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Switch fault diagnosis for boost DC–DC converters in photovoltaic MPPT systems by using high-gain observers
摘要： Open- and short-circuit faults (OSCFs) in boost dc–dc converters for photovoltaic (PV) maximum power point trackers (MPPTs) imply an inefficiency after fault is triggered, which affect the security and profitability of PV projects. Hence, fault detection and isolation (FDI) techniques have become an important issue for PV technology. In this study, a model-based FDI technique is proposed to boost dc–dc converters in PV MPPT systems. As is well-known, major issues of model-based FDI techniques have always been parametric uncertainty and no-modelled dynamics. This study focuses on how to mitigate these shortcomings by applying a high-gain observer (HGO) as a residual generator. A striking feature of HGO's is that exponential stability is still guaranteed for bounded disturbances (or faults). As demonstrated in this study, under an integral control action in the closed-loop control system, OSCFs are characterised for ever-growing signals, enabling the suggested FDI scheme. Also, the FDI proposal is decoupled from PV current (irradiance changes) and load variations, thereby avoiding false alarms. Moreover, the output-injection gain and thresholds are selected such that the fault diagnosis is achieved in eight switching cycles, enabling a fast and reliable diagnosis. Experimental results are illustrated to validate the FDI scheme proposed in this study.
关键词： photovoltaic MPPT systems,boost dc–dc converters,parametric uncertainty,fault detection and isolation,no-modelled dynamics,high-gain observers
更新于2025-09-11 14:15:04
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Experimental and Theoretical Research on Bending Behavior of Photovoltaic Panels with a Special Boundary Condition
摘要： Currently, the photovoltaic (PV) panels widely manufactured on market are composed of stiff front and back layers and the solar cells embedded in a soft polymeric interlayer. The wind and snow pressure are the usual loads to which working PV panels need to face, and it needs the panels keep undamaged under those pressure when they generate electricity. Therefore, an accurate and systematic research on bending behavior of PV panels is important and necessary. In this paper, classical lamination theory (CLT) considering soft interlayer is applied to build governing equations of the solar panel. A Rayleigh–Rita method is modified to solve the governing equations and calculate the static deformation of the PV panel. Different from many previous researches only analyzing simply supported boundary condition for four edges, a special boundary condition which consists of two opposite edges simply supported and the others two free is studied in this paper. A closed form solution is derived out and used to do the numerical calculation. The corresponding bending experiments of PV panels are completed. Comparing the numerical results with experiment results, the accuracy of the analytical solutions are verified.
关键词： bending behavior,classical lamination theory,bending experiment,photovoltaic panel,Rayleigh–Rita method,special boundary condition
更新于2025-09-11 14:15:04
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17% efficiency organic photovoltaic cell with superior processability
摘要： The development of organic photoactive materials, especially the new-emerging non-fullerene electron acceptors (NFAs), has enabled rapid progress in organic photovoltaic (OPV) cells in recent years. Although the power conversion efficiencies (PCEs) of the top-performance OPV cells have surpassed 16%, the devices are usually fabricated via a spin-coating method and are not suitable for large-area production. Here, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using the scalable blade-coating processing technology. Our results suggest that the optimization of the chemical structures of the OPV materials can improve the device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.
关键词： non-fullerene acceptor,processability,power conversion efficiency,organic photovoltaic cells,scalable large-area production
更新于2025-09-11 14:15:04
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[IEEE 2018 2nd European Conference on Electrical Engineering and Computer Science (EECS) - Bern, Switzerland (2018.12.20-2018.12.22)] 2018 2nd European Conference on Electrical Engineering and Computer Science (EECS) - Maximum Power Point Tracking Algorithm Implementation for a Photovoltaic Panel Using Model Predictive Control
摘要： The present investigation proposes a mathematical model of a solar panel, based on a Predictive Control by Model that will allow to use information with a prediction horizon, to advance the possible actions to be taken and ensure that the solar panel delivers during its operation, the highest potential. The alternative discussed in this document is presented with examples and comparisons so that in this way the reader has the ability to choose the most optimal type of control for their functionalities and features.
关键词： photovoltaic system,Monitoring of the maximum power point,predictive control by model,generalized predictive control
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Industry Applications Society Annual Meeting - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Industry Applications Society Annual Meeting - A New Magnetic Linked Active Neutral Point Clamp Converter for Transformer-less Direct Grid Integration of Solar Photovoltaic Systems
摘要： The multilevel inverters are becoming increasingly popular for use in the grid integration of wind and photovoltaic (PV) power plants due to their higher voltage handling capability and the better output power quality. There are several types of multilevel inverters that have been proposed in the literature; among them the active neutral point clamp (ANPC) multilevel inverters have been drawing significant attention specially for reducing unequal loss distribution. However, with the increase of number of levels, the ANPC requires more electronic switches and flying capacitors, by which the complexity and the cost increases. In this paper, a reduced number of switch and flying capacitor ANPC inverter is presented for the grid integration of the solar PV systems. Moreover, the proposed power converter effectively utilizes the dc bus voltage compared with the traditional ANPC converter. In the proposed inverter, a high frequency transformer is used to eliminate the voltage balancing problems faced by the traditional ANPC inverters. The proposed magnetic linked power converter provides the galvanic isolation, which is one of the most critical issues for traditional transformer-less grid connected PV systems. The proposed topology makes the control strategy simple and makes the power conversion system reliable for the photovoltaic power plants.
关键词： grid integration,inverter,ANPC,loss distribution,solar photovoltaic
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Industry Applications Society Annual Meeting - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Industry Applications Society Annual Meeting - Control of Single Phase Solar Photovoltaic Supply System
摘要： This work deals with the modified multilayer fifth order generalized integrator (MLFOGI) based grid tied single phase solar photovoltaic (PV) system employing fuzzy logic control (FLC) based maximum power point tracking (MPPT) algorithms. The MLFOGI is used to extract the fundamental component of grid voltage under polluted grid due to voltage sag, swell, harmonics, frequency variations and dc offsets. The FLC based MPPT is capable to extract optimum energy under change in weather conditions. It offers fast dynamic response under reduced PV voltage oscillation. The proposed system is developed on MATLAB 2018a and obtained results shows the feasibility of system control and Total Harmonics Distortions (THDs) of grid current are in acceptable limits as per IEEE-519 standard.
关键词： Multilayer Fifth Order Generalized Integrator (MLFOGI),Maximum Power Point Tracing (MPPT),Fuzzy Logic Control (FLC),Voltage Source Inverter (VSI),Solar Photovoltaic System (SPV)
更新于2025-09-11 14:15:04
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Performance Analysis of a Grid-Connected Rooftop Solar Photovoltaic System
摘要： Turkey is among the countries largely dependent on energy import. This dependency has increased interest in new and alternative energy sources. Installation of rooftop solar photovoltaic systems (RSPSs) in Turkey is increasing continuously regarding geographical and meteorological conditions. This paper presents an insight into the potential situation for Turkey and a simulation study for the RSPS designing and calculation for the faculty building at Marmara University in Istanbul. This simulation study demonstrates that 84.75-kWp grid-connected RSPS can produce remarkable power. The system is performed in detail with the PV*SOL software (Premium 2017 R8-Test Version, Valentin Software GmbH, Berlin, Germany). Detailed financial and performance analysis of the grid-connected RSPS for faculty building with various parameters is also carried out in this study. According to the simulation results, the system supplies 13.2% of the faculty buildings’ annual electrical energy consumption. The annual savings value of faculty buildings’ electrical consumption is approximately 90,298 kWh energy which costs roughly $7296. A photovoltaic (PV) system installation for the faculty building, which has considerable potential for solar energy and sunshine duration, is indispensable for clean energy requirements and was supported by the simulation results. This paper can be considered to be a basic feasibility study prior to moving on to the implementation project.
关键词： faculty building,performance analysis,rooftop solar photovoltaic
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Robust Reconfiguration of Distribution Network Considering the Access of Photovoltaic Electric Vehicle Charging Tower
摘要： The large-scale application of electric vehicles has led to an increase in the number of charging piles. Charging piles are gradually emerging as charging towers containing new energy sources. The charging load of electric vehicles has brought great uncertainty to the distribution network, and has brought impact to the operation of the distribution network. Considering the uncertainties of charging load of EV, a scene-based multi-period robust reconfiguration model is established in this paper. By defining new variables, the dual transformation process of conventional robust optimization is simplified, and the model is solved by CPLEX solver in GAMS platform. Finally, the effectiveness of the proposed method is verified by an IEEE-33 node example.
关键词： photovoltaic electric vehicle charging tower,second order cone,scenario,robust,distribution network reconfiguration
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - A strategy for suppressing the second harmonic of output power for photovoltaic grid-connected inverters with low voltage ride-through
摘要： When an unbalanced voltage drop occurs in the grid system, output power of distributed photovoltaic grid-connected system will generate second harmonics. In order to suppress the second harmonic, a new low voltage ride-through control strategy is proposed, which can adjust the harmonic suppression target according to the degree of voltage drop. This strategy can suppress the second harmonic of active power when the voltage drop is low, and suppress the second harmonic of reactive power when the voltage drop is large. The control strategy is simulated in MATLAB, and the results testified its effectiveness.
关键词： Photovoltaic grid-connected system,Harmonic suppression,Low voltage ride-through,Unbalanced voltage drop
更新于2025-09-11 14:15:04
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[IEEE 2019 54th International Universities Power Engineering Conference (UPEC) - Bucharest, Romania (2019.9.3-2019.9.6)] 2019 54th International Universities Power Engineering Conference (UPEC) - Quality Check during Manufacturing of Custom Photovoltaic Modules with Back-Contact Cells
摘要： The Electroluminescence (EL) analysis and the current-voltage (I-V) curves determination of PhotoVoltaic (PV) generators are the most used diagnosis methods to check the presence of defects. In the present work, these tests are applied to Interdigitated Back Contact (IBC) PV modules with customizable shape after their manufacturing. A defect is detected in a large number of modules, suggesting an issue related to the semi-automatic manufacturing procedure. Therefore, a detailed analysis is carried out to localize the cause of the defect and a preventive action is proposed in order to reduce the occurrence frequency of the defect during manufacturing.
关键词： back contacts,electroluminescence,photovoltaic,electrical contacts,current-voltage characteristic,defects,interdigitated
更新于2025-09-11 14:15:04