The proportional–integral controller is adopted as the inner loop controller to control the grid
currentILf,whereinKP andKI are 0.08 and 625, respectively.
Another proportional–integral controller is used in the outer
Fig. 13. Photograph of the experimental prototype. (a) PV-DCBM prototype.
(b) Centralized inverter prototype.
TABLE I I
PARAMETERS OF THEEXPERIMENTALPROTOTYPE
loop to keep the dc bus voltage Vb constant, whereinKbP and
KbI are 0.175 and 0.68, respectively.