Conversor CC-CA bidirecional monofásico tipo T de cinco níveis

Abstract

This dissertation presents the analysis and implementation of a five level T-type single-phase CC-CA bidirectional converter, with the main goal of connecting it to the electric grid. Static and dynamic analyses are demonstrated, as well as, the stresses on each component of the structure. A design methodology is indicated, seeking the practical implementation of the topology, with a rated power of 2500 VA and 220 𝑉𝑅𝑀𝑆. All expressions developed through the mathematical analysis of the converter are validated by numerical simulations, proving the veracity of the presented equations. Positive aspects of the converter are observed, when a comparison with the H bridge converter is performed. Thus, resulting in a better efficiency. The main positive aspects found in the studied converter are: a) reduced losses in the inductor of the low pass filter; the switching in all the switches occurs with half the dc-link voltage; with a total of six semiconductors, two commutes at low frequency and four changes between dissipative and non-dissipative switching. b) with the five-level modulation, a better quality of the generated signal is verified, reducing harmonic distortions and electromagnetic interference. Therefore, in the end, these characteristics are proved by means of a practical implementation. Simulation and experimental results are presented with the purpose of validating the whole study developed in this work.