- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Towards non-destructive individual cell I-V characteristic curve extraction from photovoltaic module measurements
摘要： In this work, a non-destructive, automated procedure to extract the I-V characteristics of individual cells of fully encapsulated photovoltaic (PV) modules is proposed. The approach is able to correctly identify and extract the electrical parameters of underperforming cells, due for example to defects or degradation. The approach uses multiple I-V measurements on the PV module assuming specific levels of shading on the individual cells. The single circuit models for the cells are obtained through the solution of an inverse fitting problem. The approach was validated in a simulated environment through statistical analysis, with the cell parameters based on real silicon PV devices. The computational complexity of the approach is also investigated and validation examples with different configurations of PV modules, including bypass diodes are presented. The approach was validated on several tests to assess noise robustness, flexibility in terms of cells non-uniformities and scalability towards larger systems, resulting in a lean and accurate procedure for I-V curves extraction. The proposed methodology can be potentially utilised for automated quality assurance and fault assessment of PV modules, investigation of degradation mechanisms of cells in PV modules, or quantitative validation of other optical imaging techniques such as luminescence imaging and infrared thermography.
关键词： Automated procedure,I-V characteristics,Bypass diodes,Non-destructive testing,Degradation,Photovoltaic modules
更新于2025-09-23 15:21:01
-
Novel Open-Circuit Photovoltaic Bypass Diode Fault Detection Algorithm
摘要： In this article, a novel photovoltaic (PV) bypass diode fault detection algorithm is presented. The algorithm consists of three main steps. First, the threshold voltage of the current–voltage (I–V) curve is obtained using different failure bypass diode scenarios. Second, the theoretical prediction for the faulty regions of bypass diodes is calculated using the analysis of voltage drop in the I–V curve as well as the voltage at maximum power point. Finally, the actual I–V curve under any environmental condition is measured and compared with theoretical predictions. The proposed algorithm has been experimentally evaluated using a PV string that comprises three series-connected PV modules, and subtotal of nine bypass diodes. Various experiments have been conducted under diverse bypass diodes failure conditions. The achieved detection accuracy is always greater than 99.39% and 99.74% under slow and fast solar irradiance transition, respectively.
关键词： current–voltage (I–V) curve,Bypass diodes,power loss,fault detection,photovoltaics (PV),solar irradiance
更新于2025-09-19 17:13:59
-
Observation of P-V And I-V Characteristics Before and After Partial Shadow Effect on Photovoltaic Array Using Boost Converter
摘要： The fundamental power generation unit for photovoltaic is solar PV module. The staging of PV array pivot on environmental conditions like operating temperature, solar heatstroke, array layout. PV line-up get partial shadow effect due to shadow of trees, poles, buildings…etc. Under such conditions the array gets more complicated and it will have spare than one alp. It is very dominant to forecast the attributes of PV array under partial shadow effect to procure maximal power. More distant hotspots, discrepancy losses will occur as well as these lead to certainty and constancy problems. It is still more extortionate and difficult to get control pivot of P-V and I-V under partial shadow effect. Sun Power SPR-305-WHT-U solar panel is taken as reference and the learning cornerstone on output power peak at different solar irradiation levels. This paper also deals with the importance of bypass diodes
关键词： Photovoltaic array,Partial shadow effect,Matlab /Simulink,Bypass diodes
更新于2025-09-16 10:30:52