Bypass diode characteristic effect on the behavior of solar PV array at shadow condition

Ziar, Hesan; Mansourpour, S.; Afjei, E.; Kazemi, Mohammad Ghasem

doi:10.1109/pedstc.2012.6183331

Cited by 47 publications

(20 citation statements)

References 6 publications

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“…At present, the detection of bypass diode failure in PV systems became one of main interests, due to the importance of the bypass diodes in PV modules. As well-known that bypass diodes are parallelized with PV modules, consequently, target to limit the maximum reverse current of PV modules affected by partial shading conditions [15] and [16]. Hence, the use of bypass diodes in PV modules allows continue supplying power during partial shading scenarios.…”

Section: Introductionmentioning

confidence: 99%

Novel Open-Circuit Photovoltaic Bypass Diode Fault Detection Algorithm

Dhimish

Chen

2019

IEEE J. Photovoltaics

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In this paper, a novel photovoltaic (PV) bypass diode fault detection algorithm is presented. The algorithm consists of three main steps. First, the threshold voltage of the I-V curve is obtained using different failure bypass diode scenarios. Second, the theoretical prediction for the faulty regions of bypass diodes is calculated using the analysis of voltage drop in the I-V curve as well as the voltage at maximum power point. Lastly, the actual I-V curve under any environmental condition is measured and compared with theoretical predictions. The proposed algorithm has been experimentally evaluated using a PV string that comprises three series-connected PV modules, and subtotal nine bypass diodes. Various experiments have been conducted under diverse bypass diodes failure conditions. The achieved detection accuracy is always greater than 99.39% and 99.74% under slow and fast solar irradiance transition respectively.

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Section: Introductionmentioning

confidence: 99%

Novel Open-Circuit Photovoltaic Bypass Diode Fault Detection Algorithm

Dhimish

Chen

2019

IEEE J. Photovoltaics

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“…The said current mismatch between substrings can be brought about by a variety of failures related to degradation, overheating, manufacturing defects, or nonuniform soiling . A comprehensive study has also been dedicated to the decrease in PV performance due to partial shading . Of this partial list of failure modes, system's power loss due to partial shading has the closest conceptual relevance to our study, as the current mismatch that is caused by the shading together with the incorporation of bypass diodes manifests itself in the formation of steps across the module I‐V curve.…”

Section: Introductionmentioning

confidence: 99%

The view‐factor effect shaping ofI‐Vcharacteristics

Peled

Appelbaum

2017

Progress in Photovoltaics

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The diffuse radiation collected by PV modules is coupled with a view-factor of the module to sky, which varies across the module surface in multiple-row installations. The view-factor variation inflicts current mismatch between the module strings by virtue of the nonuniform solar flux absorbed by the module's cells, leading in turn to an overall reduction in performance. The following study establishes a theoretical framework for predicting the step-wise properties of the module I-V curve following the current mismatch induced by the view-factor. To illustrate the steps pattern, synthetic I-V curves are derived by using the 5-parameter PV cell single-diode model in conjunction with 3 additional parameters that account for the cell's avalanche breakdown.We investigate the steps pattern as well as the power losses incurred by the view-factor by simulating different types of PV deployments over a range diffuse radiation rates. For a tilted module installed on a horizontal plane, for instance, the study predicts a reduction in power ranging 2.8% to 25%, depending on the precentage diffuse radiation on the site in question. KEYWORDS current mismatch, diffuse irradiation, I-V curve steps, view-factor to sky

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“…Moreover, higher working temperatures also accelerate the degradation of the ribbon and solder bonds and the PID effect [10], as well as cause cell cracks and failures of junction boxes and bypass diodes. Many long-term studies made on field-aged PV generators have shown that, despite the presence of bypass diodes, localized heating phenomena represent one of the main causes of PV module failures [11][12][13]. On the basis of the above considerations, it is evident that it is advisable to limit as much as possible the operating temperature of PV modules.…”

Section: Introductionmentioning

confidence: 99%

On the Link between the Operating Point and the Temperature Distribution in PV Arrays Working under Mismatching Conditions

Costanzo

Vitelli

2018

International Journal of Photoenergy

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Mismatching operating conditions negatively affect the extracted energy in photovoltaic (PV) systems. They may also lead to dangerous localized heating phenomena (hot spots) that can cause, in turn, accelerated ageing and reduced reliability. Since the adoption of bypass diodes or smart active switches does not prevent the occurrence of hotspots, it is necessary to investigate alternative strategies. A promising solution is represented by the proper regulation of the operating point of the PV cells in the current vs. voltage (I-V) or power vs. voltage (P-V) planes when mismatching conditions occur. In particular, in this paper, the existence of operating points allowing a suitable compromise between maximization of the extracted power and minimization of thermal stresses, due to hot spots, is experimentally evidenced. Experimental results highlighting the link existing between the operating point in the I-V plane and the PV cell temperature distribution under uniform and mismatching operating conditions are presented and discussed. On the basis of the obtained experimental results, it is possible to state that, when mismatching conditions occur, it is mandatory to properly choose the operating point: the global maximum power point may not be the best operating point. Hence, it is crucial to gain information about the eventual occurrence of mismatching conditions in order to be able to properly choose the best operating point. Therefore, another crucial aspect that is evidenced in this paper is represented by the fact that the detection of the occurrence of mismatching conditions, based on the analysis of the shape of the I-V and/or P-V characteristics, is effective only if the analysis is carried out for both positive and negative voltages.

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Bypass diode characteristic effect on the behavior of solar PV array at shadow condition

Cited by 47 publications

References 6 publications

Novel Open-Circuit Photovoltaic Bypass Diode Fault Detection Algorithm

Novel Open-Circuit Photovoltaic Bypass Diode Fault Detection Algorithm

The view‐factor effect shaping ofI‐Vcharacteristics

On the Link between the Operating Point and the Temperature Distribution in PV Arrays Working under Mismatching Conditions

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