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A new educational software package for photovoltaic system feasibility: PVGUI
摘要： With the increase in the market share of renewable energy sources, the feasibility analysis of the renewable energy-based power systems has also gained importance. In this study, a MATLAB-based interface for the feasibility analysis of photovoltaic systems is proposed in order to be used in educational purposes. The interface has been presented to the students of Yildiz Technical University as an educational material, and positive feedback has been received from the majority of the students.
关键词： MATLAB/GUI,Photovoltaic system,feasibility analysis
更新于2025-09-16 10:30:52
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Impact of optimum power factor of PV-controlled inverter on the aging and cost-effectiveness of oil-filled transformer considering long-term characteristics
摘要： The photovoltaic (PV) system is one of the most widespread of the renewable energy generation systems that are being used to meet the continuously increasing energy demand. A proposed analytical method is used to find the optimum power factor of PV inverter (PVI) that leads to minimum aging, reduced energy losses cost of the transformer, lower payback period of PV system, and lower green houses gases (GHG) emissions due to the transformer energy losses. In this study, the thermal performance of a 630?kVA mineral oil-filled transformer is simulated in MATLAB programming language. For an association, it is mandatory to connect a PV system to the grid to minimise the transformer loading. The PV output power is used to study the long-term impact of the solar irradiance on the transformer thermal performance. Also, the long-term climatic characteristics are considered. The ambient temperature surrounding the transformer is considered all day long. The load current profile was measured all day long. The results show the aging and cost-effectiveness of the transformer and the payback period of PV system and GHG emissions are a function of PVI power factor.
关键词： transformer aging,PV inverter,photovoltaic system,power factor,cost-effectiveness,GHG emissions
更新于2025-09-16 10:30:52
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The Improvement of an Islanding Detection Method Based on the Perturbation Signal in Case of a Multi-Photovoltaic Operation
摘要： Islanding phenomenon is one of the consequences of the emergence and development of microgrids in the power system. Injected signal cancellation is a common problem in a multi-distributed generation that has a significant influence on active islanding detection methods. In this study, this issue was analyzed by injecting a perturbation signal in the multi-photovoltaic system. Furthermore, the promising solution to eliminate injected signal cancellation was proposed in this paper. The solution was validated through mathematical explanations and simulation results.
关键词： active islanding detection method,DC grid,photovoltaic system,perturbation signal,multi-distributed generations,islanding detection,injected signal,cancellation
更新于2025-09-16 10:30:52
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Integrated step-up non-isolated inverter with leakage current elimination for grid-tied photovoltaic system
摘要： This study presents a non-isolated step-up inverter without leakage current for low-voltage renewable energy generation such as photovoltaic (PV) cells grid connection. From the structure of the proposed inverter, the negative terminal of the PV array is directly linked with the grid neutral, so the common mode voltage of the parasitic capacitance can be kept constant and the leakage current will not be generated in theory. Moreover, this transformerless inverter can produce an AC output voltage higher than the input DC voltage, which will reduce the sizes of the generation system. A switching modulation strategy carrier-based is analysed in detail when the input inductor current is operated in discontinuous conduction mode. The operation modes of the proposed inverter are also discussed, respectively, in positive and negative half line cycles. Finally, a digital experimental prototype is tested in the laboratory, and the experimental results are consistent with the theoretical analysis.
关键词： leakage current elimination,non-isolated inverter,transformerless inverter,step-up inverter,grid-tied photovoltaic system
更新于2025-09-16 10:30:52
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[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - A Secondary Classification Fault Diagnosis Strategy Based on PCA-SVM for Cascaded Photovoltaic Grid-connected Inverter
摘要： The cascaded H-bridge multilevel inverter for grid-connected photovoltaic(PV) system has the advantages of high power quality and easy modularization, but as the levels of the inverter increase, the failure probability of the power switching devices will also increase. In the open-circuit faults of the power switching devices, there are two groups of similar faults that are difficult to distinguish. To solve this problem, a secondary classification fault diagnosis strategy based on PCA-SVM is proposed. The first classification is used to make a preliminary fault diagnosis between all types of faults, the second classification is to make a further diagnosis of the two groups of similar faults. Finally, compared with other fault diagnosis strategies, the proposed strategy improves the accuracy of fault diagnosis.
关键词： Fault Diagnosis,Photovoltaic System,Principal Components Analysis,Cascaded Multilevel Inverter,Support Vector Machine
更新于2025-09-16 10:30:52
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A Fault Diagnosis Strategy Based on Multilevel Classification for a Cascaded Photovoltaic Grid-Connected Inverter
摘要： In this paper, an effective strategy is presented to realize IGBT open-circuit fault diagnosis for closed-loop cascaded photovoltaic (PV) grid-connected inverters. The approach is based on the analysis of the inverter output voltage time waveforms in healthy and faulty conditions. It is mainly composed of two parts. The first part is to select the similar faults based on Euclidean distance and set the specific labels. The second part is the classification based on Principal Component Analysis and Support Vector Machine. The classification is done in two steps. In the first, similar faults are grouped to do the preliminary diagnosis of all fault types. In the second step the similar faults are discriminated. Compared with existing fault diagnosis strategies for several fundamental periods and under different external environments, the proposed strategy has better robustness and higher fault diagnosis accuracy. The effectiveness of the proposed fault diagnosis strategy is assessed through simulation results.
关键词： fault diagnosis,support vector machine,cascaded multilevel inverter,principal components analysis,closed-loop photovoltaic system
更新于2025-09-16 10:30:52
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[IEEE 2019 AEIT International Annual Conference (AEIT) - Florence, Italy (2019.9.18-2019.9.20)] 2019 AEIT International Annual Conference (AEIT) - Predictive Current Control for a Neutral Point Clamped Inverter Considering SiC-MOSFET as Switches and Using a Photovoltaic Power Source
摘要： This paper proposes a predictive current control of a three-phase 3-level neutral point clamped (3L-NPC) inverter. The main contribution of this paper is the analysis of the effects of the DC LINK voltage on the output of the 3L-NPC on a specific class of power semiconductor, namely SiC-MOSFET. The power source of the DC LINK is a photovoltaic array, the process to choose the number of series panels is a heuristic method. All analyses and results were conducted through simulations, using Matlab/Simulink.
关键词： Neutral point clamped converter,predictive current control,photovoltaic system,SiC-MOSFET
更新于2025-09-16 10:30:52
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Optimization Study of Parasitic Energy Losses in Photovoltaic System with Dual-Axis Solar Tracker Located at Different Latitudes
摘要： Despite the sun-tracking system maximising the annual yield of solar power generation, the inevitable parasitic energy losses from the sun-tracking mechanism related to range of motion should be considered. This paper presents a systematic approach to investigate the annual accumulated parasitic energy losses in photovoltaic (PV) or concentrator photovoltaic (CPV) system installed in a dual-axis solar tracker located at various locations with latitudes ranging from 45°N to 45°S. This approach allows the engineers to evaluate and to optimize the PV/CPV system performance by determining the least parasitic energy loss in the cases of fixed and non-fixed stow positions. The results show that the solar tracker with non-fixed stow position always has lower annual accumulated parasitic energy losses as compared to that of fixed stow position located in different latitudes.
关键词： Concentrator photovoltaic system,Photovoltaic system,Dual-axis solar tracker,Azimuth-elevation tracking,General sun-tracking formula,Parasitic energy losses
更新于2025-09-12 10:27:22
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Assessment of the Carbon and Cost Savings of a Combined Diesel Generator, Solar Photovoltaic, and Flywheel Energy Storage Islanded Grid System
摘要： The use of diesel generators to provide power for islanded grids has been the technology of choice but they generate substantial carbon emissions unless the part or all the fuel comes from a renewable source. Notwithstanding this, the engine must be sized to meet maximum demand and will operate ine?ciently at part load most of the time, which is particularly bad for a synchronous constant speed engine. Given the availability of low cost solar photovoltaic (PV) systems, it is very enticing to ?t a diesel generator and allow the engine to be turned o? during PV generation. However, this combination will not work without some form of energy storage since it takes time for the engine to start, leading to gaps in supply and instability of the system. Lithium-ion batteries are typically considered to be the best solution to this problem because they have a high response rate, costs are lower, and they are available as products. However, they will su?er from the limited cycle and calendar life due to high cycling requirements in the application described. It is, therefore, proposed that a ?ywheel system could o?er a lower lifetime cost alternative since only short duration bridging power storage is needed and ?ywheels of appropriate design can o?er lower power cost than Lithium-ion battery systems. Flywheels are particularly attractive since they have a very high calendar with almost an in?nite cycle life and are fully recyclable at the end of life. This research, therefore, presents an assessment of the ?ywheel energy storage system (FESS) as an alternative to electrochemical batteries to supplement solar PV systems backed up by diesel generators. The model of an islanded PV system combined with a diesel generator and a FESS supplying power to a residential load is implemented in MATLAB/Simulink. The results of the analysis for the cases with and without storage based on a number of di?erent charge-discharge strategies provide evidence to support this hypothesis.
关键词： dynamic model,standalone hybrid system,solar photovoltaic system,backup diesel generator,flywheel energy storage
更新于2025-09-12 10:27:22
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[IEEE 2019 Second International Conference on Advanced Computational and Communication Paradigms (ICACCP) - Gangtok, India (2019.2.25-2019.2.28)] 2019 Second International Conference on Advanced Computational and Communication Paradigms (ICACCP) - Design and Analysis of an $H_{\infty}$ Controller for a Single Phase Grid Connected Photovoltaic System with Parametric Uncertainties
摘要： This paper presents the synthesis of a H∞ controller for a single phase single stage grid connected photovoltaic (PV) system. The PV array is integrated to the utility grid using an inverter and a filter. Many a times while deriving the mathematical model of a system, there exists some discrepancy between the actual and the derived model of the system. Hence these uncertainties should be taken into account while deriving the controller for the system in order to achieve robust stability. Here the robust controller is designed taking into consideration the uncertainty in the parameters R, L and C. An appropriate state space model of the system is derived in order to facilitate the controller design with the perturbations. Here the controller is designed to as to meet the required objective of good reference tracking, disturbance rejection and robust stability. The controller design step involves the proper selection of weighing function and solution of the cost functions. The cost functions in this case are transfer function from exogenous inputs to output of the system to be minimized. It was observed that in order to achieve the required performance criteria the infinity norm of the cost functions should be less than unity. For this an h infinity optimization problem was solved using the hinfsyn command in MATLAB. A transient analysis was done in MATLAB simulation to see the effect of output disturbance on the system performance. A μ-synthesis was further done to test whether the system is robustly stable under parametric uncertainties. It was found that the designed controller is robustly stable, effectively track the reference input given to the system. Also the effect of disturbances in the system output is minimized.
关键词： Photovoltaic system,single-phase grid,H∞ controller,parametric uncertainties
更新于2025-09-12 10:27:22