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[IEEE 2019 Global LIFI Congress (GLC) - Paris, France (2019.6.12-2019.6.13)] 2019 Global LIFI Congress (GLC) - LiFi Reception from Organic Photovoltaic Modules Subject to Additional DC Illuminations and Shading Effects
摘要： In this paper, we study the performance of organic photovoltaic (OPV) modules as LiFi receivers in two specific configurations. The PV-based LiFi receiver is first exposed to an additional homogeneous light source with different intensity levels and then the influence of partial lighting is studied (shading effect). In both cases, we compare the sensibility and the cutoff frequency of LiFi transmission when the solar cell is operated either in short-circuit mode (i.e. when it is loaded with an active transimpedance amplifier) or in open circuit mode (i.e. when it is terminated with an high impedance passive load). While the OPV module performance decreases in open-circuit mode as a function of the DC illumination level, we observe an improvement of the cutoff frequency in short circuit mode. This result seems very promising for outdoor LiFi transmissions but also for indoor conditions where natural light can disturb LiFi communications. Theoretical explanations involving physical parameters for energy harvesting (carrier mobility, lumped series resistance) are proposed to justify the observed behaviors. Finally, experimental results of shaded solar cells are provided in the two operating modes (open-circuit and short-circuit). We show that sensibility and bandwidth of OPV modules strongly depend on both the shading configuration and the operating mode.
关键词： OPV,shading effects,LiFi,open-circuit mode,organic photovoltaic,short-circuit mode
更新于2025-09-16 10:30:52
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[IEEE 2019 Fifth International Conference on Science Technology Engineering and Mathematics (ICONSTEM) - Chennai, India (2019.3.14-2019.3.15)] 2019 Fifth International Conference on Science Technology Engineering and Mathematics (ICONSTEM) - Implementation of Enhanced Global Search Particle Swarm Optimization Algorithm for Photovoltaic Systems
摘要： Solar Power is the potential alternative to other sources of energy due to its pure and readily available nature. Solar power wattage is not always wonted or constant. It is due to its unaccustomed multi-peak power voltage characteristics exhibited by a variable swing in environmental conditions and shading effects. Swarm Intelligence has been playing a vital role in optimization problem owing to its intelligibility and directness. This article presents an Inertia Modified Particle Swarm Optimization (IM-PSO) algorithm for photovoltaic power extraction. The proposed method helps to keep track of the maximum power point in lesser effort thereby ensuring proper maximum power. The algorithm is modeled in MATLAB/SIMULINK simulated environment. The results prove it especial to other traditional techniques.
关键词： Optimization,MPPT,Inertia Factor,Partial Shading effects,PSO
更新于2025-09-16 10:30:52
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Reliability implications of partial shading on CIGS photovoltaic devices: A literature review
摘要： Partial shading of Cu(In,Ga)(Se,S)2 (CIGS) photovoltaic (PV) modules is getting more attention, as is witnessed by the increase in publications on this topic in recent years. This review will give an overview of shading tests executed on CIGS modules and focuses on the more fundamental aspects that are often studied on cells. Generally, CIGS modules display very attractive performance under predictable row-to-row shading. However, potential damage could occur under nonoptimal shading orientations: module output after shading tests could reduce due to the formation of local shunts, often called wormlike defects. The influence of many factors on the formation of these defects, including the internal currents and voltages and the shape and intensity of the shade, will be discussed. This review allows an increased insight in the degradation mechanisms caused by partial shading, which would ultimately lead to the introduction of more shade-tolerant CIGS PV products in the future.
关键词： photovoltaic modules,partial shading,CIGS,wormlike defects,reliability
更新于2025-09-16 10:30:52
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LLC Resonant Voltage Multiplier-Based Differential Power Processing Converter Using Voltage Divider with Reduced Voltage Stress for Series-Connected Photovoltaic Panels under Partial Shading
摘要： Partial shading on photovoltaic (PV) strings consisting of multiple panels connected in series is known to trigger severe issues, such as reduced energy yield and the occurrence of multiple power point maxima. Various kinds of differential power processing (DPP) converters have been proposed and developed to prevent partial shading issues. Voltage stresses of switches and capacitors in conventional DPP converters, however, are prone to soar with the number of panels connected in series, likely resulting in impaired converter performance and increased circuit volume. This paper proposes a DPP converter using an LLC resonant voltage multiplier (VM) with a voltage divider (VD) to reduce voltage stresses of switches and capacitors. The VD can be arbitrarily extended by adding switches and capacitors, and the voltage stresses can be further reduced by extending the VD. Experimental verification tests for four PV panels connected in series were performed emulating partial shading conditions in a laboratory and outdoor. The results demonstrated the proposed DPP converter successfully precluded the negative impacts of partial shading with mitigating the voltage stress issues.
关键词： LLC converter,differential power processing converter,voltage multiplier,voltage divider,photovoltaic system,partial shading
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Method to trace the photovoltaic characteristic curves under partial shading conditions
摘要： The I-V curve is an important parameter, because it has the characteristics of PV panel. It shows compactly that happens in the module due external variations. In this article presents a method to trace the photovoltaic curves under partial shading conditions. Also, it mentions the effects of the bypass diode. Lastly, it makes comparisons between curves of shaded panels and panels with regular irradiance.
关键词： Photovoltaic systems,Lambert function,Newton-Raphson,PV partial shading
更新于2025-09-16 10:30:52
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Performance enhancement of Hybrid interconnected Solar Photovoltaic array using shade dispersion Magic Square Puzzle Pattern technique under partial shading conditions
摘要： During Partial Shading (PS) condition, Solar Photovoltaic (SPV) array exhibits multiple peaks in both Power-voltage and Current-voltage characteristics, leading to Mismatch Power Losses (MPL). Overcoming the losses, enhancing power and performance improvement of SPV array during PS conditions is a challenging task. MPL due to PS condition, not only depend on the shaded area, but also on SPV array Interconnections and Shading Patterns. The present investigation aims to enhance the output power of SPV array subjected to PS conditions. Studies are initially performed on eight combinations of SPV array test panel interconnections. Results obtained imply improved performance of the ‘Proposed New Reconfigured Hybrid interconnected array’ under four defined different typical partial shading conditions. Also, performance of ‘Proposed New Hybrid interconnected array’ with ‘Shade Dispersion Magic Square Puzzle Pattern’ technique applied is shown to be superior, compared with either SUDUKO or ODD-EVEN shade dispersion technique.
关键词： Shade Dispersion Magic Square Puzzle Pattern (SDMSPP),Solar Photovoltaic (SPV),Hybrid Interconnections,Partial Shading (PS),Power Enhancement
更新于2025-09-16 10:30:52
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Analysis and experimental validation of partial shading mitigation in photovoltaic system using integrated dc–dc converter with maximum power point tracker
摘要： An integrated dc–dc converter with maximum power point tracker (IDCCM) is an electronic device that can be utilised to increase the output power of a photovoltaic generation system. Despite its potential benefits, there is an absence of a comprehensive analytical work to characterise the IDCCM performance under different partial shading conditions. Thus, this work proposes an analytical method to evaluate the system with IDCCM for different shading pattern/intensity, irradiance, and temperature. To validate the analysis, the SPV 1020 boost-type IDCCM devices are incorporated into a 2?kWp experimental test-rig. The performance of the IDCCM is benchmarked against the conventional system that utilises bypass diodes (alone). The results indicate that the IDCCM improves the performance of the central inverter as it ensures the latter consistently tracks the global peak. Also, it was found that that the performance of the IDCCM depends on the shading intensity: at low intensity, the IDCCM is able to extract energy from the shaded modules; however, it is ineffective at high shading intensity. Furthermore, when the shading is absent, the energy gained by the IDCCM is offset by the continuous power losses due to its internal operations.
关键词： maximum power point tracker,partial shading,dc–dc converter,photovoltaic,IDCCM
更新于2025-09-16 10:30:52
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Novel methodology for detecting non-ideal operating conditions for grid-connected photovoltaic plants using Internet of Things architecture
摘要： The use of photovoltaic solar power generation is rising as worldwide energy demand increases. Therefore, reliability, safety, life cycle, and improved efficiency of photovoltaic plants have all become a major concern in research nowadays. In this context, monitoring systems are necessary to guarantee the required operating productivity and to avoid overpriced maintenance costs. This paper studies the non-ideal operating conditions for grid-connected photovoltaic plants and proposes an anomaly detection methodology that combines the advantages of the 2-sigma, short-window simple-moving average control charts with shading strength and irradiance transition parameters to detect early deviation in photovoltaic plant operational data. The key aspect of proposed methodology is that it requires neither historical data for model training procedure nor parameters from previous simulation. Only instantaneous meteorological and electrical parameters are required. The efficiency of the condition monitoring methodology has been validated through experimental results conducted in actual operating conditions. Results demonstrated that the proposed methodology is effective to identify non-ideal operating conditions for grid-connected photovoltaic plants, i.e., (i) normal operating condition, (ii) natural dynamic shading, (iii) artificial dynamic shading, and (iv) artificial static shading. Moreover, a low-cost and non-invasive internet-of-things-based embedded architecture is proposed to monitor photovoltaic plant operation in real-time.
关键词： Condition monitoring,Shading types,Non-ideal operating conditions,Anomaly detection,Grid-connected photovoltaic plants
更新于2025-09-16 10:30:52
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Optimum capacity of the inverters in concentrator photovoltaic power plants with emphasis on shading impact
摘要： Nowadays, there is wide experience on selecting an adequate ratio between the photovoltaic array peak power and the inverter capacity for conventional photovoltaic systems. However, when dealing with concentrator photovoltaic plants, the problem is more complex and the results obtained with conventional methods are not directly applicable. There are few studies regarding concentrator photovoltaic technology and all of them neglect the impact of shading. In this paper, based on the experimental characterisation of a typical concentrator photovoltaic module, a power plant model is developed, which takes into consideration shading, module misalignment, and different inverter con?guration schemes for optimising the inverter capacity. The inverter size is analysed for different ground cover ratios (from 12% to 52%), inverter schemes (micro-, string-, and tracker-inverters), inverter ef?ciencies (low-, medium-, and high-ef?ciency), climatic conditions (Granada, Marrakech, and Frenchman Flat), and economic conditions (system cost excluding inverters from 850 to 1400 V/kWp). Results show values for the DC-to-AC sizing ratio ranging from 1.01 to 1.67 (maximum performance ratio), and from 1.53 to 1.79 (minimum levelised cost of energy). String-inverters exhibit the best behaviour in terms of levelised cost of energy, except in shadow-free systems, in which tracker-inverters behave better.
关键词： Inverter size,Concentrator photovoltaics,Levelised cost of energy,Ef?ciency improvement,Shading,Inverter con?guration
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Electrical, Communication, and Computer Engineering (ICECCE) - Swat, Pakistan (2019.7.24-2019.7.25)] 2019 International Conference on Electrical, Communication, and Computer Engineering (ICECCE) - Degradation of PhotoVoltaic (PV) Panel Performance due to Shading Effect- Case of Pakistan
摘要： Pakistan is geographically suitable for the installation of Photovoltaic (PV) cells to produce electricity. Pakistan covers the maximum of its land where sunny days prevail throughout the year. The energy produced from these panels can be affectively distributed throughout and excess of it can be provided to the nearby grid. The population of Pakistan is tremendously enhancing due to which construction of buildings is growing up causing shading that harmfully affects the performance of PV panel. The production of electricity from the renewable energy sources is surely considerate and friendly. No detrimental chemicals are given out making the environment pollution free. The performance of the PV cells solely depends upon many factors i.e. intensity of light, shading, temperature, dust and cells configuration. In this paper the shading effect over the PV cells and how to nullify its substandard effect on the performance of PV panel is overviewed. It was accounted that the depletion in the maximum output power & short circuit current was 34% and 40% respectively due to the 30% shading strength in mono crystalline PV panel. For the better efficiency of the PV array, modules are coupled in the series and parallel configuration to enhance the voltage & current respectively. Bypass diodes are instigated to overwhelm the shading effect.
关键词： PV panel,shading effect,Short Circuit Current,Renewable source of energy,Maximum Power Output
更新于2025-09-16 10:30:52