Due to the continuous growth in the number of grid-tied electronic power converters, it has become important to study how they can be represented from the point of view of the grid itself and the system-level problems that can arise once connected. This thesis uses linear analysis to obtain a mathematical model capable of representing the impedance of a three-phase Voltage Source Converter (VSC) expressed in a rotating d-q frame. For this reason, the Small-Signal average model of the converter under analysis will be considered to analyze its behavior when it works by injecting power into the grid or when it is uses as a rectifier, absorbing energy from the grid.