Decoupled current source vector control of a 3-phase grid-connected inverter using a novel vector utility observer for synchronization

The analysis of a novel algorithm based vector utility observer for inverter-grid synchronization is carried out, whereas the decoupled regulation of the instantaneous active and reactive power is achieved by using the Park vector transformation. The effect of the grid harmonics is considered, both in time domain and in transform domain. The digital signal processor based algorithm is implemented in the current source vector control of a simulated 3-phase grid-connected inverter, guaranteeing a unitary power factor if it is desired. Several simulations show the performance of the utility observer proposed, as well as the control of the 3-phase grid-connected inverter.