The Improved vµ LMS-Based Grid Connected Solar PV System Power Flow with Abnormal Grid and Non-linear Load Conditions

In the reported work, the two-stage grid-tied solar PV with non-linear load is presented, with various conditions at the point of common coupling (PCC) voltage. The non-linear load at PCC absorbs the active power and injects the reactive power which may lead to higher THD in grid current. The various PCC voltage profiles like normal voltage and distorted voltage due to harmonics are analyzed and the system is simulated for, 20% SAG and 20% SWELL at PCC to test the robustness and effectiveness of the control for presented VSC control. The improved vµ least mean square (IvµLMS) method is presented for grid-tied VSC control to provide good convergence, less burden, and improved dynamic responses under various conditions at PCC. According to the IEEE-519 standard, the PV power is fed at unity power factor (UPF) with lower total harmonic distortion (THD) for the grid and load. On the DC-side a recent DC–DC boost converter topology with higher voltage gain is used, this makes the smaller PV arrays and able to convert grid-tied system. The perturb and observe (P&O) algorithm is applied to obtain the maximum power point (MPP) operation for solar PV arrays. The grid-tied PV system and its controls are modeled in MATLAB/Simulink environment and analyzed. The grid current is maintained at lower THDs as per IEEE519 and at unity power factor with different working conditions, which verifies the efficacy of the presented method.