Exploiting Bursting Oscillations to Improve Energy Capture from Slowly Changing Excitation

2021 ◽  
Author(s):  
Wen-An Jiang ◽  
Xin-Dong Ma ◽  
Mao Liu ◽  
Yong Wang ◽  
Li-Qun Chen ◽  
...  
Keyword(s):  
Bursting Oscillations ◽  
Energy Capture

Maximum Peak Power Tracking-Based Control Algorithms with Stall Regulation for Optimal Wind Energy Capture

2008 ◽  
Vol 128 (4) ◽  
pp. 411-417 ◽  
Author(s):  
Bunlung Neammanee ◽  
Korawit Krajangpan ◽  
Somporn Sirisumrannukul ◽  
Somchai Chatratana
Keyword(s):  
Wind Energy ◽  
Peak Power ◽  
Control Algorithms ◽  
Energy Capture ◽  
Maximum Peak

Axially Nonadiabatic Channel Treatment of Low-Energy Capture in Ion-Rotating Diatom Collisions†

2004 ◽  
Vol 108 (41) ◽  
pp. 8703-8712 ◽  
Author(s):  
E. I. Dashevskaya ◽  
I. Litvin ◽  
E. E. Nikitin ◽  
I. Oref ◽  
J. Troe
Keyword(s):  
Low Energy ◽  
Energy Capture

Characterization of Power Optimizer Potential to Increase Energy Capture in Photovoltaic Systems Operating Under Nonuniform Conditions

2013 ◽  
Vol 28 (6) ◽  
pp. 2936-2945 ◽  
Author(s):  
Sara M. MacAlpine ◽  
Robert W. Erickson ◽  
Michael J. Brandemuehl
Keyword(s):  
Photovoltaic Systems ◽  
Energy Capture

Energy Capture from Thermolytic Solutions in Microbial Reverse-Electrodialysis Cells

Science ◽  
2012 ◽  
Vol 335 (6075) ◽  
pp. 1474-1477 ◽  
Author(s):  
R. D. Cusick ◽  
Y. Kim ◽  
B. E. Logan
Keyword(s):  
Reverse Electrodialysis ◽  
Energy Capture

Real-Time Optimization of Wind Farm Energy Capture With Delay Compensated Nested-Loop Extremum Seeking Control

2017 ◽  
Author(s):  
Zhongyou Wu ◽  
Yaoyu Li
Keyword(s):  
Wind Turbine ◽  
Real Time ◽  
Wind Farm ◽  
Optimization Techniques ◽  
Extremum Seeking ◽  
Extremum Seeking Control ◽  
Energy Capture ◽  
Time Optimization ◽  
Real Time Optimization ◽  
Nested Loop

Real-time optimization of wind farm energy capture for below rated wind speed is critical for reducing the levelized cost of energy (LCOE). Performance of model based control and optimization techniques can be significantly limited by the difficulty in obtaining accurate turbine and farm models in field operation, as well as the prohibitive cost for accurate wind measurements. The Nested-Loop Extremum Seeking Control (NLESC), recently proposed as a model free method has demonstrated its great potential in wind farm energy capture optimization. However, a major limitation of previous work is the slow convergence, for which a primary cause is the low dither frequencies used by upwind turbines, primarily due to wake propagation delay through the turbine array. In this study, NLESC is enhanced with the predictor based delay compensation proposed by Oliveira and Krstic [1], which allows the use of higher dither frequencies for upwind turbines. The convergence speed can thus be improved, increasing the energy capture consequently. Simulation study is performed for a cascaded three-turbine array using the SimWindFarm platform. Simulation results show the improved energy capture of the wind turbine array under smooth and turbulent wind conditions, even up to 10% turbulence intensity. The impact of the proposed optimization methods on the fatigue loads of wind turbine structures is also evaluated.

Bursting Oscillations and Experimental Verification of a Rucklidge System

2021 ◽  
Vol 31 (08) ◽  
pp. 2130023
Author(s):  
Zhijun Li ◽  
Siyuan Fang ◽  
Minglin Ma ◽  
Mengjiao Wang
Keyword(s):  
Electronic Devices ◽  
Pitchfork Bifurcation ◽  
Phase Portraits ◽  
Formation Mechanisms ◽  
Analysis Method ◽  
Good Qualitative Agreement ◽  
Bursting Oscillations ◽  
Real Time Measurement ◽  
Time Varying Parameter ◽  
Measurement Results

Bursting oscillations are ubiquitous in multi-time scale systems and have attracted widespread attention in recent years. However, research on experimental demonstration of the bursting oscillations induced by delayed bifurcation is very rarely reported. In this paper, a parametrically driven Rucklidge system is introduced and a distinct delayed behavior is observed when the time-varying parameter passes through the pitchfork bifurcation point. Different bursting patterns induced by such a delayed behavior are numerically investigated under different excitation amplitudes based on the fast–slow analysis method. Furthermore, in order to reproduce the bursting electronic signals and explore the underlying formation mechanisms experimentally, a real physical circuit of the parametrically driven Rucklidge system is developed by using off-the-shelf electronic devices. The real-time measurement results such as time series, phase portraits and transformed phase portraits are in good qualitative agreement with those obtained from the numerical computations. The experimental evidence to verify bursting oscillations induced by delayed pitchfork bifurcation is thus provided in this study.

scholarly journals Carotenoid-Chlorophyll Interactions in a Photosynthetic Antenna Protein: A Supramolecular QM/MM Approach

Molecules ◽  
2018 ◽  
Vol 23 (10) ◽  
pp. 2589 ◽  
Author(s):  
Matthew Guberman-Pfeffer ◽  
José Gascón
Keyword(s):  
Chlorophyll A ◽  
Protein A ◽  
Transition Dipole Moment ◽  
Protein Domain ◽  
Electronic Coupling ◽  
Stoichiometric Ratio ◽  
Wild Type ◽  
Transition Dipole ◽  
Energy Capture ◽  
Photosynthetic Antenna

Multichromophoric interactions control the initial events of energy capture and transfer in the light harvesting peridinin-chlorophyll a protein (PCP) from marine algae dinoflagellates. Due to the van der Waals association of the carotenoid peridinin (Per) with chlorophyll a in a unique 4:1 stoichiometric ratio, supramolecular quantum mechanical/molecular mechanical (QM/MM) calculations are essential to accurately describe structure, spectroscopy, and electronic coupling. We show that, by enabling inter-chromophore electronic coupling, substantial effects arise in the nature of the transition dipole moment and the absorption spectrum. We further hypothesize that inter-protein domain Per-Per interactions are not negligible, and are needed to explain the experimental reconstruction features of the spectrum in wild-type PCP.

scholarly journals Comparison of electrical collection topologies for multi-rotor wind turbines

2020 ◽  
Vol 5 (4) ◽  
pp. 1237-1252
Author(s):  
Paul Pirrie ◽  
David Campos-Gaona ◽  
Olimpo Anaya-Lara
Keyword(s):  
Wind Turbines ◽  
Cost Effective ◽  
Capital Cost ◽  
Lower Efficiency ◽  
Energy Capture ◽  
Electrical Systems ◽  
Component Type ◽  
Potential Benefits ◽  
Comparison Table ◽  
Almost All

Abstract. Multi-rotor wind turbines (MRWTs) have been suggested in the literature as a solution to achieving wind turbine systems with capacities greater than 10 MW. MRWTs utilize a large number of small rotors connected to one support structure instead of one large rotor with the aim of circumventing the square cube law. Potential benefits of MRWTs include cost and material savings, standardization of parts, increased control possibilities, and improved logistics for assembly and maintenance. Almost all previous work has focused on mechanical and aerodynamic feasibility, with almost no attention being paid to the electrical systems. In this research eight different topologies of the electrical collection network for MRWTs are analysed to assess which are the most economically and practically viable options. AC and DC collection networks are presented in radial, star, cluster and DC series topologies. Mass, capital cost and losses are estimated based on scaling relationships from the academic literature and up-to-date commercial data. The focus of this study is the assessment of the type of electrical collector topology, so component type and voltage level are kept consistent between topology designs in order to facilitate a fair comparison. Topologies are compared in terms of four main criteria: capital cost, cost effectiveness, total mass and reliability. A comparison table is presented to summarize the findings of the research in a convenient way. It is found that the most cost-effective solutions are the AC radial and AC star topologies, with the least cost-effective being the DC series–parallel and DC cluster topologies. This is due to the high cost of DC–DC converters and DC switchgear along with the lower efficiency of DC converters. Radial designs perform best in terms of efficiency and annual energy capture. DC systems achieve a slightly lower nacelle mass compared to their equivalent AC systems. DC topologies are generally found to be more expensive when compared to their AC counterparts due to the high cost of DC–DC converters and DC switchgear. Star topologies are considered to have the best reliability due to having no shared equipment. The most suitable collection topology for MRWTs is shown to be of the star type, in which each turbine is connected to the step-up transformer via its own cable.

scholarly journals Bio-Templating: An Emerging Synthetic Technique for Catalysts. A Review

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1364
Author(s):  
M. Carmen Herrera-Beurnio ◽  
Jesús Hidalgo-Carrillo ◽  
Francisco J. López-Tenllado ◽  
Juan Martin-Gómez ◽  
Rafael C. Estévez ◽  
...  
Keyword(s):  
Active Sites ◽  
Experimental Studies ◽  
Functional Materials ◽  
Inorganic Materials ◽  
Hierarchical Organization ◽  
Materials Synthesis ◽  
Energy Capture ◽  
Wide Range ◽  
Mineralization Processes ◽  
And Storage

In the last few years, researchers have focused their attention on the synthesis of new catalyst structures based on or inspired by nature. Biotemplating involves the transfer of biological structures to inorganic materials through artificial mineralization processes. This approach offers the main advantage of allowing morphological control of the product, as a template with the desired morphology can be pre-determined, as long as it is found in nature. This way, natural evolution through millions of years can provide us with new synthetic pathways to develop some novel functional materials with advantageous properties, such as sophistication, miniaturization, hybridization, hierarchical organization, resistance, and adaptability to the required need. The field of application of these materials is very wide, covering nanomedicine, energy capture and storage, sensors, biocompatible materials, adsorbents, and catalysis. In the latter case, bio-inspired materials can be applied as catalysts requiring different types of active sites (i.e., redox, acidic, basic sites, or a combination of them) to a wide range of processes, including conventional thermal catalysis, photocatalysis, or electrocatalysis, among others. This review aims to cover current experimental studies in the field of biotemplating materials synthesis and their characterization, focusing on their application in heterogeneous catalysis.

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