Modulação phase disposition com algoritmo de sorting para conversores multiníveis simétricos em cascata

Detalhes bibliográficos
Ano de defesa: 2018
Autor(a) principal: De Paris, Jean Michel
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Santa Maria
Brasil
Engenharia Elétrica
UFSM
Programa de Pós-Graduação em Engenharia Elétrica
Centro de Tecnologia
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://repositorio.ufsm.br/handle/1/16590
Resumo: This master thesis presents a modulation technique with sorting of the command signals of semiconductor devices, applied to symmetric cascaded multilevel converters. This technique, referenced here as Phase Disposition with Sorting (PDS), is based on the Phase Disposition (PD) modulation technique and has reference generation with geometric approach. The converter used in this study presents three cells per phase in configuration Back-to-Back. The algorithm aims to overcome the problem of irregular power distribution among the cascaded multilevel converter cells presented in the use of PD technique, but maintaining the characteristic of lower THD (Total Harmonic Distortion) and WTHD (Weighted Total Harmonic Distortion) indices on the line voltages in relation to Phase-Shifted (PS) modulation. Thus, with this redistribution of pulses over the switches, the algorithm is able to distribute the power among the cells and also allows its operation in the occurrence of faults in the converter. In this context, a bibliographic review is presented to introduce the topic of multilevel converters and the main modulation techniques employed, as well as what has already been done to overcome the problem of power distribution mentioned above. After the proper presentation of the reference generation by geometric approach and the proposed algorithm, simulation results for the converter without fault condition, as well as for fault conditions in different cells and modulation indices, will be presented and discussed. The methodology of control of the DC bus and communication protocol implemented will be presented and, at the end of this thesis, the validation of the proposed technique through the experimental results obtained will be presented.