In this paper, a modified PSO algorithm is proposed to track the MPP
for the single-stage utility-scale grid connected for PV system. The
PSO-based MPPT discussed in the previous works are applied for
two-stage PV system or single-stage system with dc–dc converter,
where the duty ratios are considered to be the PSO particles. Here,
the PV voltages are selected as PSO agents and the voltage
reference to dc-link controller is decided by computational results
of the PSO MPPT controller to track the MPP in all partial shaded
conditions, where the conventional HC and INC methods fail.
Various simulation results demonstrate that the proposed method
reduces the tracking time (within 0.6 s), and oscillations at MPP
are almost zero. The proposed method is suitable in even those
cases, where other methods based on classical algorithms used for
partial shaded conditions do not work properly. From the test
results, it is found that the proposed modified PSO method is more
accurate and efficient compared with the existing methods.
Moreover, the proposed method is simple and fast