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A new methodology for the assessing of power losses in partially shaded SPV arrays

Author

Listed:
  • de Jesus dos Santos Rodrigues, Marinaldo
  • Torres, Pedro Ferreira
  • Barros Galhardo, Marcos André
  • Chase, Otavio Andre
  • Monteiro, Weslley Leão
  • de Arimatéia Alves Vieira Filho, José
  • Mares, Fabrício Menezes
  • Macêdo, Wilson Negrão

Abstract

This paper describes a novel methodology for estimating the shading factor and the irradiance in partially shaded photovoltaic arrays. The results indicate that the monitoring of short circuit currents obtained from the IV curves of shaded and unshaded modules can be used to calculate the overall irradiance on partially shaded and not shaded photovoltaic arrays. This new methodology avoids the need to use several irradiance sensors to map the shaded and unshaded regions. Besides that, this paper presents a simple mathematical model to estimate shading losses on SPV arrays at the points of maximum global and local power. The methodology can be described in five steps: the measurement of the IV curve and cell temperature, pre-processing of the IV curve, calculation of the shading factor and irradiance on the shaded and unshaded areas, use of the photovoltaic array model to obtain the simulated IV curve and the shading level distribution in the array. The proposed model was developed using the methodology presented in this work, demonstrating how useful it can be to validate and develop models applied to evaluate the shading effects. Calculated losses are compared to those obtained with models found in the literature. The proposed model is useful for calculating the instantaneous power losses, requiring less information as input than other detailed models, and requiring low computational effort.

Suggested Citation

  • de Jesus dos Santos Rodrigues, Marinaldo & Torres, Pedro Ferreira & Barros Galhardo, Marcos André & Chase, Otavio Andre & Monteiro, Weslley Leão & de Arimatéia Alves Vieira Filho, José & Mares, Fabríc, 2021. "A new methodology for the assessing of power losses in partially shaded SPV arrays," Energy, Elsevier, vol. 232(C).
  • Handle: RePEc:eee:energy:v:232:y:2021:i:c:s0360544221011865
    DOI: 10.1016/j.energy.2021.120938
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    References listed on IDEAS

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    1. Satpathy, Priya Ranjan & Sharma, Renu & Jena, Sasmita, 2017. "A shade dispersion interconnection scheme for partially shaded modules in a solar PV array network," Energy, Elsevier, vol. 139(C), pages 350-365.
    2. Ahmad Rivai & Nasrudin Abd Rahim & Mohamad Fathi Mohamad Elias & Jafferi Jamaludin, 2019. "Analysis of Photovoltaic String Failure and Health Monitoring with Module Fault Identification," Energies, MDPI, vol. 13(1), pages 1-16, December.
    3. Satpathy, Priya Ranjan & Jena, Sasmita & Sharma, Renu, 2018. "Power enhancement from partially shaded modules of solar PV arrays through various interconnections among modules," Energy, Elsevier, vol. 144(C), pages 839-850.
    4. Drif, M. & Pérez, P.J. & Aguilera, J. & Aguilar, J.D., 2008. "A new estimation method of irradiance on a partially shaded PV generator in grid-connected photovoltaic systems," Renewable Energy, Elsevier, vol. 33(9), pages 2048-2056.
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