Electric and thermal characteristics of photovoltaic modules under partial shading and with a damaged bypass diode

Ko, Suk Whan; Ju, Young Chul; Hwang, Hye-Mi; So, Jung-Hun; Jung, Youngseok; Song, Hyunjoo; Song, Hee‐eun; Kim, Soo-Hyun; Kang, Gi‐Hwan

doi:10.1016/j.energy.2017.04.030

Cited by 67 publications

(28 citation statements)

References 22 publications

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“…The bypass diode thermal voltage is defined as V t,db = k · (T db /q), where T db is temperature of the bypass diode in Kelvin. In this paper, for the sake of simplicity, it is assumed that the temperature of the cells and the temperature of the bypass diode is the same (i.e., T = T db ), this taking into account that both the submodule and bypass diode temperatures can be considered similar if the PV module does not experiment fast irradiance changes [31].…”

Section: Model Of a Pv Submodulementioning

confidence: 99%

“…The platform is placed in a building roof and it is connected to the electronic load, which in turn is connected to a computer through serial communication, this allowing to obtain the data of the I-V curves. Finally, the experimental tests were carried out in a short time in order to avoid sudden changes in the irradiance level, which allows to consider that both submodule and bypass diode temperatures are the same [31]. The parameters of the three bypass diodes of the module where estimated using the solution introduced in this paper for high, medium and low irradiance levels, which are naturally obtained at different hours of the day and depending on the cloudiness conditions.…”

Section: Experimental Validationmentioning

confidence: 99%

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A Non-Invasive Procedure for Estimating the Exponential Model Parameters of Bypass Diodes in Photovoltaic Modules

et al. 2019

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Bypass diodes (BDs) present in photovoltaic (PV) modules are represented by the exponential model, which requires two parameters: the inverse-saturation current ( I s a t , d b ) and the ideality factor ( η d b ). However, it is difficult to estimate those parameters since the terminals of the BDs are not isolated, hence there is only access to the series connection of the module BDs. This problem must be addressed since inaccurate BDs parameters could produce errors in the reproduction of the current-voltage (I-V) curves of commercial PV modules, which lead to wrong predictions of the power production. This paper proposes a non-invasive procedure to estimate I s a t , d b and η d b of the bypass diodes present in a PV module using two experimental I-V curves. One I-V curve is measured completely covering the submodule of the module whose BD will be parameterized; while the other I-V curve is measured without any shadow on the module. From those curves, the I-V curve of the BD is estimated and I s a t , d b and η d b are calculated by solving a system of two nonlinear equations. The proposed procedure is validated through simulations and experimental results considering a commercial PV module formed by three submodules, where the estimation errors in the reproduction of the BD I-V curve are less than 1% in the simulations and less than 10% in the experiments.

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Section: Model Of a Pv Submodulementioning

confidence: 99%

Section: Experimental Validationmentioning

confidence: 99%

A Non-Invasive Procedure for Estimating the Exponential Model Parameters of Bypass Diodes in Photovoltaic Modules

et al. 2019

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“…In more alarming situation, partial shading may cause permanent damage of PV modules because of hot spot phenomena, which can be dealt using bypass diodes. Thus, it is beneficial to reduce the effects caused by partial shading in a PV system …”

Section: Introductionmentioning

confidence: 99%

“…Several efforts were made by researchers to examine and review the effect of shading on different PV array configurations so as to minimise the mismatch losses and therefore maximise the output power of the PV system under PSCs. Different PV array configurations that have been proposed in the literature are series (S), parallel (P), series parallel (SP), total cross tied (TCT), bridge linked (BL), and honey comb (HC) …”

Section: Introductionmentioning

confidence: 99%

A detailed comparative analysis of different photovoltaic array configurations under partial shading conditions

Jha

Triar

2019

Int Trans Electr Energ Syst

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Summary The objective of this paper is to compare the performances of different photovoltaic (PV) array configurations (series, parallel, series‐parallel, total‐cross‐tied, bridge‐linked, and honey comb) and proposed hybrid configurations (series parallel–total cross tied, bridge linked–total cross tied, honey comb–total cross tied, and bridge linked–honey comb) under artificial and realistic partial shading conditions. The performances of all these configurations have been compared on the basis of their maximum powers, fill factors, thermal voltages, and relative power losses. Different PV array configurations have also been compared on the basis of other significant factors (faults, limitations of specific parameters of the PV system, and cost). The single‐diode model of PV module is considered in this paper for modelling of PV module. The obtained results of different PV array configurations give beneficial knowledge regarding the performances of these configurations for several shading patterns and assist to choose the most satisfactory configuration for a particular shading pattern.

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“…In any case, since the bypass diode is placed at the rear of the panel, the temperature of both the bypass diode and the panel is very near. From the study presented in [21], it is observed that both module and bypass diode temperatures can be considered similar if the PV array does not experiment fast irradiance changes.…”

Section: Experimental Validation Of the Proposed Modelmentioning

confidence: 99%

A Procedure for Modeling Photovoltaic Arrays under Any Configuration and Shading Conditions

et al. 2018

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Photovoltaic (PV) arrays can be connected following regular or irregular connection patterns to form regular configurations (e.g., series-parallel, total cross-tied, bridge-linked, etc.) or irregular configurations, respectively. Several reported works propose models for a single configuration; hence, making the evaluation of arrays with different configuration is a considerable time-consuming task. Moreover, if the PV array adopts an irregular configuration, the classical models cannot be used for its analysis. This paper proposes a modeling procedure for PV arrays connected in any configuration and operating under uniform or partial shading conditions. The procedure divides the array into smaller arrays, named sub-arrays, which can be independently solved. The modeling procedure selects the mesh current solution or the node voltage solution depending on the topology of each sub-array. Therefore, the proposed approach analyzes the PV array using the least number of nonlinear equations. The proposed solution is validated through simulation and experimental results, which demonstrate the proposed model capacity to reproduce the electrical behavior of PV arrays connected in any configuration.

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Electric and thermal characteristics of photovoltaic modules under partial shading and with a damaged bypass diode

Cited by 67 publications

References 22 publications

A Non-Invasive Procedure for Estimating the Exponential Model Parameters of Bypass Diodes in Photovoltaic Modules

A Non-Invasive Procedure for Estimating the Exponential Model Parameters of Bypass Diodes in Photovoltaic Modules

A detailed comparative analysis of different photovoltaic array configurations under partial shading conditions

A Procedure for Modeling Photovoltaic Arrays under Any Configuration and Shading Conditions

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