scholarly journals Operation of TUT Solar PV Power Station Research Plant under Partial Shading Caused by Snow and Buildings

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Diego Torres Lobera ◽  
Anssi Mäki ◽  
Juha Huusari ◽  
Kari Lappalainen ◽  
Teuvo Suntio ◽  
...  
Keyword(s):  
Measuring System ◽  
Climatic Data ◽  
Building Structures ◽  
Solar Pv ◽  
Research Facility ◽  
Electrical Measurements ◽  
Pv System ◽  
Partial Shading ◽  
Power Characteristics ◽  
Pv Modules

A grid connected solar photovoltaic (PV) research facility equipped with comprehensive climatic and electric measuring systems has been designed and built in the Department of Electrical Engineering of the Tampere University of Technology (TUT). The climatic measuring system is composed of an accurate weather station, solar radiation measurements, and a mesh of irradiance and PV module temperature measurements located throughout the solar PV facility. Furthermore, electrical measurements can be taken from single PV modules and strings of modules synchronized with the climatic data. All measured parameters are sampled continuously at 10 Hz with a data-acquisition system based on swappable I/O card technology and stored in a database for later analysis. The used sampling frequency was defined by thorough analyses of the PV system time dependence. Climatic and electrical measurements of the first operation year of the research facility are analyzed in this paper. Moreover, operation of PV systems under partial shading conditions caused by snow and building structures is studied by means of the measured current and power characteristics of PV modules and strings.

scholarly journals Reconfigurable Distributed Power Electronics Technique for Solar PV Systems

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1121
Author(s):  
Kamran Ali Khan Niazi ◽  
Yongheng Yang ◽  
Tamas Kerekes ◽  
Dezso Sera
Keyword(s):  
Energy Yield ◽  
Solar Pv ◽  
Charge Redistribution ◽  
Pv System ◽  
Partial Shading ◽  
Pv Systems ◽  
Simulation Based ◽  
In Series ◽  
A Cell ◽  
Power Balancing

A reconfiguration technique using a switched-capacitor (SC)-based voltage equalizer differential power processing (DPP) concept is proposed in this paper for photovoltaic (PV) systems at a cell/subpanel/panel-level. The proposed active diffusion charge redistribution (ADCR) architecture increases the energy yield during mismatch and adds a voltage boosting capability to the PV system under no mismatch by connected the available PV cells/panels in series. The technique performs a reconfiguration by measuring the PV cell/panel voltages and their irradiances. The power balancing is achieved by charge redistribution through SC under mismatch conditions, e.g., partial shading. Moreover, PV cells/panels remain in series under no mismatch. Overall, this paper analyzes, simulates, and evaluates the effectiveness of the proposed DPP architecture through a simulation-based model prepared in PSIM. Additionally, the effectiveness is also demonstrated by comparing it with existing conventional DPP and traditional bypass diode architecture.

scholarly journals A Simple Mismatch Mitigating Partial Power Processing Converter for Solar PV Modules

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2308
Author(s):  
Kamran Ali Khan Niazi ◽  
Yongheng Yang ◽  
Tamas Kerekes ◽  
Dezso Sera
Keyword(s):  
Experimental Tests ◽  
Energy Yield ◽  
Power Electronic ◽  
Solar Pv ◽  
Partial Shading ◽  
Loss Analysis ◽  
Pv Systems ◽  
Pv Module ◽  
Pv Modules ◽  
In Series

Partial shading affects the energy harvested from photovoltaic (PV) modules, leading to a mismatch in PV systems and causing energy losses. For this purpose, differential power processing (DPP) converters are the emerging power electronic-based topologies used to address the mismatch issues. Normally, PV modules are connected in series and DPP converters are used to extract the power from these PV modules by only processing the fraction of power called mismatched power. In this work, a switched-capacitor-inductor (SCL)-based DPP converter is presented, which mitigates the non-ideal conditions in solar PV systems. A proposed SCL-based DPP technique utilizes a simple control strategy to extract the maximum power from the partially shaded PV modules by only processing a fraction of the power. Furthermore, an operational principle and loss analysis for the proposed converter is presented. The proposed topology is examined and compared with the traditional bypass diode technique through simulations and experimental tests. The efficiency of the proposed DPP is validated by the experiment and simulation. The results demonstrate the performance in terms of higher energy yield without bypassing the low-producing PV module by using a simple control. The results indicate that achieved efficiency is higher than 98% under severe mismatch (higher than 50%).

scholarly journals Power Enhancement from Solar PV Array Topologies under Partial Shading Condition

2018 ◽  
Vol 10 (01) ◽  
pp. 33-40
Author(s):  
Santosh Kumar Singh ◽  
Anurag Singh Yadav ◽  
Ashutosh Srivastava ◽  
Amarjeet Singh
Keyword(s):  
Maximum Output Power ◽  
Maximum Output ◽  
Solar Photovoltaic ◽  
Solar Pv ◽  
Partial Shading ◽  
Pv Array ◽  
Power Enhancement ◽  
Pv Modules ◽  
Multiple Load ◽  
Mismatch Effect

In this paper, a detailed study is carried out on the solar photovoltaic (PV) array topologies under various shading patterns. The aim of this study is to investigate the mismatch effect losses in PV modules for non uniform irradiations. The shading causes not only power losses, but also non-linearity of P-V characteristics. Under partial shaded conditions, the P-V and I-V characteristics exhibit extreme non-linearity along with multiple load maxima. In this paper, the investigations of the optimal layout of PV modules in a PV array are worked out to provide maximum output power under various shaded conditions. Three type of solar PV array topologies e.g. Series-parallel (SP), Total cross tied (TCT) and Bridge link (BL) are considered for various typesof shaded patterns. The modeling of solar PV array for various types of topologies is done in MATLAB/Simulink environment. The extensive results have been taken on these topologies for partial shading patterns and analyzed, which proves the TCT topology performance is better as compared to other topologies for most of the shading patterns.

scholarly journals Thermographic and electrical characterization of a photovoltaic panel under partial shading conditions: a case study

ACTA IMEKO ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 93
Author(s):  
Giovanni Bucci ◽  
Fabrizio Ciancetta ◽  
Edoardo Fiorucci ◽  
Antonio Delle Femine
Keyword(s):  
Electrical Characterization ◽  
Testing Procedure ◽  
Pv System ◽  
Partial Shading ◽  
Photovoltaic Panel ◽  
Pv Module ◽  
Pv Modules ◽  
Consequent Reduction

<p class="Abstract">Shading is one of the most critical factors that produces a reduction in power in photovoltaic (PV) modules. The main causes of shading are related to cloud cover; local specificity; natural characteristics; building and other civil works; and the presence of the PV system itself. A reduction in overall radiation produces a consequent reduction in electric power. Another more problematic effect is associated with the partial shading of the PV modules. The shaded cell behaves as a load, dissipating energy and increasing its temperature. This effect can involve irreversible changes to the PV module, with a decrease in performance that can even cause the destruction of the shaded cell.</p><p>The main aim of this work is the development of a testing procedure for the performance evaluation of commercial PV modules in the presence of partial shading on one cell. Tests were carried out using thermographic and electric measurements and by varying the shading levels according to IEC standards. Shading up to total darkening is achieved by means of a number of filters that reduce the direct solar irradiance.</p><p>As a case study, a complete characterisation of a 180 Wp polycrystalline PV module was performed according to the proposed testing procedure, showing that high temperatures can be measured on the shaded PV module surface even if only 50 % of the surface of one cell of the PV module is darkened.</p>

scholarly journals Numerical Modeling, Simulation and Evaluation of Conventional and Hybrid Photovoltaic Modules Interconnection Configurations under Partial Shading Conditions

2021 ◽  
Author(s):  
Faisal Saeed ◽  
Haider Ali Tauqeer ◽  
Hasan Erteza Gelani ◽  
Muhammad Hassan Yousuf
Keyword(s):  
Power Loss ◽  
Simulation Analysis ◽  
Maximum Power ◽  
Power Losses ◽  
Partial Shading ◽  
Power Characteristics ◽  
Pv Array ◽  
Pv Modules ◽  
In Series ◽  
Simulation And Evaluation

Partial shading on solar photovoltaic (PV) arrays is a prevalent problem in photovoltaic systems that impair the performance of PV modules and is responsible for reduced power output as compared to that in standard irradiance conditions thereby resulting in the appearance of multiple maximas on panel output power characteristics. These maxims contribute to mismatch power losses among PV modules. The mismatch losses depend on shading characteristics together with different interconnected configuration schemes of PV modules. The research presents a comparative analysis of partial shading effects on a 4 x4 PV array system connected in series(S), parallel (P), serries-parallel (SP),total-cross-tied (TCT),central-cross-tied(CCT),bridge-linked(BL),bridge-linked total cross-tied (BLTCT) ,honey-comb(HC), honey-comb total-cross-tied (HCTCT) and ladder (LD) configurations using MATLAB/Simulink. The PV module SPR-X20-250-BLK was used for modeling and simulation analysis. Each module is comprised of 72 number of PV cells and a combination of 16 PV modules was employed for the contextual analysis. Accurate mathematical modeling for the HCTCT configuration under partial shading conditions (PSCs) is provided for the first time and is verified from the simulation. The different configuration schemes were investigated under short-narrow,short-wide,long-narrow,long-wide, diagonal, entire row distribution, and entire column distribution partial shading condition patterns with mathematical implementation and simulation of passing clouds. The performance of array configurations is compared in terms of maximum power generated ), mismatch power loss (∆), relative power loss ) and the fill factor (FF). It was inferred that on average, TCT configuration yielded maximum power generation under all shading patterns among all PV modules interconnection configurations with minimum mismatch power losses followed by hybrid and conventional PV array configurations respectively.

scholarly journals Interpretation of MPPT Techniques in Grid Connected Solar PV Array System

IJOSTHE ◽  
2019 ◽  
Vol 5 (6) ◽  
pp. 5
Author(s):  
Neha Singh ◽  
Prof. Govind Prasad Pandiya
Keyword(s):  
Renewable Energy Sources ◽  
Maximum Efficiency ◽  
Energy Sources ◽  
Solar Pv ◽  
Pv System ◽  
Partial Shading ◽  
System Architectures ◽  
Pv Systems ◽  
Pv Array ◽  
Uniform Condition

Solar energy is one of the most used and readily available renewable energy sources among the other energy sources. The power generated by PV systems is dependent on solar irradiance and temperature parameters. In the literature, many researchers and studies are interested in estimating true maximum efficiency point for the PV systems. Due to that fact, MPPT applications and techniques become an important issue for PV systems under both uniform and non uniform conditions. Although, PV system under uniform environment has only one maxima point on P-V curve which is simple to estimate correctly by conventional MPPT techniques, it is not as simple as under non-uniform condition such as partial shading and mismatch effects. To overcome the drawbacks of the conventional MPPTs under non uniform condition, researchers has been investigated new soft computing MPPTs, PV array configurations, system architectures and topologies.

Power Enhancement from Solar PV Array Topologies under Partial Shading Condition

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Santosh Kumar Singh ◽  
Anurag Singh Yadav ◽  
Ashutosh Srivastava ◽  
Amarjeet Singh
Keyword(s):  
Maximum Output Power ◽  
Maximum Output ◽  
Solar Photovoltaic ◽  
Solar Pv ◽  
Partial Shading ◽  
Pv Array ◽  
Power Enhancement ◽  
Pv Modules ◽  
Multiple Load ◽  
Mismatch Effect

In this paper, a detailed study is carried out on the solar photovoltaic (PV) array topologies under various shading patterns. The aim of this study is to investigate the mismatch effect losses in PV modules for non uniform irradiations. The shading causes not only power losses, but also non-linearity of P-V characteristics. Under partial shaded conditions, the P-V and I-V characteristics exhibit extreme non-linearity along with multiple load maxima. In this paper, the investigations of the optimal layout of PV modules in a PV array are worked out to provide maximum output power under various shaded conditions. Three type of solar PV array topologies e.g. Series-parallel (SP), Total cross tied (TCT) and Bridge link (BL) are considered for various types of shaded patterns. The modeling of solar PV array for various types oopologies is done in MATLAB/Simulink environment. The extensive results have been taken on these topologies for partial shading patterns and analyzed, which proves the TCT topology performance is better as compared to other topologies for most of the shading patterns.

scholarly journals Power optimization in partially shaded photovoltaic systems

2018 ◽  
Vol 12 (1) ◽  
pp. 34-38
Author(s):  
Halil Erol ◽  
Mahmut Uçman
Keyword(s):  
Climatic Conditions ◽  
Maximum Power ◽  
Hill Climbing ◽  
Solar Pv ◽  
Pv System ◽  
Maximum Power Point ◽  
Partial Shading ◽  
Point Tracking ◽  
Linear Behaviour ◽  
Power Point

The Power-Voltage characteristic of a photovoltaic (PV) array exhibits non-linear behaviour when exposed to uniform solar irradiance. Maximum Power Point (MPP) tracking is challenging due to the varying climatic conditions in a solar PV system. Moreover, the tracking algorithm becomes more complicated due to the presence of multiple peaks in the power voltage characteristics under the condition of partial shading. This research is devoted to the Stochastic Beam Search (SBS) based algorithm and Stochastic Hill Climbing (SHC) for a maximum power point tracking (MPPT) at a partial shading condition in the PV system. To give a partial shading effect over the entire array of a PV system, a mast is placed in front of the modules. The modules in the array are connected in such a way that one does not need to rewire the electrical connection during the rearrangement of modules. It is validated that the power generation performance of an array under a moving shading condition is increased. Furthermore, it is observed that the SHC method outperforms the SBS method in the MMP tracking.

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