Target Voltage Iterations Based Global Flexible Power Point Tracking Algorithm Under Partial Shading Photovoltaic Systems

Global flexible power point tracking (GFPPT) is proposed to realize the flexible power point tracking (FPPT) of photovoltaic systems under partial shading conditions (PSC). Because the working process of GFPPT is similar to global power point tracking (GMPPT), the performance of GFPPT can be improved by applying the existing advanced GMPPT algorithm. However, the improvement of GFPPT is limited while applying the existing advanced GMPPT algorithm directly. So, a target-voltage-iterations (TVI) based GFPPT algorithm is proposed in this article to further increase the performance of GFPPT during PSC. Compared with the advanced GFPPT algorithms, the proposed TVI-based GFPPT algorithm shows the advantages of fast-tracking speed and little energy difference during the tracking by skipping the voltage section without the reference power. Followed by theoretical analysis, the simulation and experimental evaluation validate the claimed advantages of the proposed TVI-based GFPPT algorithm.