A noble control scheme for grid connected PV system under unbalanced grid condition

Abstract

In this paper, a noble control scheme of grid connected PV system is presented for injecting balanced current into a unbalanced grid. Current and voltage control scheme is implemented in synchronously rotating reference frame whereas the feed forward term is added in three phase stationary reference frame. The proposed scheme is extensively studied and simulated in MATLAB/Simulink. A 5KVA grid connected solar PV system is developed in the laboratory. The proposed control scheme is implemented in dSPACE 1104 controller board. The hardware results shows that the proposed control scheme can inject balance current even when the grid voltage is unbalanced. THD of the grid current is 2.4%.