Abstract
A partial shading condition is a case under which the PV array is exposed to many problems such as losses of the output power of the PV array, and the PV array has more than one maximum power point (MPP), which makes it so difficult to track the MPP. This paper presents the effect of different partial shading patterns on PV array characteristics and the effect on the output power of the PV array, and provides a comparative literature review on methods to mitigate these effects and the drawbacks of these methods. It also proposed a new reconfiguration strategy that increases the output power of the PV array by 13.8 % from the total power under shadow condition, and a new technique for enhancing the output power of the PV array by 20 % of the total power under fully illumining conditions by controlling the switch matrix between the photovoltaic array and adaptive batteries bank. This paper gives a solution for the problem of the difficulty of tracking the MPP, because the proposed strategy makes only one MPP. The simulation was carried out by using MATLAB Simulink under different shading patterns. Citation: Mohamed, A. M., Saafan, S. M., Attalla, A. M., and Elgohary, H. (2018). Reconfiguration technique for Optimization of the Photovoltaic array output power under partial shading conditions. Trends in Renewable Energy, 4, 111-124. DOI: 10.17737/tre.2018.4.2.0068
Highlights
The use of photovoltaic (PV) cells for producing electricity has been recently increased due to reduced costs and increased efficiency of the energy conversion
Some authors discussed a great number of methods to track the global maximum power point (MPP) of the PV array under partial shading conditions
The author concluded that Series-Parallel (SP) interconnection produces the maximum power as compared to Total-Cross-Tied (TCT) interconnection when shadow is portended to be progress on the last row of horizontal modules, while tie connection (TCT) interconnection produces the maximum power as compared to seriesparallel connection (SP) interconnections when shadow is portended to be progress on the left column of vertical modules
Summary
The use of photovoltaic (PV) cells for producing electricity has been recently increased due to reduced costs and increased efficiency of the energy conversion. The effect of partial shading will reduce the output power of the PV array, and the mismatch may be occurring because cells with different characteristic performance are combined together in an array. Some shaded cells consume power from the unshaded cells, and the output power of the PV array reduces and the shaded cells overheat. This phenomenon is called hot spot and it may cause damage of the PV cells. Bypass diodes are commonly used in PV arrays to protect against the effect of partial shading and hotspot power dissipation. The remaining of the paper is organized as the following: Section 2 Literature review, Section 3 Modelling of the PV array, Section 4 Research method, Section 5 Simulation and results, and Section
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