Papers by Keyword: PV Module

Abstract: Effects of shading and blocking of solar radiation intensity through Fresnel lens onto solar cell were investigated in this work. Fresnel lens was made of polyvinyl chloride to concentrate the solar radiation onto the polycrystalline silicon solar cell with the 0.767 m x 0.670 m in size and no cooling under the solar panels. The temperature and efficiency comparisons between solar module with and without Fresnel lens were observed. The performance of the two modules overtime is assessed by monitoring the characteristic I-V and P-V curves. The maximum efficiency of the solar panels with Fresnel lens and without Fresnel lens in each hour was approximately 5-6.7% and 8.8-11.5%, respectively. This lower efficiency of PV module with Fresnel lens was a result of unsuitable distance of Fresnel lens that operated with the PV module.

Abstract: Optimization of the PV array on roof has a great influence on designing of the maximum capacity of PV system. This paper analyses the effect of various factors on the maximum output power of PV array system on roof. Model for optimizing the PV array on the roof have been set up for simulation, and the calculation results show that the number of PV subarray is smaller, and the PV system capacity is larger. And then we can get the general design method for maximum photovoltaic system capacity under given area.

Abstract: This paper researched the power generation characteristics of PV module by a variety of environmental factors through building a simulation model. Based on this module, it analyzed the effect of environmental factors, such as temperature, light intensity, dust deposition and other factors when the PV module operating respectively. Then, author compared the simulation data with the distributed PV system operating data in Shanghai to verify the reliability of the model. On the analysis of these data, this paper deeply researched the PV module output power and the variation of the attenuation characteristics.

Abstract: This paper shows photovoltaic (PV) power generation systems in Nagaoka University of Technology. On the basis of acquired data, installation angle of PV module and effect of sunlight reflection in winter are examined. Consequently, it is cleared that there is the optimum angle for each season, and the reflection against snow is very effective for the PV power generation. The angle usually depends on the latitude of location, but taking account of this effect, suitable installation angle changes. It implies that the optimum angle of all year round has flexibility. Actually, we can get about the same electric power when the angle is between 30 and 60 degrees.

Abstract: The paper presents the thermoelectric coupling model for a photovoltaic (PV) module. Firstly, the five-parameter electrical model and the thermal model of the PV module are investigated. In order to evaluate the effectiveness of the model, the numerical computation and experimental values under certain environmental conditions are compared. The experimental results demonstrate the model has reasonable accuracy. Furthermore, to investigate the PV modules performance under different ambient temperature, irradiance and wind speed, the model is used to simulate the thermoelectric characteristics of the PV module. The simulation results can provide meaningful method to predict power generation of the PV module under various conditions.

Abstract: Existing model of solar cells is not suitable for partial shading condition, which makes output current-voltage (I-V) curve of photovoltaic (PV) array staid-stepping. Furthermore, Power-Voltage (P-V) characteristics may exist more than two local peak value in partially shading which bring interferences to maximum power point tracking (MPPT). Based on modified engineering model of solar cells, an accurate model of array was proposed considering variation of shadows. And the I-V characteristic, P-V characteristic and yield of PV modules were analyzed. At last, the optimum output power with different shadows arrangement was discussed.

Abstract: On the verge of exhausting fossil fuels, solar energy is the one of best options for the primary source of energy as it is renewable, eco-friendly and safe to use. An intelligent solar tracker will attempt to navigate to the best angle of exposure of the sun ensuring that the maximum amount of sunlight strikes the panel throughout the day. The main reason for pursuing this paper is to establish the idea that a tracker aided array of PV modules produces more power over a longer time than a stationary array with the same number of modules.

Abstract: In order to meet the needs of experiments, teaching and training on output characteristics of PV solar panel, this paper designed and produced a real-time training experimental box to test the output characteristics of the PV module, basing on the principle and characteristics of the PV generation .The partial function of the experimental box is designed according to the operational principle of the PV streetlight. So it may be used combining with PV module or PV streetlight. It is a teaching and training tool to carry out appropriate experiments. The photovoltaic output characteristics have been verified by the test results on the equipment.

Abstract: In photovoltaic power systems, both photovoltaic modules and switching-mode converters present nonlinear and time-variant characteristics, which result in a difficult control problem. This paper presents an in-depth analysis and modeling to discover the inherent features of a photovoltaic (PV) power system and proposes a control method for PV power system based on small-signal model. This paper also presents a state equation and transfer function of PV power system and a stable control system for regulating the photovoltaic voltage. Simulation and experiment results demonstrate the effectiveness of the presented analysis, design, and implementation.

Abstract: In this paper a modeling method is investigated that finds the non-linear equation parameters of a photovoltaic (PV) module in order to obtain the desired PV model using any circuit simulator. This modeling method adjusts the I-V curve at three remarkable points: the open circuit voltage, the short circuit current, and the maximum power point [1]. Three models are realized using this technique namely, the single-diode model, the two-diode model, and the three-diode model. The evaluation study of the accuracy of these three models showed relative errors ranging from 32% to 50%. Further, this technique is improved by adjusting the I-V curve at more than three points depending on the number of unknowns to be found for each model, which showed a reduction in the relative error ranging from 0.37% to 38%.