Modelagem e controle de conversores modulares multinível via representação Σ − ∆

Abstract

This dissertation is dedicated to a thorough investigation of the Modular Multilevel Converter (MMC) and its applications, with a particular emphasis on its application in high-voltage direct current power transmission. Following an introduction to converters and topics relevant to their study, a comprehensive mathematical model of the MMC was developed using the ∆ − Σ representation. This model has the capability to segregate converter variables based on their harmonic content and incorporates the voltages of internal capacitors in the converter’s submodules. The application of Clarke and Park Transformations in this model emerges as a pivotal aspect, necessitating various mathematical manipulations. The proposed control architecture aims to enhance the converter’s operation and optimize power transmission efficiency. This approach encompasses the control of injected currents into the grid, suppression of circulating currents, regulation of the voltage in the DC bus, control of input current, and management of energy stored internally in the submodules. Following this development, the presented methodology was validated through computational simulations in specialized software, followed by the integration of the studied system into a power transmission line between two alternating current networks for an introductory study.