Published Paper Details:

In recent times, there has been a notable surge in the adoption of single-phase transformer less grid-connected Photovoltaic (PV) systems. This trend can be attributed to their reduced physical dimensions and volume, which in turn contribute to an augmented operational efficiency. The present study focuses on the successful implementation of a single-phase, two-stage grid-connected PV system, both under Standard Test Conditions (STC) and during load variations. The initial stage of this system incorporates the utilization of DC-DC converters based on Maximum Power Point Tracking (MPPT) control. The MPPT algorithm employed encompasses the Perturb and Observe as well as the incremental conductance (INC) methods, which are harnessed to attain the utmost power output from the photovoltaic module. Moving to the subsequent stage, a DC-AC inverter is employed in conjunction with an LCL filter and a Phase Locked Loop (PLL). These components synergistically facilitate synchronization with the grid. An investigation has been conducted on a grid-connected solar power generation system of modest scale, boasting a maximum power output capacity of 2kW. The purpose of this analysis is to delve into the intricacies of its functioning. Through meticulous simulations, the outcomes substantiate the superior efficacy of the Incremental Conductance (INC) algorithm in terms of maximum power point tracking within the context of a grid-connected network, as compared to the traditional INC algorithm. Furthermore, the accomplishment of seamless grid current synchronization with grid voltage has been achieved, both during standard test conditions and varying load scenarios. These successful synchronization endeavours highlight the robustness of the system's design and its ability to adapt to different operational contexts. The cumulative findings collectively showcase the system's performance in a manner that is indeed satisfactory, instilling confidence in its capabilities and potential for practical application.