Control of Power Electronic Interface for renewable energy sources under distorted grid voltage

In this paper a Power Electronic Interface (PEI) to integrate up to two renewable energy sources is presented. Through the control of the DC link terminal voltage and the AC terminal voltage of the voltage source converter (VSC) the generation of the different distributed sources can be adapted to the grid, supplying the local load and exporting energy to the grid. The system was analyzed under distorted grid voltage, where the quality of the grid current is affected. Solutions based on the use of resonant passive filters and injection of harmonics to compensate the distortion of the grid voltage is presented.