A photovoltaic multi-functional converter with multi-resonant controller coefficients improved by a genetic algorithm

The present work deals with the simulation of a photovoltaic distributed generation system at the micro generation level, using a DC-AC power converter responsible for injecting active power into the grid and acting as a shunt active power filter, mitigating the harmonics of local nonlinear loads. For this, the system has a reference current generator that employs an algorithm based on the synchronous reference frame. The current reference has a distorted portion, corresponding to the distortion power of the nonlinear load added to the active portion to be injected to the grid. A PI plus multi-resonant controller are inserted to reproduce correctly the current reference. In order to enhance stability and waveform quality a genetic algorithm is adopted to find the best gains for the controllers. Simulations throught MatLab/Simulink® are presented to confirm the feasibility of the proposal.