Stability and Total Harmonic Distortion Analysis with Performance of Grid-Tied PV Systems

The stability and Total Harmonic Distortion (THD) of the grid integration photovoltaic (PV) array was discussed and analyzed in this article using two separate maximum power point (MPPT) tracking algorithms. A PV array access to the grid by means of a VSI and a boost converter were applied in this work. The structures in the PSCAD environment were simulated, including MPPT methodologies for Incremental Conductivity (InC) and Perturbation & Observation (P&O). Software package is used in both normal and temporary environments to evaluate grid disorders. The results indicate that the InC MPPT procedure provides excellent response in normal condition than those of the P&O MPPT control system. That being said, in both temporary conditions the P&O MPPT algorithm offers more recovery time than the InC MPPT algorithm. The entire model postulates the architecture of a hybrid MPPT algorithm in such a way that it operates efficiently under both temporary and normal conditions. Power converter and inverter use both PWM and SPWM switching methodologies during this whole approach. Finally, an analysis of the overall THD of the PCC output current of the inverter is being used, compared with the limits of the THD values obtained by regulatory standards such as IEEE Std 519-1992.