- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2019
- 2018
- 2014
- solar cell
- hybrid-resonant PWM switching
- PWM switching
- MPPT
- resonant converter
- solar power
- Geostationary satellite images
- Global and direct solar radiation
- Meteorological station
- validation
- Electrical Engineering and Automation
- New Energy Science and Engineering
- Optoelectronic Information Science and Engineering
- Optoelectronic Information Materials and Devices
- Applied Physics
- National technical University “Kharkiv Polytechnic Institute”
- University of évora
- Fraunhofer Institute for Solar Energy Systems ISE
- University of Tunis El Manar
- Zeal College of Engineering and Research
- Northern (Arctic) Federal University named after M.V. Lomonosov
- Cochin University College of Engineering
- National Renewable Energy Laboratory
- NED University
- Universidad Veracruzana
-
Thermal and electrical conductivity enhancement of solar glycol-water mixture containing MWCNTs
摘要： In this investigation, the authors describe the thermal conductivity, and electrical conductivity of solar glycol - water (50:50) mixture with MWCNTs. Gum Arabic was used as the surfactant to prepare a stable nanofluid suspension. The MWCNTs are dispersing with different volume concentrations of 0.2%, 0.4% and 0.6% prepared via a typical two-step methodology. The colloidal stability assessments were conducted through UV-vis spectrometer, zeta potential analyser, scanning electron microscopy analysis and pH metre. The maximum augmentation of thermal conductivity attained is (cid:1)21.46% at a loading of 0.6 vol.% of MWCNTs in SG - water mixture at 50(cid:3)C. However, the electrical conductivity of the prepared nanofluid linearly enhanced with increasing temperature. The electrical conductivity enhancements of (cid:1)62.19% at a loading of 0.6 vol.% of MWCNTs in SG – water mixture at 50?C. Results confirm that the SG-Water and MWCNTs based nanofluids can be used as a right replacement for the conventional liquids in various heat transfer applications.
关键词： Solar glycol,Thermal conductivity,Multiwalled carbon nanotubes,pH,Electrical conductivity
更新于2025-09-04 15:30:14
-
New approach for maximizing generation and optimal utilization of available space for solar PV system
摘要： To accomplish an enormous demand of power with solar energy, a cost effective and optimum system has to be developed which works in synchronisation with the existing grid. The Government in developing countries like India is providing momentous opportunities and marvellous schemes to promote renewable energy sources like solar for generating power. This paper aims to analyse the generation of power from solar photovoltaic (PV) systems economically and efficiently as it is always a challenge for the design engineer to develop an economical and efficient solar PV system. Apart from technical issues, structural aspects also affect the power generation from PV modules. This paper proposes an innovative design of non-movable tracking system that enhances the power generation of PV modules by just providing two grooves in the mounting structure in place of the tracking system. A formula for the optimum space calculation for PV installation is also proposed in this paper. A comparative analysis of total annual energy generated by the hardware setup and the results obtained using software of the rooftop solar PV system has also been analysed for practical consideration. To verify the results, first, the system has been simulated using the PVSYST software considering all practical and existing realistic losses like PV loss due to irradiance and temperature, array soil loss, module quality loss, array mismatch loss, ohmic wiring loss, and inverter loss which formulate a bonafide case of consideration and then hardware implementation of the proposed system. The hardware and software results have been compared to analyse the proposed topologies adopted to address the aforesaid problems.
关键词： grid connected PV system,optimum module placement,solar PV system,PVSYST software,module tilt angle
更新于2025-09-04 15:30:14
-
Experimental investigation on Heat Distortion Temperature parameter of Polymer Matrix Composites for solar Panel Applications
摘要： In this paper the examination intended to create polymer matrix composites with polyester and vinyl ester better warmth opposition. The glass fiber with polyester favoured with various piece of composite with expansion of various fillers in various weight parts was created. Created utilizing vacuum sack shaping procedure. The mechanical properties were assessed utilizing Universal testing machine and the warmth mutilation temperature is the temperature at which a polymer or plastic example disfigures under a predetermined load. This property of a given plastic material is connected in numerous parts of mechanical assembly with various loads. Better mechanical properties and wear properties were gotten with increment in weight level of auxiliary fortification substance. The Heat Distortion Temperature is controlled by the test strategy delineated in ASTM D648.Further it was discovered that The extent 40:60 and 20:80 does not framed as flawless IPN consequently it is discovered that 80% vinyl ester and 20%poyurethane have great flexibility and sturdiness in correlation with different proportions.
关键词： Tribology,and solar panel,Polymer matrix composite,Heat distortion
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - A High-Performance Cost-Effective Resonant Converter with a Wide Input Range in Solar Power Applications
摘要： In this paper, a novel hybrid-resonant PWM switching scheme is presented for an isolated high-performance and cost-effective LLC multi-resonant dc-dc converter with an output voltage-doubler in solar power applications. The new hybrid-resonant PWM switching scheme enables a resonant converter topology to achieve very high energy efficiency over a wide range of input line and load. The proposed control scheme not only maximized the efficiency, but also simplifies the implementation of MPPT in resonant converters. Finally, using SiC wide-band gap semiconductor technology will make it possible to operate these devices and the electronic board in an elevated temperate, thus achieving higher reliability and required life time. Experimental results are presented for a prototype unit converting input voltage range of 17 V to 48 V dc from a solar panel to an output voltage of 400 V dc at 250 W. The prototype achieves a peak efficiency of 98.5 %.
关键词： hybrid-resonant PWM switching,PWM switching,MPPT,resonant converter,solar power
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE 7th International Conference on Photonics (ICP) - Kuah (2018.4.9-2018.4.11)] 2018 IEEE 7th International Conference on Photonics (ICP) - Simulating the Annual Energy Yield of a Rotationally Asymmetrical Optical Concentrator
摘要： This paper simulates the annual energy yield of a concentrator called the rotationally asymmetrical dielectric totally internally reflective concentrator (RADTIRC). One specific design of the RADTIRC is assumed to be installed in Berlin/Brandenburg, Germany. Simulation and experimental work have been carried out to determine the optical concentration gain under direct and diffuse radiations. Based on the analysis, it was found that the yearly energy yield was increased by a factor of 2.29 when the RADTIRC-PV module was used when compared with the non-concentrating PV module.
关键词： annual output,Berlin,solar photovoltaic,rotationally asymmetrical dielectric totally internally reflecting concentrator,building integrated photovoltaic systems
更新于2025-09-04 15:30:14
-
[IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Implementation of Standalone PV Micro Grid with Multi-level converters for Rural Electrification
摘要： The present paper deals with a standalone micro grid for rural electrification with multilevel converters powered by PV energy solar, with large range of solar irradiance. For countries of Sub-Saharan Africa, the developed systems must have aspects of robustness, reliability, very low maintenance and affordable costs. So, the use of multilevel converter in low and medium voltage can satisfy these criteria according to the following conditions: good voltage withstand and low losses for the power switches, low total harmonic distortion of output voltage. These properties allow optimally sizing PV solar panels, battery banks, passive elements for filters, and electrical features of power components.
关键词： Multilevel Converter,Passive Filter,PV Solar,Total Harmonic Distortion,Battery,PI Controllers
更新于2025-09-04 15:30:14
-
Laboratory precision measurements of optical emissions from coronal iron
摘要： Total solar eclipses, as the recent one seen across North America, are rare opportunities for optical spectroscopy of the corona. In view of the dearth of accurate rest-frame wavelength data, we measured 11 of the strongest optical coronal lines belonging to Fe X-XIV thereby proving the existence of the Fe XII line at 290.385(8) nm. Four lines, such as the green coronal line at 530.28113(13) nm, were measured with unprecedented precision, allowing in principle for absolute velocity determinations of plasmas with uncertainties of 0.08 km s?1. These results furthermore stringently benchmark the theory of complex open-3p-shell ions.
关键词： solar eclipses,coronal iron,optical emissions,spectroscopy,precision measurements
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - A New Five-Level Inverter Topology with Voltage Controller for Grid-Connected PV System
摘要： Photovoltaic (PV) systems are growing in demand due to the recent drop in prices of the solid state components. However, the quality of the output of the PV systems are still lacking behind and this is a major problem while connecting the system to the grid. Inverters being the brains of a solar PV system need to be made smarter and better. Multi-level inverters are one of the most popular types of inverters for grid-connected PV systems due to the higher quality output they can produce than other inverters. One of the key features they provide is the minimization of total harmonic distortion (THD) and electromagnetic interference which tackles leakage current issue. So, in this paper a new five-level inverter topology for grid-tie PV is proposed which is controlled using a new voltage controller that ensures higher efficiency while enhancing the stability of the system. The suggested closed loop voltage controller method additionally provides the ability to provide constant or adjustable voltage to the grid. In this proposed topology the voltage controller enables the PV system to provide high quality power to the grid which is vastly important. To validate the accuracy of the theoretical analysis, the control technique was applied to the existing multi-level inverter topology and then has been simulated in MATLAB/Simulink software. Moreover the five-level output provides a much better output and better PF then other existing topologies.
关键词： closed loop system,total harmonic distortion (THD),Solar photovoltaic (PV) system,multi-level inverter,sinusoidal pulse width modulation (SPWM),voltage controller
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Kota Kinabalu, Malaysia (2018.10.7-2018.10.10)] 2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) - Automated Planning of Rooftop PV Systems with Aerial Image Processing
摘要： The increasing prevalence of photovoltaic (PV) panels for microgrid and off-grid energy applications makes affordable PV planning an important issue. Since recording rooftop area and dimensions traditionally required on-site measurements, the process was expensive, slow, and hard to scale. This research develops software that uses image processing for roof detection. Satellite images feed into the software, which estimates the rooftop area receiving solar exposure in that area as well as the number of individual buildings receiving solar exposure. In this way, entire villages can be analyzed automatically, and PV installations planned from afar, rather than requiring a human taking measurements of each building from the ground. This research further develops a GUI to accomplish this rooftop classification for users around the globe, making this capability available even to parties with low resources who would benefit from access to electricity. In this way, the study makes planning PV systems feasible and affordable for many scales of installation, from a single home to a city of numerous assorted buildings.
关键词： demand forecasting,solar panels,object detection,photovoltaic systems,microgrids
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Portland, OR, USA (2018.9.23-2018.9.27)] 2018 IEEE Energy Conversion Congress and Exposition (ECCE) - Passive Filter Design to Mitigate Dead-Time Effects in Three-Level T-Type NPC Transformerless PV Inverters Modulated with Zero CMV PWM
摘要： Common-mode voltage (CMV) can cause common-mode (CM) current in transformerless PV inverters. In practice, large CM choke is usually required to suppress the CM current. Alternatively, zero common-mode voltage (ZCMV) modulation can be applied to eliminate the CMV. But in practical applications, CMV spikes are inevitable due to the dead-time effect. Such dead-time effect can be mitigated by special PWM sequence design, however, at the expense of increasing switching losses. In this paper, our study addresses this issue by using the DC neutral-point connected LCL (NC-LCL) filter. As the differential-mode (DM) output quality is undermined with ZCMV PWM, the LCL filter parameters must be carefully designed, where both CM and DM filters need to be considered. In addition, filter design for conventional phase disposition (PD) modulation is also included as a comparison. Both simulation results and experimental results are provided for verification.
关键词： Photovoltaic (PV) solar inverter,LCL filter design,Phase disposition modulation,T-type 3L-NPC (PD) inverter,Zero CMV modulation
更新于2025-09-04 15:30:14