Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-25T14:57:44Z No. of bitstreams: 1 thainansantostheodoro.pdf: 6277443 bytes, checksum: 64fdae570574b42d13c86c42cedaca9e (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-04-25T15:29:25Z (GMT) No. of bitstreams: 1 thainansantostheodoro.pdf: 6277443 bytes, checksum: 64fdae570574b42d13c86c42cedaca9e (MD5) / Made available in DSpace on 2017-04-25T15:29:25Z (GMT). No. of bitstreams: 1 thainansantostheodoro.pdf: 6277443 bytes, checksum: 64fdae570574b42d13c86c42cedaca9e (MD5) Previous issue date: 2016-09-05 / Esta dissertação apresenta uma técnica de simulação híbrida no domínio do tempo de programas de transitórios eletromecânicos e eletromagnéticos usando o MatLab/ Simulink, a qual confere eficiência computacional e precisão, tanto na análise de sistemas de potência, quanto de controle, sobretudo em situações nas quais fenômenos eletromagnéticos e eletromecânicos se sobrepõe, como é o caso da integração de grandes parques eólicos. Para que ocorra a interação entre os dois programas é necessário a adequação das grandezas de fasores para formas de onda e vice versa, assim, é apresentada uma nova abordagem de extração de fasores instantâneos a partir do DSOGI com boa eficiência computacional com perda desprezível de informações. A comunicação regular entre os programas é feita através do protocolo de comunicação baseado na plataforma TCP/IP, que possibilita a representação de modelos distribuídos e a divisão do esforço computacional. São apresentados resultados de simulação para a integração de um parque eólico, representado por um aerogerador DFIG, à uma rede de 29 barras e 7 geradores. Todo o sistema foi representado em um programa de transitórios eletromagnéticos para comparação com os resultados do programa híbrido. Os resultados se mostraram encorajadores já que houve diminuição de quase 70% do tempo de processamento. / This dissertation presents a hybrid simulation technique in the time domain of electromechanical and electromagnetic transient programs using the MatLab/Simulink, which confers computational efficiency and precision, in both power system and control analysis, mainly in situations where electromagnetic and electromechanical phenomena overlap, such as the integration of large wind farms. In order to guarantee the interaction between the two programs it is necessary to adapt the phasor magnitudes to waveforms and vice versa, thus, a new approach is presented for the extraction of instantaneous phasors using the DSOGI approach, with good computational efficiency and negligible loss of information. The regular communication between the programs is done through the communication protocol based on the TCP/IP platform, which allows the representation of distributed models and enables the division of computational effortt between computers. Simulation results are presented for the integration of a wind farm, represented by a DFIG, to a network of 29 bars and 7 generators. The entire system was represented in an electromagnetic transient program for comparison with the results of the hybrid program. The results were encouraging since there was a decrease of almost 70 % of the processing time.

The aim of this project was to devise an algorithm for three phase AC power grid measurements that could be utilized in an excitation system for controlling generators. This application requires fast and accurate measurements even when the voltages in the power grid are characterized by unbalanced three-phase, frequency variations and harmonic distortions. Phase locked loop algorithms are used in grid synchronization techniques and are developed to withstand disturbances in the power grid. A DSOGI-PLL was implemented on a PLC and then evaluated. The DSOGI-PLL was tested with input voltages generated by a relay testing system. The result showed that the DSOGI-PLL could measure positive sequence component RMS and grid frequency of unbalanced three-phase voltages and voltages characterized by frequency variations and harmonic distortions. However, the measurements response time and accuracy did not meet the requirements for application in excitation systems.