scholarly journals A Novel Fault Classification Approach for Photovoltaic Systems

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 308 ◽  
Author(s):  
Varaha Satya Bharath Kurukuru ◽  
Frede Blaabjerg ◽  
Mohammed Ali Khan ◽  
Ahteshamul Haque
Keyword(s):  
Single Phase ◽  
Failure Detection ◽  
Fault Classification ◽  
Early Failure ◽  
Pv System ◽  
Electrical Systems ◽  
Pv Systems ◽  
And Performance ◽  
Training Efficiency ◽  
Better Than

Photovoltaic (PV) energy has become one of the main sources of renewable energy and is currently the fastest-growing energy technology. As PV energy continues to grow in importance, the investigation of the faults and degradation of PV systems is crucial for better stability and performance of electrical systems. In this work, a fault classification algorithm is proposed to achieve accurate and early failure detection in PV systems. The analysis is carried out considering the feature extraction capabilities of the wavelet transform and classification attributes of radial basis function networks (RBFNs). In order to improve the performance of the proposed classifier, the dynamic fusion of kernels is performed. The performance of the proposed technique is tested on a 1 kW single-phase stand-alone PV system, which depicted a 100% training efficiency under 13 s and 97% testing efficiency under 0.2 s, which is better than the techniques in the literature. The obtained results indicate that the developed method can effectively detect faults with low misclassification.

scholarly journals ANN Fed High Gain Luo Converter based Reduced Switch Multilevel Inverter for Single Phase Network Bridged PV Arrangement

2019 ◽  
Vol 9 (2S4) ◽  
pp. 604-610
Keyword(s):  
High Frequency ◽  
Single Phase ◽  
Closed Loop ◽  
High Gain ◽  
Maximum Energy ◽  
Multilevel Inverter ◽  
Solar Irradiation ◽  
Pv System ◽  
Pv Systems ◽  
Grid Synchronization

In the present scenario photovoltaic (PV) systems feature resonant interest in the recent researches. The amount from the PV frame is highly oscillated due to temperature variation. In this proposed work, the ANN based MPPT algorithm extracts maximum energy from the PV system by benefit of high gain DC-DC Luo converter, the Luo converter produced voltage is given to the single phase grid through reduced switch seven level inverter. The proposed seven level inverter is controlled by high frequency technique multicarrier modulation technique. The PI controller based closed loop grid synchronization is implemented for solving the power quality issues. The multilevel inverter reduce the total harmonics distortion in the output AC voltage waveform. The developed work is carried out using Matlab software-based simulation with various solar irradiation and degree. Keywords: Artificial Neural Network

scholarly journals Tailored Algorithms for Anomaly Detection in Photovoltaic Systems

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 225 ◽  
Author(s):  
Pedro Branco ◽  
Francisco Gonçalves ◽  
Ana Cristina Costa
Keyword(s):  
Time Series ◽  
Alternative Energy ◽  
Weather Conditions ◽  
Electricity Production ◽  
Pv System ◽  
Detection Algorithms ◽  
Pv Systems ◽  
Adverse Weather ◽  
Full Capacity ◽  
And Performance

The fastest-growing renewable source of energy is solar photovoltaic (PV) energy, which is likely to become the largest electricity source in the world by 2050. In order to be a viable alternative energy source, PV systems should maximise their efficiency and operate flawlessly. However, in practice, many PV systems do not operate at their full capacity due to several types of anomalies. We propose tailored algorithms for the detection of different PV system anomalies, including suboptimal orientation, daytime and sunrise/sunset shading, brief and sustained daytime zero-production, and low maximum production. Furthermore, we establish simple metrics to assess the severity of suboptimal orientation and daytime shading. The proposed detection algorithms were applied to a set of time-series of electricity production in Portugal, which are based on two periods with distinct weather conditions. Under favourable weather conditions, the algorithms successfully detected most of the time-series labelled with either daytime or sunrise/sunset shading, and with either sustained or brief daytime zero-production. There was a relatively low percentage of false positives, such that most of the anomaly detections were correct. As expected, the algorithms tend to be more robust under favourable rather than under adverse weather conditions. The proposed algorithms may prove to be useful not only to research specialists, but also to energy utilities and owners of small- and medium-sized PV systems, who may thereby effortlessly monitor their operation and performance.

scholarly journals A Critical Appraisal of PV-Systems’ Performance

Buildings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 192
Author(s):  
Zainab Usman ◽  
Joseph Tah ◽  
Henry Abanda ◽  
Charles Nche
Keyword(s):  
Renewable Energy ◽  
Electric Energy ◽  
Geographical Location ◽  
Poor Performance ◽  
Performance Ratio ◽  
Energy Output ◽  
Pv System ◽  
Pv Systems ◽  
Energy Technologies ◽  
And Performance

Climate change and global warming have triggered a global increase in the use of renewable energy for various purposes. In recent years, the photovoltaic (PV)-system has become one of the most popular renewable energy technologies that captures solar energy for different applications. Despite its popularity, its adoption is still facing enormous challenges, especially in developing countries. Experience from research and practice has revealed that installed PV-systems significantly underperform. This has been one of the major barriers to PV-system adoption, yet it has received very little attention. The poor performance of installed PV-systems means they do not generate the required electric energy output they have been designed to produce. Performance assessment parameters such as performance yields and performance ratio (PR) help to provide mathematical accounts of the expected energy output of PV-systems. Many reasons have been advanced for the disparity in the performance of PV-systems. This study aims to analyze the factors that affect the performance of installed PV-systems, such as geographical location, solar irradiance, dust, and shading. Other factors such as multiplicity of PV-system components in the market and the complexity of the permutations of these components, their types, efficiencies, and their different performance indicators are poorly understood, thus making it difficult to optimize the efficiency of the system as a whole. Furthermore, mathematical computations are presented to prove that the different design methods often used for the design of PV-systems lead to results with significant differences due to different assumptions often made early on. The methods for the design of PV-systems are critically appraised. There is a paucity of literature about the different methods of designing PV-systems, their disparities, and the outcomes of each method. The rationale behind this review is to analyze the variations in designs and offer far-reaching recommendations for future studies so that researchers can come up with more standardized design approaches.

Stability Analysis of Grid-Connected Photovoltaic Systems

2012 ◽  
pp. 254-270
Author(s):  
M. A. Mahmud ◽  
M. Jahangir Hossain ◽  
H. R. Pota
Keyword(s):  
Feedback Linearization ◽  
Single Phase ◽  
Pv System ◽  
Maximum Power Point ◽  
Linearization Technique ◽  
Pv Systems ◽  
Current Controller ◽  
Power Point ◽  
The Stability ◽  
Pv Power Generation

This chapter presents an overview Photovoltaic (PV) power generation and integration of PV systems with power grid. This chapter also presents a Feedback Linearizing Current Controller (FBLCC) to synchronize the PV system with the grid. This controller is designed based on the feedback linearization technique. The reference current for the controller is generated from the Maximum Power Point Tracker (MPPT). The stability of a single-phase grid connected PV system is analyzed through the Lyapunov function. To do these things, a suitable mathematical model of grid-connected PV system is also presented in this chapter. The performance of the designed controller is tested on a single-phase grid-connected PV system.

Analysis and Performance of a Two-Axis PV Tracker in Southern Spain

2011 ◽  
Vol 133 (1) ◽  
Author(s):  
G. Almonacid ◽  
E. Muñoz ◽  
F. Baena ◽  
P. Pérez-Higueras ◽  
J. Terrados ◽  
...  
Keyword(s):  
Southern Spain ◽  
Performance Ratio ◽  
System Behavior ◽  
Average Yield ◽  
Pv System ◽  
Yield Increase ◽  
Pv Systems ◽  
Productivity Data ◽  
And Performance ◽  
The University

El Girasol, a two-axis photovoltaic (PV) tracker system of 9.6 kWp connected to the grid at the Campus of the University of Jaén in Southern Spain, has reached an average yield of 2092 kWh/kWp·year. As far as it is known, it is one of the highest productivity data reported up to now in PV systems. This paper presents a description of the system and the working analysis during 2 years of operation. Related to the system behavior, the following performances are highlighted: global efficiency of 10.4%, performance ratio of 73.1%, a yield increase versus a fixed and ideally faced PV system of 45.8%, and high operation reliability with minimal maintenance needs.

scholarly journals Low-Voltage Ride-Through Capability of a Single-Stage Single-Phase Photovoltaic System Connected to the Low-Voltage Grid

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Yongheng Yang ◽  
Frede Blaabjerg
Keyword(s):  
Distribution System ◽  
Single Phase ◽  
Control Method ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Pv System ◽  
Pv Systems ◽  
Low Voltage Ride Through ◽  
Three Phase ◽  
Future Challenges

The progressive growing of single-phase photovoltaic (PV) systems makes the Distribution System Operators (DSOs) update or revise the existing grid codes in order to guarantee the availability, quality, and reliability of the electrical system. It is expected that the future PV systems connected to the low-voltage grid will be more active with functionalities of low-voltage ride-through (LVRT) and the grid support capability, which is not the case today. In this paper, the operation principle is demonstrated for a single-phase grid-connected PV system in a low-voltage ride-through operation in order to map future challenges. The system is verified by simulations and experiments. Test results show that the proposed power control method is effective and the single-phase PV inverters connected to low-voltage networks are ready to provide grid support and ride-through voltage fault capability with a satisfactory performance based on the grid requirements for three-phase renewable energy systems.

Design and Performance of the Amonix High Concentration Solar PV System

Solar Energy ◽  
2002 ◽  
Author(s):  
Kenneth W. Stone ◽  
Vahan Garboushian ◽  
Herb Hayden
Keyword(s):  
New World ◽  
Energy Performance ◽  
Solar Pv ◽  
Operating Characteristics ◽  
High Concentration ◽  
Pv System ◽  
Pv Systems ◽  
Solar Pv System ◽  
And Performance ◽  
Installation Time

Amonix has designed, manufactured, installed, and tested over 500 kW of high concentrating PV systems based around a concentrating silicon cell that set a new world efficiency record in 1992. This paper describes the development of this product as well as the physical and operating characteristics of the system. The operating characteristics that make this system attractive for grid, distributed, and off-grid are discussed. Data is presented that demonstrates the high daily power generating capability and the energy performance of the concentrating PV system. Other attributes of the system are also discussed such as the automatic/unattended operation, the short installation time, etc. An array installed at Pomona, CA is described, it has operated unattended for over 3 years and is still producing power today.

scholarly journals Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1743 ◽  
Author(s):  
Cristian Verdugo ◽  
Samir Kouro ◽  
Christian A. Rojas ◽  
Marcelo A. Perez ◽  
Thierry Meynard ◽  
...  
Keyword(s):  
Single Phase ◽  
High Efficiency ◽  
Renewable Energy Sources ◽  
Multilevel Converters ◽  
Pv Systems ◽  
Cascade Connection ◽  
Phase Converter ◽  
And Performance ◽  
Level Converter ◽  
And Control

Multilevel converters are widely considered to be the most suitable configurations for renewable energy sources. Their high-power quality, efficiency and performance make them interesting for PV applications. In low-power applications such as rooftop grid-connected PV systems, power converters with high efficiency and reliability are required. For this reason, multilevel converters based on parallel and cascaded configurations have been proposed and commercialized in the industry. Motivated by the features of multilevel converters based on cascaded configurations, this work presents the modulation and control of a rooftop single-phase grid-connected photovoltaic multilevel system. The configuration has a symmetrical cascade connection of two three-level T-type neutral point clamped power legs, which creates a five-level converter with two independent string connections. The proposed topology merges the benefits of multi-string PV and symmetrical cascade multilevel inverters. The switching operation principle, modulation technique and control scheme under an unbalanced power operation among the cell are addressed. Simulation and experimental validation results in a reduced-scale power single-phase converter prototype under variable conditions at different set points for both PV strings are presented. Finally, a comparative numerical analysis between other T-type configurations to highlight the advantages of the studied configuration is included.

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