A Novel Hybrid Approach Based on Analytical and Metaheuristic Algorithms for Parameters and Dynamic Resistance Estimation of a PV Array

Accurate parameters of photovoltaic (PV) arrays are essential for the modeling, analysis, and control of PV systems. Due to the lack of complete datasheets from manufacturers, different techniques have been introduced to extract the unknown parameters of PV modules. A novel approach based on one of...

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Veröffentlicht in:	IEEE transactions on power systems Jg. 38; H. 6; S. 1 - 15
Hauptverfasser:	Magableh, Mohammad Adnan K., Radwan, Amr, Mohamed, Yasser Abdel-Rady I.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York IEEE 01.11.2023 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Algorithms Analytical methods Analytical models Arrays Comparative studies Computational modeling Heuristic methods Mathematical models metaheuristic optimization Optimization Parameters Performance assessment photovoltaic (PV) parameters identification Photovoltaic cells PV dynamic resistance PV system stability Resistance Solar power generation Stability analysis State-of-the-art reviews Thermal stability
ISSN:	0885-8950, 1558-0679
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Abstract	Accurate parameters of photovoltaic (PV) arrays are essential for the modeling, analysis, and control of PV systems. Due to the lack of complete datasheets from manufacturers, different techniques have been introduced to extract the unknown parameters of PV modules. A novel approach based on one of the most recent metaheuristic (MH) optimization algorithms, the Flow Direction Algorithm, is developed in this paper to estimate the PV-modules parameters accurately. The proposed approach extracts the parameters for single-, double-, and three-diode models under different operating conditions. Comparative studies with state-of-the-art MH algorithms showed that the proposed approach is more accurate and robust and reduces the computational burden. Furthermore, a general formula is derived to obtain the dynamic resistance of different PV models. It is shown in this paper that inaccurate PV model parameters might negatively impact the steady-state and dynamic performance assessment of grid-connected PV systems under different operating conditions. Detailed time-domain simulations are presented to validate the analytical results and show the effectiveness of the proposed approach.
AbstractList	Accurate parameters of photovoltaic (PV) arrays are essential for the modeling, analysis, and control of PV systems. Due to the lack of complete datasheets from manufacturers, different techniques have been introduced to extract the unknown parameters of PV modules. A novel approach based on one of the most recent metaheuristic (MH) optimization algorithms, the Flow Direction Algorithm, is developed in this paper to estimate the PV-modules parameters accurately. The proposed approach extracts the parameters for single-, double-, and three-diode models under different operating conditions. Comparative studies with state-of-the-art MH algorithms showed that the proposed approach is more accurate and robust and reduces the computational burden. Furthermore, a general formula is derived to obtain the dynamic resistance of different PV models. It is shown in this paper that inaccurate PV model parameters might negatively impact the steady-state and dynamic performance assessment of grid-connected PV systems under different operating conditions. Detailed time-domain simulations are presented to validate the analytical results and show the effectiveness of the proposed approach.
Author	Mohamed, Yasser Abdel-Rady I. Radwan, Amr Magableh, Mohammad Adnan K.
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References_xml	– ident: ref1 doi: 10.1109/TSTE.2019.2917513 – year: 2008 ident: ref62 publication-title: Solar Module TD-MF5-Series Datasheet – volume: 54 start-page: 1593 year: 1988 ident: ref54 article-title: Extracting topographic structure from digital elevation data for geographic information system analysis publication-title: Photogrammetric Eng Remote Sens – ident: ref42 doi: 10.1016/j.enconman.2018.08.053 – ident: ref10 doi: 10.1109/TPEL.2013.2255068 – ident: ref59 doi: 10.1109/TIE.2016.2615590 – ident: ref34 doi: 10.1109/ACCESS.2021.3069748 – ident: ref57 doi: 10.1109/TEC.2011.2159268 – ident: ref15 doi: 10.1016/j.rser.2016.03.049 – ident: ref41 doi: 10.1016/j.enconman.2016.06.052 – ident: ref20 doi: 10.1109/TSTE.2015.2503435 – ident: ref22 doi: 10.1109/JPHOTOV.2019.2896264 – ident: ref44 doi: 10.3390/en13020497 – ident: ref36 doi: 10.1016/j.enconman.2020.113388 – ident: ref12 doi: 10.1109/ACCESS.2021.3052153 – ident: ref19 doi: 10.1109/TIE.2012.2230606 – ident: ref51 doi: 10.1109/ICSEngT.2013.6650144 – ident: ref61 doi: 10.1109/TIE.2018.2793216 – ident: ref28 doi: 10.1109/TIE.2017.2682023 – ident: ref47 doi: 10.1109/ACCESS.2021.3061529 – ident: ref24 doi: 10.1109/41.20347 – ident: ref23 doi: 10.1109/JESTPE.2020.3016635 – ident: ref40 doi: 10.1016/j.enconman.2017.08.088 – ident: ref11 doi: 10.1109/TPEL.2009.2013862 – ident: ref26 doi: 10.1109/TIE.2015.2390193 – ident: ref30 doi: 10.1016/j.rser.2021.110828 – ident: ref52 doi: 10.1109/TSTE.2017.2736060 – ident: ref27 doi: 10.1109/JPHOTOV.2016.2617038 – ident: ref4 doi: 10.1109/TIA.2020.3020931 – ident: ref5 doi: 10.1109/TPWRS.2022.3148983 – ident: ref6 doi: 10.1109/ACCESS.2020.3007710 – ident: ref7 doi: 10.3390/en14020508 – ident: ref38 doi: 10.1016/j.enconman.2020.113820 – ident: ref29 doi: 10.1109/ACCESS.2021.3056407 – ident: ref33 doi: 10.1109/ACCESS.2020.3024975 – ident: ref55 doi: 10.1016/S0734-189X(84)80011-0 – ident: ref45 doi: 10.1109/ACCESS.2020.3019244 – ident: ref35 doi: 10.1109/ACCESS.2020.2984728 – ident: ref25 doi: 10.1109/TIE.2014.2317138 – ident: ref16 doi: 10.1002/2050-7038.13113 – ident: ref60 doi: 10.1109/TSTE.2016.2620941 – ident: ref32 doi: 10.1016/j.solener.2010.02.012 – ident: ref58 doi: 10.1109/TIE.2015.2498139 – ident: ref50 doi: 10.1016/j.solener.2019.01.025 – ident: ref39 doi: 10.1016/j.enconman.2019.112243 – ident: ref53 doi: 10.1080/03052150008941301 – ident: ref14 doi: 10.1109/TIE.2015.2420617 – volume: 154 year: 2020 ident: ref43 article-title: Extraction of uncertain parameters of single and double diode model of a photovoltaic panel using Salp Swarm algorithm publication-title: Meas J Int Meas Confed – ident: ref21 doi: 10.1109/TED.2021.3099088 – ident: ref49 doi: 10.1016/j.cie.2021.107224 – ident: ref48 doi: 10.1155/2016/2143572 – ident: ref13 doi: 10.1109/ACCESS.2020.3046536 – ident: ref46 doi: 10.1016/j.cma.2020.113609 – ident: ref31 doi: 10.1109/4235.585893 – volume: 34 start-page: 286 year: 1987 ident: ref17 article-title: analytical methods for the extraction of solar-cell single- and double-diode model parameters from i-v characteristics publication-title: IEEE Transactions on Electron Devices doi: 10.1109/T-ED.1987.22920 – ident: ref56 doi: 10.1109/ChiCC.2014.6896450 – ident: ref8 doi: 10.1016/j.ijepes.2021.107155 – ident: ref18 doi: 10.1109/TSTE.2011.2170776 – ident: ref9 doi: 10.1109/TPEL.2012.2209899 – ident: ref3 doi: 10.1109/ACCESS.2021.3071056 – ident: ref37 doi: 10.1109/TPEL.2012.2188818 – year: 2021 ident: ref2 article-title: Renewable capacity statistics
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SubjectTerms	Algorithms Analytical methods Analytical models Arrays Comparative studies Computational modeling Heuristic methods Mathematical models metaheuristic optimization Optimization Parameters Performance assessment photovoltaic (PV) parameters identification Photovoltaic cells PV dynamic resistance PV system stability Resistance Solar power generation Stability analysis State-of-the-art reviews Thermal stability
Title	A Novel Hybrid Approach Based on Analytical and Metaheuristic Algorithms for Parameters and Dynamic Resistance Estimation of a PV Array
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