Conversores multiníveis aplicados ao bombeio centrífugo submerso.

Abstract

The work presents a study of multilevel converters for application to Eletrical Submersible Pumping (ESP), a method of artificial lift in oil. The multilevel converter topology is utilized in cascade, which uses in H-bridge converters connected in series. This topology has features like high modularity and fault tolerance that well suits the situation of the oil. Initially it will be presented a performance analysis of the modulation strategies applied to this converter as well as a harmonic analysis. Then the study will be directed to the phenomenon of long cables, common in the petroleum industry. A cable model used will be presented and simulated to evaluate the multilevel converter behavior, as well as electing the strategy that best fits the phenomenon. Finally, it will be proposed a technique of Selective Level Elimination (SLE), which increases the efficiency of the system for speeds below the nominal, common situation in raising oil.