This paper presents the controller design and tests over a DC-AC converter used in an isolated photovoltaic (PV) system. The control stage is on a Boost converter and its effect takes place on a Voltage Source Inverter (VSI), to reach the DC-AC conversion essential in the PV system by a cascade connection of them. The digital controller was verified through tests in the simulation software Proteus®, obtaining satisfactory results related to the stability of the output voltage and a harmonic distortion lower than 6%, which indicates it is a viable control conversion system for a future real implementation in a PV installation.