Effects of partial shading on energy and exergy efficiencies for photovoltaic panels

2017 ◽  
Vol 164 ◽  
pp. 58-69 ◽  
Author(s):  
Fatih Bayrak ◽  
Gamze Ertürk ◽  
Hakan F. Oztop
Keyword(s):  
Partial Shading ◽  
Photovoltaic Panels ◽  
Energy And Exergy

scholarly journals Growth and Physiological Characteristics of Lettuce (Lactuca sativa L.) and Rocket (Eruca sativa Mill.) Plants Cultivated under Photovoltaic Panels

2018 ◽  
Vol 46 (1) ◽  
pp. 206-212 ◽  
Author(s):  
Angeliki KAVGA ◽  
Georgios TRYPANAGNOSTOPOULOS ◽  
George ZERVOUDAKIS ◽  
Yiannis TRIPANAGNOSTOPOULOS
Keyword(s):  
Solar Radiation ◽  
Photosynthetic Rate ◽  
Lactuca Sativa ◽  
The Other ◽  
Physiological Characteristics ◽  
Eruca Sativa ◽  
Partial Shading ◽  
Photovoltaic Panels ◽  
Lactuca Sativa L ◽  
Other Hand

Energy demand of greenhouses is an important factor for their economics and photovoltaics can be considered an alternative solution to cover their electrical and heating needs. On the other hand, plants cultivated under different solar radiation intensities usually appear different physiological adaptations. The objective of this research was to investigate the effect of photovoltaic panels’ induced partial shading on growth and physiological characteristics of lettuce (Lactuca sativa L.) and rocket (Eruca sativa Mill.) plants. Our results indicate that lettuce productivity and the corresponding photosynthetic rate were not affected under the photovoltaic cultivation in comparison with the reference one. On the other hand, the rocket cultivation was less productive and showed lower photosynthetic rate under photovoltaic panels than in the reference greenhouse. The different physiological response between lettuce and rocket seems to be associated with the effect of environmental factors such as solar radiation intensity, temperature and humidity apart from the possible inherent characteristics of each plant species.

scholarly journals A Hybrid Maximum Power Point Search Method Using Temperature Measurements in Partial Shading Conditions

2014 ◽  
Vol 21 (4) ◽  
pp. 733-740 ◽  
Author(s):  
Janusz Mroczka ◽  
Mariusz Ostrowski
Keyword(s):  
Solar Panel ◽  
Maximum Power ◽  
Global Maximum ◽  
Maximum Power Point ◽  
Partial Shading ◽  
Decision Algorithm ◽  
Photovoltaic Panel ◽  
Photovoltaic Panels ◽  
Local Maxima ◽  
Power Point

Abstract Photovoltaic panels have a non-linear current-voltage characteristics to produce the maximum power at only one point called the maximum power point. In the case of the uniform illumination a single solar panel shows only one maximum power, which is also the global maximum power point. In the case an irregularly illuminated photovoltaic panel many local maxima on the power-voltage curve can be observed and only one of them is the global maximum. The proposed algorithm detects whether a solar panel is in the uniform insolation conditions. Then an appropriate strategy of tracking the maximum power point is taken using a decision algorithm. The proposed method is simulated in the environment created by the authors, which allows to stimulate photovoltaic panels in real conditions of lighting, temperature and shading.

Validation of a Simulation Model for Analysis of Shading Effects on Photovoltaic Panels

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Samuel K. Nashih ◽  
Carlos A. F. Fernandes ◽  
João Paulo N. Torres ◽  
João Gomes ◽  
P. J. Costa Branco
Keyword(s):  
Circuit Simulation ◽  
World Market ◽  
Partial Shading ◽  
Photovoltaic Panels ◽  
The World ◽  
Energy Conversion Process ◽  
Technology Corporation ◽  
Simulation Results ◽  
Shading Effects ◽  
Good Agreement

Numerical simulation results and modeling on the electrical features of concentrating photovoltaic-thermal (PVT) using the free circuit simulation package from linear technology corporation (LTSPICE) are presented. The effects of partial shading of cell strings and temperature are analyzed, showing very good agreement with the results obtained experimentally in lab, at Lisbon University, and under outdoor testing using similar receivers, at the SME Solarus Sunpower AB, a Swedish company whose mission is the development, production, and marketing of concentrated solar technology to the world market. The potential of the used methodology for the design of the solar cell configuration is emphasized as an important tool to optimize PV and PVT performances in the energy conversion process.

scholarly journals Analyse the Effects of Partial Shading Conditions on Solar Photovoltaic Panels

2021 ◽  
Vol 9 (VI) ◽  
pp. 4167-4172
Author(s):  
Prateek Singh
Keyword(s):  
Reverse Bias ◽  
The Other ◽  
Solar Photovoltaic ◽  
Partial Shading ◽  
Photovoltaic Panels ◽  
Photovoltaic Array ◽  
Pv Cell ◽  
Temperature Environment ◽  
In Series ◽  
A Current

In a solar photovoltaic array, the shadow may cover its PV cells. In partial shading conditions, the PV characteristic gets more complicated with multiple numbers of peaks. The aim of this model is to analyses the different partial shading situations and also their effects on the operation. This is done by simulation in MATLAB/Simulink2015a software. In this, three PV panels of 250 watt are connected in series for analysing the output. Different irradiances with specified temperature environment are provided to the panel to form the I-V and P-V curve. Due to shading, the output of the panels gets decreased if there is increment in the shaded portion and due to this in a PV strings there will be a current mismatch while in the parallel strings there will be a voltage mismatch. To stop the damage from the other side i.e., from reverse bias, we use bypass diodes. These diodes are placed parallel to each PV cell so that voltage does not become negative and we obtain a good amount of output in case of partial shading also.

scholarly journals Review of Control Techniques in Microinverters

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6486
Author(s):  
Diego Rojas ◽  
Javier Muñoz ◽  
Marco Rivera ◽  
Jaime Rohten
Keyword(s):  
Fossil Fuels ◽  
High Efficiency ◽  
New Technologies ◽  
Negative Impact ◽  
Control Strategies ◽  
Robustness Analysis ◽  
Power Converter ◽  
Partial Shading ◽  
Photovoltaic Panels ◽  
Point Tracking

The use of renewable energies sources is taking great importance due to the high demand for electricity and the decrease in the use of fossil fuels worldwide. In this context, electricity generation through photovoltaic panels is gaining a lot of interest due to the reduction in installation costs and the rapid advance of the development of new technologies. To minimize or reduce the negative impact of partial shading or mismatches of photovoltaic panels, many researchers have proposed four configurations that depend on the power ranges and the application. The microinverter is a promising solution in photovoltaic systems, due to its high efficiency of Maximum Power Point Tracking and high flexibility. However, there are several challenges to improve microinverter’s reliability and conversion efficiency that depend on the proper control design and the power converter design. This paper presents a review of different control strategies in microinverters for different applications. The control strategies are described and compared based on stability, dynamic response, topologies, and control objectives. One of the most important results showed that there is little research regarding the stability and robustness analysis of the reviewed control strategies.

A Hybrid Model of Photovoltaic Power Stations for Model Ling Tasks of Large Power Systems

2021 ◽  
Vol 69 (4) ◽  
pp. 43-49
Author(s):  
Nikolay RUBAN ◽  
◽  
Vladimir RUDNIK ◽  
Igor RAZZHIVIN ◽  
Anton KIEVEC ◽  
...  
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Station ◽  
Partial Shading ◽  
Large Power ◽  
Photovoltaic Panels ◽  
Power Stations ◽  
Photovoltaic Power ◽  
Software And Hardware ◽  
The Impact

Renewable energy sources are being actively penetrated in the global energy sector, with the main growth being achieved by new photovoltaic power stations. At the same time, the influence of photovoltaic power stations on the operation of power systems is known. This is primarily due to the inconstancy of the weather, which leads to a decrease in the output of each specific photovoltaic panel and power station as a whole. To study the effect of partial shading of photovoltaic panels on the parameters of its operation, various models of the current-voltage characteristics of photovoltaic cells are used in the world, while detailed two-diode models show the best results. The use of detailed models allows to get complete information about the processes in a variety of photovoltaic panels of a power station, as well as other elements of it, such as a voltage converter. This makes it possible to assess the impact of these processes on the external power system. However, for detailed modelling of large photovoltaic power stations as part of power systems, it is necessary to use powerful software and hardware systems. Such systems include the Hybrid real-time power system simulator. This simulator is a multiprocessor installation that provides a solution to the aggregate model of the power system through the use of three approaches to modelling: digital, analogue and physical. The article presents the results of experimental studies of software and hardware tools for modelling a photovoltaic power station, developed on the basis of a hybrid approach to modelling electric power systems.

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