A Comparative Analysis on Different Techniques for Improving the PV System Performance Subjected to Variant Solar Irradiance

Document Type : Original Article

Authors

1 Department of electrical engineering, Minia university, Egypt

2 Electrical Engineering Dept., Faculty of Engineering, Minia University, Egypt

Abstract

The overall power generated by the photovoltaic system is significantly reduced when the modules are not exposed to equal amounts of solar radiation. Three different approaches of boosting power output under the influence of these circumstances were compared in this study. The three approaches were based on different techniques; static, column reconfiguration, and array reconfiguration. The three methodologies were represented by the TCT, CWR, and RTCT methods, respectively. Each of which proved superior to its counterparts using the same methodology. The three methods were tested in two parts. The first part included five different static shading patterns and have been tested on a 5x5 system. RTCT showed superior results compared to the other two methods. It has improved the power output in the all five patterns with rates ranging between 1.45% and 32.49%. While the CWR method achieved improvement in four patterns with lower percentages (between 1.68% and 27.81%), and one pattern was lower than the static TCT. In the second part, the three methods were tested on a system of one hundred modules, arranged in 10x10 array, and under a dynamic solar radiation pattern that changes over time in ten patterns. RTCT provided the highest improvement rate for all cases with 9.5% for the mean of the total period and CWR achieved 6.9%. Therefore direct development of static systems into array reconfiguration using RTCT is recommended if the goal is to obtain the maximum possible power. Simulations were carried out using MATLAB/Simulink, and the characteristic curves were obtained.

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