This study is about the usage of the Petri Net as an analysis and development tool of the automation of a pilot micro plant of 130 kW. The project was carried out in the energy quality laboratory center at the Escola Politécnica de São Paulo. Its main goal was to study the most important variables related to the quality of energy and the functionalities of the automatized system types. By using the Petri Net, it was possible to foresee the attainment, vivacity, reliability and reversibility of the software, developed and installed in a state-of-the-art programmable logical controller (PLC). Through an open protocol communication network, information was exchanged between the PLC and the generators (G1 and G2) control modules. Digital inputs