Improved Optimization Strategy for Irradiance Equalization in Dynamic Photovoltaic Arrays

Storey, Jonathan; Wilson, Peter; Bagnall, Darren M.

doi:10.1109/tpel.2012.2221481

Cited by 144 publications

(85 citation statements)

References 27 publications

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“…The total number of possible arrangements of the PV modules is , which is a huge number when or is big. For example, when p=5, s=10, this number equals 29 …”

Section: B General Non-uniform Aging Casesmentioning

confidence: 99%

“…Firstly, let us sort the maximum short-circuit currents for PV strings from largest to smallest, as in Table V. For α=1, the maximum power is given by V module *(0.9+0.9+0.8+0.9+0.9) pu =4.4 V module (pu) (29) For α=2, the maximum power is V module *2*(0.9+0.9+0.8+0.8+0.9) pu =8.6 V module (pu) (30) Similarly, for α=3,4,…,10, the maximum powers are calculated as: 12.3 V module (pu), 15.6 V module (pu), 19.5 V module (pu), 22.8 V module (pu), 25.9 V module (pu), 26.4 V module (pu), 24.3 V module (pu), 20 V module (pu). Therefore, the maximum power output is 26.4 pu V module when there are 7 PV modules in each PV string generating electricity.…”

Section: A Simulationmentioning

confidence: 99%

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Efficiency Improvement of Nonuniformly Aged PV Arrays

Zhang

et al. 2017

IEEE Trans. Power Electron.

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Abstract-The utilization of solar energy by photovoltaic (PV) systems have received much research and development (R&D) attention across the globe. In the past decades, a large number of PV array have been installed. Since the installed PV arrays often operate in harsh environments, non-uniform aging can occur and impact adversely on the performance of PV systems, especially in the middle and late periods of their service life. Due to the high cost of replacing aged PV modules by new modules, it is appealing to improve energy efficiency of aged PV systems. For this purpose, this paper presents a PV module reconfiguration strategy to achieve the maximum power generation from non-uniformly aged PV arrays without significant investment. The proposed reconfiguration strategy is based on the cell-unit structure of PV modules, the operating voltage limit of gird-connected converter, and the resulted bucket-effect of the maximum short circuit current. The objectives are to analyze all the potential reorganization options of the PV modules, find the maximum power point and express it in a proposition. This proposition is further developed into a novel implementable algorithm to calculate the maximum power generation and the corresponding reconfiguration of the PV modules. The immediate benefits from this reconfiguration are the increased total power output and maximum power point voltage information for global maximum power point tracking (MPPT). A PV array simulation model is used to illustrate the proposed method under three different cases. Furthermore, an experimental rig is built to verify the effectiveness of the proposed method. The proposed method will open an effective approach for condition-based maintenance of emerging aging PV arrays. Index Terms-Maximum power tracking, non-uniform aging,Manuscript received May 13, 2015; revised October 11, 2015 and January 31, 2016; accepted August 24, 2015. Copyright © 2010 IEEE. Personal use of this material is permitted. However, permission to use this material for any other purposes must be obtained from the IEEE by sending a request to pubs-permissions@ieee.org.Y I. INTRODUCTIONSolar energy utilization has received much attention across the globe over the last decades [1]- [6]. Currently, photovoltaic (PV) power devices are gaining in popularity in the global renewable energy market, primarily owing to the reducing manufacture costs of PV panels and continuous improvement in power conversion technologies [7]- [8]. In practice, high energy conversion efficiency and long effective service time can help reducing capital and operating costs and thus are highly desired.With the improvement of materials technologies, monocrystalline silicon and multicrystalline silicon now can be economically produced in large quantities. However, their energy conversion efficiency from solar to electricity is still low. Typical efficiency for monocrystalline silicon solar cells is around 20% while it is 18% for multicrystalline silicon solar cells [9]. On the power electronics side, hig...

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“…The total number of possible arrangements of the PV modules is , which is a huge number when or is big. For example, when p=5, s=10, this number equals 29 …”

Section: B General Non-uniform Aging Casesmentioning

confidence: 99%

Section: A Simulationmentioning

confidence: 99%

Efficiency Improvement of Nonuniformly Aged PV Arrays

Zhang

et al. 2017

IEEE Trans. Power Electron.

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“…The simulations have considered the three shading patterns shown in Fig.6 are approximations for the most common partial shading patterns in PV fields [29][30]. These patterns happen when the front-row arrays are shading the bottom of the back-row arrays, causing the overall array to be partially shaded.…”

Section: A Determination the Current-voltage Model Of Photovoltaic Mmentioning

confidence: 99%

Modeling and simulation of photovoltaic array with different interconnection configurations under partial shading conditions for fill factor evaluation

Hamdi

Saigaa

Drif

2014

2014 International Renewable and Sustainable Energy Conference (IRSEC)

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Partial shading of a photovoltaic array is the condition under which different modules in the array experience different irradiance levels due to shading. This difference causes mismatch between the modules, leading to undesirable effects such as reduction in generating power and hot spots. The severity of these effects can be reduced by changing module interconnections of a solar array, three different interconnections configurations, series-parallel (SP), bridge-linked (BL) and total-cross-tied (TCT) of photovoltaic generator are studied using simulation models to compare their performances, also studied their characteristic parameter variation in the function of shading, with a special attention to:Open circuit voltage (Voc), Short circuit (lsc), Maximum power (Pmp) and fill factor (FF) evaluation, in order to find which configuration is less influential to partial shading effect.

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“…Thus, the shadows on PV arrays are important factors that decrease the operational efficiency of MPPT algorithms. MPPT algorithms with which the system performance in PV arrays is tracked and reconfiguration approaches are presented in the literature as algorithms that main at detecting and increasing system performance [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A shadow detection approach based on fuzzy logic using images obtained from PV array

Karaköse

Firildak

2015

2015 6th International Conference on Modeling, Simulation, and Applied Optimization (ICMSAO)

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Shadows on PV arrays influence the energy production performance negatively. There are many methods in the literature related to the detection of these shadows and reconfiguration of arrays. The methods proposed in the literature generally aim at reconfiguration of arrays and detecting shadow regions by using current (I), voltage (V) and power (P) information. In the process of reconfiguration it is quite difficult to measure to use P, V, I information. In this paper, in order to use in the reconfiguration processes for the detection of the shadow region on PV arrays, a new fuzzy logic based computer vision method is presented. The proposed method, firstly, performs object detection with background subtraction. Then, detects the edge of the object regions. Finally, it detects shadow regions with the help of fuzzy logic decision making system. Experimental results are provides effective performance for detecting of shaded areas on PV arrays.

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Improved Optimization Strategy for Irradiance Equalization in Dynamic Photovoltaic Arrays

Cited by 144 publications

References 27 publications

Efficiency Improvement of Nonuniformly Aged PV Arrays

Efficiency Improvement of Nonuniformly Aged PV Arrays

Modeling and simulation of photovoltaic array with different interconnection configurations under partial shading conditions for fill factor evaluation

A shadow detection approach based on fuzzy logic using images obtained from PV array

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