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Theoretical model of absorption coefficient of an inhomogeneous MPP absorber with multi-cavity depths
摘要： Micro-perforated panel (MPP) absorber has been known as an alternative absorber to classical porous material given its facile installation, long durability, environmental friendliness and attractive appearance. Extensive studies of MPP absorber proposing the improvement of its absorption frequency bandwidth have been published. This study presents a MPP absorber introduced with inhomogeneous perforations and with multi-cavity depths. The MPP is divided into two sub-area, where each area has different hole diameter, perforation ratio and a separated backed cavity depth. The acoustic impedance is modelled using electrical equivalent circuit and the absorption coefficient is calculated under normal-incidence of sound. It is found that the inhomogeneous MPP can have good bandwidth of absorption by designing the sub-MPP of smaller perforation ratio with large hole diameter and the one having the larger perforation ratio with smaller hole diameter. The absorption bandwidth can be conveniently controlled by adjusting the cavity depth of each sub-MPP. The results from the experimental work show good agreement with the theoretical model.
关键词： Micro-perforated panel,Inhomogeneous MPP,Absorption coefficient,Acoustics
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE Power & Energy Society General Meeting (PESGM) - Portland, OR, USA (2018.8.5-2018.8.10)] 2018 IEEE Power & Energy Society General Meeting (PESGM) - An advanced maximum power point capturing technique with supercapacitor for PV system
摘要： In this paper, the characteristic curves considering complete Current-Voltage (I-V) and Power-Voltage (P-V) relations for PV system are presented. Based on the I-V characteristic curve, a novel Maximum Power Point Capturing (MPPC) technique is proposed to overcome the steady-state oscillation and slow dynamic response problems existing in the conventional Maximum Power Point Tracking (MPPT) technique. In order to further mitigate the fluctuations for PV system, an appropriate supercapacitor (superC) is selected to be connected in parallel with the PV system. The simulation results demonstrate the designed MPPC-superC structure has a better performance than the conventional MPPT method and MPPC method in both steady-state and dynamic responses.
关键词： supercapacitor,MPPC,MPP,PV system
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Implementation of Differential Power Processing to Optimize the Solar Power Generation
摘要： The objective of this paper is to harvest the optimum power from solar panel using different MPPT techniques for low power application under non-uniform irradiance conditions. The overall power output of photovoltaic system is reduced due to partial shading. A new differential power converter along with INC control algorithm is introduced to reduce the partial shading effect and oscillations of output power.
关键词： Differential power processing,Maximum Power Point Tracking (MPPT) techniques,Photo-Voltaic (PV) array,Maximum Power Point (MPP),Partial Shading Condition (PSC)
更新于2025-09-23 15:22:29
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Mathematical Modelling of Solar Photovoltaic Cell/Panel/Array based on the Physical Parameters from the Manufacturera??s Datasheet
摘要： This paper discusses a modified V-I relationship for the solar photovoltaic (PV) single diode based equivalent model. The model is derived from an equivalent circuit of the PV cell. A PV cell is used to convert the solar incident light to electrical energy. The PV module is derived from the group of series connected PV cells and PV array, or PV string is formed by connecting the group of series and parallel connected PV panels. The model proposed in this paper is applicable for both series and parallel connected PV string/array systems. Initially, the V-I characteristics are derived for a single PV cell, and finally, it is extended to the PV panel and, to string/array. The solar PV cell model is derived based on five parameters model which requires the data’s from the manufacturer’s data sheet. The derived PV model is precisely forecasting the P-V characteristics, V-I characteristics, open circuit voltage, short circuit current and maximum power point (MPP) for the various temperature and solar irradiation conditions. The model in this paper forecasts the required data for both polycrystalline silicon and monocrystalline silicon panels. This PV model is suitable for the PV system of any capacity. The proposed model is simulated using Matlab/Simulink for various PV array configurations, and finally, the derived model is examined in partial shading condition under the various environmental conditions to find the optimal configuration. The PV model proposed in this paper can achieve 99.5% accuracy in producing maximum output power as similar to manufacturers datasheet. ?2020. CBIORE-IJRED. All rights reserved
关键词： Partial shading,MPP,PV cell,I-V characteristics,P-V characteristics,Forecasting
更新于2025-09-23 15:19:57
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[IEEE 2019 14th International Conference on Computer Engineering and Systems (ICCES) - Cairo, Egypt (2019.12.17-2019.12.17)] 2019 14th International Conference on Computer Engineering and Systems (ICCES) - Analog Control Algorithm-Based a Photovoltaic Energy Harvesting System for Low-Power Medical Applications
摘要： One of the attractive solutions used for supplying low-power medical applications is the photovoltaic (PV) energy harvesting system. In this paper, the proposed PV energy harvesting system is composed of a photovoltaic panel, a DC-DC boost converter, a fixed resistive load and an analog control algorithm. This algorithm is designed based on the output load current. The algorithm is implemented using the multisim program. This algorithm is simple, efficient, low cost and low power consumption because it measures only the output current parameter and does not need multipliers. The power consumption of the proposed load is approximately 39.24 mW. Therefore, the expected working duration of the load is 20.9 hours under continuously operation of the light for 4 hours. Finally, the simulation results illustrate the transient characteristics of the proposed PV system.
关键词： Medical wearable sensor nodes,Energy harvesting,Multisim,Photovoltaic,Maximum power point (MPP)
更新于2025-09-23 15:19:57
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Modified variable step incremental-conductance MPPT technique for photovoltaic system
摘要： Maximum power point (MPP) Tracking, which is usually referred as MPPT, is a setup that forces the photovoltaic (PV) module to operate in such a way that the PV module will yield the maximum power, which in turn depend upon the solar illumination and surrounding temperature. Amidst all the MPPT designs, perturb & observe and incremental conductance (INC) algorithms are mostly selected due to easy implementation and good tracking credibility. The conventional MPPTs based on fixed step size give less power output and at every step tracking is required for new location due to random variation is a tedious job. In this paper the variable step size INC-MPPT technique is proposed which automatically tracks the next step size to maximize the power output. The comprehensive comparison is presented using MATLAB/SIMULINK between conventional and improved MPPT.
关键词： Maximum power point tracking (MPPT),Variable step size INC,Maximum power point (MPP),Photovoltaic (PV),Incremental-conductance (INC)
更新于2025-09-23 15:19:57
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Efficient predictive models for characterization of photovoltaic module performance
摘要： This paper presents simple, e?cient and general mathematical models for predicting the I-V characteristics of any Photovoltaic (PV) module at any irradiance and temperature values without any need to estimate the parameters of the PV circuit model. The prediction of the I-V characteristics in this paper is mainly dependent on building general mathematical models for ten key points selected from the I-V characteristics. To generalize these models and make them applicable for any PV module, twenty di?erent PV modules covering a wide range of PV modules with di?erent temperature and irradiance values are selected for training data generation. All simulations are performed in MATLAB/SIMULINK. The training process and models development are built using EUREQA software. The performance of the developed models is tested by comparison with simulation data, experimental data, and di?erent recent research articles. The assessments have shown e?cient prediction capability of all models to predict the I-V curves for any PV module, at any weather condition, without evaluating the PV circuit model parameters. The models have also exceeded various algorithms used in the literature in terms of accuracy of I-V characteristics estimation with less execution time.
关键词： MPP,I-V curve,Mathematical models,PV,EUREQA
更新于2025-09-23 15:19:57
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Investigation of Photovoltaic Output Characteristics with Iterative Methods
摘要： The photovoltaic (PV) cell has been described by non-linear outputs characteristics in current-voltage and power-voltage. This outputs is affected by various effects such as; solar irradiance, temperature, wind and dust. Also, it is depending of the material used in P-N junction and it can vary with ideality factor of P-N junction. The goal of this paper is to describe and to plot the current-voltage and power-voltage under different temperatures, solar irradiance and ideality factor by using iterative method. To carry out this study, we chose the mono crystalline PV module with 60 cells connected in series to provide 255 Watt manufactured by Sunmodule. The obtained results have shown that the electrical output parameters are affected by the nature of the P-N junction. Moreover, at low irradiance, the maximum power point and open circuit voltage depends of semiconductor. At high solar level, the ideality factor variation of P-N junction affects only the maximum power point. Finally, the maximum power point is determined at different solar intensity level and temperature.
关键词： Irradiation,Ideality factor,Iterative methods,Single diode,MPP
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 17th World Symposium on Applied Machine Intelligence and Informatics (SAMI) - Herlany, Slovakia (2019.1.24-2019.1.26)] 2019 IEEE 17th World Symposium on Applied Machine Intelligence and Informatics (SAMI) - Computer Based Model for an Off-Grid Photovoltaic System with no DC – DC Adapter
摘要： This article describes a solar energy system, operating off-grid, having either a single photovoltaic panel - PV, or a group of multiple PVs, grouped in a simple solar battery-SB, directly supplying an electric battery-EB, or a group of EBs, having no DC-DC adapter (a buck, a boost or a combination of them, a classic solution available on the market). That SB must be adjusted to the voltage of the EB, in order to supply the same amount of electric energy as when the system functions at its mathematically detected maximum power operating point, on a MPP command strategy. This newly discussed technical solution could be less expensive, compared to the actual one which involves a SB, a DC-DC converter and the EB. It is a cost reduction because that DC-DC converter is no longer used at all. It requires a computer aided model for implementing the current-voltage characteristics. The results of this model will be compared with the classic DC-DC converter solution results, in order to prove validity.
关键词： Photovoltaic System,Direct Supply,Off-Grid,MPP
更新于2025-09-12 10:27:22
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[IEEE 2019 4th World Conference on Complex Systems (WCCS) - Ouarzazate, Morocco (2019.4.22-2019.4.25)] 2019 4th World Conference on Complex Systems (WCCS) - Implmeneting a Fuzzy Logic Controller to Improve the Performances of an Off-Grid Photovoltaic Generator
摘要： In this work, a power generation system based on a PV module disconnected from the grid has been developed. In which a solar controller MPPT based on the perturbation and observation algorithm is developed using Fuzzy Logic Controllers (Fuzzy Logic Controllers, FLC) approach. The efficiency of this control method is confirmed by simulation under Matlab Simulink.
关键词： MPPT,Fuzzy Logic,MPP,Photovoltaic
更新于2025-09-12 10:27:22