Análise da operação e controle de um conversor multinível modular híbrido

Abstract

The study and implementation of multilevel converters, especially Modular Multilevel Converters (MMCs), have increased significantly in the last decades because they have great application in industrial areas, such as High-Voltage Direct Current Transmission Systems (HVDC) and Flexible AC Transmission Systems (FACTS). The latter refers to the application of power electronics equipment with one or more functions in a transmission system to regulate and control parameters such as voltage, impedance, phase angle, power flow, etc. An equipment that can be used in this medium are the static converters operating as a compensator of reactive, controlling the voltage and adjusting the factor of power in the network. Among the static converters, we have the multilevel converters, where we highlight the implementation of hybrid topologies, which are able to synthesize a greater number of voltage levels using the same number of switches, thus causing a decrease in THD Of the output voltage. In this work, the proposal of a Modular Multi-Hybrid Converter is presented, with analysis of the principle of converter operation, modeling and design of the control system of currents and voltages. The proposed converter allows the reduction of output filters, and increase of the voltage levels in relation to the conventional MMC. The simulation results obtained demonstrate a significant gain in the number of levels, allowing the use of low voltage semiconductor locking keys operating at high frequency together with semiconductor switches with high blocking voltage operating at low frequency.