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Analytical performance monitoring of a 142.5kWp grid-connected rooftop BIPV system in Singapore

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  • Wittkopf, Stephen
  • Valliappan, Selvam
  • Liu, Lingyun
  • Ang, Kian Seng
  • Cheng, Seng Chye Jonathan

Abstract

The first zero-energy office building in Singapore uses building integrated photovoltaics to meet its energy target. The main electricity generator is the 142.5kWp grid-connected BIPV system on the roof of the building. This paper presents the first performance assessment of the BIPV system over 18 months of operation following the guidelines of the IEC standard 61724 for measurement, data exchange and analysis. The performance analysis shows a good overall performance ratio of 0.81. The average array yield is 3.86h/d and – after subtracting the capture and system losses of 0.58h/d and 0.16h/d, respectively – the resulting final yield is 3.12h/d averaged over all arrays. The system and array efficiencies are 11.2% and 11.8%, respectively, compared to the nameplate PV module efficiency of 13.7%. The overall inverter efficiency is 94.8%. All the results are based on irradiance measurements with calibrated pyranometers. In addition, a classification of daily irradiance is presented, dividing the days into overcast, intermediate and clear days with each high, medium and low temporal change of irradiance levels. Results show that the performance ratio is lowest for clear days with high irradiance fluctuations, due to higher capture and system losses. Despite relatively higher losses, the absolute final yields are higher for clear days. Detailed analyses with respect to the impact of shading, orientation/tilt, and PV module temperature are also presented for selected arrays.

Suggested Citation

  • Wittkopf, Stephen & Valliappan, Selvam & Liu, Lingyun & Ang, Kian Seng & Cheng, Seng Chye Jonathan, 2012. "Analytical performance monitoring of a 142.5kWp grid-connected rooftop BIPV system in Singapore," Renewable Energy, Elsevier, vol. 47(C), pages 9-20.
    • Handle: RePEc:eee:renene:v:47:y:2012:i:c:p:9-20
    DOI: 10.1016/j.renene.2012.03.034
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    1. So, Jung Hun & Jung, Young Seok & Yu, Gwon Jong & Choi, Ju Yeop & Choi, Jae Ho, 2007. "Performance results and analysis of 3kW grid-connected PV systems," Renewable Energy, Elsevier, vol. 32(11), pages 1858-1872.
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    2. Lee, Jae Bum & Park, Jae Wan & Yoon, Jong Ho & Baek, Nam Choon & Kim, Dai Kon & Shin, U. Cheul, 2014. "An empirical study of performance characteristics of BIPV (Building Integrated Photovoltaic) system for the realization of zero energy building," Energy, Elsevier, vol. 66(C), pages 25-34.
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    15. Simon Ravyts & Mauricio Dalla Vecchia & Giel Van den Broeck & Johan Driesen, 2019. "Review on Building-Integrated Photovoltaics Electrical System Requirements and Module-Integrated Converter Recommendations," Energies, MDPI, vol. 12(8), pages 1-21, April.
    16. Saber, Esmail M. & Lee, Siew Eang & Manthapuri, Sumanth & Yi, Wang & Deb, Chirag, 2014. "PV (photovoltaics) performance evaluation and simulation-based energy yield prediction for tropical buildings," Energy, Elsevier, vol. 71(C), pages 588-595.
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    18. Edalati, Saeed & Ameri, Mehran & Iranmanesh, Masoud, 2015. "Comparative performance investigation of mono- and poly-crystalline silicon photovoltaic modules for use in grid-connected photovoltaic systems in dry climates," Applied Energy, Elsevier, vol. 160(C), pages 255-265.
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    20. Pillai, Dhanup S. & Shabunko, Veronika & Krishna, Amal, 2022. "A comprehensive review on building integrated photovoltaic systems: Emphasis to technological advancements, outdoor testing, and predictive maintenance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
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    22. Sreenath, S. & Sudhakar, K. & Yusop, A.F., 2020. "Technical assessment of captive solar power plant: A case study of Senai airport, Malaysia," Renewable Energy, Elsevier, vol. 152(C), pages 849-866.

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