I. Introduction
The use of three phase power converters has already become common in industry applications and power systems applications, e.g. motor drives, converters for wind turbines, etc. Among all types of converters available, the more common in use is the voltage source converter (VSC). High power converters, otherwise were introduced quite early employing current source converters (CSC) due to the limitations of the power electronic switches available at the beginning (thyristor for instance) [1].