DOI: 10.1016/j.renene.2020.01.119
论文题名: Number of maximum power points in photovoltaic arrays during partial shading events by clouds
作者: Lappalainen K. ; Valkealahti S.
刊名: Renewable Energy
ISSN: 9601481
出版年: 2020
卷: 152 语种: 英语
英文关键词: Irradiance change
; Maximum power point
; Partial shading
; Photovoltaic array
; Photovoltaic power generation
Scopus关键词: Energy dissipation
; Solar energy
; Irradiance change
; Maximum power point
; Partial shading
; Photovoltaic arrays
; Photovoltaic power generation
; Photovoltaic cells
; algorithm
; array
; electrical power
; performance assessment
; photovoltaic system
; power generation
英文摘要: This article presents a study of the number of maximum power points (MPPs) of photovoltaic (PV) module arrays during partial shading events by clouds. Around 9000 shadow edges were identified in measured irradiance data, and the electrical characteristics of 250–500 PV module arrays with different configurations were studied during the irradiance changes. It was found that most of the partial shading events caused by clouds do not cause multiple MPPs for PV arrays, even for a moment. The number of MPPs was found to decrease with the increasing number of parallel-connected PV strings, but to increase strongly with the increasing length of the strings. According to the results, the use of a total-cross-tied electrical PV array configuration leads to worse system performance compared to a simple series-parallel configuration during partial shading events. Dark shadows with sharp edges moving parallel to the PV strings caused the largest MPP numbers, up to 20. The results show that energy losses due to operation at a local MPP instead of the global one during partial shading events by clouds have only a minor effect on the total energy production of PV arrays. © 2020 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158147
Appears in Collections: 气候变化与战略
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作者单位: Tampere University, Electrical Engineering, P.O. Box 692, Tampere, FI-33101, Finland
Recommended Citation:
Lappalainen K.,Valkealahti S.. Number of maximum power points in photovoltaic arrays during partial shading events by clouds[J]. Renewable Energy,2020-01-01,152