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Analysis of the Power Quality of a Grid-Connected Photovoltaic System
摘要： The use of Grid-Connected Photovoltaic Systems is increasingly on the rise in Brazil. Faced with this growth, it is necessary to evaluate the impacts of this source in the electric energy systems. Based on this scenario, the present work aims to analyze and quantify the impact of a grid-connected photovoltaic system connection, evaluating the Electric Power Quality indicators based on the levels specified in Module 8 of the Electric Energy Distribution Procedures in the National Electric System. To perform the data collection, an energy analyzer device was installed at the output of the grid-connected system inverter located in the Energy Laboratory of the Federal Rural Semi-Arid University, located in the city of Mossoró-RN. Using the collected data, it was possible to analyze parameters of voltage and current distortion, power factor, active, reactive and apparent power, voltage, frequency variations, and voltage unbalance. It was observed that the criteria analyzed were within the appropriate standards although there were also verified cases that there was an elevation in tension levels. Finally, it is concluded that the impacts caused are relevant within the electric system, and grid connected system performance was satisfactory, although there are still possibilities for improvements.
关键词： Power Quality,Photovoltaic System,Grid-Connected,Renewable Energy,Distributed Generation
更新于2025-09-23 15:21:01
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[IEEE 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - Agadir, Morocco (2019.11.27-2019.11.30)] 2019 7th International Renewable and Sustainable Energy Conference (IRSEC) - A Genetic Algorithm based Improve P&O-PI MPPT Controller for Stationary and Tracking Grid-Connected Photovoltaic System
摘要： this paper deals the performance comparison and efficiencies of single-axis and dual-axis tracking PV system to an identical fixed-mount PV system for two typical clear sunny days (Ghardaia area), two typical days are chosen, the first day in winter and the second day in the summer. For the three types of PV systems, P&O-PI MPPT techniques optimized with a genetic algorithm is proposed. This paper has two different objectives. 1stly, a proposed MPPT technique has been presented to optimize P&O-PI controller via the GA technique to increase the tracking response of MPP with high efficiency and that improves the limitations of the traditional MPPT techniques. 2ndly, a performance comparison of efficiencies of single-axis and dual-axis tracking system and an identical fixed inclination system .Simulation results with MATLAB/SIMULINK are presented and discussed to verify the satisfactory performance of the proposed MPPT control, in which the optimized P&O-PI controller by GA algorithms gives the better performance. The simulation results also have shown that both single-axis and dual-axis are highly efficient in terms of the electrical energy output when compared to the fixed mount system. The results show the effectiveness of the tracking system of about 25% in energy efficiency.
关键词： grid,photovoltaic system,dual‐axis tracking,P&O-PI,fixed array,boost converter,Genetic algorithm,single axis tracking,MPPT control
更新于2025-09-23 15:21:01
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Technical-economic analysis of the first mini-generation photovoltaic system of Piau?-, Brazil
摘要： The first distributed mini-generation photovoltaic system in the state of Piauí was installed on the Floriano campus of the Federal Institute of Piauí. The system consists of 660 photovoltaic modules and occupies an area of approximately 1.122 m2 of roof. This article aims to evaluate the performance of the first year of operation, which runs from May 2016 to June 2017, compared to technical and economic aspects. The technical analysis was done through the calculation of the indexes of merit: Final Productivity Performance Rate and Capacity Factor. In the economic viability analysis were used the concepts of Net Present Value, Internal Rate of Return, Payback and Cost-Benefit Ratio. The results demonstrate that the system has technical feasibility, since it presented a good generation in its first year of operation, with production superior to other systems installed in public educational institutions of Brazil. In addition, it has shown a positive balance in the Net Present Value, but with a long Payback and a very high Cost-Benefit Ratio, which may compromise its economic viability. However, in view of the institution's final activity, the installation of the photovoltaic system will bring benefits beyond the reduction of electricity consumption, if used in teaching, research and extension activities.
关键词： Operational performance,Economic evaluation,Photovoltaic system
更新于2025-09-23 15:21:01
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Thermal management of concentrator photovoltaic systems using nanoa??enhanced phase change materialsa??based heat sink
摘要： Temperature regulation of concentrator photovoltaic systems is essential in reducing operating temperatures with higher system performance. A new nano-enhanced phase change material, with multi-cavity heat sinks, integrated with a concentrator photovoltaic (CPV) system is developed. The multi-cavity heat sink includes a single-, triple-, and quintuple-cavity configuration in both parallel and series pattern filled with n-octadecane PCM and graphene nanoparticle additives with 2% and 5 wt%. Numerical simulations are performed using the developed two-dimensional model for photovoltaic layers integrated with the nano-enhanced phase change material-based heat sink. The predicted results are compared with the available numerical results and measurements. Results indicate that increasing the number of parallel cavities, along with weight fraction of nanoparticles, significantly improves the thermal conductivity, and consequently attains better performance for the CPV system. Using a parallel quintuple-cavity configuration, with 5 wt% NPCM, achieves maximum reduction in the solar cell mean temperature along with the best temperature uniformity compared to other configurations. At a concentration ratio of 20, the thermal efficiency is 65%, the electrical efficiency is about 10%, and the output electrical power of the system is 235 W per m width of the cell. On the contrary, using a series pattern of the heat sink has an unfavorable effect on the mean solar cell temperature, as well as on electrical efficiency and thermal performance of the CPV system. The obtained result can assist in identifying the best possible design of the heat sink in addition to the most appropriate selection of PCM and nanoparticle additives.
关键词： electrical efficiency,graphene nanoparticles,concentrator photovoltaic system,multi-cavity heat sink,nano-enhanced phase change materials
更新于2025-09-23 15:21:01
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[IEEE 2019 International Conference on Power Electronics, Control and Automation (ICPECA) - New Delhi, India (2019.11.16-2019.11.17)] 2019 International Conference on Power Electronics, Control and Automation (ICPECA) - Machine Learning Based Islanding Detection for Grid Connected Photovoltaic System
摘要： This paper focus on developing a new islanding detection method with the help of machine learning and signal processing technique. The islanding detection method make sure that there is a proper remote monitoring of the grid integrated photovoltaic (PV) system. In case of grid fault or maintained of the grid, a proper informed signal is provided to various distributed generation (DG) networks so that they can disconnect with the grid and operate in isolated mode. A simulation of 1kW grid connected PV system is performed. The signal such as voltage, current and frequency are recorded at point of common coupling (PCC). The feature of recorded signals are extracted using wavelet transformation. The extracted features are used to form a islanding scenarios matrix. The matrix is further utilized to train a classi?er using machine learning algorithm. From the result it can be observed that the trained classi?er depicted 97.9% training accuracy with a training time of 16.9 sec which is better when compared with the literature. Further the trained classi?er is subjected to test with an unknown islanding condition to observe the robustness of the classi?er.
关键词： Islanding detection,complex tree,wavelet transform,Grid integrated photovoltaic system,distribution generation
更新于2025-09-23 15:21:01
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Large-signal analysis based on nonlinear algebraic equations for an integrated photovoltaic modulea??converter system
摘要： Photovoltaic (PV) systems show nonlinear current–voltage characteristics that depend on both the temperature and the level of solar radiation. Impedance matching is required to achieve the optimal power transfer from such nonlinear PV systems under various temperatures and solar intensities. An efficient analysis method is proposed herein to obtain the characteristics of the PV panel and to simulate the whole system consisting of a PV panel and a converter. The aim is to enable large-signal analysis of an integrated photovoltaic module–converter system based on impedance matching. The Newton–Raphson method is used to obtain the solution of the nonlinear system of equations corresponding to a discrete equivalent circuit model. Various characteristics of the PV system and the simulation results for the whole system are obtained from the resulting linearized model.
关键词： Large-signal analysis,Impedance matching,Photovoltaic system,Converter
更新于2025-09-23 15:21:01
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Multi Input Converter for Reliable and Efficient Harvesting of Solar Energy
摘要： In this paper, a Multi-input converter (MIC) based module level approach for harvesting maximum power in a photovoltaic (PV) system during partial shading is proposed. The MIC topology has a dedicated switch in series with each module to operate it at its maximum power point (MPP). Each module is independent of the other and achieves their respective MPP’s under respective operating conditions. The MIC topology can also withstand open circuit and module mismatch conditions. The proposed system offers simplicity in design, flexibility in control and reliability in operation with low component count (number of switches and passive elements) consequently reduces the size, cost, and complexity of the system. The complete system is comprehensively analyzed for a standalone system under randomly selected conditions and is validated both by simulation studies in MATLAB environment and exhaustive experimental studies on a laboratory prototype.
关键词： partial shading,module level approach,Multi-input converter,photovoltaic system,maximum power point tracking
更新于2025-09-23 15:21:01
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[IEEE 2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC) - Mysore (2017.9.8-2017.9.9)] 2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC) - Development, Testing and Performance Analysis of SPV Powered 0.5HP AC Water Pumping System
摘要： This paper presents the implementation and testing of SPV powered 0.5HP AC water pumping system. DC pumps are widely used in SPV based systems. However, the cost employed for DC pumps is much larger in comparison to conventional AC pumps. In the proposed system inverter is designed for 400 W SPV panel connected to 0.5HP pump. The experimental setup is in Energy Park, Basaveshwar Engineering College built (Autonomous), Bagalkot, India. Further, performance analysis of the SPV water pump under varying conditions of solar radiation is carried out. Solar radiation, SPV output, Inverter output, Inverter efficiency, Flowrate from pump, Hydraulic power output and Pump efficiency are experimentally obtained and tabulated. Performance results revealed that, proposed model delivers 45-50 liters of water per minute from the depth of 3m water tank. Maximum efficiency of inverter and entire unit is obtained at highest solar radiation of 1195W/m2. The results indicate the efficient working of the implemented system for at least 4 hrs, between 11:00am to 3:00pm of a day. The proposed the cost and decreases dependency on conventional energy sources, while satisfying the water requirement in small scale agriculture and gardening.
关键词： Inverter,Radiation,Solar photovoltaic system,Hydraulic Head,Centrifugal pump
更新于2025-09-23 15:21:01
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Effects of bluff-body on the thermal performance of micro thermophotovoltaic system based on porous media combustion
摘要： To improve thermophotovoltaic system efficiency, a porous media combustor with a bluff-body as the flame holder was proposed. A two-dimensional numerical simulation of premixed hydrogen/air combustion inside a planar porous media channel with the local thermal non-equilibrium model was conducted. Effects of the bluff-body flame holder on mean wall temperature and system efficiency were examined. By inserting the bluff-body, the blowout limits of the planar porous media combustor for ? = 0.6, 0.8, 1.0, 1.2 are increased by 33%, 19%, 12%, 20%, respectively. Numerical results show that the flame stabilization is dominated by flow and heat recirculation. Further analysis reveals the mechanism of heat transfer on flame stabilization due to three heat recirculation paths. Considering the view factor and the external quantum efficiency, the system efficiency with the bluff-body is increased by 14.72% as compared to the one without the bluff-body at ? = 0.8, vin = 4 m/s.
关键词： Wall temperature,Bluff-body,System efficiency,Micro thermo-photovoltaic system,Porous media combustion,Heat recirculation
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) - Santos, Brazil (2019.12.1-2019.12.4)] 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference (COBEP/SPEC) - A Curve Tracer for Photovoltaic Modules Based on The Capacitive Load Method
摘要： This work presents the development of a current versus voltage (I-V) curve tracer of photovoltaic (PV) modules based on the capacitive load method, being this an important approach for checking the integrity of PV devices and also the extraction of intrinsic parameters for modeling purposes. The tracer employs a microcontroller to manipulate the data required from current and voltage sensors associated with the module output quantities. For comparison purposes, three different values of capacitance are used to trace the I-V characteristic of a 5-Wp module, as it is possible to verify that the capacitor charging time has direct influence on the number of acquired points that constitute the curve.
关键词： photovoltaic solar energy,photovoltaic system modeling,curve tracer,capacitive load method
更新于2025-09-23 15:19:57