Abstract
Partial shading is an unavoidable factor that reduces the performance of solar PV systems. The PV system receives uneven irradiation due to partial shading which causes the mismatch loss. The partial shading distracts the irradiation from the PV modules that makes the healthy modules as idle or low performing modules. The mismatch loss can be mitigated by uniformly distributing the partial shading over the PV array. In this work, L-shaped propagated array configuration method with a new dynamic reconfiguration algorithm have proposed for enhancing the energy conversion under the partial shading conditions. A new kind of array configuration is implemented in a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4\times 4$ </tex-math></inline-formula> PV array for the better shade dispersion. Further, a dynamic reconfiguration algorithm is employed to disperse the effect of partial shading. The combination of new array configuration and reconfiguration method is simulated in MATLAB/Simulink® and implemented in hardware. The outputs are measured under all possible shading patterns and validated with the outputs of convention methods for observing the enhanced energy conversion rate of the proposed system.
Highlights
Photovoltaic (PV) system accelerates its development in the global energy market in recent years because of its ecofriendly characteristics, reliability and renewability [1], [2]
The proposed hybrid reconfiguration method is compared with the existing configurations like (a) Total Cross Tied (TCT), (b) Sudoku puzzle pattern and (c) Futoshiki Puzzle pattern under eight various shading patterns such as (i) uneven column shading (UC), (ii) Uneven Row shading (UR), (iii) Diagonal shading (DS), (iv) Random shading (RS), (v) Short and Narrow shading (SN), (vi) Short and Wide shading (SW), (vii) Long and narrow shading (LN) and (viii) Long and Wide shading (LW)
The five types of array configurations including the proposed method have been analyzed with the eight kinds of possible shading patterns
Summary
Photovoltaic (PV) system accelerates its development in the global energy market in recent years because of its ecofriendly characteristics, reliability and renewability [1], [2]. The partial shading distributes non-uniform irradiation over the PV array which causes the mismatch losses. Many approaches were proposed to obtain the maximum power from the partial shaded PV array. Bypass diode configuration is one of the earlier techniques to suppress the effect of partial shaded cell within it. The internal resistance of the PV cell is increased more than the bypass diode. The global maximum power point (GMPP) is tracked and obtained from the various LMPP by incorporating the MPPT algorithm with the controller. The fractional chaos based flower pollination algorithm is proposed in [12] to enhance the power generation of PV array under varying partial shaded conditions. The TCT, BL, HC, Sudoku, and FPP are dispersing the shading effect over the PV array to change the uneven current generating rows into even current generating row, which increases the power output. The level of partial shading is unpredictable and the effectiveness of array configuration is dumped by the complicated shading patterns
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