- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 IEEE 3rd International Conference on Cloud Computing and Internet of Things (CCIOT) - Dalian, China (2018.10.20-2018.10.21)] 2018 IEEE 3rd International Conference on Cloud Computing and Internet of Things (CCIOT) - Maximum Power Point Tracking Algorithm for Laser Power Beaming Based on Neural Networks
摘要： With the high voltage intelligent substation developing at a pretty high speed, more and more artificial intelligent techniques have been incorporated into the power devices to meet the automation needs. For the sake of the line maintenance staff's safety, the high voltage isolating switch draws great attention among the most important power devices because of its capability of connecting and disconnecting the high voltage circuit. However, due to high-voltage isolating switch's working environment, the power supply system of the surveillance devices could suffer from great electromagnetic interference. Laser power beaming exhibits its merits in such situation because it can provide steady power from a distance despite the day or the night. Then the energy conversion efficiency arises as a new concern. To make full use of the laser power, this paper mainly focuses on extracting the maximum power from the photovoltaic (PV) panel. And a neural network based algorithm is proposed which combines both the intrinsic and the extrinsic features of the PV panel with the proportion of the voltage of the maximum power point (MPP) to the open circuit voltage of the PV panel. Simulations and experiments are carried out to verify the validness and feasibility of the algorithm.
关键词： laser power beaming,maximum power point,neural network,photovoltaic panel
更新于2025-09-23 15:21:01
-
Improving the performance and economic analysis of photovoltaic panel using copper tubular-rectangular ducted heat exchanger
摘要： This research empirically and theoretically assessed the performance of a solar photovoltaic (PV) panel in five different cooling configurations under the weather conditions of Sanandaj, Iran in September 2018. The findings indicated that, compared to the simple PV mode, the increased mean electrical efficiencies over the whole experiment were 0.27%, 0.5%, 0.72%, 0.6, and 0.88% for the PV/w-XP, PV/w-XD, PV/w-2XDP, PV/a ,and PV/b-2XDP modes, respectively. Further, the highest electrical power for the PV/w-XP, PV/w-XD, PV/w-2XDP, PV/a, and PV/b-2XDP modes increased by 6.8, 12.17, 16.83, 13.17, and 18.92%, respectively compared to the simple PV mode. The monthly electrical output energy the PV/S, PV/w-XP, PV/w-XD, PV/w-2XDP, PV/a, and PV/b-2XDP modes were 28.24 kWh/A, 29.16 kWh/A, 30.34 kWh/A, 31.81 kWh/A, 31.15 kWh/A, and 32.9 kWh/A, respectively. Then, an economic analysis was carried out for the system with two adjustment coefficients. The results showed that although the payback period with an interest rate and an adjustment coefficient of 10% was 2.72 years longer in the PV/b-2XDP than in the PV/S, the annual worth over 20 years was State USD 3.32 (SANA USD 1.07) higher in the PV/b-2XDP mode than in the PV/S mode by considering merely the electrical section. Hence, considering the outlet hot water and air, PV/b-2XDP is more economical to use.
关键词： Water tubular and channel heat exchanger,Photovoltaic panel,Payback period,Thermoelectric
更新于2025-09-23 15:21:01
-
[IEEE 2019 8th International Conference on Renewable Energy Research and Applications (ICRERA) - Brasov, Romania (2019.11.3-2019.11.6)] 2019 8th International Conference on Renewable Energy Research and Applications (ICRERA) - Estimation of Photovoltaic Panel Parameters by a Numerical Heuristic Searching Algorithm
摘要： This work uses the Nelder-Mead approach, which is a direct search optimization method, to obtain the accurate photovoltaic parameters by minimizing a predetermined objective function of five variables. This paper presents some new modifications made to the Nelder-Mead algorithm which allow a better convergence of the method. A comparison study has conducted between this proposed technique and a classical Nelder-Mead algorithm towards the additive noise of the current along with a sensitivity analysis towards the resolution of ADC.
关键词： parameter extraction,Photovoltaic panel,Nelder-Mead algorithm
更新于2025-09-23 15:21:01
-
Simple and Low-Cost Photovoltaic Module Emulator
摘要： The design and testing phase of photovoltaic (PV) power systems requires time-consuming and expensive field-testing activities for the proper operational evaluation of maximum power point trackers (MPPT), battery chargers, DC/AC inverters. Instead, the use of a PV source emulator that accurately reproduces the electrical characteristic of a PV panel or array is highly desirable for in-lab testing and rapid prototyping. In this paper, we present the development of a low-cost microcontroller-based PV source emulator, which allows testing the static and dynamic performance of PV systems considering different PV module types and variable operating and environmental conditions. The novelty of the simple design adopted resides in using a low-cost current generator and a single MOSFET converter to reproduce, from a fixed current source, the exact amount of current predicted by the PV model for the actual load conditions. The I–V characteristic is calculated in real-time using a single diode exponential model under variable and user-selectable operating conditions. The proposed method has the advantage of reducing noise from high-frequency switching, reducing or eliminating ripple and the demand for output filters, and it does not require expensive DC Power source, providing high accuracy results. The fast response of the system allows the testing of very fast MPPTs algorithms, thus overcoming the main limitations of state-of-art PV source emulators that are unable to respond to the quick variation of the load. Experimental results carried on a hardware prototype of the proposed PV source emulator are reported to validate the concept. As a whole result, an average error of ±1% in the reproduction of PV module I–V characteristics have been obtained and reported.
关键词： photovoltaic emulator,single diode model,MPPT,photovoltaic panel
更新于2025-09-23 15:19:57
-
Photovoltaic panels as shading resources for livestock
摘要： Based on our search, we believe that this is the first paper to evaluate the use of photovoltaic panels as shade resources for livestock. Photovoltaic panels can provide artificial shades to protect livestock against intense solar radiation while serving as a clean energy source, reducing CO2 emission, and providing an additional source of income to farmers. These benefits foster sustainable livestock farming practices. In this study, we (1) determined livestock shade preference for photovoltaic panels and the classical 80%-blockage cloth material, and (2) quantified the reduction in radiant heat load provided by these shade structures. To determine the shade preference, the behavior of five Corriedale lambs and six Corriedale ewes were observed in a paddock with two shade structures (one with photovoltaic panels and another with an 80%-blockage cloth). The following behavioral activities were determined using the instantaneous scan sampling method each 10-min from 07:00h to 17:00h: grazing, ruminating, idling, lying, standing, under the sun, under the shade from photovoltaic panels, and under the shade from cloth. To correlate animal behavior with environmental conditions and to quantify the reduction in radiant heat load provided by these shade structures, the following meteorological variables were recorded: solar radiation (total and short-wave), air temperature, relative humidity, wind speed, and black-globe temperature (in the shades and in the sun). We observed that the animals spent less than 1% of their time under the shade from cloth compared to 38% under the shade from photovoltaic panels and 61% exposed to the sun. Sheep preference for shade projected by photovoltaic panels might be explained by the reduced radiant heat load (approximately lower by 40 W m-2) compared to that from the cloth. When the intensity of solar radiation increased from 250 to 850 W m-2, the time the animals spent outside the shades decreased from 96.7 ± 3.6 % to 30.2 ± 6.3 %, which was coupled with a similar increase in the time spent in the shade from photovoltaic panels (from 13.0 ± 3.3 % to 69.3 ± 6.2 %). For the same increase in solar radiation, the energy generated (integrated over 5-min) by the photovoltaic panels increased from 38.8 ± 5.9 to 197.9 ± 3.8 kWh. Over a period of one year, an electric energy of 5.19 MWh (monthly average of 432.33 kWh) was generated and 2.77 tons of CO2 were not emitted to the atmosphere. In economic terms, the electric energy generated in one year was equivalent to a saving of $740.
关键词： photovoltaic panel,tropical conditions,livestock,shade,solar irradiance
更新于2025-09-23 15:19:57
-
Enhanced Power Output from the PV with Low Input Ripple DC-DC Converter
摘要： The primary objective of Maximum Power Point Tracking (MPPT) for PV systems connected to a low-voltage DC grid is to extract the maximum possible power output from the PV array. Normally high-frequency switched mode power converters are employed to track the maximum power. These converters, however, impose switching frequency voltage ripple on the PV output. This causes fluctuation around the Maximum Power Point (MPP) and results in power loss. These losses can be reduced using electrolytic capacitors, however, the electrolytic capacitors’ lifespan is relatively shorter than that of a PV panel. In this paper, an interleaved boost converter is used to reduce high-frequency voltage ripple introduced on panel. Hence, smaller values of longer lifespan capacitors such as film capacitors will be sufficient to curtail the smaller ripple. Moreover, film capacitors are selected based on voltage ripple. Analysis was carried out for calculating voltage ripple imposed on PV module to select input filter more precisely. In addition, reduction in the voltage ripple is calculated quantitatively and is compared with that of a conventional boost converter. Enhanced power output from the PV panel is mathematically proven and experimentally demonstrated.
关键词： photovoltaic panel,switching frequency voltage ripple,PV output power,electrolytic capacitors,film capacitor,maximum power point tracking (MPPT),interleaved boost converter (IBC),low-voltage dc grid,DC-DC converter,photovoltaic (PV) system
更新于2025-09-19 17:15:36
-
Optimization of the areas of solar collectors and photovoltaic panels in liquid desiccant air-conditioning systems using solar energy in isolated low-latitude islands
摘要： The climate conditions of high temperature and humidity in isolated low-latitude islands lead to high energy consumption of air-conditioning throughout the year. Since the area of island is limited and the supply of conventional energy is difficult, the solar radiation acts as an excellent energy resource for solar air-conditioning. Therefore, an important challenge is to optimize the ratio of the area of the solar collectors and photovoltaic panels to ensure the indoor air is maintained within a comfortable range. In this work, a solar-powered liquid desiccant air-conditioning system is considered as a suitable system, and the working principle of the air-conditioning system and the physico-mathematical models of the subsystems were determined. The energy consumption of the proposed system was compared with that of a conventional cooling dehumidification system under different fresh air loads and heat to humidity load ratios. When the installed area is limited, the ratio of the areas of the collector to photovoltaic panel under different load conditions is optimized. Furthermore, the influence of indoor air design parameters on the required installed area of the system was analyzed. The results provide a basis for the application of solar-powered liquid desiccant air-conditioning system in isolated low-latitude islands.
关键词： Intense solar radiation,Photovoltaic panel area,Solar-powered liquid desiccant air-conditioning systems,Solar collector area,High temperature,High humidity
更新于2025-09-19 17:13:59
-
Effect of dust concentration, wind speed, and relative humidity on the performance of photovoltaic panels in Tehran
摘要： Impact of dust concentration and weather conditions – wind speed and relative humidity – on power generation of photovoltaic (PV) panels investigated experimentally in Tehran, Iran, for the period of April 10–September 22, 2018. Two Photovoltaic panels together with data-logging equipment were applied in this experiment. One panel was cleaned every day, while the other was remained unclean after 45 days. A performance ratio called “cleanness index” (CI) which is a temperature-corrected performance ratio of a soiled PV panel to that of a clean one was also used to indicate the dust deposition effect on PV panel performance. The uncertainty range of experimental results was between 5.27% and 5.55%. The results show that cleanness index had positive correlation with wind speed and negative correlations with relative humidity and dust concentration. Thus, in comparison to the clean PV panel, the output-power of the soiled panel reduced, approximately 8–12% per month. Furthermore, in order to numerically predict daily change of cleanness index (ΔCIPre), a linear regression model was developed and the outcome revealed that dust concentration had the most impact, with 21.56%.
关键词： cleanness index,dust deposition,weather condition,Photovoltaic panel,performance loss
更新于2025-09-19 17:13:59
-
Hybrid Photovoltaic and Solar Thermal Systems (PVT): Performance Simulation and Experimental Validation
摘要： Continuous Solar irradiation on the photovoltaic panel causes its temperature to increase, resulting in reduced efficiency. The present paper focuses on improving the efficiency of the photovoltaic panel through the use of hybrid Photovoltaic-Thermal (PVT) system. Water is used as the coolant in the cooling channel, flowing through the copper tubing provided below the photovoltaic panel, where the temperature is maximum. The thermal energy extracted in the process can be harnessed in several ways, improving the overall efficiency of the system. A theoretical model was prepared using COMSOL? multi-physics. The results achieved in the experimental set-up are quantified. As per the experimentation carried on the photovoltaic panel, an average temperature of 303.38 K at Standard Test Condition (STC) was achieved through cooling, while the temperature of the panel without cooling rose up to 333.15 K in environmental conditions, thus, improving the efficiency of the photovoltaic panel. The paper later applies the idea to an entire solar power plant to improve the overall efficiency of the power plant, by cooling the photovoltaic panel as well as generate hot water as its by-product.
关键词： Hybrid photovoltaic-thermal (PVT) systems,Hybrid model,Photovoltaic panel
更新于2025-09-16 10:30:52
-
Impact of Nonplanar Panels on Photovoltaic Power Generation in the Case of Vehicles
摘要： We investigate the impact of nonplanar panels on power generation in the case of photovoltaic panels mounted on vehicles. The power generation of nonplanar photovoltaic panels on vehicles is analyzed using the numerical geometric model, comprising the incident angle distribution of irradiation. We calculated power generated by the photovoltaic panels equipped on the roof, side, and tilted surfaces of vehicles, showing that even the panels on the side, which are ?tted vertically to the ground, generate more than a quarter of the total power as that generated by the panel horizontal to the ground. Furthermore, we evaluated the curve correction factor that re?ects the relative power generation of nonplanar panels with respect to the reference ?at panels on vehicles. The geometrical model reproduces a simple relationship between the curve correction factor and effective surface ratio between the nonplanar and reference ?at panels. Our ?ndings indicate that the curve correction factor is useful to estimate power generation for nonplanar photovoltaic devices on vehicles; this provides a guiding principle for designing nonplanar photovoltaic devices for vehicles.
关键词： Curve correction factor,photovoltaic panel,photovoltaic system,vehicles
更新于2025-09-16 10:30:52