The Characteristic Analysis and Simulation of Three Phase Self-Excited Induction Generators." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/51288609463882939913.
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碩士國立高雄應用科技大學
電機工程系碩士班
92
The induction generator plays the most important role in the wind energy generation system. The shunt capacitors are added to provide reactive power for its self-excited generation. Wind is not consistently stable and the operation of the isolated self-excited induction generator are influenced significantly by the wind availability and load changes. As the system is going to parallel operation with the utility, it may cause the severe stability problems. This thesis mainly proposes the simulation and analysis of the steady state and transient characteristics for the self-excited induction generators including the case of isolated operation without loads, with the unbalanced capacitors, with the different loads, and under the unbalanced fault conditions. The further study and simulations of the dynamic behavior of induction generators connected to power grid network are also included.
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CHEN, BO-REN, and 陳柏任. "A Study on Parallel Operation of Three-phase Self-excited Induction Generators." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ba2hwa.
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碩士國立雲林科技大學
電機工程系
106
This thesis deals with the steady-state analysis of parallel operation of three-phase self-excited induction generators (SEIGs) supplying balanced and unbalanced loads. After rewriting the single-node admittance method as a two-node admittance method, the author applies the two-node admittance method to the case of two SEIGs in parallel supplying balanced load. When the SEIGs supply an unbalanced load, the two-port network method is first used to establish an analytical model for a single generator, then extended to the case of two induction generators connected in parallel. Finally, the proposed method is verified by measuring the steady-state characteristics of three-phase SEIGs with the same capacity and different capacities running in parallel under various operating conditions.
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kuo, sung-chun, and 郭松村. "Performance Analyses of Isolated Self-Excited Induction Generators under Various Loading Conditions." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/51883611688776373845.
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Lee, Jun-De, and 李俊德. "Design of Three-Phase Boost Circuits and a Controllable Inverter for Self-excited Induction Generators." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/03152742467945758126.
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碩士國立成功大學
電機工程學系碩博士班
96
The aim of this thesis is to develop a control strategy for power-factor-correction converters and a controllable DC-to-AC inverter for a self-excited induction generator whose both output voltage and frequency are inherently affected by random wind speed and connected loads. The proposed power converters are properly controlled using an IC UC 3854 and a digital signal controller dsPIC30F4011. Three single-phase power-factor-correction converters are connected to the self-excited induction generator to control the DC-link voltage and correct the output power factor of the self-excited induction generator. Single-phase inverter is employed to produce fixed AC voltage and frequency for the connected single-phase AC loads. The studied system is simulated by PSIM and the simulated results are validated by experimental tests. The results show that the stable output voltage can be maintained when the speed of the studied self-excited induction generator is varied from 1300 rpm to 1600 rpm.
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DAI, WEI-ZHI, and 戴維志. "Analysis and Simulation of the Characteristics of Parallel Operation of Three-phase Self-excited Induction Generators." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/vag4t5.
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碩士國立雲林科技大學
電機工程系
107
This thesis deals with analysis and simulation of parallel operation of three-phase self-excited induction generators (SEIGs). Analysis of the equivalent circuit model of parallel three-phase SEIGs is based on the extension of a single induction generator. The simulation considers the nonlinearity of the three-phase SEIG magnetizing characteristics by piecewise linearization. After the parameters and the magnetization curves of the induction motors have been measured, they are used for steady-state analysis and simulation on the Alternative Transients Program (ATP). When the two SEIGs can both build-up voltage and current, we analyze how the load power is distributed and study their characteristics under various conditions. Finally, the results of the analytical circuit model and the ATP simulation are verified by experiments.
31
Lee, Dong-Jing, and 李東璟. "Coordination Control between Controllable Converter and Switched Excitation Capacitors of Autonomous Self-excited Induction Generators Using DSP." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/30463158976169156635.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
92
The aim of this thesis is to develop a coordination control between controllable converter and switched excitation capacitors for autonomous wind self-excited induction generators because both output voltage and frequency of an autonomous wind induction generator would be inherently affected by random wind speed and connected loads. In this thesis, the generated AC power source of the studied wind induction generator is converted to a weal regulated DC power source by means of switching power transistors using a digital signal processor (DSP). The controlled DC power source is employed to supply dc loads and inverter which is for producing fixed AC power source. A laboratory 2.2 kW induction generator driven by a brushless DC motor and a TMS320F240 DSP are practically utilized. Three-phase induction- generator model, three-phase controllable converter model, switched excitation-capacitor model are integrated to form complete system dynamic equations for the purpose of obtaining detailed simulations. It can be concluded from the simulated and experimental results that the proposed wind energy conversion system can be practically applied to the studied wind induction generators under various operating conditions.