Дисертації з теми "Generator parameter estimation"
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Junior, Edson Luis Geraldi. "Parameter estimation for a three-phase distributed synchronous generator model using noisy measurements." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-19102018-143704/.
Повний текст джерелаOs modelos simplificados de geradores síncronos, amplamente utilizados em estudos de estabilidade de grandes sistemas elétricos de potência, não são completamente adequados para a análise de estabilidade e projetos de controladores dos geradores síncronos distribuídos, geralmente conectados a sistemas tipicamente desequilibrados. Para que os sistemas com geração distribuída possam ser analisados mais fidedignamente, é necessária a utilização de um modelo de gerador síncrono que considere a variação de frequência em suas equações elétricas. Além disso, esse modelo também deve ser capaz de representar possíveis tensões trifásicas desequilibradas nos terminais do gerador. Entretanto, para que esse modelo mais detalhado possa fornecer respostas coerentes com a realidade, deve-se conhecer seus parâmetros. Dessa forma, este trabalho avalia a influência dos parâmetros nas respostas de um modelo de gerador síncrono mais detalhado, adequado para representar operações desbalanceadas, e propõe uma abordagem para a estimação de seus parâmetros mais importantes. Nessa estrutura, inicialmente empregam-se as Funções de Sensibilidade de Trajetória para avaliar a dependência das respostas desse modelo em relação aos seus parâmetros e, a partir disso, ordená-los conforme sua importância. Em seguida, aplica-se um processo de estimação que utiliza o Filtro de Kalman Unscented com o auxílio de um algoritmo genético para estimar os principais parâmetros desse modelo de gerador síncrono em condições de desbalanço. Para a obtenção dos resultados e consequente avaliação da abordagem de estimação proposta, utiliza-se um sistema composto por um gerador síncrono conectado a uma carga trifásica desbalanceada. Além da operação desbalanceada desse sistema teste, também são considerados ruídos devidos ao constante chaveamento de cargas, típicos de sistemas de distribuição. As estimações realizadas para três condições de operação do gerador foram bem satisfatórias, indicando a eficiência da abordagem proposta na obtenção de modelos adequados para descrever a operação de geradores síncronos em condições de desbalanço.
Hasan, S. M. Nayeem. "Hybrid Electric Vehicle Powertrain: On-line Parameter Estimation of an Induction Motor Drive and Torque Control of a A PM BLDC Starter-generator." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1208185834.
Повний текст джерелаCari, Elmer Pablo Tito. "Metodologia de estimação de parâmetros de sistemas dinâmicos não-lineares com aplicação em geradores síncronos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-06052009-101122/.
Повний текст джерелаThis research proposes a new methodology to estimate parameters of synchronous generators based on trajectory sensitivity analysis. This new methodology was created to overcome convergence difficulties presented by the traditional trajectory sensitivity methodology due to: (i) low robustness with relation to initial parameter values and noisy measurements; and (ii) singularities in the algebraic equation of the model of differential-algebraic equations (DAEs) that lead to the nonexistence of solutions, especially when the parameters are far from of the true values. Although the methodology has been developed to solve the synchronous generator problem, it is general and can be used for many types of nonlinear dynamic systems. Therefore, the main contribution of this thesis is the proposal of a new methodology based on trajectory sensitivity to estimate parameters of nonlinear dynamic systems with constraints, i.e., systems modeled by DAEs. More precisely, the equality constraint of the dynamic system is relaxed by an alternative formulation based on the minimization of the algebraic function of the model of DAEs. A second contribution of the thesis is related to the model of the generator. For this intention, the selection of the state variables, inputs and outputs is fundamental for the success of the parameter estimation methodology. In this thesis, this selection allows the generators mechanical and electrical parameters be estimated independently. In order to estimate the electrical parameters, the generator is modeled by a set of convenient DAEs to fulfill the following practical requirements: (i) estimation of the generator parameters from the disturbance measurements obtained with the machine in operation; (ii) use of easily accessible measurements; and (iii) independence of the network parameter. As a final result, an algorithm which combines the new methodology of trajectory sensitivity to constrained systems with the two-stage estimation algorithm is proposed to estimate the generator parameters. This proposed methodology is robust for parameters initial values and fulfills the practical requirements above mentioned. In addition, the estimation of the power angle is a byproduct of the proposed methodology.
Salman, S. "Parameter estimation of synchronous generators on isolated systems." Thesis, University of Aberdeen, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.593388.
Повний текст джерелаHao, Shangyou. "Frequency and time domain parameter estimation of synchronous generators /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487596807821502.
Повний текст джерелаGalbraith, A. S. G. "Estimation of Synchronous Generator Parameters using Time-domain Responses." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1663.
Повний текст джерелаPower system stability simulations are of growing importance for studying the operational integrity of modern power systems, especially in developing economies where generating and transmission capacity lead the demand by relatively small margins. The relevant model topologies, i.e. for synchronous generators, automatic voltage regulators (AVR) and governor control systems, and the simulation software tools are well established. The MATLAB® Power System Blockset provides engineers with a versatile power system stability simulation environment, particularly where the focus is on individual units or small systems. In comparison with dedicated power system simulation tools such as DIgSILENT®, the MATLAB® environment features a superior set of advanced data processing and data analysis features. This includes features such as optimisation and parameter estimation functions. The main aim of this project is to make use of the MATLAB® package in a bid to test an alternative platform with which to estimate the synchronous machine parameters. Conditioning of field data can delay the process considerably, thus the secondary task of this thesis is to solve this issue by ensuring that only one platform is needed for the entire process starting in the field and ending in the modelling and parameter estimation environment within MATLAB®. In closing, the following points summarise the essential aims of this project: • An application using MATLAB® Script must be created that is responsible for importing and processing the data, so it is suitable for analysis purposes. The processing could include cropping, scaling and filtering of data. • Once the data has been imported it must be used with appropriate models to estimate for machine parameters. This will require the use of the Power Systems Blockset. The actual estimation process also requires the creation of an effective cost function, thus a number of different scenarios will have to be investigated before a solution can be found.
Zadeh, Ramin Agha. "Performance control of distributed generation using digital estimation of signal parameters." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/47011/1/Ramin_Agha_Zadeh_Thesis.pdf.
Повний текст джерелаTsai, Hong. "Modeling and parameter estimation of synchronous generators using on-line operating data and standstill measurements /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487846885780036.
Повний текст джерелаRajaraman, Srinivasan. "Robust model-based fault diagnosis for chemical process systems." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3956.
Повний текст джерелаGrymin, David J. "Two-Step System Identification and Primitive-Based Motion Planning for Control of Small Unmanned Aerial Vehicles." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/24520.
Повний текст джерелаPh. D.
Landgraf, Taylon Gomes. "Modelagem e estimação de parâmetros de geradores síncronos via análise de sensibilidade de trajetória." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-17122014-083827/.
Повний текст джерелаIn this work, we investigate an algorithm for estimating parameters of synchronous generators based on trajectories sensitivity analysis. The parameters are estimated by solving a nonlinear optimization problem of least squares. Measurements are compared with the solutions obtained from the dynamic model of the generator and the algorithm seeks to minimize the difference between the measurements and the output of the mathematical model. Measurements were obtained artificially by means of simulations, assuming not only the transient dynamics of the machine, but also considering the subtransient dynamics. The proposed algorithm is suitable for accessible measurements in the field and allows the estimation of parameters from measurements of system disturbances, without the necessity of disconnecting the machine from the system. The main contribution of this work is to propose a new generator model to estimate the parameters of the synchronous generator. To this end, a simplified model is proposed. This model is a modification of the two-axis model of the generator, which uses the generator field current as an input of the model. This model consists of a set of differential-algebraic equations (DAEs) containing an algebraic equation of balance of current. This equation eliminates the need of measuring variables that are difficult to access. The proposed algorithm has been tested with data obtained from dynamic simulations conducted from a test system with satisfactory results. The results has been analysed against the results of the two-axis model using the generator field voltage as an input of the model. These results indicate the possibility of application in real machines.
Huang, Renke. "Seamless design of energy management systems." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53518.
Повний текст джерелаFarfan-Ramos, Luis. "Real-time Fault Diagnosis of Automotive Electrical Power Generation and Storage System." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1303129393.
Повний текст джерелаDai, Min. "Control of power converters for distributed generation applications." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1124329850.
Повний текст джерелаChalla, Kiran Kumar. "Algorithms and Testbed for Synchronous Generator Parameter Estimation." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5884.
Повний текст джерелаMHRD, Govt. of India for the financial support through scholarship and DST, Govt. of India for supporting through the Fund for Improvement of Science and Technology (FIST) program and Robert Bosch Center for Cyber-Physical Systems (RBCCPS), IISc for the financial research grant
Fang, Qing. "Parameter estimation and identiability study of wind turbine generator models." Thesis, 2016. http://hdl.handle.net/2440/103760.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2016.
Dai, Zhen. "Generic Wind Turbine Generator Model Comparison Based on Optimal Parameter Fitting." Thesis, 2014. http://hdl.handle.net/1807/44013.
Повний текст джерелаDai, Wei-Fu, and 戴維富. "On-Line Parameter Estimation and Position Sensorless Control of the Permanent-Magnet Synchronous Generator." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/03058252167921831341.
Повний текст джерела國立中正大學
電機工程研究所
102
This thesis implements the on-line parameter estimation to improve the position sensorless control of permanent-magnet synchronous generator(PMSG). First, the system configuration including the current control algorithm, position sensorless scheme, on-line parameter estimation and hardware circuit design is introduced. The modeling and parameter estimation are performed for the design of current control and position sensorless control schemes. The derivations of the division-summation(D-Σ) current control and extended-EMF based position sensorless control are accomplished. The position estimation and current control are implemented by the microcontroller. In the on-line parameter estimation, the forgetting factor is first chosen. The q-axis and d-axis models are compared, and the estimating accuracy is verified. Finally, the estimated parameter is implemented in the position sensorless control to improve the rotor position error.
Lian, Bo-Han, and 連柏翰. "Improvement of the Position Sensorless Control for the Permanent-Magnet Synchronous Generator Applying On-Line Parameter Estimation." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/67423065263764173381.
Повний текст джерела國立中正大學
電機工程研究所
103
The on-line parameter estimation is implemented in this thesis to improve the position sensorless control of permanent-magnet synchronous generator (PMSG). First, the system configuration including the current control algorithm, position sensorless scheme, on-line parameter estimation and hardware circuit design is introduced. The modeling and parameter estimation are performed for the design of current control and position sensorless control schemes. The derivations of the division-summation (D-Σ) current control and extended-EMF based position sensorless control are accomplished. The position estimation and current control are implemented by the microcontroller. In the on-line parameter estimation, the forgetting factor is first chosen. The q-axis and d-axis models are compared, and the estimating accuracy is verified. Finally, the estimated parameter is implemented in the position sensorless control to improve the rotor position error. Keywords:permanent-magnet synchronous generator, position sensorless scheme, on-line parameter estimation.
Beirão, Fábio Duarte. "Netodyssey: a framework for real-time windowed analysis of network traffic." Master's thesis, 2010. http://hdl.handle.net/10400.6/3718.
Повний текст джерелаFundação para a Ciência e a Tecnologia (FCT)
Tate, Peter Anthony Dorsey John G. "Part I: Isocratic and gradient elution reversed-phase liquid chromatography for the estimation of the hydrophobicity parameter log K'W applications to newer generation stationary phases. Part II: Planar electrochromatographic instrumental design and results /." Diss., 2005. http://etd.lib.fsu.edu/theses/available/etd-04122005-182202.
Повний текст джерелаAdvisor: Dr. John G. Dorsey, Florida State University, College of Arts and Sciences, Dept. of Chemistry and Biochemistry. Title and description from dissertation home page (June 15, 2005). Document formatted into pages; contains xiv, 112 pages. Includes bibliographical references.