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[IEEE 2019 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET) - Istanbul, Turkey (2019.8.26-2019.8.27)] 2019 International Conference on Power Generation Systems and Renewable Energy Technologies (PGSRET) - Modeling Photovoltaic String in PLECS Under Partial Shading
摘要： The industry of solar energy and its application areas have developed and received much attention over the last two decades. Therefore, the types of photovoltaic (PV) system simulations are investigated and mostly discussed models close to the physical behaviour of a PV panel or system. Under the real conditions such as cloud coverage, the shadows of nearby objects, dusty air, and dirty surface area, etc. result in partial shading issue, which is the core problem of predicting how the system behaves electrically. This paper describes the electrical behaviour model of an established PV string consisting of an experimental curve of CHN250-60P panel shown in the datasheet. The simulation model is performed through the instrumentality of Piecewise Linear Electrical Simulation (PLECS) Block-set in MATLAB/Simulink platform. With the proposed model, the I-V and P-V curves of the system can be represented according to the values of a 3D Lookup Table (LUT). Consequently, the simulation results are dealt with partial shading issue to verify a correct model in different solar irradiance and temperature.
关键词： modeling,Photovoltaic systems,PLECS?,MATLAB,partial shading
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Multilevel-Boost-Converter-Neutral-Point-Clamped-Inverter Photovoltaic System with MPPT Based on Fibonacci Search
摘要： This paper deals with a system composed by a photovoltaic array feeding a Neutral-Point-Clamped inverter by a dc-dc multilevel boost converter. The system is able to adequately operate under partial shading condition. A current control allows for the boost converter to operate at high frequency while the Maximum Power Point Tracking (MPPT) with the help of Fibonacci search. System operation is explained as well as its model, control and PWM strategy. Simulation and experimental results validate the theoretical studies.
关键词： Fibonacci search,Photovoltaic systems,maximum power point tracking,NPC inverter,partial shading,boost multilevel
更新于2025-09-12 10:27:22
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Investigation of effect of batch-separation on the micro-energy generation in M.indica L. dye-sensitized Solar Cells
摘要： The technology of silicon panels has improved over the years with the application of silicon into several material architecture. However, the high cost of the technology has limited its wide adoption. Recent advances have shown that natural materials employed as dye sensitizers for solar cells provide viable alternatives at low cost. This study focused on implementing Mango (Magnifera indica Linn.) leaf dye as dye sensitizer for solar cells. Unlike previous approaches, it employed batch-separated M.indica L. to sensitize two groups of dye-sensitized solar cells (DSCs). Parameters such as short circuit current (Isc), open circuit voltage (Voc), maximum power (Pmax), fill factor (ff), incident photon to conversion efficiency (IPCE) and output efficiency (?) were used to determine the outcome of the M.indica L. DSCs. The doctor blade method and high temperature sintering at 450 0C was used in the preparation of both photoanodes. Photovoltaic results reveal DSCs with a higher efficiency of 4.75 x 10-3 % in crude M.indica L. than 0.07 x 10-3 % for batch separated hexane faction of M.indica L. under same conditions of standard air mass. Remarkably, the hexane M.indica L.DSC recorded larger values of Isc and Voc. The significance of this result is that crude M.indica L DSCs are more affordable, have a facile production process and is an ecologically safe alternatives to silicon solar cells. Although the efficiencies are comparatively low, further research with a solar simulator and co-sensitization with other dyes is recommended for a better outcome.
关键词： Energy Efficiency,Photovoltaic Systems,Energy harvesting,Solar Power,Sustainable Energy
更新于2025-09-12 10:27:22
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[IEEE 2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) - Delhi, India (2018.10.22-2018.10.24)] 2018 2nd IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems (ICPEICES) - Condition Monitoring of Photovoltaic Systems Using Machine Leaming Techniques
摘要： Condition monitoring of any system is essential to maintain its healthy operation as it results in getting maximum revenue with minimum maintenance and operation costs. The main objective of this paper is to develop a fault detection algorithm capable of classifying different faults that can be occur in a Photovoltaic (PV) systems. Output characteristics of the PV system are used as valuable information to observe various types of faults and their locations. Wavelet transforms and neural network systems were adapted to filter the non-significant anomalies and make it easier to detect faults that are to be taken care of in a timely manner. The neural network (NN) classification adapts Multilayer perceptron (MLP) to identify the type and location of occurring faults. Wavelet transform (WT) based signal processing technique is utilized in the feature extraction process to provide inputs to the NN. The developed detection algorithm is adapted for 24/7 automated surveillance. The developed algorithm achieved 98.2% accuracy when tested on a predetermined fault data set.
关键词： Neural Network,Fault Detection,Wavelet Transform,Machine Learning,Photovoltaic Systems
更新于2025-09-12 10:27:22
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A Maximum Power Point Tracking Algorithm for Photovoltaic Systems under Partially Shaded Conditions
摘要： This paper shows a modification of the traditional ‘perturb and observe’ algorithm used to the maximum power point tracking in photovoltaic systems. The proposal is justified by the need of algorithms to track the global maximum power point in solar panels connected in series under partially shaded conditions. The proposal tracks the global maximum power point avoiding the previous iterative search in local maximums. The algorithm performance is evaluated by simulations in the software PSIM and its behavior is compared with the traditional perturb and observe algorithm. The results show the outstanding performance of the modified algorithm in the tracking of the global maximum power point under different non uniform conditions of temperature and irradiance in the solar array.
关键词： perturb and observe algorithm,photovoltaic systems,DC-DC converters,maximum power point tracking
更新于2025-09-12 10:27:22
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[IEEE 2019 International Conference on Smart Energy Systems and Technologies (SEST) - Porto, Portugal (2019.9.9-2019.9.11)] 2019 International Conference on Smart Energy Systems and Technologies (SEST) - Comparative Study of Sky Diffuse Irradiance Models Applied to Photovoltaic Systems
摘要： The increasing energy demand and the search for greener energy resources are expanding interests on photovoltaic systems. These systems need an accurate climatic and irradiation data in order to precisely estimate the energy yield of PV systems. However, most of the available irradiance data, are only for the horizontal plane. The precise estimation of the total irradiance incident on the surface of photovoltaic modules is one of the most important steps in the performance analysis of PV systems. In order to estimate the irradiance on a tilted surface from the irradiance data on the horizontal plane, there are many models available in the literature, they can be classi?ed in isotropic and anisotropic models. This study aims to access the performance of an isotropic and three anisotropic models, which are used by PV system simulation softwares, and the impact of each of them on the estimated energy generation. The results are compared with measured energy data collected at Politec?, Arac?ariguama in Brazil. Results showed that positioning the module at the correct tilted angle and facing north can optimise the global irradiance incident on the module’s surface. Hay & Davies model presented the lowest Mean Bias Error and Root Mean Squared Error while also showing a correlation coef?cient close to 1.
关键词： Sky diffuse models,Solar irradiance,Isotropic model,Anisotropic models,Photovoltaic systems
更新于2025-09-12 10:27:22
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Annual performance analysis of different maximum power point tracking techniques used in photovoltaic systems
摘要： This paper presents an annual performance evaluation of three maximum power point tracking (MPPT) methods. The used MPPT techniques (Perturb and Observe, Incremental Inductance and Sliding mode) are evaluated under an annual data of atmospheric conditions of the target site. The main contribution of this work is to consider real fluctuation conditions of solar irradiations, ambient temperatures and wind velocities. It was found that the Sliding mode provides higher energy yields independently of the period. Compared to the basic P&O and the IC techniques, sliding mode has the potential of generating up to 8.18% more electrical energy than other techniques.
关键词： Annual performance,Photovoltaic systems,Maximum power point tracking (MPPT)
更新于2025-09-12 10:27:22
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Impact of Subsystems on the Overall System Availability for the Large Scale Grid-connected Photovoltaic Systems
摘要： This paper demonstrates the impact of subsystem availability on a large scale grid-connected photovoltaic (PV) systems’ performance. Subsystem denotes to the installation of some subassemblies, which can be very small or gigantic in size, that serve this subsystem and the overall system. The analysis is largely based on a huge worldwide dataset of failures and repairs of various subassemblies, derived from different large scale grid-connected solar-PV systems. Major subsystems, such as a photovoltaic inverters (PVI), are also included, which are shown to have a signi?cant impact for improving on the overall system availability. An improved reliability block diagram (RBD) with an exponential probability distribution function is presented for estimating the reliability and availability performance of seven practical grid-connected solar-PV systems. In addition, availability importance measures are employed to rank various subsystems with regards to their impact on the overall system availability. Accordingly, it will be helping in identifying the subsystems that the planned maintenance should focus on in order to achieve the desired level of the availability. The secure operation of the system will be achieved by this approach. The implementation demonstrates the efficiency and the effectiveness of the proposed approach which may significantly contribute to enhancing the system availability.
关键词： reliability block diagram,failure rates,availability importance measures,repair rates,reliability,Photovoltaic systems,availability
更新于2025-09-12 10:27:22
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Computer Simulation and Investigations of the Roof Mount Photovoltaic System
摘要： The interest in the renewable energy sources is increasing due to the depletion of the conventional energy sources and the environmental pollution. In this paper we present a computer simulation and investigations of the roof mounted photovoltaic system. The results of the generated power of the 5kW built-in photovoltaic system by months over a period of 5 years are presented. Depending on the meteorological conditions, the investigated photovoltaic system generates year-round energy necessary for the needs of the household.
关键词： computer simulation inverters,photovoltaic systems,Computational modeling
更新于2025-09-12 10:27:22
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Autonomous Load Sharing Technique in Solar Photovoltaic System Based DC Microgrid
摘要： In this article, efforts have been made to study, analyze and implement the autonomous current sharing technique by using two parallel connected Solar Photovoltaic (SPV) systems with maximum power point tracking controller (MPPT) considering cable resistances. It mainly formulates a procedure to minimize the current sharing mismatch across load by controlling the duty cycle of MPPT controller. Also, an analysis of various factors affecting (SPV) characteristics has been reported. Further, the system has been analyzed with two interconnected SPV systems to a common load, and an accurate load sharing phenomenon has been achieved by using adaptive gain tuning technique. The proposed scheme has been verified by conducting the experiments, and its results have been explored for various irradiation and load conditions. Experimental results reveal that at all conditions current from the sources are equally shared to loads and adequate rest is delivered to energy storage systems.
关键词： Adaptive gain tuning algorithm,Load sharing techniques,Solar Photovoltaic systems
更新于2025-09-12 10:27:22