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Hybrid photosensitive structures based on nematic liquid crystals and lithium niobate substrates
摘要： Liquid crystal cells based on lithium niobate substrates have recently been proposed as good candidates for optofluidic devices and for light-induced controlled generation of defects in liquid crystal films. The peculiarity of these structures lies in the possibility of using the bulk photovoltaic effect of lithium niobate to obtain an optically induced dc field able to affect the molecular liquid crystal director. Reversible fragmentation and self-assembling of liquid crystal droplets driven by the lithium niobate pyroelectric properties have also been reported. We review the basic results obtained so far with the aim of making the point and seeing what else can be done in the framework of the realization of hybrid structures combining lithium niobate with the electro-optical and nonlinear optical properties of liquid crystals.
关键词： pyroelectric effect,optofluidic devices,lithium niobate,liquid crystals,photovoltaic effect
更新于2025-09-09 09:28:46
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Synthesis and applications of nano-TiO2: a review
摘要： TiO2-based nanomaterials have attracted prodigious attention as a photocatalysts in numerous fields of applications. In this thematic issue, the mechanism behind the photocatalytic activity of nano-TiO2 as well as the critical properties have been reviewed in details. The synthesis routes and the variables that affect the size and crystallinity of nano-TiO2 have also been discussed in detail. Moreover, a newly emerged class of color TiO2, TiO2 in aerogel form, nanotubes form, doped and undoped form, and other forms of TiO2 have been discussed in details. Photocatalytic and photovoltaic applications and the type of nano-TiO2 that is more suitable for these applications have been discussed in this review.
关键词： Nanocomposites,Photocatalysis,Photovoltaic,Nano-TiO2,DSSC
更新于2025-09-09 09:28:46
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Epitaxial ferroelectric oxide thin films for optical applications
摘要： Ferroelectrics are non-centrosymmetric crystalline materials that possess a spontaneous polarization that can be switched by an electric field. The electric-field-dependent optical response of these materials makes them important for optical devices, such as modulators or beam deflectors. In the inexorable drive to miniaturization, the concept of integrated thin film optical devices has led to the incorporation of ferroelectric thin films on single-crystal substrates. These structures have appealing electro-optic modulation characteristics, interesting strain-dependent bandgaps and refractive index, as well as promising possibilities for solar harvesting. Here, we review the work on epitaxial ferroelectric (FE) films for optical applications. We first show that FE thin film materials are attractive for integrated electro-optic modulators and then show that epitaxial strain can be used to enhance the FE and optical functionality of films. Next, we describe some of the photovoltaic functionality of FE thin film materials’ systems and conclude the review by highlighting some thin-film devices that exploit the aforementioned optical effects.
关键词： epitaxial strain,electro-optic modulators,thin films,photovoltaic,optical applications,ferroelectric
更新于2025-09-09 09:28:46
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[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) - Comprehensive Review on Appropriate Sizing and Optimization Technique of Hybrid PV-Wind System
摘要： The energy consumption is increasing at an alarming rate due to the growth of world population. Hybrid renewable energy system (HRES) is becoming more trending as the sources involved such as wind and solar radiation to generate energy is environmental friendly, renewable and sustainable while cost free. Hybrid renewable energy is more reliable, stable and efficient compared to the single renewable energy. Furthermore, the limitation of energy production using single renewable energy will improve by combining two or more such system to form HRES. Solar and wind energy acts as a compensation for each other and the combination of these two systems will be able to satisfy energy demand to a certain degree. This review paper includes various and appropriate sizing and optimization techniques involved to optimize HRES in order to achieve the energy demand while minimizing the cost required.
关键词： photovoltaic (PV),sizing,Hybrid renewable energy system (HRES),wind,optimization
更新于2025-09-09 09:28:46
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[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) - Modifications to Accelerate the Iterative Algorithm for the Two-diode Model of PV Module
摘要： This work proposes two modifications—namely Adaptive Search Range (ASR) and improved Newton-Raphson Method (iNRM), to enhance the computation speed of the iterative computational method for the two-diode model. These modifications significantly improve the computation speed without introducing any compromise in terms of accuracy. Moreover, they are very simple to implement and do not require any additional information as input. By implementing ASR, the algorithm is only required to calculate a fraction (25%) of the P- V curve at every iteration. On the other hand, the iNRM improves the calculation of the curve by guiding the initial value of current for each point of voltage. To evaluate their effectiveness, the original algorithm and its modified versions are coded in Matlab script. They are used to identify the model parameters of three PV modules of different technologies. The computation time of the algorithm with both ASR and iNRM implemented is observed to be up to 4.7 times faster. Furthermore, the values of the model parameters are computed to be exactly equal—which implies that the accuracy of the original algorithm the is retained. With these merits, the modifications are envisaged to be critical improvements to the algorithm, especially for application in computers with lower specifications.
关键词： photovoltaic,pv modelling,two-diode model,simulation
更新于2025-09-09 09:28:46
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Increasing Energy Capture from Partially Shaded PV String Using Differential Power Processing
摘要： In PV strings based on series-connected PV modules, mismatches among the modules due to partial shading, will cause in power loss either due to series connection constraint or due to bypass diodes. This paper proposes a new distributed MPPT (DMPPT) scheme using multi-winding forward-based converter, acts as a current balancing differential power processing (DPP) converter. The converter is configured in the way that each converter port is connected in parallel with individual PV module to enable module-level maximum power extraction. The proposed architecture operates in two modes: local MPPT mode and current balancing mode. The new MPPs at module-level are tracked in local MPPT mode and then dispatched to start current balancing mode of operation. In the current balancing mode, this paper proposes a simple control approach to maximize output power from partially shaded PV string by maintaining an effective MPPT at module-levels and directly transferring the compensation currents toward the shaded modules from modules under normal conditions without any intermediary. The proposed DMPPT scheme is validated by simulation and experimental results. The results show that using the proposed scheme, the system efficiency is significantly improved compared to other existing topologies.
关键词： distributed maximum power point tracking (DMPPT),partial shading (PS),photovoltaic (PV),differential power processing (DPP)
更新于2025-09-09 09:28:46
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[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) - Improved Matlab Simulink Two-diode Model of PV Module and Method of Fast Large-Scale PV System Simulation
摘要： Nowadays, to response to the demand of a high rate renewable energy penetration in the electricity grids, the installation of many new large-scale photovoltaic systems up to more than 100 MW is unavoidable. However, in many countries, there is a serious lack of space for these large-scale projects. As the authorities wish to avoid taking away many farmlands for ground-mound photovoltaic systems, we must find acceptable ecological alternative solutions. One of the solution is the linear photovoltaic systems due to the availability and ready to use of the linear space: bike path, along the pavement of a road, along the edge of a highway… Another interesting method is the installation of floating PV power plants on inland water bodies. The possibilities and opportunities of these new kinds of large-scale PV plants are infinite. However, their installations meet a lot of challenges, such as the loss due to new structures and environments, the cost of equipment, the compatibility of the new PV plants with the initial function of the surface… To study these challenges, an effective simulation tool is essential. Considering the importance of the simulation tools, this paper proposes an improved PV system simulation model based on the two-diode model and a fast, comprehensive method to simulate the PV system in long term with a huge volume of the MATLAB/SIMULINK in environment.
关键词： PV module database,Large-scale photovoltaic system,Module modelisation,Photovoltaic (PV),Matlab/Simulink
更新于2025-09-04 15:30:14
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[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
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Nanoscale engineering of photoelectron processes in quantum well and dot structures for sensing and energy conversion
摘要： Advanced selective doping provides effective tool for nanoscale engineering of potential barriers and photoelectron processes in quantum well (QW) and quantum dot (QD) optoelectronic nanomaterials for IR sensing and wide band photovoltaic conversion. Photoelectron kinetics and device characteristics are theoretically and experimentally investigated. Asymmetrical doping of QWs is employed in a double QW structure for tuning electron transitions in QWs by voltage bias. These QW devices demonstrate bias-tunable multi-color detection and capability of remote temperature sensing. The QD structures with bipolar doping are proposed to independently control photocarrier lifetime (photocurrent) and dark current. The bipolar doping allows us to increase the height of nanoscale potential barriers around QDs without changing the electron population in QDs, which determines dark current. The QD devices with bipolar doping demonstrate significant enhancement of photocurrent, while dark current is close to that in corresponding reference devices with unipolar doping.
关键词： quantum well,photovoltaic conversion,IR sensing,selective doping,quantum dot
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE Conference on Control Technology and Applications (CCTA) - Copenhagen (2018.8.21-2018.8.24)] 2018 IEEE Conference on Control Technology and Applications (CCTA) - Retrofitting Based Power System Stabilizer Design of PV-Integrated Power Systems
摘要： In this paper, we propose a novel type of Power System Stabilizer (PSS) for power systems with large-scale photovoltaic (PV) integration. The proposed PSS can mitigate adverse impacts of short-term operation stoppage of PV generators on the overall power system dynamics. The advantage of the proposed PSS over conventional PSSs is that the damping performance of the overall power system is shown to be improved theoretically while the proposed PSS can be considerably lower-dimensional than the entire power system. The efficiency of the proposed PSS is shown through a numerical example of a PV-integrated benchmark model representing the bulk power system in the eastern half of Japan.
关键词： Power System Dynamics,Photovoltaic,Retrofit Control,Power System Stabilizer
更新于2025-09-04 15:30:14