홀수스트링 PV모듈의 바이패스 다이오드 배치에 의한 전기적 특성
Electrical Characteristics of PV Modules with Odd Strings by Arrangement on Bypass Diode
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Most PV modules are fabricated by 6 cell-strings with solar cells connected in series. Moreover, bypass diodes are generally installed every 2 cell-strings to prevent PV modules from a damage induced by current mismatch or partial shading. But, in the case of special purpose PV module, like as BIPV (Building Integrated Photovoltaic), the number of cell-strings per module varies according to its size. Differ from a module employing even cell-strings, the configuration of bypass diode should be optimized in the PV module with odd strings because of oppositely facing electrodes. Hence, in this study, electrical characteristics of special purposed PV module with odd string was empirically and theoretically studied depending on arrangement of bypass diode. Here, we assumed that PV module has 3 strings and the number of bypass diodes in the system varies from 2 to 6. In case of 2 bypass diodes, shading on a center string increases short circuit current of the module, because of a parallel circuit induced by 2 bypass diodes connected to center string. Also, the loss is larger, as the shading area in the center string is enlarged. Thus, maximum power of the PV module with 2 bypass diode decreases by up to 59 (%) when shading area varies from 50 to 90 (%). On the other hand, In case of 3 and 6 bypass diodes, the maximum power reduction was within about 3 (W), even the shading area changes from 50 to 90 (%). As a result, It is an alternative to arrange the bypass diode by each string or one bypass diode in the PV module in order to completely bypass current in case of shading, when PV module with odd string are fabricated.
Abstract
Most PV modules are fabricated by 6 cell-strings with solar cells connected in series. Moreover, bypass diodes are generally installed every 2 cell-strings to prevent PV modules from a damage induced by current mismatch or partial shading. But, in the case of special purpose PV module, like as BIPV (Building Integrated Photovoltaic), the number of cell-strings per module varies according to its size. Differ from a module employing even cell-strings, the configuration of bypass diode should be optimized in the PV module with odd strings because of oppositely facing electrodes. Hence, in this study, electrical characteristics of special purposed PV module with odd string was empirically and theoretically studied depending on arrangement of bypass diode. Here, we assumed that PV module has 3 strings and the number of bypass diodes in the system varies from 2 to 6. In case of 2 bypass diodes, shading on a center string increases short circuit current of the module, because of a parallel circuit induced by 2 bypass diodes connected to center string. Also, the loss is larger, as the shading area in the center string is enlarged. Thus, maximum power of the PV module with 2 bypass diode decreases by up to 59 (%) when shading area varies from 50 to 90 (%). On the other hand, In case of 3 and 6 bypass diodes, the maximum power reduction was within about 3 (W), even the shading area changes from 50 to 90 (%). As a result, It is an alternative to arrange the bypass diode by each string or one bypass diode in the PV module in order to completely bypass current in case of shading, when PV module with odd string are fabricated.
참고문헌 (13)
- Kang, G. H, "Photovoltaic Module" (2012), Sungandang
- Lee, J. S, "Solar Cell Engineering" (2007), Green
- Bruckman, LS., "Statical and Domain Analytics Applied to PV module Lifetime and Degradation Science", IEEE Acces, 1, pp.384~403 (2013)
- Sharma, V, "Performance and Degradation Analysis for Long Term Reliality of Solar Photovoltaic Systems: A review", Renewable and Sustainable Energy Reiviews, 27, pp.753~767 (2013)
- Jung, T. H., "Output Characteristics of PV module Considering Partially Reverse Biased Conditions", Solar Energy, 92, pp.214~200 (2013)
- Carmen Alonso-Garcia, M., "Analysis and Modelling the Reverse Characteristic of Photovoltaic Cells", Solar Energy Materials and Solar Cells, 90, pp.1105~1120 (2006)
- Herrmann, W., "Operational Behavior of Commercial Solar Cells under Reverse Biased Conditions", Proceedings of the 2nd World Conference on PVSEC, pp.2357~2359 (1988)
- Potnuru, S. R., "Positioning of PV panels for Reducition in Line Loss and Mismatch Losses in PV array", Renewable Energy, 78, pp.264~275 (2015)
- Wang, Y, "An Investigation on Partial Shading of PV modules with Different Connection Configuration of PV cells", Energy, 35, pp.3069~6078 (2011)
- Bauwens, P, "Reducing Partial Shading Power Loss with an Intergrated Smart Bypass", Solar Energy, 103, pp.134~142 (2014)
- 신우균, "Matlab을 이용한 손상된 바이패스 다이오드가 포함된 PV 모듈의 출력 추정", 한국태양에너지학회 논문집, 36(5), pp.63~71 (2016), 한국태양에너지학회
- Go, S. H., "Electric and Thermal Characteristics of Photovoltaic Module under Partial Shading and with a damaged bypass diode", Energy, 128, pp.232~243 (2017)
- Silverstre, S., "Study of Bypass Diodes Configuration on PV modules", Applied Energy, 86, pp.1632~1640 (2009)