Análise de operação de um conversor multinível modular hibrido

Abstract

This course conclusion work presents a study about a hybrid Modular Multilevel Converter (MMC). To characterize the hybrid topology, distinct modulation strategies and submodule voltages (SMs) are used. Initially, a literature review is carried out about the state of the art of the main topics related to multilevel converters and their respective modulation strategies. With the purpose of explaining the advantages of the proposed hybrid topology, a comparative study is shown in relation to the conventional topologies, in terms of the harmonic content of the output waveform and the commutations number of the semiconductor devices. Through the use of a topology composed of six half-bridges SMs on each arm, the operational stages of the converter are demonstrated and divided according to the switching frequency of the semiconductor devices that are present in the structure of the SMs. Besides that, the control techniques used in the proposed topology are presented in order to ensure the safety of the converter operation. In order to validate the proposed topology, an analysis of the results is carried out, with emphasis on the performance of the control techniques on the capacitor voltages of the submodules and on the inner current of the converter. Finally, the main considerations of the course conclusion paper and some suggestions for future work are presented.