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2025 Vol.45, Issue 3 Preview Page

Research Article

Comparative Analysis of the Power Generation Performance of Vertical Bifacial PV Systems Based on Orientation and Albedo

방위 및 알베도에 의한 수직 양면형 PV 시스템의 발전성능 비교·분석

Jiwon Kim1
,
Subin Jeong2
,
Jinhee Kim3
,
Juntae Kim4*
김 지원1
,
정 수빈2
,
김 진희3
,
김 준태4*
1M.S, Student, Department of Architectural Engineering, Kongju National University
2Ph.D. Student, Department of Energy Systems Engineering, Kongju National University
3Research Professor, Green Energy Technology Research Center, Kongju National University
4Professor, Department of Green Smart Architectural Engineering/Department of Energy Systems Engineering (Graduate School), Kongju National University
1국립공주대학교 건축공학과, 석사과정
2국립공주대학교 에너지시스템공학과, 박사과정
3국립공주대학교 그린에너지기술연구소, 연구교수
4국립공주대학교 그린스마트건축공학과/에너지시스템공학과(대학원), 교수
*Corresponding Author
30 June 2025. pp. 39-46
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Abstract

Photovoltaic (PV) systems are typically installed with a tilt angle equal to the latitude of the installation site and oriented toward the south to maximize electrical power generation. However, as the proportion of PV systems installed in the south-facing orientation increases, power generation becomes concentrated in short periods, leading to unstable power system operation. To address this issue, interest in east-west-oriented PV systems has grown, as they distribute peak generation times more evenly than south-facing systems. However, east-west PV systems generate less annual power than south-facing systems with the same capacity. Bifacial PV modules have been used to compensate for this drawback. Bifacial PV systems are influenced by installation conditions, such as ground reflectance (albedo) and azimuth, which should be considered during system design. In this study, the variation in power generation owing to changes in azimuth and albedo was quantitatively analyzed through PVsyst simulations for a vertical bifacial PV system. The simulation results indicated that under the lowest albedo condition of 0.2, the annual cumulative power generation of the east-west PV system was approximately 2.27% lower than that of the north-south PV system. However, peak power generation was effectively distributed between 10:00 AM and 2:00 PM. Additionally, when the albedo increased from 0.2 to 0.8, the annual cumulative power generation of the east-west and west-east PV systems increased by up to 78%, surpassing that of the north-south PV system by approximately 0.3%.

Keywords
Vertical PV system
Bifacial PV system
Power Generation
Simulation
Albedo
키워드
수직형 PV 시스템
양면형 PV 모듈
발전량
시뮬레이션
표면반사율
References
1

Lee, S. M., Lee, E. C., Lee, J. H., Yu, S. H., Heo, J. S., Lee, W. Y., and Kim, B. S., Analysis of the Output Characteristics of a Vertical Photovoltaic System Based on Operational Data: A Case Study in Republic of Korea, Energies, VOl. 16, No. 19, 6971, 2023, https://doi.org/10.3390/en16196971.

10.3390/en16196971
2

Park, D. H., Kim, M. S., So, W. S., Oh, S. Y., Park, H. W., Jang, S. H., Park, S. H., and Kim, W. K., Evaluation of Bifacial Si Solar Module with Different Albedo Conditions, Current Photovoltaic Research, Vol. 6, No. 2, pp. 62-67, 2018, https://doi.org/10.21218/CPR.2018.6.2.062.

3

Eidiani, M., Zeynal, H., Ghavami, A., and Zakaria, Z., Comparative Analysis of Mono-Facial and Bifacial Photovoltaic Modules for Practical Grid-Connected Solar Power Plant Using PVsyst, IEEE International Conference on Power and Energy, pp. 499-504, December 2022, Kedah, Malaysia, https://doi.org/10.1109/PECon54459.2022.9988872.

10.1109/PECon54459.2022.9988872
4

Shahverdian, M. H., Sayyaadi, H., and Sohani, A., An Optical-based Comparative Study to Detect Best Configurations for Installation of Monofacial and Bifacial PV Technologies, Solar Energy, Vol. 266, 112184, 2023, https://doi.org/10.1016/j.solener.2023.112184.

10.1016/j.solener.2023.112184
5

Kim, K. J., Lee, I. S., and Kim, J. U., Analysis of Power Generation Performance by Applying Operational Algorithms for Bifacial Photovoltaic Module, Korean Institute of Illuminating and Electrical Installation Engineers, Vol. 33, No. 4, pp. 13-23, 2019, https://doi.org/10.5207/JIEIE.2019.33.4.013.

10.5207/JIEIE.2019.33.4.013
6

Minuto, F. D., Crosato, M., Schiera, D. S., Borchiellini, R., and Lanzini, A., Shared Energy in Renewable Energy Communities: The Benefits of East- and West-facing Rooftop Photovoltaic Installations, Energy Reports, Vol. 11, pp. 5593-5601, 2024, https://doi.org/10.1016/j.egyr.2024.05.054.

10.1016/j.egyr.2024.05.054
7

Kim, Y. H., Han, G. R., Lee, H. S., and Kim, Y. R., Development of a Methodology to Evaluate the Impact of East-West Facing Photovoltaic Systems on Power System Operation, Korean Solar Energy Society, Vol. 43, No. 5, pp. 19-32, 2023, https://doi.org/10.7836/kses.2023.43.5.019.

10.7836/kses.2023.43.5.019
8

PVsyst, PVsyst 8, 2025. https://www.pvsyst.com/pvsyst-8. last accessed on the 1st March 2025.

9

Kim, G. C., Oh, M. S., Han, K. H., and Ryu, S. R., Comparative Analysis for Vertical Photovoltaic System Based on Light-receiving Efficiency and Solar Installation Area, Korean Institute of Architectural Sustainable Environment and Building Systems, Vol. 16, No. 1, pp. 35-44, 2022, https://doi.org/10.22696/jkiaebs.20220004.

Information
  • Publisher :Korean Solar Energy Society
  • Publisher(Ko) :한국태양에너지학회
  • Journal Title :Journal of the Korean Solar Energy Society
  • Journal Title(Ko) :한국태양에너지학회 논문집
  • Volume : 45
  • No :3
  • Pages :39-46
  • Received Date : 2025-03-31
  • Revised Date : 2025-04-23
  • Accepted Date : 2025-04-24
  • DOI :https://doi.org/10.7836/kses.2025.45.3.039
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