Browsing by Author "Islam, K.K."

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Determination of Module Rearrangement Techniques for Non-uniformly Aged PV Arrays with SP, TCT, BL and HC Configurations for Maximum Power Output
(Institute of Electrical and Electronics Engineers Inc., 2019-04-01) Mansur, A.A.,; Amin, M.R.,; Islam, K.K.
The power production of a PV array decreases due to some specific factors such as temperature, shading, soiling, non-uniform aging of PV modules etc. The nonuniform aging of PV modules in an array is a significant factor of power degradation. This increases current-voltage (1- V) mismatch among the array modules and causes power loss. There are different techniques of module rearrangements in an array to reduce mismatch power loss (MML) and thus increase the array output power. This paper investigates experimentally both the voltage based and current based module rearrangement techniques on a 4× 6 aged PV array with series-parallel (SP), total-cross-tied (TCT), bridge-linked (BL) and honey-comb (HC) configurations. The results are compared with the conventional technique of randomly module arrangement in an array. The experimental results show that both current and voltage based module rearrangement techniques are performed better than randomly module arrangement technique with respect to output power for each SP, TCT, BL and HC configurations. Another comparison illustrates that the maximum output power is generated by HC configuration while the minimum is obtained by SP configuration.
Performance comparison of mismatch power loss minimization techniques in series-parallel PV array configurations
(MDPI AG, 2019) Mansur, A.A.,; Ruhul Amin, Md.,; Islam, K.K.
The mismatch in current-voltage (I-V) characteristics of photovoltaic (PV) modules causes significant power loss in a large PV array, which is known as mismatch power loss (MML). The PV array output power generation can be improved by minimizing MML using different techniques. This paper investigates the performance of different module arrangement techniques to minimize MML both for long series string (LSS) and long parallel branch (LPB) in series-parallel (SP) array configurations at uniform irradiance condition. To investigate the significance of MML LSS-SP configuration with dimensions: 1 × 40, 2 × 20, 4 × 10, 5 × 8 and LPB-SP configuration with dimensions: 40 × 1, 20 × 2, 10 × 4, 8 × 5 were used. A comparative analysis is made to find the effectiveness of MML reduction techniques on PV arrays with three different power ratings. Simulation results show that the PV modules arrangement obtained by the genetic algorithm (GA) and current based arrangement (Im) performed better than the arrangements obtained by all other techniques in terms of PV array output power and MML minimization. The performance of the proposed technique was analyzed for both LSS-SP and LPB-SP array configurations in 400 W, 3400 W, and 9880 W arrays. To substantiate the simulation results experiment was performed using a 400 W PV array in outdoor weather condition and obtained similar results. It was also observed that the percentage of recoverable energy (%RE) obtained by arranging the modules using the GA method was higher than Im based method for both LSS-SP and LPB-SP array configurations. A maximum %RE of 4.159 % was recorded for a 5 × 8 LSS-SP array configuration by applying the GA based MML reduction method.